CN111986886B

CN111986886B - Three-dimensional iron core transformer

Info

Publication number: CN111986886B
Application number: CN201911069997.5A
Authority: CN
Inventors: 安东邦彦
Original assignee: Hitachi Industrial Equipment Systems Co Ltd
Current assignee: Hitachi Industrial Equipment Systems Co Ltd
Priority date: 2019-05-24
Filing date: 2019-11-05
Publication date: 2023-07-28
Anticipated expiration: 2039-11-05
Also published as: JP7165623B2; JP2020194812A; CN111986886A

Abstract

The invention provides a three-dimensional iron core transformer. The cooling effect of the three-dimensional iron core transformer is improved by a simple structure. The three-dimensional iron core transformer comprises: a three-dimensional iron core, wherein 3 single-phase iron cores in a rectangular frame shape are configured to be triangular in a plan view, and each three-dimensional iron core is provided with 3 iron core column parts formed by combining 2 iron cores together; and 3 coils respectively arranged on the core limbs, the three-dimensional core transformer is characterized by comprising: an air path formed by the adjacent 3 coils; a lower mounting member mounted on a lower side of the solid core; and a cooling fan that blows cooling air to the air passage through an opening provided in the lower attachment.

Description

Three-dimensional iron core transformer

Technical Field

The invention relates to a cooling structure of a three-dimensional iron core transformer.

Background

Patent document 1 discloses a transformer core in which 3 unit cores of substantially the same cylindrical shape formed by laminating electromagnetic steel plates are symmetrically arranged about the same axis X, and each unit core is arranged such that a part of each unit core is in contact with the other 2 unit cores (refer to abstract of the specification).

Patent document 1: japanese patent laid-open publication No. 2005-333057

Disclosure of Invention

Technical problem to be solved by the invention

According to the transformer described in patent document 1, distortion of the magnetic flux waveform generated in each unit core is further reduced, and thereby the core loss is reduced as compared with the conventional three-phase three-pole transformer, and the efficiency of the transformer can be improved. However, since the 3 unit cores having a cylindrical shape are disposed at the apex positions of the triangle and all the 3 coils are disposed adjacent to each other, heat is likely to be confined to the center portions of the planes where the coils are adjacent to each other as a heat source, and this is not considered.

The invention aims to improve the cooling effect of a three-dimensional iron core transformer by a simple structure.

Means for solving the problems

An example of a "three-dimensional core transformer" according to the present invention for solving the above-described problems is a three-dimensional core transformer comprising: a three-dimensional iron core, wherein 3 single-phase iron cores in a rectangular frame shape are configured to be triangular in a plan view, and each three-dimensional iron core is provided with 3 iron core column parts formed by combining 2 iron cores together; and 3 coils respectively arranged on the core limbs, the three-dimensional core transformer is characterized by comprising: an air path formed by the adjacent 3 coils; a lower mounting member mounted on a lower side of the solid core; and a cooling fan that blows cooling air to the air passage through an opening provided in the lower attachment.

Effects of the invention

According to the present invention, by using the cooling fan, the cooling effect of the three-dimensional core transformer can be improved with a simple structure by supplying air from below the coil to above the coil through the air passage formed between the coils, with respect to the planar central portion where the heat source is concentrated.

The problems, structures, and effects other than those described above will be apparent from the following description of the embodiments.

Drawings

Fig. 1 is a perspective view showing an example of a three-dimensional core transformer according to the present invention.

Fig. 2 is a perspective view showing an iron core of the three-dimensional iron core transformer of fig. 1.

Fig. 3 is a front view showing a three-dimensional core transformer according to embodiment 1.

Fig. 4 is a bottom view showing a three-dimensional core transformer according to embodiment 1.

Fig. 5 is a perspective view showing a three-dimensional core transformer according to embodiment 2.

Fig. 6 is a cross-sectional view of the a-plane of the transformer of fig. 5.

