JPH06349648A - Air-cooled mold transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] To secure an appropriate flow of cooling air for cooling windings and iron cores without using costly and time-consuming three-dimensional flow analysis. [Composition] An air hole 81 is provided on the upper surface of the wind tunnel 8. The cooling air blown into the wind tunnel 8 by the cooling fan 7 attached to the side surface of the wind tunnel 8 blows upward from the air hole 81 and passes through the winding 2 and the inner winding 22 and the iron core 1. To cool them. A partition plate 82 is provided so as to block a part of the air hole 81. Since the partition plate 82 is attached so that its position can be changed in the left and right directions in the drawing,
The size of the air hole 81 can be changed by changing the position of the partition plate 82, and the position of the air hole 81 can be moved equivalently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-cooled mold transformer provided with a cooling fan, and more particularly to a cooling structure thereof.

[0002]

2. Description of the Related Art Molded transformers are widely used for power receiving transformers in buildings because they have many advantages such as flame retardancy, compactness and low noise. Generally, the cooling of the mold transformer is mostly by natural cooling in which air circulates naturally, but when the capacity is large, so-called air cooling, in which cooling air is forcibly sent to the winding or the iron core in order to improve the cooling effect. Molded transformers may be used.

FIG. 8 is a side view of a conventional air-cooled mold transformer, and FIG. 9 is an enlarged sectional view of a portion E in FIG. Note that the elevation view of the air-cooled mold transformer is similar to FIG. 1 described later, so refer to FIG. 1 as necessary. In these figures,
The air-cooled mold transformer comprises an iron core 1, a winding 2 composed of an outer winding 21 and an inner winding 22, upper and lower frames 4 and 5 for mechanically connecting them, and a support base 6 for supporting them as a whole. At the bottom of the mold transformer body, a cooling fan 1
1 is provided and cooling air as shown by the arrow in FIG. 9 is sent to the winding 2 and the iron core 1 to generate cooling air having a higher flow velocity than natural cooling to improve the cooling effect. As shown in FIG. 1, an iron core 1 is a three-phase tripod iron core, and windings 2 are housed in three iron core legs, respectively. Since the lower members 8 and 9 are related to the present invention, the description thereof is omitted here. In an actual molded transformer, a spacing piece or the like is provided between the frames 4 and 5 and the winding wire 2 to mechanically integrate them, and a lead wire drawn from each winding wire or the like. Although they are also routed, they are not shown because they are not directly related to the present invention.

As shown in FIGS. 8 and 9, the cooling fan 11 is mounted at an angle so that the cooling air is sent toward the lower part of the winding 2 and the iron core 1 near the winding 2, and the cooling air is taken in from the outside for a while. It is configured to send the wind upward to the right.

[0005]

In FIG. 9, a cooling fan 1 is provided.
There is a problem that the cooling effect is poor because the air leaking from 1 to the wide space on the left side does not contribute to cooling. A wind tunnel may be provided below the wind-cooled mold transformer so that the cooling air can be effectively used. However, even in this case, an effective cooling effect may not be obtained depending on the shape of the wind tunnel. The reason is that it is difficult to accurately grasp the flow of the wind, so the cooling air does not flow as originally expected and the flow is biased, and some parts have poor cooling effect. This is because problems such as being lost will occur.

As is well known, recently, the technique of computer-aided flow analysis has been improved, but it is practical to analyze the flow of a three-dimensional structure with sufficient accuracy for practical use and also in consideration of economical efficiency. Has the problem of difficulty. An object of the present invention is to solve the above problems, to secure an appropriate flow of cooling air without performing a costly and time-consuming three-dimensional flow analysis, and to obtain a good cooling effect. To provide a mold transformer.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a wind tunnel for covering the lower part of the mold transformer is provided, at least one cooling fan is attached to the side surface thereof, and the upper surface thereof is provided. In an air-cooled mold transformer provided with air holes, an adjustment plate for adjusting the flow rate or direction of the cooling air sent out from the air holes shall be attached to the wind tunnel in a variable position, and the adjustment plate shall be It shall be a partition plate that reduces the area, or the adjustment plate,
It shall be a guide plate attached to the outer diameter side of the outer winding of the molded transformer with a predetermined gap maintained, and both the partition plate and guide plate shall be attached to the wind tunnel. Also, it is assumed that the adjustment plate is provided with an elongated hole elongated in the position variable direction, and the adjustment plate is fixed to the wind tunnel by a bolt passing through the elongated hole.

