Power conversion device

Abstract

The inverter (10) comprises: a main body housing (1) which houses a main circuit substrate on which a main circuit terminal block is mounted and a control substrate on which a control terminal block is mounted, wherein the main circuit terminal block is wired with a high-voltage electric wire and the control terminal block is wired with a low-voltage electric wire; a wiring cover (2) which is detachably mounted on the main body housing (1) and covers the main circuit terminal block; and a front cover (5) which is detachably mounted on the wiring cover (2) and covers the control terminal block and is fixed to the main body housing (1) by a fastening component which requires a tool when being removed, the front cover (5) having a stopper (53) which is located on a track on which the wiring cover (2) moves when the wiring cover (2) is removed from the main body housing (1) when the front cover (5) is mounted on the wiring cover (2), and the wiring cover (2) and the main body housing (1) have a fitting structure in which a concave and convex fitting is fitted when the wiring cover (2) is mounted on the main body housing (1).

Description

Technical Field

[0001] The present invention relates to a power conversion device that performs electric energy conversion such as conversion from AC to DC, conversion from DC to AC, frequency conversion of AC, or power conversion of DC. Background Art

[0002] Power conversion devices such as inverters are wired with high-voltage wires for the main circuit and low-voltage wires for control. The high-voltage and low-voltage wires are routed to separate terminal blocks. A protective cover is attached to the power conversion device to prevent accidental contact with the high-voltage wires. As disclosed in Patent Document 1, the protective cover is secured with a fastener and cannot be removed without tools.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2011-109846 Summary of the Invention

[0004] The invention disclosed in Patent Document 1 covers both the high-voltage and low-voltage wiring sections with a single cover. Therefore, if the cover is removed to perform wiring work on the low-voltage wiring, the high-voltage wiring section is also exposed. Consequently, when performing wiring work on the low-voltage wiring, it is necessary to avoid touching the high-voltage wiring section, making low-voltage wiring work difficult.

[0005] If a cover covering only the low-voltage wiring section is provided in addition to the cover covering the high-voltage wiring section, wiring work on the low-voltage wiring section can be performed with only the cover covering the low-voltage wiring section removed, thereby preventing accidental contact with the high-voltage wiring section. However, when wiring or repairing both the high-voltage and low-voltage wiring sections, tools are required to remove the fastening components of both covers separately. In other words, when wiring or repairing both the high-voltage and low-voltage wiring sections, the fastening components must be removed twice using tools, which reduces the efficiency of wiring or repair work.

[0006] The present invention has been proposed in view of the above situation, and its purpose is to obtain a power conversion device that has a cover that covers only the wiring part of the low-voltage wire in addition to the cover that covers the wiring part of the high-voltage wire, so that the wiring part of the high-voltage wire and the wiring part of the low-voltage wire can be exposed by using a tool once.

[0007] To solve the above-mentioned problems and achieve the purpose, the present invention comprises: a main body housing that houses a first substrate having a first terminal block mounted thereon and a second substrate having a second terminal block mounted thereon, the first terminal block being wired with high-voltage electrical wires and the second terminal block being wired with low-voltage electrical wires; a first cover that is removably mounted to the main body housing and covers the first terminal block; and a second cover that is removably mounted to the first cover and covers only the second terminal block, the second terminal block being secured to the main body housing by a fastening member that requires a tool for removal. The second cover has a stopper that, when the second cover is mounted on the first cover, is located on a track along which the first cover moves when the first cover is removed from the main body housing. The first cover and the main body housing have a fitting structure in which the first cover engages with the second cover when the first cover is mounted on the main body housing.

[0008] Effects of the Invention

[0009] The power conversion device according to the present invention has a cover that covers only the wiring portion of the low-voltage wire in addition to the cover that covers the wiring portion of the high-voltage wire, thereby achieving the effect of being able to expose the wiring portion of the high-voltage wire and the wiring portion of the low-voltage wire by using a tool once. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a front view of the inverter according to the first embodiment of the present invention.

[0011] Figure 2 This is a side view of the inverter according to the first embodiment.

[0012] Figure 3 This is a cross-sectional view of the inverter according to the first embodiment.

[0013] Figure 4 It is a front view of the main body case of the inverter according to the first embodiment.

[0014] Figure 5 It is a cross-sectional view of a main body case of the inverter according to the first embodiment.

