JP7404961B2 - Wind tunnel structure and power converter - Google Patents

Description

The present invention relates to a wind tunnel structure of a power conversion device that serves to cool a power conversion unit.

When forcing a power converter unit of a power converter to be cooled with forced air, a wind tunnel structure is used to improve cooling efficiency. As a prior document of this wind tunnel structure, for example, the wind tunnel structure of Patent Document 1 seals the gap between the power conversion section unit and the wind tunnel section with packing, and provides cooling air to the cooling section housed in the wind tunnel section. to cool the power conversion unit. Further, in the wind tunnel structures of Patent Documents 2 and 3, a power converter unit is housed in the wind tunnel, and cooling air is circulated through a gap between the power converter unit and the wind tunnel.

Japanese Patent Application Publication No. 2005-057091 Japanese Patent Application Publication No. 2018-137852 Japanese Patent Application Publication No. 2016-19324

Although power converter units generally undergo maintenance such as periodic replacement, conventional wind tunnel structures have the following problems.

In the wind tunnel structure of Patent Document 1, the wind tunnel and the power converter unit interfere when the power converter unit is pulled out of the panel, so it is necessary to remove the constituent members of the wind tunnel, which increases the working time. In the wind tunnel structures of Patent Documents 2 and 3, the amount of leaked air increases and the cooling efficiency decreases.

An object of the present invention is to reduce leakage of cooling air used for cooling a power converter unit to increase cooling efficiency and to improve maintainability of the power converter unit.

Therefore, one aspect of the present invention has a wind tunnel structure, and includes a first wind tunnel section that can communicate airtightly with an exhaust duct of the power conversion section unit when the power conversion section unit is housed in a panel of the power conversion device. and a second wind tunnel section that is disposed at the exhaust port on the inner surface of the board and connected to the first wind tunnel section so as to ensure a gap between the exhaust duct and the first wind tunnel section.

In one aspect of the present invention, in the wind tunnel structure, one end of the first wind tunnel section is inserted into the second wind tunnel section and connected to the second wind tunnel section, and the first wind tunnel section is connected to the second wind tunnel section. A mounting hole for a fixing device for fixing the second wind tunnel section to the first wind tunnel section is formed in the second wind tunnel section, and this mounting hole forms a long hole along the direction of the insertion.

One aspect of the present invention is that, in the wind tunnel structure, an end of the first wind tunnel section facing the power converter unit includes a partition plate in which an opening into which the exhaust duct is inserted is formed, and a partition plate that has an opening into which the exhaust duct is inserted; A sealing member that can be brought into airtight contact with the sealing member receiver of the duct is provided.

In one aspect of the present invention, in the wind tunnel structure, the power converter unit is installed on a base part that is movable in and out of the panel.

One aspect of the present invention is the wind tunnel structure according to claim 3, wherein the partition plate is made of an insulating material.

In one aspect of the present invention, in the wind tunnel structure, the base portion is made of an insulating material.

In one aspect of the present invention, the first wind tunnel section and the second wind tunnel section are arranged perpendicularly or horizontally to a cooling air intake direction of the power converter unit.

One aspect of the present invention is a power conversion device having the above wind tunnel structure.

According to the present invention described above, leakage of the cooling air used for cooling the power converter unit is reduced, cooling efficiency is increased, and maintainability of the power converter unit is improved.

1 is a perspective view showing the inside of a panel of a power conversion device having a wind tunnel structure according to Embodiment 1, which is one aspect of the present invention. FIG. FIG. 3 is a perspective view of the wind tunnel structure. FIG. 3 is a perspective view showing the inside of a panel of a power conversion device having a wind tunnel structure according to a second embodiment, which is one aspect of the present invention. FIG. 3 is a front view of the wind tunnel structure illustrating the power conversion unit when it is housed. FIG. 6 is a front view of the similar structure, illustrating the operation of pulling out the power converter unit.