Fig. 7 is a perspective view showing a part of a three-dimensional core transformer according to embodiment 3.

Fig. 8 is a front view of a three-dimensional core transformer of embodiment 4.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings for explaining the embodiments, identical names and symbols are given to identical components as much as possible, and repeated descriptions thereof are omitted.

Example 1

Fig. 1 is a perspective view of an example of a three-dimensional core transformer, and fig. 2 is a perspective view of a three-dimensional core of the three-dimensional core transformer of fig. 1.

The three-dimensional core transformer 1 includes a three-dimensional core 11, a coil 12, a lower mount 14, and an upper mount 13.

The three-dimensional iron core 11 includes 3 single-phase iron cores having the same magnetic path length in a rectangular frame shape, the 3 iron cores are arranged in a triangular shape when viewed from above, and the cross-sectional shape of the core limb portion formed by combining the 2 iron cores is substantially circular. Cylindrical coils 12 are arranged in each of the 3 core legs. The cross-sectional shape of the leg portion of the core formed by combining the 2 cores is substantially circular, and therefore the coil has a cylindrical shape. A lower mount 14 is attached to the lower side of the solid core 11, and an upper mount 13 is attached to the upper side. The coil 12 is supported in the up-down direction by a coil holder 15 disposed between the lower mount 14 and the upper mount 13. The upper mount 13 and the lower mount 14 are coupled by a mount coupling stud 16.

Fig. 3 is a front view of the three-dimensional core transformer of example 1, and fig. 4 is a bottom view.

The lower attachment 14 has a space for disposing the cooling fan 21 at a position in the center of the plane, and has a circular opening 141 for supplying cooling air from below the coil 12 to above the coil 12 through the air passage 17 formed between the coils. The cooling fan 21 is mounted to the opening 141 of the lower mount 14 below the transformer core 11. In addition, in order to facilitate replacement of the cooling fan 21 even after the transformer is installed in the place of use, the lower attachment 14 is configured to secure a space for taking out the cooling fan 21. The cooling fan 21 is detachably attached to the lower attachment 14. When the transformer is operated, the cooling fan 21 is rotated, whereby the cooling air 31 is sent from below the coil 12 to above the coil 12 through the air passage 17 formed between the coils.

In the three-dimensional core transformer, the coils arranged in each leg are arranged at the vertex positions of the triangle, and all 3 coils are adjacent. Therefore, the heat is easily confined to the planar center portions of the three-leg cores and the coils. According to the present embodiment, the cooling fan disposed in the center of the plane below the coil is used to supply cooling air from below the coil to above the coil through the air passage formed between the coils for the center of the plane where the heat source is concentrated, so that the cooling effect can be improved with a simple structure. In addition, since the cooling fan is detachably attached to the lower attachment, inspection and replacement of the cooling fan are easy.

Example 2

Fig. 5 is a perspective view of a three-dimensional core transformer according to embodiment 2 of the present invention, and fig. 6 is a cross-sectional perspective view of a plane a of fig. 5.

In the three-dimensional core transformer according to embodiment 2, the cooling fan 21 is disposed on the lower side of the lower mount 14, and the air duct 41 for guiding the cooling air from the cooling fan 21 to the opening 141 of the lower mount 14 is provided. The cooling air duct 41 from the cooling fan 21 leads to the opening 141 of the lower mount 14. Then, as in example 1, cooling air 31 is sent from below the coil 12 to above the coil 12 through the air passage 17 formed between the coils.

According to the present embodiment, in addition to the effect of embodiment 1, since the cooling fan 21 is disposed on the lower side of the lower mount 14, inspection and replacement of the cooling fan 21 are facilitated.

Example 3

Fig. 7 shows a part of a three-dimensional core transformer according to embodiment 3 of the present invention. Fig. 7 (a) is a perspective view of a solid core mounted on a lower mount of a solid core transformer, and fig. 7 (b) is a perspective view of the lower mount and a sealing member.

