JPH08223942A - Loading and unloading apparatus of life component for inverter - Google Patents

Abstract

PURPOSE: To obtain a loading and unloading apparatus which reduces the number of components disturbing the loading and unloading operation of a cooling fan and a smoothing capacitor. CONSTITUTION: An opening 13 is formed in the rear face plate 4 which communicates with cooling fans 11 and which comprises wind holes 4a, and a terminal stand 12 is faced. A space in which the rear surface of terminal stands 12a, 12b is attached to the upper part from the surface of the cooling fans 11 and in which the cooling fan 11 on the left side is removed is ensured. A fixing plate 21 which is bent to the edge of the rear surface plate 4 and a mounting plate for the cooling fans 11 are made freely detachable by a screw 23. A partition plate 16 is arranged between the rear of the terminal stands 12a, 12b and the front of the cooling fans 11 so as to be tightened together by the screw 23. The cooling fan 11 on the right side is made slidable along the rear surface plate 4. After a front plate 5 has been removed, external wires 15 are removed. Then the screw 23 is removed, the fixing plate 21, the mounting plate 22 and the partition plate 16 are separated. Then the partition plate 16 is pulled out, the cooling fan 11 on the left side can be removed from a box body 6. When the cooling fan 11 on the right side is slid along the rear surface plate 4, it can be removed from the box body 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching / detaching a life component such as a cooling fan for an inverter or a smoothing capacitor. In this specification, including the claims,
As for the installation of the inverter, the vertical wall of the installation includes an inverter that is upside down, left-right upside down, and the back plate is horizontal.

[0002]

2. Description of the Related Art FIG. 7 is a lower right front perspective view of a conventional cooling fan removal work, FIG. 8 is a lower right front perspective view of the smoothing capacitor removal work of FIG. 7, and FIG. It is a lower right front perspective view which expands. In the description of each drawing in this specification, those denoted by the same reference numerals have approximately the same function and may not be described. Further, in each drawing, the attaching / detaching operation is shown by a solid line, and the development for explanation is shown by a one-dot chain line.

In FIG. 9, a back plate 1 and left and right side plates 2 are shown.
a, 2b, the upper plate 3, the lower plate 61, and the removable front plate 5
The box body 62 is formed from the above. A main circuit device 7 in which a switching element, a rectifying circuit, etc. are attached to a cooling body in a box 62.
The printed circuit board 8 of the control circuit, the shield plate 63, the smoothing capacitor 10, the cooling fan 11, and the terminal block 64 are housed. Normally, the smoothing condenser 10 and the cooling fan 11 are
There are several in parallel. The main circuit device 7 is arranged between the shield plate 63 parallel to the rear plate 1 and the rear plate 1, and the printed circuit board 8 is attached to the front side of the shield plate 63. The lower surface plate 61 has the lower surface portion of the box body 62 provided with the rear side portion and the opening 13 is provided on the upper surface side, and the lower surface plate 61 is provided with air holes 61a to communicate with the cooling fan 11 that ventilates vertically. Box 6
Vent holes (not shown) are provided in the side plates 2a, 2b or the upper plate 3 on the upper side of the upper part 2. The rear side of the terminal block 64 looking into the opening 13 is located on the front side of the ventilation passage of the cooling fan 11 so as not to interfere with ventilation and cooling. The cooling fan 11 cools the main circuit device 7 and the like through a cooling body with cooling fins (not shown).

Then, in this conventional example shown in FIG.
The mounting structure of the cooling fan 11 and the smoothing capacitor 10, which are the life parts, will be described. First, the cooling fan relationship will be described. The horizontally long terminal block 64 in which a plurality of terminals are arranged has an opening 1
It is attached to the side plates 2a, 2b through the terminal block attachment plate 65 over the entire width of the left-right direction of the plate 3. Also, the terminal block 64
The lower surface of the cooling fan 11 is positioned substantially at the same level in the vertical direction with respect to the lower surface of the plurality of cooling fans 11 or the lower surface plate 61. This is for the purpose of effectively utilizing the internal volume of the box 62. The cooling fan 11 is mounted on the side plate 2 via the fan mounting case 66.
It is attached to a and 2b.