Embodiments of the present invention will be described below with reference to the drawings.

[Embodiment 1]
The wind tunnel structure 2 of the power converter 1 illustrated in FIG. 1 is configured on the inner surface 11 of the ceiling portion of the panel 10 in which the power converter unit 3 of the power converter 1 is housed.

The wind tunnel structure 2 of this embodiment is arranged perpendicularly to the intake direction of the cooling air of the power converter unit 3 (arrow a in the figure), and has a first wind tunnel section 21 and a second wind tunnel section 22.

The first wind tunnel section 21 can be airtightly communicated with the exhaust duct 31 of the power converter unit 3 when the power converter unit 3 of the power converter 1 is housed in the panel 10 of the power converter 1 . In particular, the first wind tunnel section 21 is connected to the second wind tunnel section 22 by inserting one end of the first wind tunnel section 21 into the second wind tunnel section 22 .

Further, as shown in FIGS. 4(a) and 4(b), the first wind tunnel part 21 is screwed with an adjustment screw 23 which is a fixing device for fixing the second wind tunnel part 22 to the first wind tunnel part 21. A fixing hole 24 is formed.

As shown in FIG. 1, the exhaust duct 31 discharges cooling air introduced from the intake port 34 and used to cool the inside of the power conversion unit 3 when the power conversion unit 3 is in operation. As shown in FIGS. 4 and 5, a packing receiver 32 is provided on the inner circumference of the exhaust side end of the exhaust duct 31. The packing receiver 32 is a sealing member receiver, and can come into liquid-tight contact with the packing 27, which is a sealing member on the first wind tunnel section 21 side, when the exhaust duct 31 and the first wind tunnel section 21 communicate with each other. ing.

Furthermore, as shown in FIG. 2, a partition plate 26 and a packing 27 are provided at the end of the first wind tunnel section 21 facing the power converter unit 3 inside the panel 10 in FIG.

The partition plate 26 is formed with an opening 28 through which cooling air after heat exchange discharged from the exhaust duct 31 is provided. The partition plate 26 is made of an insulating member, and ensures insulation between the power converter unit 3 and the wind tunnel structure 2.

The packing 27 is a sealing member disposed around the opening 28 of the partition plate 26, and serves as a sealing member receiver on the exhaust duct 31 side when the first wind tunnel section 21 and the exhaust duct 31 communicate with each other. It can come into airtight contact with the packing receiver 32.

The second wind tunnel section 22 is disposed at the exhaust port 12 of the board 10 and is connected to the first wind tunnel section 21 so that a gap between the exhaust duct 31 and the first wind tunnel section 21 can be secured.

Further, as shown in FIG. 2, the second wind tunnel section 22 is formed with a mounting hole 25 for an adjustment screw 23, which is a fixing device used for connection with the first wind tunnel section 21.

The attachment hole 25 is a long hole extending in the insertion direction of the first wind tunnel section 21 into the first wind tunnel section 21 . As a result, the sliding amount of the first wind tunnel section 21 in the second wind tunnel section 22 is defined within the longitudinal range of the attachment hole 25, and the fixing position of the first wind tunnel section 21 can be arbitrarily adjusted.

As shown in FIG. 1, the power converter unit 3 is installed on a base portion 30 provided with wheels 33, and is movable in and out of the panel 10. The base portion 30 is made of an insulating member similarly to the partition plate 26, and ensures insulation of the power converter unit 3 from the ground.

An example of the operation of the wind tunnel structure 2 of this embodiment will be described with reference to FIGS. 1, 4, and 5.

First, before the power converter unit 3 is introduced into the panel 10, the first wind tunnel section 21 in the panel 10 is changed to, for example, the second wind tunnel section by tightening the adjustment screw 23, as shown in FIG. 22 at one end side (exhaust port 12 side of panel 10). Next, as shown in FIG. 1, when the base portion 30 is moved into the board 10, the power converter unit 3 is placed into the board 10.

