CN111986886A

CN111986886A - Three-dimensional iron core transformer

Info

Publication number: CN111986886A
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: 2020-11-24
Anticipated expiration: 2039-11-05
Also published as: JP2020194812A; JP7165623B2; CN111986886B

Abstract

The invention provides a three-dimensional iron core transformer. The cooling effect of the three-dimensional iron core transformer is improved by using a simple structure. The three-dimensional iron core transformer comprises: a three-dimensional core in which 3 single-phase cores having a rectangular frame shape are arranged in a triangular shape in plan view, and which has 3 core column portions formed by 2 cores being combined together; and 3 coils respectively arranged at the core leg portions, the three-dimensional core transformer is characterized by comprising: the 3 coils are adjacent to form an air path; a lower mounting member mounted on a lower side of the stereoscopic core; and a cooling fan for blowing 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 having substantially the same cylindrical shape formed by laminating electromagnetic steel sheets are symmetrically arranged around the same axis X, and each unit core is arranged so that a part of each unit core is in contact with another 2 unit cores (see 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, so that the iron loss is reduced as compared with a conventional three-phase three-limb transformer, and the efficiency of the transformer can be improved. However, since 3 cylindrical unit cores are arranged at the apex of a triangle and 3 coils are all arranged adjacent to each other, heat is easily confined in the center of the plane where the heat sources, i.e., the coils, are adjacent to each other, and this is not considered.

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

Means for solving the problems

An example of the "three-dimensional iron-core transformer" of the present invention for solving the above problems is a three-dimensional iron-core transformer including: a three-dimensional core in which 3 single-phase cores having a rectangular frame shape are arranged in a triangular shape in plan view, and which has 3 core column portions formed by 2 cores being combined together; and 3 coils respectively arranged at the core leg portions, the three-dimensional core transformer is characterized by comprising: the 3 coils are adjacent to form an air path; a lower mounting member mounted on a lower side of the stereoscopic core; and a cooling fan for blowing cooling air to the air passage through an opening provided in the lower attachment.

Effects of the invention

According to the present invention, the cooling fan blows air from below the coils to above the coils through the air passage formed between the coils at the center of the plane where the heat source is concentrated, and thus the cooling effect of the three-dimensional core transformer can be improved with a simple structure.

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 iron-core transformer according to the present invention.

Fig. 2 is a perspective view illustrating an iron core of the stereoscopic iron core transformer of fig. 1.

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

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

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

Fig. 6 is a 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 iron-core transformer according to example 3.

Fig. 8 is a front view of a three-dimensional core transformer according to example 4.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings for describing the embodiments, the same components are denoted by the same names and symbols as much as possible, and redundant description thereof will be 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 solid core transformer 1 includes a solid core 11, a coil 12, a lower mounting member 14, and an upper mounting member 13.

The three-dimensional core 11 includes 3 single-phase cores having the same magnetic path length and having a rectangular frame shape, and the 3 cores are arranged in a triangular shape when viewed from above, and the cross-sectional shape of the core column portion formed by combining 2 cores is substantially circular. Cylindrical coils 12 are disposed in the 3 leg portions, respectively. Since the cross-sectional shape of the leg portion of the core formed by combining 2 cores is substantially circular, the coil is cylindrical. A lower fixture 14 is attached to the lower side of the three-dimensional core 11, and an upper fixture 13 is attached to the upper side. The coil 12 is vertically supported by a coil holder 15 disposed between the lower fixture 14 and the upper fixture 13. The upper attachment 13 and the lower attachment 14 are coupled by attachment coupling studs 16.

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

The lower fixture 14 has a space in which the cooling fan 21 is disposed at the center of the plane, and has a circular opening 141 for sending cooling air from below the coils 12 to above the coils 12 through the air passage 17 formed between the coils. The cooling fan 21 is attached to the opening 141 of the lower fixture 14 below the transformer core 11. In addition, in order to facilitate the replacement work of the cooling fan 21 even after the transformer is installed in a place of use, a structure is adopted in which a space for taking out the cooling fan 21 is secured in the lower attachment 14. The cooling fan 21 is detachably attached to the lower attachment 14. When the transformer is operated, the cooling fan 21 is rotated to send cooling air 31 from below the coils 12 to above the coils 12 through the air passage 17 formed between the coils.