Next, the relationship between the smoothing capacitors will be described. The smoothing capacitor 10 is inserted into a hole of a capacitor mounting plate 67 fixed between the upper surface plate 3 and the lower surface plate 61 with screws or the like. The ears 69a of the band 69 for fastening the smoothing capacitor 10 with the screw 68 are screwed with the capacitor mounting plate 67.
Can be detachably attached to. Cooling fan 11 shown in FIG.
In the removal work of (1), first, the front plate 5 is removed and the outer wire 15 is removed. Next, the jammer terminal block 64 is removed from the box 62 together with the terminal block mounting plate 65. Then, the cooling fan 11 together with the fan mounting case 66 is attached to the side plates 2a and 2b.
Can be removed from the front side. If even one of the plurality of cooling fans 11 fails, all cooling fans 11
It is normal to completely replace all cooling fans 11, and it is desirable to completely replace all cooling fans 11 regularly even if there is no failure. In any case, in order to replace the cooling fan 11, which is a long-life component, an extra work of removing the disturbing terminal block 64 from the box 62 is necessary.

In the work of removing the smoothing capacitor 10 shown in FIG. 8, the front plate 5 is first removed. Next, the jammed printed circuit board 8 is removed together with the shield plate 63 from the box body 62. Then, if the screw 70 is removed, the smoothing capacitor 10 can be removed together with the band 69 from the capacitor mounting plate 67. One of the plurality of smoothing capacitors 10
It is common to replace the entire smoothing capacitor 10 completely if the stand also fails, and it is desirable to replace the entire smoothing capacitor 10 regularly even if there is no failure. In any case, in order to replace the smoothing capacitor 10 which is a life component, the extra work of removing the disturbing printed circuit board 8 from the box 62 is necessary.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to reduce the system down time of a circuit including an inverter by attaching / detaching other disturbing parts as much as possible in order to attach / detach a cooling fan or a smoothing capacitor, which are long-life parts. It is an object of the present invention to provide a device for attaching / detaching a life component of an inverter, which can shorten the operation time and the assembling time of the inverter.

[0008]

According to a first aspect of the present invention, there is provided a device for attaching / detaching a life part of an inverter, wherein a box body is formed from a back plate, left and right side plates, a top plate, a bottom plate and a removable front plate. The main circuit device, the printed circuit board, the shield plate, the smoothing capacitor, the cooling fan and the terminal block are housed in the main circuit device, and the main circuit device is arranged between the shield plate and the back plate parallel to the back plate, and the front surface of the shield plate is placed. The printed circuit board on the side of the box, the bottom plate occupies the back side of the bottom of the box and the opening on the top, and the bottom plate has air holes to communicate with the cooling fan that ventilates up and down. In the device for attaching / detaching the life parts of the inverter, in which the rear side of the terminal block that faces the opening is located in front of the ventilation path of the cooling fan, the bottom surface of the terminal block is located above the top surface of the cooling fan, which is the life part. Located in the cooling fan Those attached to the lower plate operably connecting unit from the outside of the box.

According to a second aspect of the present invention, in the first aspect, the attaching / detaching means includes a fixing plate that is bent downward from an edge of the lower surface plate on the front surface side, and a mounting plate that is in surface contact with the fixing plate and fixed to the front surface side of the cooling fan. It is composed of a screw for fastening the plate and the fixed plate. A third aspect of the present invention is the first or second aspect of the present invention, in which a plurality of cooling fans are arranged in parallel on the left and right, and a sub-terminal block is disposed on the front side of the remaining cooling fans except one or more cooling fans to front the one or more cooling fans. Secure a space for removal on the side, lower the height of the front side of the sub terminal block than the terminal block above it,
By removing the attaching / detaching means, the remaining cooling fan can be slid along the lower plate.