Next, as shown in FIG. 5, the exhaust duct 31 of the power converter unit 3 is arranged to face the opening 28 of the first wind tunnel section 21 on the inner surface 11 of the board 10. Next, loosen the adjustment screw 23 from the state shown in the figure, and insert the first wind tunnel so that the adjustment screw 23 is at the other end side (exhaust duct 31 side) of the attachment hole 25 of the second wind tunnel section 22, for example. The part 21 is slid toward the exhaust duct 31 as shown by the arrow d in FIG. At this time, as shown in the figure, the packing 27 of the first wind tunnel section 21 is in airtight contact with the packing receiver 32 of the exhaust duct 31.

Next, the first wind tunnel section 21 is fixed in the second wind tunnel section 22 by tightening the adjustment screw 23. At this time, as shown in FIG. 1, the exhaust duct 31 of the power converter unit 3 is in airtight communication with the first wind tunnel section 21 and the second wind tunnel section 22 within the panel 10.

When the power conversion device 1 is operated, cooling air is introduced into the power conversion unit 3 through the intake port 34 of the power conversion unit 3, as indicated by arrow a in the figure. The cooling air used to cool the power converter unit 3 flows through the exhaust duct 31, the first wind tunnel section 21, the second wind tunnel section 22, and the exhaust port of the panel 10, as indicated by arrow b in FIG. 12, it is discharged perpendicularly to the intake direction (arrow a in FIG. 1).

Furthermore, when maintaining the power converter unit 3, the adjustment screw 23 is first loosened in the state shown in FIG. Next, the first wind tunnel section 21 is inserted into the exhaust port 12 of the panel 10 as indicated by the arrow e in FIG. be slid to the side. At this time, the first wind tunnel section 21 is separated from the exhaust duct 31, as shown in FIG.

Thereafter, the first wind tunnel section 21 is fixed in the second wind tunnel section 22 by tightening the adjustment screw 23. Then, as shown by the arrow c in FIG. 1, when the base portion 30 is moved to the outside of the board 10, the power converter unit 3 is brought out of the board 10.

According to the above wind tunnel structure 2, when introducing the power converter unit 3 into the panel 10 or pulling it out from the panel 10, the adjustment screw 23 is loosened and the first wind tunnel section 21 is slid toward the exhaust port 12 side of the panel 10. This ensures a gap between the exhaust duct 31 and the first wind tunnel section 21.

Therefore, when the power converter unit 3 is introduced into or pulled out from the panel 10, interference between the power converter unit 3 and the wind tunnel section (first wind tunnel section 21) is eliminated. Therefore, the work time for pulling out and storing the power converter unit 3 with respect to the panel 10 can be reduced, and the components to be attached and detached can be easily managed, and the maintainability of the power conversion device 1 is improved.

Furthermore, when the power converter unit 3 is stored in the panel 10, the packing 27 on the first wind tunnel section 21 side and the packing receiver 32 on the power converter unit 3 side come into airtight contact, reducing the amount of leakage air. As a result, cooling efficiency can be improved.

Further, since the fixing position of the first wind tunnel section 21 to the second wind tunnel section 22 can be easily finely adjusted within the range of the attachment hole 25 using the adjustment screw 23, maintainability is improved.

Since the partition plate 26 and the base part 30 are made of an insulating material, insulation between the power conversion unit 3 and the wind tunnel structure 2 and insulation between the power conversion unit 3 and the earth are easily ensured, and electrical Protection, etc. can be achieved.

[Embodiment 2]
The wind tunnel structure 2 may be arranged horizontally on the panel 10 like the power converter 1 of the second embodiment illustrated in FIG. This corresponds to the specifications with 31. In this case, as shown in FIG. It is arranged horizontally to the wind intake direction (arrow a).

The power conversion unit 3 may be pulled out and stored in the panel 10 in the power conversion device 1 of the second embodiment in the same manner as in the first embodiment.