[0008]

In the structure of the present invention, the position of the adjusting plate for adjusting the flow rate or the direction of the cooling air sent from the air hole is variably attached to the wind tunnel, so that the winding of the cooling air sent out from the air hole through the air hole is wound. It is possible to adjust the distribution amount to the iron core and the distribution amount for each phase. At that time, since the position of the adjusting plate is variably attached to the wind tunnel, it is possible to actually send out the cooling air and adjust the cooling effect to be optimum.

Further, by constructing the adjusting plate by a partition plate attached so as to reduce the area of the air holes, the flow rate between each phase can be adjusted, and the winding and the iron core corresponding to the mounting position of the partition plate can be adjusted. It is possible to adjust the flow rate to the. Alternatively, by forming the adjusting plate with a guide plate attached to the outer diameter side of the outer winding with a predetermined gap, it is possible to reduce the cooling air that leaks to the outer side of the outer winding and does not contribute to the cooling effect. It is possible to improve the cooling effect by creating cooling air that rises along the outer diameter side of the outer winding.

Further, by attaching both the partition plate and the guide plate to the wind tunnel, both actions can be performed at the same time. Further, the adjustment plate is provided with a long hole in the direction of changing the position, and the position can be easily adjusted by fixing the long hole in the wind tunnel with a bolt penetrating the long hole.

[0011]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is an elevation view of a wind-cooled mold transformer showing an embodiment of the present invention, FIG. 2 is a side view of the same, and the same members as those in FIG. 8 are designated by common reference numerals and detailed description thereof will be omitted. In these drawings, a wind tunnel 8 is provided below the winding 2 of the air-cooled mold transformer, which covers the lower yoke without reference numerals and the lower frame 5 hidden in these drawings. This wind tunnel 8
A total of 10 cooling fans 11 are provided on the side surface of the.
A partition plate 9 described later is provided on the upper surface of the wind tunnel 8.

FIG. 3 is an enlarged cross-sectional view of the portion A of FIG. 2, and FIG. 4 is a view taken in the direction of arrow P of FIG. FIG. 3 is also a sectional view taken along line BB of FIG. Further, FIG. 5 is a perspective view of only the wind tunnel. In these drawings, a trapezoidally cut air hole 81 is formed on the upper surface of the wind tunnel 8, and a mounting hole 86 for mounting the cooling fan 7 is provided on the side surface. As is clear from FIG. 3, the cooling air blown into the wind tunnel 8 by the cooling fan 7 is blown upward from the air hole 81 toward the upper right side and passes through the winding 2 and the inner winding 22 and the iron core 1. To cool them. A part of the cooling air also flows on the outer diameter side of the outer winding 21, but the cooling effect is small because it diffuses toward the left side of the drawing.

A partition plate 82 is attached to the wind tunnel 8 so as to block a part of the air hole 81. This partition plate 82 has an elongated hole 83
It is fixed to the wind tunnel 8 by a bolt (not shown) passing therethrough, and the position of the bolt can be changed by the length of the long hole 83. Therefore, by changing the position of the partition plate 82 by the variable dimension, the wind hole can be changed. The size of 81 can be changed, and the position of the air hole 81 is equivalent to moving in the left-right direction in FIG. Therefore, in order to enhance the cooling effect of the inner winding 22 and the iron core 1, the partition plate 82 is fixed to the right side in FIG. 3, and in order to enhance the cooling effect of the outer winding 21, it is fixed to the left side. Is good.

As shown in FIGS. 1 and 4, since the air-cooled mold transformer has three phases, there are three windings 2 and air holes 81 are provided in each of them. Therefore, even if there is a difference in the cooling effect of each phase, it is possible to adjust the air volume by changing the position of the partition plate 82 for each phase to correct the cooling effect, in other words, the difference in temperature rise. Figure 6
7 is a partially enlarged view showing another embodiment of the present invention, and FIG. 7 is a view taken in the direction of arrow Q. Since they are similar to FIGS. 2 and 3, the same members are given common reference numerals and detailed explanations thereof are omitted. 6 and 7 are different from FIGS. 3 and 4 in that a guide plate 84 is provided instead of the partition plate 82. As shown in FIG. 6, the guide plate 84 has an L-shaped cross section, and the vertical plate portion is attached to the outer diameter surface of the outer winding 21 with a gap. As shown in FIG. 7, the guide plate 84 is also provided with an elongated hole 85, and the fixing position can be changed in the longitudinal direction of the elongated hole 85 as in the case of the partition plate 82.

