WO2017136997A1

WO2017136997A1 - Stack-type, planar, three-phase open transformer core

Info

Publication number: WO2017136997A1
Application number: PCT/CN2017/072075
Authority: WO
Inventors: 齐侠; 齐会南
Original assignee: 齐侠
Priority date: 2016-02-10
Filing date: 2017-01-22
Publication date: 2017-08-17
Also published as: CN105469950A

Abstract

Disclosed is a stack-type, planar, three-phase open transformer core. The core comprises two inner ring single-frame cores formed by sequentially stacking an inner layer strip group (3), a middle layer strip group (4) and an outer layer strip group (5), and one outer ring single-frame core. Openings of single-ring strip frames constituting the inner layer strip group are symmetrically disposed at an upper end of a single-frame core limb (11), openings of single-ring strip frames constituting the middle layer strip group are symmetrically disposed at the upper end of the single-frame core limb and on an inclined surface forming a bend between the single-frame core limb and a single-frame core upper yoke (12), and openings of single-ring strip frames constituting the outer layer strip group are symmetrically disposed at the upper end of the single-frame core limb, on the inclined surface forming the bend between the single-frame core limb and the single-frame core upper yoke and at both ends of the single-frame core upper yoke. A distance between the opening on each single-ring strip frame and the nearest bending angle from the opening is greater than or equal to 5 mm. The core of the present invention has high mechanical strength, strong resistance to sudden short circuits, and high plug-in mounting efficiency.

Description

Folding planar three-phase open transformer core

Technical field

The invention relates to the technical field of transformers, in particular to a folded planar three-phase open transformer core.

Background technique

The transformer core is an important component of the transformer. The types of transformers can be divided into single-phase transformers and three-phase transformers. In recent years, with the promotion of energy-saving products in the country, a folded planar three-phase open transformer core with remarkable energy-saving effect and detachability has been widely used. The folded planar three-phase open transformer core has light weight and volume. Small, no-load loss, simple manufacturing process, low noise, good energy saving effect, strong heat dissipation and overload capability, compact structure, superior mechanical and electrical performance, etc. However, the folded planar three-phase open transformer core is still There are deficiencies, such as: the position of the open joint can only be concentrated on the upper end of the iron core column, which is easy to cause looseness, displacement and deformation, poor resistance to sudden short circuit, inconvenient to insert the iron yoke, low insertion efficiency .

Therefore, how to improve the structural strength of the existing planar transformer core to improve its mechanical strength, resistance to sudden short circuit and insertion efficiency has become an urgent problem to be solved.

Summary of the invention

In view of this, the object of the present invention is to provide a folded planar three-phase open transformer core to solve the problems of poor mechanical strength of the planar transformer core, poor resistance to sudden short circuit, and low insertion efficiency.

In order to solve the above problems, the technical solution provided by the present invention is: a folded planar three-phase open transformer core, which is composed of two inner ring single-frame iron cores and one stacked on the outer side of the inner ring single-frame iron core The ring single frame iron core is composed, wherein the inner ring single frame iron core and the outer ring single frame iron core respectively comprise a single frame iron core column, a single frame iron core upper yoke, a single frame iron core lower yoke and a bending inclined surface, The single-frame iron core and the outer ring single-frame iron core are respectively stacked by the inner layer belt group, the middle layer belt group and the outer layer belt group, and the middle layer belt group includes the middle layer first belt group and the stacking layer. In the middle second belt group outside the middle first belt group, the outer belt group includes an outer first belt group and an outer layer second stacked on the outer side of the outer first belt group a tape set and an outer third band set stacked on the outer side of the outer second tape set, wherein the inner layer set, the middle first strip set and the outer first strip set are respectively The plurality of openings are symmetrically arranged on the upper end of the single-frame iron core column, and the second layer of the middle layer is assembled. The group and the outer second belt group are respectively formed by stacking a plurality of openings symmetrically arranged on the bending slant between the single-frame iron core column and the single-frame iron core yoke, and the outer layer The third strip group is formed by stacking a plurality of openings in a single ring strip frame symmetrically disposed at two ends of the single-frame iron core upper yoke, wherein the opening on each single-ring strip frame is located on and separated from The distance of the nearest bending angle of the opening is ≥5 mm, and the openings on the single-ring strip frame forming the outer third belt group are located in the column space extending upward along the core of the transformer core, wherein The transformer iron core column is formed by combining a single-frame iron core of an inner ring and a single-frame iron core of an outer ring single-frame iron core.

Preferably, the middle layer belt group and/or the outer layer material belt group constituting the inner ring single-frame iron core are a plurality of groups, and the middle layer material belt groups of each group are sequentially stacked, and the outer layer material belt groups of each group are stacked in turn; The middle layer belt group and/or the outer layer material belt group of the circle single frame iron core are multi-group, and the middle layer material belt groups of each group are sequentially stacked, and the outer layer material belt groups of each group are stacked one on another.