An inverter life attaching / detaching device according to a fourth aspect of the invention comprises a back plate, left and right side plates, an upper plate, a lower plate, and a removable front plate to form a box body, and a main circuit device and a main circuit device in the box body. The printed circuit board, shield plate, smoothing capacitor, cooling fan, and terminal block are stored, the main circuit device is placed between the shield plate and the rear plate parallel to the rear plate, and the printed circuit board is mounted on the front side of the shield plate. , The lower surface plate is provided with a rear side portion of the lower surface of the box body to provide an opening on the upper surface side, the lower surface plate is provided with an air hole to communicate with a cooling fan that ventilates up and down, and a ventilation port is provided at the upper part of the box body. In the device for attaching / detaching the life parts of the inverter, in which the back side of the terminal block looking into the opening is located in front of the ventilation path of the cooling fan, the smoothing capacitor, which is the life part, is placed on the side of the printed circuit board and the front of the shield plate. What to place A.

A fifth aspect of the present invention is the same as the fourth aspect, in which a plurality of smoothing capacitors are fixed in a case having a terminal opening.
The case is detachably attached to the shield plate or the box. A sixth aspect of the present invention is the case according to the fifth aspect, wherein the case has a case main body that has an L-shaped horizontal cross section in the left-right direction, has upper and lower side walls, and abuts against the bottom surface of the smoothing capacitor; It is composed of a pressing plate that presses the side surface and screws that attach both ends of the pressing plate to the side wall.

A seventh aspect of the present invention is the case of the fifth aspect, wherein the case has a case main body having upper and lower side walls and a U-shaped cross section parallel to the side plate, and the bottom side surface of the smoothing capacitor is pressed across both side walls. It is composed of a pressing plate and screws for attaching both ends of the pressing plate to the side walls. Invention 8 is such that, in Invention 6 or 7, a resin tape having a large friction coefficient is wound around the bottom side surface of the smoothing capacitor.

[0013]

According to the first aspect of the invention, since the lower surface of the terminal block is located above the upper surface of the cooling fan, the terminal block does not need to take out the cooling fan to the front side of the box. If the attaching / detaching means is removed, the cooling fan is immediately taken out to the front side of the box body. The reverse is true when installing the cooling fan, and the cooling fan can be immediately installed in the box. The same applies when there are multiple cooling fans.

According to the second aspect, the attaching / detaching means is simply constructed. According to the third aspect of the invention, the sub-terminal block is present on the front side of the residual cooling fan and the residual cooling fan cannot be taken out to the front side as it is. However, after sliding the residual cooling fan toward the space, the front side is removed. It can be taken out to the side. Further, since the height of the front side of the sub-terminal block is lower than that of the terminal block above the sub-terminal block, the external lines can be connected to the terminals without interfering with each other.

According to the invention 4, since the smoothing capacitor is arranged on the side surface side of the printed circuit board and on the front surface side of the shield plate, the smoothing capacitor can be immediately attached and removed without any obstacles by removing the front plate. . According to the fifth aspect of the present invention, the case containing the plurality of smoothing capacitors is detachably attached to the shield plate or the box, so that the plurality of smoothing capacitors can be attached / detached together only by attaching / detaching the case.

According to the sixth and seventh aspects of the invention, the case is composed of the case body, the pressing plate and the screw, and has a simple structure, and the smoothing capacitor is pressed and fixed by the case body and the pressing plate. According to this, the smoothing capacitor is pressed and fixed by the case main body and the pressing plate, and the resin tape having a large friction coefficient is more reliable. Therefore, it becomes easy to provide a gap between the plurality of smoothing capacitors, and the cooling of the smoothing capacitors is improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a lower right front perspective view of the cooling fan removal work of the first embodiment, FIG. 2 is a lower left front perspective view of the smoothing capacitor removal work of FIG. 1, and FIG. 4 is a lower left front perspective view, FIG. 4 is a lower left front perspective view of assembly of the smoothing capacitor and the case of the second embodiment, FIG. 5 is a lower left front perspective view of the smoothing capacitor removal work of FIG. 4, and FIG. It is a lower left front perspective view of the removal operation of the smoothing capacitor of Example 3.