When the guide plate 84 is changed in the horizontal direction of FIG. 6 and the vertical direction of FIG. 7, the size of the gap between the outer winding 21 and the outer winding 21 changes, so that the flow resistance of this portion changes, and as a result, the flow resistance changes. The flow rate of cooling air flowing through the gap can be adjusted. Further, as described above, the cooling air flowing to the outer diameter side of the outer winding 21 diffuses to the surroundings and the cooling effect is poor, but the guide plate 8
By providing 4, the flow in the vertical direction is emphasized, and a good cooling effect can be secured.

It is also possible to employ a construction in which the partition plate 82 and the guide plate 84 are used together. As described above, the actions of the guide plate 84 and the partition plate 82 are different, so that by using these together, more appropriate adjustment of the cooling air becomes possible. However, the partition plate 82 of FIGS. 3 and 4 and FIG.
If the guide plate 84 shown in FIG. 7 has the same structure as it is, there will be collisions, so a structure suitable for combined use must be adopted.

As shown in FIG. 7, the guide plate 84 has a bent shape like a part of a trapezoid, which is adapted to the curved surface of the outer diameter of the outer winding 21 and is easy to manufacture. Is. Instead of such a polygonal line configuration, a concentric arcuate shape may be adopted on the outer diameter surface of the outer winding 21. Similarly, the notch shape of the wind tunnel 81 for forming the air hole 81 can also be made into an arc shape. These choices are decided by comprehensively considering both the cost and the cooling effect.

[0018]

As described above, according to the present invention, the adjusting plate for adjusting the flow rate and direction of the cooling air sent out from the air hole is variably attached to the air tunnel, so that the air is sent out from the air hole through the air hole. It is possible to adjust the distribution of cooling air to the windings and the iron core, the distribution of each phase, etc. At that time, the position of the adjustment plate can be changed, so the cooling air can actually be applied to the windings under cooling conditions. The effect that the cooling effect can be adjusted to the optimum condition based on the result of measuring the temperature of the winding and the like is obtained.

Further, by constructing the adjusting plate by a partition plate provided so as to reduce the area of the air holes, the flow rate between each phase can be adjusted, and the winding or the iron core corresponding to the mounting position of the partition plate can be adjusted. It is possible to adjust the flow rate to the.
Alternatively, by configuring the adjusting plate with a guide plate attached to the outer diameter side of the outer winding, cooling air that leaks to the outside of the outer winding and does not contribute to the cooling effect is reduced, and It is possible to obtain the effect that the cooling effect is improved by creating cooling air that rises along the radial side.

By attaching both the partition plate and the guide plate to the wind tunnel, both effects can be obtained at the same time. Further, by providing a long hole in the adjusting plate in the direction of changing the position and fixing the long hole in the wind tunnel with a bolt penetrating therethrough, it is possible to easily adjust the position of the adjusting plate.

[Brief description of drawings]

FIG. 1 is an elevation view of a wind-cooled mold transformer showing an embodiment of the present invention.

2 is the same side view as FIG.

FIG. 3 is an enlarged cross-sectional view of part A in FIG.

FIG. 4 is a view on arrow P of FIG.

FIG. 5 is a perspective view of only the wind tunnel of FIG.

FIG. 6 is an enlarged sectional view showing another embodiment of the present invention.

FIG. 7 is a view on arrow Q of FIG.

FIG. 8 is a side view of a conventional air-cooled mold transformer.

9 is an enlarged cross-sectional view of portion E in FIG.

[Explanation of symbols]

 1 iron core 2 winding 21 outer winding 22 inner winding 7 cooling fan 8 wind tunnel 81 air hole 82 partition plate (adjustment plate) 83,85 long hole 84 guide plate (adjustment plate)

Claims (5)

[Claims] 1. A wind-cooled mold transformer having a wind tunnel covering a lower part of a mold transformer, at least one cooling fan attached to a side surface of the mold, and a wind hole provided on an upper surface of the wind fan. An air-cooled mold transformer, characterized in that an adjusting plate for adjusting the flow rate or direction of the cooling air is attached to the wind tunnel in a variable position. 2. The air-cooled mold transformer according to claim 1, wherein the adjusting plate is a partition plate that reduces the area of the air holes. 3. The wind-cooled mold transformer according to claim 1, wherein the adjusting plate is a guide plate mounted on the outer diameter side of the outer winding of the mold transformer with a predetermined gap. vessel. 4. The wind-cooled mold transformer according to claim 1, wherein both the partition plate according to claim 2 and the guide plate according to claim 3 are attached to a wind tunnel. 5. The adjusting plate is provided with a long hole elongated in the position variable direction, and the adjusting plate is fixed to the wind tunnel by a bolt passing through the long hole. Air-cooled mold transformer.