CN102386571B - Transformer cooling device - Google Patents

Abstract

The present invention provides a transformer cooling device capable of effectively cooling a transformer with a simple structure. The cooling device of the transformer of the present invention comprises: a frame body (1) for accommodating the transformer (2); in the frame body (1), the surrounding of the above-mentioned transformer (2) is divided into front and rear, and on the back side of the transformer (2) A partition plate (6) forming the wind tunnel part (7); opposite to the above wind tunnel part (7), and arranged on the upper surface of the above-mentioned frame body (1) with exhaust ceiling fans (8a, 8b); and The cooling air intake ports (4u-4w) formed only on the front of the frame (1) facing the winding portion of the transformer (2) are formed only from the cooling air intake ports (4u-4w). Pass through the winding part of the above-mentioned transformer (2), then pass through the above-mentioned wind tunnel part (7) to the cooling air passage of the above-mentioned top fan (8a, 8b) for exhausting.

Description

Transformer cooling device

technical field

The present invention relates to a transformer cooling device for cooling a transformer arranged in a housing.

Background technique

In the semiconductor power conversion device, the semiconductor unit that constitutes the main circuit, the part that cools heat-generating equipment such as the main circuit transformer, and the part that cools the control unit composed of electrical equipment that controls printed circuit boards with relatively poor heat resistance , respectively separated into three trays (frames) for storage. In particular, a tray (casing) housing a main circuit transformer with a large amount of heat generation adopts a forced ventilation method in which an air inlet is provided at least on the front side and exhaust is exhausted by a ceiling fan (for example, refer to Patent Document 1). In the conventional example described in this patent document 1, the exhaust fan is arranged on the top of the tray housing the transformer so as to face the transformer from above at the central portion in the front-rear direction, and an air intake port is provided in the front lower portion of the tray. In addition, an air guide duct combined with a blower fan is arranged on the back side of the bottom of the pan, and an opening is formed on the back side of the air guide duct toward the transformer, so that a part of the external air taken into the pan through the air inlet is drawn from the air duct. The air supply port of the air duct shunts and supplies air to the back of the transformer.

In addition, there is also known a transformer disk (for example, refer to Patent Document 2): a transformer-side insulating plate, a frame-side insulating support member, and an air-suction rectifying plate are provided, and the transformer-side insulating plate serves as a space partition inside the frame. The component divides the frame into an upper space and a lower space, and prevents the cooling air generated by the cooling fan from communicating with each other in the upper space and the lower space, and then guides the cooling air generated in the frame by the rotation of the cooling fan to surround the transformer coil The coil of the transformer is cooled in the cylindrical insulator on the outer periphery of the transformer.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2009-303354

[Patent Document 2] Japanese Unexamined Patent Publication No. 2009-76825

Here, in the conventional examples described in the above-mentioned Patent Document 1 and Patent Document 2, the forced exhaust method is adopted, that is, the air is taken in only from the front side of the frame housing the transformer, and the cooling air taken into the frame is exhausted. The air is exhausted to the outside by the cooling fan arranged above the transformer.

However, in the conventional examples described in the above-mentioned Patent Document 1 and Patent Document 2, in order to guide the cooling air taken in from the front of the housing to the surroundings of the transformer, it is necessary to have a blower fan, an air duct, and an outer periphery of the coil surrounding the transformer. There are unresolved problems such as complex structure and large-scale frame of the cylindrical insulating material in the upper part and the air guide mechanism that guides the cooling air to the lower part of the cylindrical insulating part.

Contents of the invention

Therefore, the present invention has been made while paying attention to the unsolved problems of the above conventional examples, and an object of the present invention is to provide a cooling device for a transformer capable of efficiently cooling a transformer with a simple structure.

In order to achieve the above object, a cooling device for a transformer according to an embodiment of the present invention is characterized in that it includes: a frame for accommodating the transformer; in the frame, the periphery of the transformer is divided into front and rear, and a cooling device is formed on the back side of the transformer. The partition plate of the wind tunnel part; the exhaust ceiling fan arranged on the upper surface of the above-mentioned frame body opposite to the above-mentioned wind tunnel part; The cooling air inlet is only formed with a cooling air passage from the cooling air inlet through the winding part of the above-mentioned transformer, through the above-mentioned wind tunnel part to the above-mentioned top fan for exhaust.

