JP3427629B2 - Electromagnetic induction equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of cooling of electromagnetic induction equipment, and more specifically, to improvement of cooling performance of a coil located in a window of an iron core.

[0002]

2. Description of the Related Art A transformer is taken as an example of a conventional electromagnetic induction device and will be described with reference to FIGS. This transformer is disclosed in JP-A-56-51813, FIG. 4 is a plan view of a three-phase transformer, FIG. 5 is a front view of the three-phase transformer,
FIG. 6 is a horizontal sectional view taken along line VI-VI in FIG. Figure 4
6, the transformer includes an iron core 1, a pair of holding members 2 for fastening the iron core 1 in the stacking direction, and an iron core 1.
With three coils 3 consisting of U-phase, V-phase, W-phase inserted in the legs 1a, 1b, 1c, and a coil retainer 4 for preventing the coils 3 from being deformed by electromagnetic mechanical force,
It is mainly composed.

The coil 3 is composed of two plate-like intervening members 5 having insulating properties which are interposed between the side surfaces of the coils 3 and the iron core 1.
Two in-window coil bases 6 having an insulating property interposed between the lower surface inside the window and the bottom surface of the coil 3, and the outer (u-phase, w-phase) coil 3 provided at both side ends of the iron core 1. Insulating two outside coil bases 7 for mounting respectively
The upper end of an insulating plate-shaped coil support 8 is brought into contact with the bottom surface of each coil 3, and the side surface of the lower end of the coil support 8 is fixed to the metal fitting 12, so that the coil support 8 faces each other. The coil 3 is attached to the iron core 1 while ensuring insulation by being provided.

[0004] inside the coil 3, a longitudinal spacer 11 which is shortened by the end insulator 9 than the height of the coil 3, as shown in FIG. 7, by arranging the winding direction of the coil 3 at a predetermined interval, A vertical duct 10 is formed so as to allow a cooling medium to pass in the vertical direction by providing a gap in the vertical direction of the coil 3, and horizontal ducts 15 are formed in the respective horizontal directions at the upper and lower ends of the coil 3.

The flow of the cooling medium in the coil in the iron core window of the transformer configured as described above will be described with reference to FIG. 7 is a sectional view taken along the line VII-VII in FIG.
An end insulator 9 is provided in the coil 3.

The cooling medium is the horizontal duct 1 below the coil 3.
Each vertical duct 1 flowing in from 5 and moving horizontally
It branches to 0 and rises inside the coil 3. The cooling medium that has risen in each vertical duct 10 above the coil 3 merges with each other in the horizontal duct 15, changes its direction in the horizontal direction, and flows out of the coil 3. In addition, the cooling medium outside the window of the iron core 1 is the vertical duct 10 in the lower part of the coil 3.
From the coil 3, passes through the duct 10, and flows out of the coil 3.

[0007]

Since the conventional transformer is constructed as described above, in order to support the plurality of coils 3 on the iron core 1, a large number of intervening members 5 having an insulating property are used.
And a coil support 6 inside the window, a coil support 7 outside the window, and a coil support 8, and the coil support 6 inside the window is connected to the coil 3 and the iron core 1.
There was the first problem that the workability was not good because it had to be assembled.

Also, in order to improve the cooling performance of the coil 3 located in the window of the iron core 1, the length of the vertical spacer 11 is made shorter than the height of the coil 3 by the height of the upper and lower end insulators 9. Since the horizontal duct 15 must be formed inside the coil 3 by disposing the vertical spacers 11 inside the ends of the upper and lower end insulators 9 in the coil 3, the formation of the horizontal duct 15 is There was a second problem that it was complicated and workability was not good.

Further, since the horizontal duct 15 is formed inside the coil 3, there is a third problem that the outer shape of the height becomes high because the coil 3 has a function other than the original voltage conversion function.