[0015] Figure 6 This is a plan view of a wiring cover of the inverter according to the first embodiment.

[0016] Figure 7 This is a side view of the wiring cover of the inverter according to the first embodiment.

[0017] Figure 8 This is a front view of the front cover of the inverter according to the first embodiment.

[0018] Figure 9 This is a cross-sectional view of the front cover of the inverter according to the first embodiment.

[0019] Figure 10It is a diagram showing a method of attaching the wiring cover of the inverter according to the first embodiment to the main body case.

[0020] Figure 11 It is an enlarged view of a fitting portion between a main body case and a wiring cover of the inverter according to the first embodiment.

[0021] Figure 12 It is a diagram showing a method of attaching the front cover of the inverter according to the first embodiment to the wiring cover.

[0022] Figure 13 This is an enlarged view of a fitting portion between a wiring cover and a front cover of the inverter according to the first embodiment.

[0023] Figure 14 This is a diagram showing a state in which a wiring cover and a front cover are fixed to a main body case of the inverter according to the first embodiment.

[0024] Figure 15 This is an enlarged view of a fitting portion between a wiring cover and a front cover of the inverter according to the first embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, a power conversion device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to this embodiment.

[0026] Implementation Method 1

[0027] Figure 1 It is a front view of the inverter according to the first embodiment of the present invention. Figure 2 This is a side view of the inverter according to the first embodiment. Figure 3 This is a cross-sectional view of the inverter according to the first embodiment. Figure 3 Shown along Figure 1The cross section is taken along the line III-III in FIG. The power conversion device, namely the inverter 10, has a main circuit substrate 3 as a first substrate and a control substrate 4 as a second substrate. A first terminal block, namely the main circuit terminal block 31, is mounted on the main circuit substrate 3. A second terminal block, namely the control terminal block 41, is mounted on the control substrate 4. In addition, the inverter 10 has: a main body case 1, which houses the main circuit substrate 3 and the control substrate 4; a first cover, namely the wiring cover 2, which is detachably mounted on the main body case 1 and covers the main circuit terminal block 31; and a second cover, namely the front cover 5, which is detachably mounted on the wiring cover 2 and covers only the control terminal block 41 of the main circuit terminal block 31 and the control terminal block 41, and is fixed to the main body case 1. The main body case 1 is in the shape of a box with openings formed on the front and bottom surfaces. The front surface refers to the surface of the inverter 10 that faces an operator who operates the inverter 10 or a worker who performs maintenance on the inverter 10. The bottom surface of the inverter 10 is the surface facing vertically downward when the inverter 10 is installed. The wiring cover 2 is attached to the bottom surface of the main body case 1. The front cover 5 is attached to the front of the main body case 1. The front cover 5 is fixed to the main body case 1 by screwing it to the main body case 1 using screws 6, which are fastening members that require tools for removal.

[0028] like Figure 2 As shown, a notch 11 and a hole 12 are formed on the side of the main body housing 1. A protrusion 21 and a protrusion 22 are provided on the wiring cover 2. Protrusion 21 engages with notch 11, and protrusion 22 fits into hole 12. Therefore, wiring cover 2 is fixed to the bottom surface of main body housing 1, and wiring cover 2 cannot be removed from main body housing 1 without releasing the engagement between protrusion 22 and hole 12. The engagement between protrusion 22 and hole 12 is a simple concave-convex engagement, so it can be released without the use of tools.

[0029] Figure 4 It is a front view of the main body case of the inverter according to the first embodiment. Figure 5 It is a cross-sectional view of a main body case of the inverter according to the first embodiment. Figure 5 Shown along Figure 4 The main body housing 1 is a rectangular box with a hollow interior. The main body housing 1 is formed with a notch 11 and a hole 12 for fitting with the wiring cover 2. The main body housing 1 is also provided with an internal thread 13 for screwing the front cover 5.