According to this structure, only the cooling air passage is formed from the cooling air inlet through the winding part of the above-mentioned transformer, and then through the wind tunnel part on the back side of the winding part to the above-mentioned exhaust fan, and can pass through the winding part of the transformer. The cooling air with high velocity can improve the cooling efficiency of the transformer.

In addition, the transformer cooling device according to another aspect of the present invention is characterized in that the partition plate includes an upper partition plate portion and a side partition plate portion, and the upper partition plate portion is arranged on the upper surface of the transformer. Between the upper surface of the frame and the upper surface of the frame, the side partition plate extends from both sides of the upper partition through the side of the transformer and extends to the rear side and the bottom face of the frame.

According to this structure, the surroundings of the transformer are covered by the upper partition board part and the side partition board part, and the wind tunnel part of the width corresponding to the width of the transformer can be formed, and the cooling air sucked in from the cooling air intake port passes only through the winding of the transformer. Department, can further improve the cooling efficiency of the transformer.

In addition, the transformer cooling device according to another aspect of the present invention is characterized in that the partition plate includes an upper partition plate portion and a side partition plate portion, and the upper partition plate portion is arranged on the upper surface of the transformer. Between the upper surface of the housing, the side partitions extend from both sides of the upper partition through the side of the transformer to the left side, right side and lower side of the housing.

According to this structure, the surroundings of the transformer are covered by the upper partition board part and the side partition board part, and the frame body can be partitioned into front and rear. cooling efficiency.

In addition, a cooling device for a transformer according to another aspect of the present invention is characterized in that the exhaust ceiling fan is arranged such that a central axis of the fan passes through the back side of the winding portion of the transformer.

According to this configuration, the cooling air that has passed through the winding portion of the transformer and reaches the rear side can be reliably discharged by the exhaust ceiling fan.

In addition, a cooling device for a transformer according to another aspect of the present invention is characterized in that a plurality of the exhaust ceiling fans are arranged side by side along the width direction.

According to this configuration, the cooling air passing through the winding of the transformer can be discharged by the plurality of exhaust ceiling fans, the volume of the cooling air can be increased, and the cooling efficiency of the transformer can be improved.

Effects of the present invention will be described below.

According to the present invention, a partition plate is provided around the transformer to form a wind tunnel on the back side of the transformer, and a ceiling fan for exhaust is arranged on the upper surface of the frame opposite to the wind tunnel, and only The cooling air intake port is provided on the front side opposite to the winding of the transformer. With the above simple structure, it is possible to form only the cooling air intake port passing through the winding part of the above-mentioned transformer, and then passing through the wind tunnel part to the above-mentioned exhaust roof. The cooling air channel of the fan can pass the cooling air with a high velocity through the winding part of the transformer, and has the effect of improving the cooling efficiency of the transformer.

Description of drawings

1 is a diagram showing a first embodiment of the present invention, wherein (a) is a front view, (b) is a front view after removing a front panel, and (c) is a cross-sectional view along line A-A of (a), (d) is a cross-sectional view on the line B-B of (a).

2 is a view showing a second embodiment of the present invention, wherein (a) is a front view, (b) is a front view after removing the front panel, and (c) is a cross-sectional view on line C-C of (a) .

Explanation of reference signs:

1-frame

1a - front panel

1b - rear panel

1c-upper panel

1d-bottom panel

1e - left panel

1f - right panel

2- Main circuit transformer

3-Open and close the door

4u～4w-cooling air inlet

6- Divider

6a-upper partition

6b～6e-Side partition part

7-Wind Tunnel Department

8a, 8b-top fan for exhaust

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, although various limitations are made to constituent elements, types, combinations, positions, shapes, numbers, and relative arrangements, these are merely examples. The invention is not limited to the following embodiments.

1( a ) to ( d ) are diagrams showing a first embodiment of the present invention. In the drawings, reference numeral 1 is a frame (disc), and the frame 1 is formed in a rectangular parallelepiped shape by a front panel 1a, a rear panel 1b, an upper panel 1c, a bottom panel 1d, a left panel 1e, and a right panel 1f. A three-phase main circuit transformer 2 is housed in a substantially central portion of the housing 1 in a state where the three-phase windings Lu, Lv, and Lw are lined up in the width direction. The main circuit transformer 2 is fixed to the bottom panel 1d of the housing 1 .