The present invention has been made to solve the above-mentioned problems, and reduces the insulating member required for mounting a plurality of coils on the iron core, and makes it possible to reduce the coil located in the window of the iron core with a simple structure. The present invention provides an electromagnetic induction device having improved cooling performance and a small coil outer shape.

[0011]

According to a first aspect of the present invention, there is provided an electromagnetic induction device in which a laminated iron core having a plurality of legs and a window, a leg of the iron core, and a window of the iron core. An electromagnetic induction device comprising a coil to be arranged and a sandwiching member for sandwiching the iron core in the stacking direction so as to overlap the lower end portion of the iron core and a part of the window of the iron core. A cooling duct is installed between the winding layers so that
A suction hole is formed in a part of the portion of the holding member that holds the iron core so as to communicate with the window of the iron core and the cooling duct of the coil. Therefore, the cooling medium flowing in from the suction hole flows into the cooling duct inside the coil located in the window of the iron core and flows out to the outside of the coil.

In the electromagnetic induction device according to the second aspect of the present invention, the iron core has an upper yoke, a lower yoke and legs, and the lower yoke has a pinch.
A notch is provided so as to communicate with the suction hole of the holding member .

[0013]

[0014]

DETAILED DESCRIPTION OF THE INVENTION

Embodiment 1. An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 by taking a transformer as an example. Figure 1
[Fig. 2] is a front view showing a coil receiver in the case of a three-phase transformer, and Fig. 2 is a vertical sectional view taken along the line II-II in Fig. 1.

In the figure, the same reference numerals as those used in the prior art indicate the same or corresponding portions. Inside the coil 30, as shown in FIG. 2, a vertical spacer 111 having substantially the same height as the coil 30 is provided.
Are arranged at a predetermined interval in the winding direction of the coil 30, and the vertical spacers 111 form a vertical direction of the coil 30, that is, a gap is formed between the winding layers. The cooling duct 100 is formed so that the cooling duct 100 passes in the direction of the cylindrical hollow portion of FIG. The coil 30 is not provided with the horizontal duct 15 unlike the conventional coil 3.

Referring to FIG. 1, the transformer has an iron core 1 having windows 1x and 1z, and a pair of sandwiching members having a substantially U-shaped cross section for fastening the lower yoke 1d of the iron core 1 in the stacking direction. 20 and three coils 30 inserted in the legs 1a, 1b, 1c of the iron core 1 are mainly configured. Here, the holding member 20 is attached so as to hold the lower yoke 1d of the iron core 1 and a part of the windows 1x and 1z of the iron core 1. Two suction holes 20a, 20b having a substantially rectangular shape are formed in each of the upper vertical surfaces of the pair of holding members 20, and the suction holes 20a, 20b and the window 1 of the iron core 1 are formed.
x, 1z are communicated with each other.

A coil retainer 4 for preventing the coil 30 from being deformed by electromagnetic mechanical force, two insulating plate-like intervening members 5 interposed between the side surfaces of the coils 30, and three coils 30. And a coil receiving base 13 of a substantially quadrangular prism that is interposed between the bottom surface of the holding member 20 and the top surface of the holding member 20. Here, the cooling medium is the coil 30 of the transformer.
A substantially sealed flow passage 30a is formed including the coil pedestal 13 so as to circulate inside. In this respect,
In contrast to the conventional insulating member or the like which merely performs the insulating function, in this embodiment, a part of the flow passage 30a for cooling the inside of the coil 30 including the insulating member is formed. ing.

Next, the flow of the cooling medium of the transformer constructed as described above will be described with reference to FIG. The cooling medium flows in through the two suction holes 20a and 20b of the holding member 20,
The coil 30 in the window of the iron core 1 flows in from the lower end of the cooling duct 100, passes through the cooling duct 100 in the coil 30, flows out of the coil 30 from the upper end of the cooling duct 100, and the upper core yoke 1u And flows out of the window of the iron core 1 through the gap between the coils 30.