[0030] Figure 6 This is a plan view of a wiring cover of the inverter according to the first embodiment. Figure 7This is a side view of the wiring cover of the inverter involved in Embodiment 1. The wiring cover 2 has a protective plate portion 2a and side wall portions 2b extending vertically from both ends of the protective plate portion 2a. The protective plate portion 2a is provided with cutouts 25 and 26 for leading the high-voltage wires and low-voltage wires wired to the main circuit terminal block 31 and the control terminal block 41 to the outside of the main body shell 1. In addition, a partition 28 for separating the high-voltage wires from the low-voltage wires is provided on the upper surface of the portion between the cutout 25 and the cutout 26 in the protective plate portion 2a. In addition, the above-mentioned protrusions 21 and protrusions 22 for engaging with the main body shell 1 are provided on the side wall portion 2b. The protrusion 21 becomes Figure 5 The same shape as the cutout 11 of the main body case 1 is shown, and the wiring cover 2 is fitted into the cutout 11 by rotating it. In addition, the protective plate portion 2a is provided with a hole 23 for fitting with the front cover 5. In addition, a protrusion 24 is provided on the partition plate 28 so as to face the hole 23.

[0031] Figure 8 This is a front view of the front cover of the inverter according to the first embodiment. Figure 9 This is a cross-sectional view of the front cover of the inverter according to the first embodiment. Figure 9 Shown along Figure 8 The front cover 5 is formed with claws 51 for engaging with the wiring cover 2 and holes 52 for screwing to the main body housing 1 with screws 6. In addition, the front cover 5 is provided with a stopper 53 to prevent the wiring cover 2 from being removed without using tools.

[0032] Figure 10 It is a diagram showing a method of attaching the wiring cover of the inverter according to the first embodiment to the main body case. Figure 11 This is an enlarged view of the fitting portion between the main body case and the wiring cover of the inverter according to Embodiment 1. A high-voltage electric wire 32 is wired to the main circuit terminal block 31. A low-voltage electric wire 42 is wired to the control terminal block 41. When a high-voltage electric wire 32 is wired to the main circuit terminal block 31, the high-voltage electric wire 32 passes through the Figure 6 Similarly, when a low voltage electric wire 42 is wired to the control terminal block 41, the low voltage electric wire 42 passes through the cutout 25 shown in FIG. Figure 6The wiring cover 2 is connected to the main body housing 1 through the cutout 26 shown. After the high-voltage wire 32 and the low-voltage wire 42 are connected to the main body housing 1, the protrusion 21 of the wiring cover 2 is inserted into the cutout 11 of the main body housing 1. The wiring cover 2 is rotated along the cutout 11. The protrusion 22 of the wiring cover 2 then engages with the hole 12 of the main body housing 1. In this way, the wiring cover 2 and the main body housing 1 have a fitting structure in which the concave and convex parts fit together when the wiring cover 2 is attached to the main body housing 1. When the wiring cover 2 is attached to the main body housing 1, the hole 12 of the main body housing 1 and the protrusion 22 of the wiring cover 2 engage. As described above, the wiring cover 2 is attached to the main body housing 1.

[0033] Next, the front cover 5 is assembled to the wiring cover 2 . Figure 12 It is a diagram showing a method of attaching the front cover of the inverter according to the first embodiment to the wiring cover. Figure 13 This is an enlarged view of the mating portion between the wiring cover and the front cover of the inverter according to Embodiment 1. The front cover 5 is assembled to the wiring cover 2 by inserting claws 51 of the front cover 5 into holes 23 of the wiring cover 2 and rotating the front cover 5 about claws 51. Finally, screws 6 passing through holes 52 of the front cover 5 are tightened into the main body case 1 using a tool, thereby securing the wiring cover 2 and the front cover 5 to the main body case 1.

[0034] Figure 14 This is a diagram showing a state in which a wiring cover and a front cover are fixed to a main body case of the inverter according to the first embodiment. Figure 15 This is an enlarged view of the mating portion between the wiring cover and the front cover of the inverter according to Embodiment 1. With the front cover 5 screwed to the main body case 1, a stopper 53 of the front cover 5 is located on the track through which the protrusion 24 of the wiring cover 2 passes when removing the wiring cover 2 from the main body case 1. Therefore, as long as the front cover 5 is secured by the screws 6, the wiring cover 2 cannot be removed from the main body case 1.

[0035] When removing the wiring cover 2 from the main body housing 1 , the above-mentioned assembly operation flow is reversed.

[0036] In inverter 10 according to Embodiment 1, front cover 5 is screwed to main housing 1 by screws 6 and cannot be removed without tools. Meanwhile, wiring cover 2 is secured to main housing 1 solely by the engagement between protrusion 21 and notch 11, and between protrusion 22 and hole 12. Therefore, wiring cover 2 alone can be attached to and detached from main housing 1 without requiring tools to remove the fastening components. However, when front cover 5 is attached, stopper 53 of front cover 5 interferes with protrusion 24 of wiring cover 2, preventing wiring cover 2 from rotating. Consequently, while front cover 5 is secured to main housing 1 by screws 6, both front cover 5 and wiring cover 2 cannot be removed.