The front panel 1a of the frame body 1 is provided with three columns of opening and closing doors 3 in the upper and lower sections along the width direction, and the opening and closing doors 3 of the lower section are opposite to the lower side of the windings Lu, Lv and Lw of the main circuit transformer 2, Cooling air intake ports 4u, 4v, and 4w are formed. The cooling air intake ports 4u to 4w are each covered with a mesh member 5 .

In addition, a partition plate 6 is arranged between the upper part of the main circuit transformer 2 inside the housing 1 and the upper panel 1 c of the housing 1 . The partition plate 6 is formed into a U-shape surrounding the rear half of the main circuit transformer 2 by an upper partition plate portion 6a and side partition plate portions 6b and 6c connected thereto when viewed in plan.

The upper partition plate part 6a is arranged to extend along the width direction between the upper part of the main circuit transformer 2 and the upper panel 1c of the housing 1 in the middle position in the front-rear direction of the housing 1 . In addition, the side partition board parts 6b and 6c are arranged so as to extend from the left and right ends of the upper partition board part 6a toward the rear, parallel to the left and right side panels 1e and 1f to the rear panel 1b of the frame body 1, and extend to the frame body. The bottom panel 1d of 1 covers about half of the sides of the windings Lu and Lw of the main circuit transformer 2.

Furthermore, the wind tunnel part 7 is formed by the upper partition board part 6a of the partition board 6, side part partition board part 6b, 6c, and the back side of the main circuit transformer 2. As shown in FIG.

In addition, two ceiling fans 8a and 8b for exhaust are arranged at positions facing the wind tunnel portion 7 of the upper panel 1c of the housing 1 . The exhaust ceiling fans 8a, 8b are arranged on the upper panel 1c at a predetermined distance in the width direction so that the fan central axis Lf is slightly closer to the back side than the back side of the main circuit transformer 2.

Next, the operation of the first embodiment described above will be described.

The exhaust ceiling fans 8a, 8b are arranged above the wind tunnel portion 7 surrounded by the partition plate 6. Therefore, by rotating the exhaust ceiling fans 8a, 8b, the outside air is arranged in front of the frame body 1. The cooling air intake ports 4u to 4w of the panel 1a are taken into the housing 1 as cooling air.

The rear half of the main circuit transformer 2 is surrounded by an upper partition 6a and side partitions 6b and 6c of a partition 6, and a wind tunnel is formed by the partition 6 and the back side of the main circuit transformer 2. 7. And, the upper side of the wind tunnel part 7 is provided with the ceiling fans 8a, 8b for exhaust, therefore, the cooling wind sucked by the ceiling fans 8a, 8b for exhaust, as shown in Figure 1 (c) and (d), From the cooling air inlets 4u, 4v and 4w, through around the windings Lu, Lv and Lw of the main circuit transformer 2, enter the wind tunnel part 7, and form the cooling from the wind tunnel part 7 to the top fans 8a and 8b for exhaust. Air duct for forced air cooling (air cooling).

At this time, the air volume and wind speed of the cooling air sucked in from the cooling air inlets 4u-4w are approximately equal to the air volume and wind speed of the cooling air discharged from the exhaust ceiling fans 8a and 8b. The entire air volume of the cooling air sucked by 4u-4w passes around the windings Lu-Lw of the main circuit transformer 2, and is discharged to the outside by the exhaust ceiling fans 8a and 8b. Therefore, the air volume and wind speed of the cooling air passing around the windings Lu to Lw of the main circuit transformer 2 can be increased, the main circuit transformer 2 can be sufficiently cooled, and the cooling effect can be improved.

Furthermore, the structure for obtaining the above-mentioned effect is to provide the cooling air intake ports 4u to 4w on the front panel 1f of the housing 1 facing the main circuit transformer 2, and to arrange the rear half of the main circuit transformer 2. The partition plate 6 forms a wind tunnel 7 on the back side of the main circuit transformer 2, and the top fans 8a, 8b for exhaust are arranged on the upper side of the wind tunnel 7, and an effective cooling air passage can be formed with the above-mentioned simple structure. . Thereby, the main circuit transformer 2 can be set on the premise of forced air cooling, and size reduction can be achieved. In addition, since air is sucked only from the cooling air inlets 4u to 4w provided on the front side of the frame body 1, it is not necessary to provide inlet ports on the back side of the frame body 1, and it is not necessary to provide air inlets on the back side of the frame body 1. 1 (c) and (d), as shown in FIG. 1 (c) and (d), the back side of the frame body 1 can be placed in contact with a wall or the like.