As described above, in the description of each drawing of this specification, components having the same reference numerals have approximately the same function, and the description thereof may be omitted. Further, in each drawing, the attaching / detaching operation is shown by a solid line, and the development for explanation is shown by a one-dot chain line. First, a portion similar to the conventional example will be described. In FIG. 3, a box body 6 is formed from a rear plate 1, left and right side plates 2a and 2b, an upper plate 3, a lower plate 4, and a removable front plate 5. In the box body 6, the main circuit device 7, the printed circuit board 8, the shield plate 9, the smoothing capacitor 10, and the cooling fan 11 (see FIG.
And a terminal block 12 (as will be described later).
2a, consisting of a terminal block 12b and a sub-terminal block 12c). Normally, the smoothing condenser 10 and the cooling fan 11
And are plural in parallel. The main circuit device 7 is arranged between the shield plate 9 parallel to the rear plate 1 and the rear plate 1, and the printed circuit board 8 is attached to the front side of the shield plate 9. The lower surface plate 4 is provided with a rear side portion of the lower surface of the box body 6 to provide an opening 13 on the upper surface side, and the lower surface plate 4 is provided with an air hole 4a to communicate with a cooling fan 11 that ventilates vertically. Ventilation openings 14 are provided in the side plates 2a, 2b (or the top plate 3) on the top of the box body 6. The rear side of the terminal block 12 looking into the opening 13 is located on the front side of the ventilation passage of the cooling fan 11 so as not to interfere with ventilation and cooling. The cooling fan 11 cools the main circuit device 7 and the like through a cooling body with cooling fins (not shown). The cooling fan 11 normally ventilates the outside air into the box body 6, but may sometimes suck the outside air from the inside of the box body 6.

The features of the first embodiment will be described. In the first embodiment shown in FIG. 3, the mounting structure of the cooling fan 11 and the smoothing capacitor 10, which are the life parts, will be described. First, the cooling fan relationship will be described. The terminal block 12 includes a terminal block 12a on the left side and a terminal block 12b on the right side in which a plurality of terminals are arranged.
And a sub terminal block 12c on the lower side. The lower surface of the terminal block 12a and the terminal block 12b is provided with a cooling fan 11 which is a life component.
It is positioned above the upper surface (shown in FIG. 1) with a gap larger than the manufacturing and assembly error. The terminal block 12a and the terminal block 12b are fixed to the box body 6 with a metal fitting 20 or the like. The cooling fan 11 is attached to the lower surface plate 4 by a detachable means operable from the outside of the box body 6. As shown in FIG. 1, the attachment / detachment means includes a fixed plate 21 that is bent downward from an edge of the lower surface plate 4 on the front surface side, and a mounting plate that is in surface contact with the fixed plate 21 and fixed to the front surface side of the cooling fan 11. 22 (shown in FIG. 1) and a screw 23 for fastening the mounting plate 22 and the fixed plate 21. The lower surface of the terminal blocks 12a and 12b and the cooling fan 1 described above.
A gap larger than the error from the upper surface of 1 is preferably small in order to increase the internal volume of the box body 6, but when the gap is large and the leakage of cooling air cannot be ignored due to circumstances, the rear side of the terminal blocks 12a, 12b. The partition plate 16 may be arranged between the cooling fan 11 and the front side of the cooling fan 11. The partition plate 16 is fastened to the fixed plate 21 with screws 23 together with the mounting plate 22. A plurality of (two in this case) cooling fans 11 are arranged side by side. 1 or more by arranging the sub-terminal block 12c on the front side of the remaining cooling fan 11 (in this case, the right side) except for the one cooling fan 11 on the left side (in the case of 3 or more in total, the number may be 2 or more) A space for removing the cooling fan 11 is secured on the front side. The height of the front side of the sub terminal block 12c is made lower than that of the terminal block 12b above it. By removing the attaching / detaching means, the remaining cooling fan 11 can be slid along the lower surface plate 4. In addition to the above, the attachment / detachment means is, for example, a conventional one in which the fixing plate 21 is not provided and the mounting plate is bent rearward along the lower surface plate 4, and the mounting plate and the lower surface plate 4 are provided with irregularities that are elastically fitted to each other. There are many ways of. If the mounting plate 22 is provided with a handle 22a that is bent toward the back side, the cooling fan 11 can be easily slid and taken out.
When the cooling fan 11 is mounted, it is preferable to provide a receiving port or the like for receiving the rear surface portion of the cooling fan 11 on the rear surface side of the box body 6. Terminal block 12a, terminal block 12b and sub-terminal block 12c
It is good to mold with.