The height of the holding member 20 is set to the lower yoke 1d.
If the suction holes 20a, 20b are bored in the upper part of the sandwiching member 20 at a height higher than the height of the cores 1, the heights of the windows 1x, 1z of the iron core 1 are enlarged, and the utilization factor of the iron core 1 is slightly deteriorated. The height of the vessel increases. As a solution to this, as shown in FIG. 3, cutouts 10 are formed on both end surfaces of the lower yoke 1d of the iron core 1.
1x is provided, and a convex portion 101z is provided in the central portion. Intake hole 2 without reducing the magnetic utilization of iron core 1
Since the areas of 0a and 20b can be increased, the circulation of the cooling medium becomes easier. Further, in the above embodiment, the cross-sectional shape is the convex portion 101z, but the shape is not limited to this shape, and the suction holes 20a and 20b of the holding member 20 are not limited to this shape.
It is sufficient to cut out the iron core 1 so that it can communicate with.

Further, in the above embodiment, the flow passage 30a is provided.
The coil pedestal 13 is also part of the formation of the coil. However, this coil pedestal 13 is not necessary for the flow passage 30a because it is unnecessary if the bottom surface of the coil 30 is sufficiently insulated.

[0021]

According to the first aspect of the present invention, a laminated iron core having a plurality of legs and windows, a coil inserted into the legs of the iron core and arranged in the window of the iron core, and an iron core An electromagnetic induction device including a sandwiching member that sandwiches the iron core in the stacking direction so as to overlap the lower end of the iron core and a part of the iron core window,
The coil is provided with a cooling duct between the winding layers so that the cooling medium can circulate inside, and a portion for sandwiching the iron core of the sandwiching member.
Since a suction hole was formed in a part of the so as to communicate with the iron core window and the cooling duct of the coil, it is not necessary to shorten the length of the vertical spacer to form a horizontal duct inside the coil. This has the effect of facilitating the manufacture of the coil.

According to the second invention, the iron core includes an upper yoke, a lower yoke and legs, and the lower yoke has a holding portion.
Since the notch is provided so as to communicate with the suction hole of the material , in addition to the effect of the first invention, there is an effect that the height dimension of the coil does not become higher than necessary.

[0023]

[Brief description of drawings]

FIG. 1 is a front view of a transformer according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II of FIG.

FIG. 3 is a vertical cross-sectional view taken along the line II-II of FIG. 1 in which the core lower yoke is provided with a notch in another embodiment of the present invention.

FIG. 4 is a plan view of a conventional transformer.

FIG. 5 is a front view of a conventional transformer.

6 is a horizontal cross-sectional view of the coil taken along line VI-VI in FIG.

7 is a cross-sectional view of the outside of the iron core window taken along the line VII-VII in FIG.

[Explanation of symbols]

1 iron core, 1u iron core upper yoke, 1d iron core lower yoke,
1a, 1b, 1c Iron core leg, 2, 20 Clamping member, 20
a, 20b suction hole, 3,30 coil, 9 end insulator, 13 insulating member, 100 cooling duct, 101X
Notch, 111 vertical spacer.

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Claims (2)

(57) [Claims] 1. A laminated iron core having a plurality of legs and a window, a coil which is inserted into the legs of the iron core and is arranged in the window of the iron core, a lower end of the iron core and the iron core. An electromagnetic induction device including a sandwiching member that sandwiches the iron core in the stacking direction so as to overlap a part of the window of the coil, and the coil is cooled between winding layers so that a cooling medium can flow inside. A duct is provided to clamp the iron core of the clamp member.
An electromagnetic induction device characterized in that a suction hole is formed in a part of a portion to be connected so as to communicate with the window of the iron core and the cooling duct of the coil. 2. The iron core comprises an upper yoke, a lower yoke and legs, and the lower yoke is provided with a notch so as to communicate with the suction hole of the holding member. The electromagnetic induction device according to claim 1.