As shown in fig. 2, the solid core 11 has a gap 50 at a corner where the single-phase cores are combined, and when cooling air is sent from the cooling fan, the cooling air leaks from the gap 50. In this embodiment, as shown in fig. 7, a leakage preventing plate 51 as a sealing member is attached to each corner 50 of the three-dimensional iron core 11 so as to block the gap 50 at the corner. Preferably, the air leakage preventing plate 51 is integrated with the lower mount 14.

According to the present embodiment, the air sent from the cooling fan can be sent to the air passage between the coils without leaking from the gap of the solid core, and therefore the cooling effect can be improved.

Example 4

Fig. 8 shows a three-dimensional core transformer according to embodiment 4 of the present invention. Fig. 8 is a front view of a three-dimensional core transformer.

In this embodiment, in addition to the content of embodiment 1, a coil-side wiring 121 for a cooling fan power supply is provided, and a terminal block 23 for connection of a power supply lead 22 of the cooling fan is provided in the lower mount 14 in the peripheral portion of the cooling fan. The power supply lead 22 of the cooling fan 21 is connected by a terminal block 23.

According to the present embodiment, the wiring workability at the time of replacement of the cooling fan can be improved.

Description of the reference numerals

1 … … three-dimensional iron core transformer

11 … … iron core (solid iron core)

12 … … coil

121 … … coil side wire for cooling fan power supply

13 … … upper mount

14 … … lower mounting

141 … … lower mount opening

15 … … coil holder

16 … … mounting connecting stud

17 … … wind path

21 … … cooling fan

22 … … cooling fan power lead

23 … … terminal base

31 … … cooling air

41 … … air duct

Gap of 50 … … core

51 … … air leakage prevention plate.

Claims

1. A three-dimensional core transformer, comprising: a three-dimensional iron core, wherein 3 single-phase iron cores in a rectangular frame shape are configured to be triangular in a plan view, and are provided with 3 iron core column parts, and the iron core column parts are formed by combining 2 iron cores together; and 3 coils respectively arranged on the core limbs, the three-dimensional core transformer is characterized by comprising:

an air path formed by the adjacent 3 coils;

a lower mounting member mounted on a lower side of the solid core; and

a cooling fan for blowing cooling air,

blowing cooling air from the cooling fan to the air path through an opening provided in the lower attachment,

and a leakage preventing plate for sealing the gap at the corner of the lower part of the core column of the 2 iron cores of the three-dimensional iron core in a manner of blocking the gap at the corner.

2. The three-dimensional iron core transformer of claim 1, wherein:

the cooling fan is arranged below the three-dimensional iron core and is positioned in the center of the plane.

3. The three-dimensional iron core transformer of claim 2, wherein:

in the planar center portion, cooling air flows from below the coil to above the coil through the air passage formed between the coils, thereby improving the cooling effect.

4. A three-dimensional iron core transformer as defined in claim 3, wherein:

the lower mount has a space for disposing a cooling fan at a position in the center of the plane, and the cooling fan is disposed in the space.

5. The three-dimensional iron core transformer of claim 2, wherein:

the cooling fan is detachably mounted to the lower mount.

6. The three-dimensional iron core transformer of claim 1, wherein:

a coil holder is provided between the lower mount and the coil.

7. The three-dimensional iron core transformer of claim 1, wherein:

has a wind guide pipe for blowing cooling wind from the cooling fan to an opening part of the lower mounting member,

the cooling fan is provided laterally to the lower mount and is located at a position where cooling air can be blown to the air duct.

8. The three-dimensional iron core transformer of claim 1, wherein:

the air leakage prevention plate is integrated with the lower mounting member.

9. The three-dimensional iron core transformer of claim 1, wherein:

the terminal block for wiring of the power supply lead of the cooling fan is disposed at the periphery of the cooling fan of the lower mounting member.