Further preferably, the single-ring strip frame constituting the inner layer strip set, the middle layer strip set and the outer layer strip set is correspondingly provided with eight 135 degree bend angles.

Further preferably, the single-ring strip frame constituting the inner layer strip set, the middle layer strip set and the outer layer strip set is correspondingly provided with twelve 150 degree bend angles.

Further preferably, the middle second tape set and the outer second tape set respectively comprise a plurality of single ring strip frames symmetrically disposed on the first bending slope and a plurality of stacked symmetrically disposed at the first fold a single-ring strip frame outside the single-ring strip frame on the curved slope and symmetrically disposed on the second bend slope surface, wherein the first bend slope is located on the single-frame iron core pillar and the single-frame iron core upper yoke The first end is connected to the single-frame iron core, and the two ends of the second bending inclined surface are respectively connected with the first bending inclined surface and the single-frame iron core upper yoke.

Further preferably, the opening positions of the single-ring strips constituting the inner layer strip group, the middle layer strip group and the outer layer strip group are arranged in a staggered arrangement.

Further preferably, the cross-section of the transformer core stud is oblong or round-like inscribed polygon or stepped or rectangular or circular.

The beneficial effects of the folded planar three-phase open transformer core provided by the present invention are as follows:

1. The opening on the single-ring strip frame constituting the inner layer strip set, the middle layer strip set and the outer layer strip set is the same as the bend angle on the single-ring strip frame and closest to the opening The distance is ≥5mm, so that a limit portion of length ≥5mm is formed at the opening of the single-ring strip frame, and the limit portion can reach the upper and lower and/or left and right direction limits of the single-ring strip frame located inside thereof Position, specific: When the core is inserted, the outer third belt group that constitutes the outer belt group can prevent the second belt group from being swayed on the inner side, and the second material The belt group can prevent the turbulence of the first layer of the outer layer located on the inner side thereof, and achieve the effect of locking in the outer belt group, and the middle second belt group constituting the middle layer belt group can prevent the middle layer located at the inner side thereof The turbulence of the first belt group achieves the purpose of locking in the middle belt group, and at the same time, the outer belt group as a whole can also prevent the swaying of the middle layer belt group located at the inner side thereof, and the middle layer belt group It is also possible to prevent the turbulence of the inner layer of the belt group located on the inner side thereof, and realize the outer layer of the belt group, The purpose of locking between the strip group and the inner strip group is to solve the problem that the iron core which is only open at the upper end of the stem is easy to be longitudinally loosened, displaced, deformed under the action of a strong electromagnetic field, and has poor resistance to sudden short circuit. At the same time, the locking effect in the belt group and the belt group greatly improves the mechanical strength of the core;

2. The transformer core increases one opening of the existing transformer core to three openings, and the increased opening portions are exposed outside the coil, which is obviously visible, facilitating the insertion of the iron core and improving the core insertion. Efficiency, reduce the cost of artificial production, increase the core after opening, disperse the position of the opening, reduce the vibration, improve the noise, and further improve the ability of the core to resist sudden short circuit;

3. The openings on the single-ring strip frame forming the outer third strip group are located in the columnar space extending upward along the core of the transformer core, which facilitates the assembly of the coil, so that the coil is placed from top to bottom. The outside of the transformer core is not stuck during the process.

DRAWINGS

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

1 is a schematic structural view of an embodiment of a folded planar three-phase open transformer core according to the present invention;

2 is a schematic structural view of another embodiment of a folded planar three-phase open transformer core according to the present invention;

3 is a schematic structural view of an embodiment of an inner ring single-frame iron core;

4 is a schematic structural view of another embodiment of an inner ring single-frame iron core;

Figure 5 is a schematic structural view of an embodiment of an inner layer strip;

6 is a schematic structural view of another embodiment of an inner layer strip group;

Figure 7 is a schematic structural view of an embodiment of a middle layer tape set;

Figure 8 is a schematic structural view of another embodiment of a middle layer tape set;

Figure 9 is a schematic structural view of an embodiment of an outer layer strip;

Figure 10 is a schematic view showing the structure of another embodiment of the outer layer strip;

Figure 11 is a cross-sectional view of a transformer core core in an oblong shape;

Figure 12 is a cross-sectional view of a transformer core stud having a circle-inscribed polygon;

Figure 13 is a cross-sectional view of a stepped transformer core stud;

Figure 14 is a cross-sectional view of a rectangular core of a transformer;

Figure 15 is a cross-sectional view of a transformer core core in a circular shape.

detailed description

The invention will be further explained below in conjunction with specific embodiments, but is not intended to limit the invention.