[0037] The inverter 10 according to the first embodiment allows the front cover 5 and the wiring cover 2 to be attached and detached by only a single operation requiring the removal of the screws 6 securing the front cover 5 to the main body housing 1. This allows efficient wiring and maintenance of the high-voltage and low-voltage wires 32 and 42. Furthermore, when it is not necessary to expose the wiring portion of the high-voltage wires 32, by removing only the front cover 5 while leaving the wiring cover 2 attached, it is possible to prevent accidental contact with the wiring portion of the high-voltage wires 32 when wiring or maintenance is being performed on only the low-voltage wires 42.

[0038] In the above description, the wiring cover 2 and the front cover 5 are attached and detached by rotating them, but they can also be attached and detached by sliding at least one of the wiring cover 2 and the front cover 5. When the front cover 5 is attached to the wiring cover 2, the stopper 53 is located on the track along which the wiring cover 2 slides. As a result, the wiring cover 2 cannot be removed from the main body case 1 while the front cover 5 is screwed to the main body case 1. This prevents the wiring cover 2 from being removed without using tools, thereby exposing the main circuit terminal block 31.

[0039] In the above embodiment, the mating structure between the wiring cover 2 and the main body housing 1 is such that the protrusion 22 of the wiring cover 2 fits into the hole 12 of the main body housing 1. However, a mating structure in which the protrusion 22 on the main body housing 1 side is convex and the wiring cover 2 side is concave can also be used. Furthermore, in the above embodiment, the main body housing 1 is a box-shaped structure with openings formed on the front and bottom surfaces. However, in the case of a main body housing 1 in which the first cover is attached to the bottom surface of the main body housing 1 and the second cover is attached to the front surface of the main body housing 1, the main body housing 1 can also be a box-shaped structure with openings formed in a location other than the front or bottom surface. Therefore, the mounting surfaces of the first and second covers are not limited to the front and bottom surfaces.

[0040] The configuration shown in the above embodiment is merely an example of the content of the present invention, and can be combined with other known technologies. Part of the configuration can also be omitted or modified without departing from the scope of the present invention.

[0041] Description of the label

[0042] 1 Main body case, 2 Wiring cover, 2a Protective plate, 2b Side wall, 3 Main circuit board, 4 Control board, 5 Front cover, 6 Screw, 10 Inverter, 11, 25, 26 Notches, 12, 23, 52 Holes, 13 Internal thread, 21, 22, 24 Protrusions, 28 Partition, 31 Main circuit terminal block, 32 High-voltage wires, 41 Control terminal block, 42 ​​Low-voltage wires, 51 Claw, 53 Stopper.

Claims

1. A power conversion device, characterized in that: have: a main body housing that houses a first terminal block for wiring high-voltage electric wires and a second terminal block for wiring low-voltage electric wires; a first cover detachably mounted on the main housing to cover the first terminal block; as well as a second cover detachably mounted on the first cover, covering only the second terminal block of the first and second terminal blocks, and fixed to the main housing by a fastening member requiring a tool for removal; The second cover has a stopper that is located on a track along which the first cover moves when the first cover is removed from the main body housing when the second cover is attached to the first cover. When only the second cover is removed while the first cover remains attached, the wiring portion of the high-voltage electric wire is not exposed.

2. The power conversion device according to claim 1, wherein: The first cover and the main body case have a fitting structure in which projections and recesses fit together when the first cover is attached to the main body case.

3. The power conversion device according to claim 1 or 2, characterized in that: The first cover has cutouts formed therein for respectively passing the high-voltage electric wire and the low-voltage electric wire.

4. The power conversion device according to claim 1 or 2, characterized in that: The main body shell is in the shape of a box with openings formed on the front and bottom surfaces. The first cover is mounted on the bottom surface of the main body housing. The second cover is attached to the front surface of the main body housing.

5. The power conversion device according to claim 3, wherein: The main body shell is in the shape of a box with openings formed on the front and bottom surfaces. The first cover is mounted on the bottom surface of the main body housing. The second cover is attached to the front surface of the main body housing.

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