Next, the smoothing capacitor relationship will be described. The smoothing capacitor 10 as a life component is arranged on the side surface side of the printed board 8 and on the front surface side of the shield plate 9. A plurality of smoothing capacitors 10 are fixed in a case 30 whose terminals are open, and the case 30 is attached to the shield plate 9 (the box 6
It may be directly or indirectly attached to) with a screw 30a. The case 30 has an L-shaped horizontal cross section in the left-right direction, and has side walls 31a on the upper side and the lower side.
The case main body 31 is in contact with the bottom surface of 0, the pressing plate 32 that presses the bottom side surface of the smoothing capacitor 10 across both side walls 31a, and the screws 33 that attach both ends of the pressing plate 32 to the side wall 31a. When the smoothing capacitor 10 may affect the printed circuit board 8 by electromagnetic noise, a sub shield plate may be placed between the two.

In the work of removing the cooling fan 11 shown in FIG. 1, the front plate 5 is first removed, and then four for the two cooling fans 11 (three cooling fans 11 even when the number of the cooling fans 11 is two). The outer wire 15) may be removed from the terminal block 12a. Next, the screw 23 in the attaching / detaching means is removed. If there is a partition plate 16, remove it [(16) to 16
What〕. Then, the fixed plate 21 and the mounting plate 22 can be separated, and the left cooling fan 11 can be immediately removed from the box body 6 toward the front side. The cooling fan 11 on the right side, which has the auxiliary terminal block 12c and cannot be immediately removed from the front side
Also, if it is slid along the lower surface plate 4, it can be removed from the box body 6 toward the front surface side.

In the operation of removing the smoothing capacitor 10 shown in FIG. 2, first, the front plate 5 is removed, the bus bar (not shown) of the smoothing capacitor 10 is removed, and the screw 30a of the case 30 is removed. Then, since the smoothing capacitor 10 is on the front side of the seed plate 9 and has no obstacles, the smoothing capacitor 10 can be immediately removed together with the case 30 from the box body 6 toward the front side. Smoothing capacitor 10
Can be attached and detached together with the case 30, and the pressing plate 32 can be detached by removing the screw 33, and the smoothing capacitors 10 can be attached and detached to the case 30. Since the smoothing capacitor 10 is pressed and fixed by the pressing plate 32, the smoothing capacitor 10 can be pushed in and pulled out to be attached and detached without removing the screw 33.

FIG. 4 is a lower left front perspective view of the assembly of the smoothing capacitor and the case of the second embodiment, and FIG. 5 is a lower left front perspective view of the smoothing capacitor removal work of FIG. A plurality of smoothing capacitors 10 are fixed in a case 40 having an open terminal, and the case 40 is detachably attached to the shield plate 9 (which may be directly or indirectly attached to the box body 6) with screws as in FIG. . The case 40 includes a case body 41 having side walls 31a at upper and lower sides and a U-shaped cross section parallel to the side plate 2b of FIG. 2, and the smoothing capacitor 1 straddling both side walls 31a.
Pressing plate 32 that presses the bottom side surface of 0, and pressing plate 32
And a screw 33 for attaching both ends of the to the side wall 31a. The case body 31 of FIG. 2 has a portion (not shown and not shown) with which the bottom surface of the smoothing capacitor 10 abuts, whereas the case body 41 of FIGS. 4 and 5 does not have a portion with which the bottom surface of the smoothing capacitor 10 abuts. In addition, in FIG. 4 and FIG.
A resin tape 42 having a large friction coefficient is wound around the bottom side surface of the smoothing capacitor 10. The tape 42 is preferably rubber or synthetic resin, and may be an annular elastic band.