During operation of the power converter 1, cooling air is introduced into the power converter unit 3 through the intake port 34 of the power converter unit 3, as indicated by arrow a in the figure. The cooling air used to cool the power converter unit 3 flows in a horizontal direction with respect to the intake direction (arrow a), as shown by arrow b in the figure, and flows through the exhaust duct 31 and the first wind tunnel section 21. , is discharged through the second wind tunnel section 22 and the exhaust port 12 on the back side of the panel 10. During maintenance of the power converter unit 3, when the base part 30 is moved horizontally to the outside of the panel 10 as shown by arrow c in the same figure, the power converter unit 3 is moved to the outside of the panel 10. It will be pulled out.

According to the wind tunnel structure 2 of the second embodiment described above, it is clear that the same effects as those of the first embodiment can be obtained. In particular, even if it is difficult to work the adjustment screws 23 in the first embodiment, such as when the depth of the panel 10 of the power converter 1 is large, the flow direction of the cooling air can be adjusted as in the second embodiment. If the adjustment screw 23 is changed to the horizontal direction, the adjustment screw 23 can be easily handled from the power converter unit 3, the back side of the panel 10, etc.

DESCRIPTION OF SYMBOLS 1... Power conversion device 2... Wind tunnel structure, 21... First wind tunnel part, 22... Second wind tunnel part, 23... Adjustment screw, 24... Fixing hole, 25... Mounting hole, 26... Partition plate, 27... Packing, 28... Opening 3...Power converter unit, 30...Base part, 31...Exhaust duct, 32...Packing receiver, 33...Wheel, 34...Intake port 10...Panel, 11, 13...Inner surface, 12...Exhaust port a, b... Direction in which the cooling air flows c...Direction in which the power converter unit is pulled out d, e...Direction in which the first wind tunnel section slides

Claims (8)

a first wind tunnel portion capable of airtight communication with an exhaust duct of the power conversion unit when the power conversion unit is stored in a panel of the power conversion device;
a second wind tunnel section that is disposed at the exhaust port on the inner surface of the panel and is connected to the first wind tunnel section so as to be able to secure a gap between the exhaust duct and the first wind tunnel section;
has
The first wind tunnel section is connected to the second wind tunnel section by inserting one end of the first wind tunnel section into the second wind tunnel section,
A mounting hole for a fixing device for fixing the second wind tunnel part to the first wind tunnel part is formed in the second wind tunnel part,
This mounting hole should form a long hole along the direction of insertion.
A wind tunnel structure featuring a first wind tunnel portion capable of airtight communication with an exhaust duct of the power conversion unit when the power conversion unit is stored in a panel of the power conversion device;
a second wind tunnel section that is disposed at the exhaust port on the inner surface of the panel and is connected to the first wind tunnel section so as to be able to secure a gap between the exhaust duct and the first wind tunnel section;
has
At an end of the first wind tunnel section facing the power conversion section unit,
a partition plate formed with an opening into which the exhaust duct is inserted;
a sealing member that can make airtight contact with the sealing member receiver of the exhaust duct;
The wind tunnel structure described above is characterized in that it is equipped with . At an end of the first wind tunnel section facing the power conversion section unit,
a partition plate formed with an opening into which the exhaust duct is inserted;
The wind tunnel structure according to claim 1 , further comprising a sealing member that can be brought into airtight contact with the sealing member receiver of the exhaust duct. The wind tunnel structure according to any one of claims 1 to 3, wherein the power converter unit is installed on a base part that is movable in and out of the panel. The wind tunnel structure according to claim 2 or 3, wherein the partition plate is made of an insulating material. The wind tunnel structure according to claim 4, wherein the base portion is made of an insulating material. 7. The first wind tunnel section and the second wind tunnel section are arranged perpendicularly or horizontally to a cooling air intake direction of the power conversion unit. Wind tunnel structure described. A power conversion device having a wind tunnel structure according to any one of claims 1 to 7.

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