Therefore, it is possible to reduce the size of the housing 1 housing the main circuit transformer 2 and reduce the installation space.

In addition, since the sides of the main circuit transformer 2 are surrounded by the side partitions 6b and 6c of the partition 6, the width of the wind tunnel 7 is approximately equal to the width of the main circuit transformer 2, and the width of the cooling air passage can be set. In order to be substantially constant, reduce the pipeline resistance of the cooling air, the cooling air can pass through in a laminar flow state, heat exchange can be performed in the main circuit transformer 2, and the cooling air with heat can be discharged well.

In the above-mentioned first embodiment, the case where the side partition plate portions 6b, 6c of the partition plate 6 are formed parallel to the left and right side panels 1e, 1f of the housing 1 has been described, but the present invention is not limited thereto. , when viewed from a plane (top view), it may extend obliquely from the upper partition plate portion 6a to the boundary position between the rear panel 1b of the frame body 1 and the left and right side panels 1e, 1f or its vicinity. In a word, the wind tunnel portion 7 is formed in The rear side of the main circuit transformer 2 is sufficient.

Next, a second embodiment of the present invention will be described with reference to FIG. 2 .

In this second embodiment, the shape of the partition plate 6 is changed.

That is, in the second embodiment, in the structure of FIG. 1 of the above-mentioned first embodiment, the side partition plate portions 6b and 6c of the partition plate 6 are omitted, as shown in FIGS. 2(b) and (c), Instead, side partition board parts 6d and 6e are formed at both ends of the upper partition board part 6a, and they reach the left and right side panels 1e and 1f of the frame body 1, and reach the bottom panel through the sides of the main circuit transformer 2. 1d has the same structure as that of FIG. 1 above except for this. Therefore, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

According to the second embodiment, the frame body 1 is partitioned front and rear by the upper partition plate portion 6a, the side partition plate portions 6d, 6e, and the main circuit transformer 2 of the partition plate 6, and the rear half becomes the wind tunnel portion 7. Therefore, as shown in FIG. 2(c), by rotationally driving the top fans 8a and 8b for exhausting, the cooling air inlets 4u-4w pass through the surroundings of the windings Lu-Lw of the main circuit transformer 2, and from the wind tunnel part. 7, the cooling air passages reaching the ceiling fans 8a and 8b for exhaust can obtain the same effects as those of the above-mentioned first embodiment. In this case, since the partition plate 6 can be formed in a flat plate shape from the upper partition plate portion 6 a and the side partition plate portions 6 d and 6 e, the structure of the partition plate 6 can be simplified.

In the above-mentioned first and second embodiments, the case where the three cooling air intake ports 4u to 4w are formed on the front side of the housing 1 has been described. One or two long (rectangular) cooling air inlets may be provided, or more than four cooling air inlets may be provided.

In the above-mentioned first and second embodiments, the case where the main circuit transformer is used as the transformer has been described, but the present invention is not limited thereto, and the present invention can be applied to cases where any transformer is housed in the casing 1 .

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-described embodiments. Various changes can be made within the scope of the technical idea of the present invention, and they all belong to the protection scope of the present invention.

Claims (2)

1. A cooling device for a transformer, comprising: A frame for accommodating the transformer; In the frame, the periphery of the transformer is divided into front and rear, and a partition plate forming a wind tunnel part on the back side of the transformer; a ceiling fan for exhaust, which is opposite to the wind tunnel and arranged on the upper surface of the frame; and a cooling air intake port formed only on the front of the housing at a position facing the winding portion of the transformer, And only the cooling air channel from the cooling air inlet through the winding part of the transformer, then through the wind tunnel part to the top fan for exhaust is formed, The top fan for exhaust is arranged such that the central axis of the fan passes through the back side of the winding part of the transformer, The partition plate includes an upper partition plate portion and a side partition plate portion, the upper partition plate portion is arranged between the upper surface of the transformer and the upper surface of the frame body, and the side partition plate portion The two sides of the upper partition plate pass through the side of the transformer and extend to the rear panel and the bottom panel of the frame. 2. The cooling device of the transformer according to claim 1, characterized in that: A plurality of exhaust ceiling fans are arranged side by side along the width direction.