The work for removing the smoothing capacitors shown in FIGS. 4 and 5 is the same as that in the first embodiment. The smoothing capacitor 10 is pressed and fixed by the case body 41 and the pressing plate 32, which is further ensured by the resin tape 42 having a large friction coefficient. Therefore, it becomes easy to provide the gap C between the plurality of smoothing capacitors. FIG. 6 shows Example 3.
FIG. 7 is a lower left front perspective view of the smoothing capacitor removal work of FIG.
The ear 45a of the band 45 similar to the conventional example for tightening the smoothing capacitor 10 is attached to the case 47 with the screw 46. Similar to FIG. 2, the case 47 is detachably attached to the shield plate 9 (which may be directly or indirectly to the box body 6) by screws. It is one embodiment of invention 4.

[0025]

According to the device for attaching / detaching the life parts of the inverter of the invention 1, the cooling fan can be immediately attached / detached from the box body by removing the attachment / detachment means. Since there is less attachment and detachment of various parts, the system down time of the circuit including the inverter can be shortened, and the assembling time of the inverter can be shortened.

According to the second aspect of the invention, there is an effect that the attaching / detaching means is simply configured. According to the invention 3, since the remaining cooling fan is slid toward the space and can be taken out to the front side, the sub-terminal block can be arranged below the terminal block, and the width of the box body can be narrowed. There is. According to the apparatus for attaching / detaching the life parts of the inverter of the invention 4, the smoothing capacitor can be immediately attached / detached by removing the front plate.

According to the fifth aspect of the present invention, since the smoothing capacitor made up of a plurality of parts is housed in the case, there is an effect that a plurality of smoothing capacitors can be attached and detached together by simply attaching and detaching the case. According to the sixth aspect and the seventh aspect, the case includes the case main body, the pressing plate, and the screw, and has a simple structure, and the smoothing capacitor is pressed by the case main body and the pressing plate to be fixed.

According to the eighth aspect of the present invention, the smoothing capacitor is pressed and fixed by the case body and the pressing plate, which is further ensured by the resin tape having a large friction coefficient. Therefore, it becomes easy to provide a gap between the plurality of smoothing capacitors, and there is an effect that cooling of the smoothing capacitor is improved.

[Brief description of drawings]

FIG. 1 is a lower right front perspective view of a cooling fan removing operation according to a first embodiment.

FIG. 2 is a lower left front perspective view of the removal work of the smoothing capacitor of FIG.

FIG. 3 is a front lower left perspective view showing a part of FIG.

FIG. 4 is a lower left front perspective view of the smoothing capacitor of Example 2 and a case assembled together.

5 is a lower left front perspective view of the removal work of the smoothing capacitor of FIG. 4;

FIG. 6 is a lower left front perspective view of the smoothing capacitor removing operation of the third embodiment.

FIG. 7 is a lower right front perspective view of the conventional cooling fan removal work.

8 is a lower right front perspective view of the removal work of the smoothing capacitor of FIG. 7. FIG.

FIG. 9 is a front lower right perspective view showing a part of FIG.

[Explanation of symbols]

1 Back Plate 2a, 2b Side Plate 3 Top Plate 4 Bottom Plate 5 Front Plate 6 Box 7 Main Circuit Device 8 Printed Circuit Board 9 Shield Plate 10 Smoothing Capacitor 11 Cooling Fan 12 Terminal Block 12a, 12b Terminal Block 12c Sub Terminal Block 13 Opening 14 Ventilation Port 15 External Wire 16 Partition Plate 20 Metal Fitting 21 Fixing Plate 22 Mounting Plate 22a Grip 23 Screw 30 Case 30a Screw 31 Case Body 32 Holding Plate 33 Screw 40 Case 41 Case Body 42 Tape 45 Band 45a Ear 46 Screw 47 Case C Gap

Claims (8)