In the three-dimensional iron core transformer, the coils of the respective columns are arranged at the vertex positions of the triangle, and all of the 3 coils are adjacent. Therefore, the heat is easily confined in the planar central portions of the three-column core and the coil. According to the present embodiment, the cooling fan disposed below the coils and at the center of the plane is used to feed the cooling air from below the coils to above the coils through the air passage formed between the coils in the center of the plane where the heat source is concentrated, and the cooling effect can be improved with a simple configuration. In addition, since the cooling fan is detachably mounted on the lower mounting member, inspection and replacement of the cooling fan are easy.

[ example 2]

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

In the three-dimensional core transformer of example 2, the cooling fan 21 is disposed on the lower side of the lower attachment 14, and the air duct 41 for guiding the cooling air from the cooling fan 21 to the opening 141 of the lower attachment 14 is provided. The cooling air guide duct 41 from the cooling fan 21 is guided to the opening 141 of the lower attachment 14. Then, as in example 1, the cooling air 31 is sent from below the coils 12 to above the coils 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 attachment 14, inspection and replacement of the cooling fan 21 are facilitated.

[ example 3]

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

As shown in fig. 2, the three-dimensional core 11 has a gap 50 at a corner portion 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 the present embodiment, as shown in fig. 7, a wind leakage preventing plate 51 as a sealing member is attached to each corner 50 of the three-dimensional core 11 so as to close the corner gap 50. The wind leakage preventing plate 51 is preferably integrated with the lower mount 14.

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

[ example 4]

Fig. 8 shows a three-dimensional iron-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 contents of embodiment 1, the coil-side wiring 121 for the cooling fan power supply is provided, and the lower fixture 14 in the periphery of the cooling fan is provided with the terminal block 23 for connection of the power supply lead 22 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 … … solid iron core transformer

11 … … iron core (solid iron core)

12 … … coil

121 … … coil side wiring for cooling fan power supply

13 … … Upper mounting

14 … … lower mounting

141 … … lower mounting piece opening part

15 … … coil holder

16 … … mounting piece connecting column bolt

17 … … air path

21 … … cooling fan

22 … … cooling fan power lead

23 … … terminal base

31 … … cooling air

41 … … air guide pipe

Gap of 50 … … iron core

51 … … leakproof plate.

Claims

1. A three-dimensional core transformer, comprising: a three-dimensional core in which 3 single-phase cores having a rectangular frame shape are arranged in a triangular shape in plan view, and which has 3 core column portions formed by combining 2 cores together; and 3 coils respectively arranged at the core leg portions, the three-dimensional core transformer is characterized by comprising:

The 3 coils are adjacent to form an air path;

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

a cooling fan for blowing cooling air,

the cooling air from the cooling fan is blown to the air passage through an opening provided in the lower attachment.

2. The stereoscopic 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 stereoscopic core transformer of claim 2, wherein:

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

4. The stereoscopic core transformer of 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 stereoscopic core transformer of claim 2, wherein:

the cooling fan is removably mounted to the lower mount.

6. The stereoscopic core transformer of claim 1, wherein:

A coil retainer is provided between the lower mount and the coil.

7. The stereoscopic core transformer of claim 1, wherein:

an air guide duct for blowing cooling air from the cooling fan to an opening provided in the lower attachment,

the cooling fan is provided on a side of the lower attachment member and is located at a position where cooling air can be blown toward the air guide duct.

8. The stereoscopic core transformer of claim 1, wherein:

the air leakage preventing plate is used for sealing gaps at the corners of the three-dimensional iron core.

9. The stereoscopic core transformer of claim 8, wherein:

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

10. The stereoscopic core transformer of claim 1, wherein:

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