[Claims] 1. A box body is formed from a back plate, left and right side plates, a top plate, a bottom plate, and a removable front plate, and a main circuit device, a printed circuit board, a shield plate, a smoothing capacitor, and a cooling unit are provided in the box body. The fan and terminal block are stored, the main circuit device is placed between the shield plate and the back plate that are parallel to the back plate, the printed circuit board is attached to the front side of the shield plate, and the bottom plate is the back of the bottom of the box. Side part is occupied to have an opening on the upper surface side, an air hole is provided on the lower surface plate to communicate with a cooling fan that ventilates up and down, and a ventilation port is provided on the top of the box to cool the rear side of the terminal block looking into the opening In the device for attaching / detaching the life parts of the inverter, which is located in front of the ventilation path of the fan, the bottom surface of the terminal block is located above the top surface of the cooling fan, which is the life part, so that the cooling fan can be operated from the outside of the box. Attaching to the bottom plate by means Unloading device lifetime component of the inverter, characterized. 2. An inverter life component attaching / detaching device according to claim 1, wherein the attaching / detaching means is a fixing plate bent downward from an edge of the lower surface plate on the front surface side, and a front surface side of the cooling fan which is in surface contact with the fixing plate. An attachment / detachment device for a life part of an inverter, comprising: a mounting plate fixed to the base plate; and a screw for fastening the mounting plate and the fixed plate. 3. An inverter life component attaching / detaching device according to claim 1 or 2, wherein a plurality of cooling fans are arranged in parallel on the left and right, and a sub-terminal is provided on the front side of the remaining cooling fans except one or more cooling fans. A space is provided to dispose one or more cooling fans on the front side by arranging a base, the front side height of the sub-terminal block is made lower than the terminal block above it, and the remaining cooling fan is removed by removing the attaching / detaching means. A device for attaching / detaching a life component of an inverter, wherein the device can be slid along the bottom plate. 4. A box body is formed from a back plate, left and right side plates, a top plate, a bottom plate, and a removable front plate, and a main circuit device, a printed circuit board, a shield plate, a smoothing capacitor, and a cooling unit are provided in the box body. The fan and terminal block are stored, the main circuit device is placed between the shield plate and the back plate that are parallel to the back plate, the printed circuit board is attached to the front side of the shield plate, and the bottom plate is the back of the bottom of the box. Side part is occupied to have an opening on the upper surface side, an air hole is provided on the lower surface plate to communicate with a cooling fan that ventilates up and down, and a ventilation port is provided on the top of the box to cool the rear side of the terminal block looking into the opening The life of an inverter characterized by placing a smoothing capacitor, which is a life component, on the side of the printed circuit board and on the front side of the shield plate in the device for attaching and detaching the life component of the inverter, which is located in front of the ventilation passage of the fan. Attaching and detaching parts . 5. An inverter life component attaching / detaching device according to claim 4, wherein a plurality of smoothing capacitors are fixed in a case having terminal portions opened, and the case is detachably attached to a shield plate or a box. A device for attaching and detaching the life parts of the inverter. 6. An inverter life component attaching / detaching device according to claim 5, wherein the case has an L-shaped horizontal cross section in the left-right direction, and has side walls above and below to contact the bottom surface of the smoothing capacitor. An apparatus for attaching and detaching a life component of an inverter, comprising: a main body, a pressing plate that presses the bottom side surface of the smoothing capacitor across both side walls, and screws that attach both ends of the pressing plate to the side walls. 7. An apparatus for attaching and detaching a life part of an inverter according to claim 5, wherein the case has a case body having upper and lower side walls and a U-shaped cross section parallel to the side plate, and both side walls. An apparatus for attaching / detaching a life component of an inverter, comprising a holding plate for pressing the bottom side surface of the smoothing capacitor, and screws for attaching both ends of the pressing plate to the side walls. 8. An apparatus for attaching / detaching a life component of an inverter according to claim 6 or 7, wherein a resin tape having a large friction coefficient is wound around a bottom side surface of the smoothing capacitor.