As shown in FIG. 1 and FIG. 2, the present invention provides a folded planar three-phase open transformer core, which is composed of two inner ring single-frame iron cores 1 and one stacked on the outer side of the inner ring single-frame iron core 1. The outer ring single-frame iron core 2 is composed, wherein the inner ring single-frame iron core 1 and the outer ring single-frame iron core 2 each comprise a single-frame iron core column 11, a single-frame iron core upper yoke 12, and a single-frame iron core The yoke 13 and the bending inclined surface 14, the inner ring single-frame iron core 1 and the outer ring single-frame iron core 2 are respectively stacked by the inner layer belt group 3, the middle layer material belt group 4 and the outer layer

material belt group

5, 3 and FIG. 4 are schematic structural views of the inner ring single-frame iron core. As shown in FIG. 7 and FIG. 8, the middle layer tape set 4 includes a middle first tape group 41 and a middle layer first tape group. The outer second intermediate tape set 42 of the outer side 41, as shown in Figs. 9 and 10, the outer layer tape set 5 includes an outer first tape group 51, which is stacked on the outer side of the first tape set 51. An outer second strip set 52 and an outer third strip set 53 stacked outside the outer second strip set 52, wherein the inner strip set 3 (shown in Figures 5 and 6) ), the middle first tape set 41 (shown in Figures 7 and 8) and the outer first tape The group 51 (shown in FIGS. 9 and 10) is respectively formed by stacking a plurality of single-ring strip frames symmetrically disposed at the upper end of the single-frame iron core stud 11 and the middle second strip group 42 (FIG. 7 and FIG. 8) and the outer second strip group 52 (shown in FIGS. 9 and 10) are respectively symmetrically disposed between the single-frame iron core stud 11 and the single-frame iron core upper yoke 12 by a plurality of openings. The single-ring strips on the curved bevel 14 are stacked, and the outer third strip set 53 (shown in FIGS. 9 and 10) is symmetrically disposed on the ends of the single-frame core upper yoke 12 by a plurality of openings. The loops are stacked in a frame, wherein the distance between the opening on each single-ring strip frame and the bend angle located on the same side of the opening is ≥5 mm, as shown in FIGS. 1 and 2 The openings on the single-ring strip frame constituting the outer third strip group 53 are all located in the columnar space extending upward along the transformer core post 6, as shown in FIG. 1 and FIG. 2, the single-ring strip frame The upper openings are located in the range of the A, B, and C regions, wherein the area A represents an openable area on the single-frame iron core, which is located at the upper end of the single-frame iron core and at a bend angle Distance ≥5mm, area B represents An openable area on the curved slope, the distance from the bend angle is ≥5 mm, and the openable area of the upper yoke of the single-frame iron core of the region C is located in the cylindrical space extending upward along the core of the transformer core and The distance from the bend angle is ≥5 mm, wherein the transformer core stud 6 is formed by combining the inner ring single-frame iron core 1 and the single-frame iron core stud 11 of the outer ring single-frame iron core 2, wherein Each of the rectangular frames shown in Figures 1 through 10 represents a set of single-ring strip frames, and does not represent only a single-turn strip frame.

The folded planar three-phase open transformer core has an opening on a single-ring strip frame constituting an inner layer strip group, a middle layer strip group and an outer layer strip group, and is located on the single-ring strip frame The distance of the opening angle of the opening is ≥5 mm, so that a limit portion having a length ≥ 5 mm is formed at the opening of the single-ring strip frame, and the limiting portion can play a single-ring belt on the inner side thereof The upper and lower or/and the left and right direction of the frame, specifically: when the core is inserted, the outer third band of the outer layer of the outer band can prevent the second tape on the inner side of the outer band. The group of turbulence, the outer second belt group can prevent the turbulence of the first belt group on the inner side of the outer layer, and realize the purpose of locking in the outer belt group, and form the middle layer of the middle layer group. The belt set can prevent the turbulence of the first layer of the middle layer located on the inner side thereof, thereby achieving the purpose of locking in the middle belt group, and at the same time, the outer belt group as a whole can also prevent the middle layer located on the inner side thereof. With the set of turbulence, the middle layer of the belt can also prevent the inner layer of tape on the inside Group turbulence, realizing the outer belt group, the middle belt group and the inner layer The purpose of locking between the strip sets is to solve the problem that the iron core which is only open at the upper end of the stem is easy to be longitudinally loosened, displaced, deformed, and has short resistance to sudden short circuit under the action of a strong electromagnetic field. The locking action in the strip group and the strip group greatly improves the mechanical strength of the core. In addition, the transformer core increases one opening of the existing transformer core to three openings, and the increased opening Some of them are exposed outside the coil, which is obvious, which facilitates the insertion of the iron core, improves the efficiency of the iron core insertion, reduces the labor cost, and increases the iron core after the opening by dispersing the opening position, so that the vibration is reduced, and the noise is The improvement further improves the anti-burst short-circuit capability of the iron core, and at the same time, the openings on the single-ring material frame frame forming the outer third-length tape set are located in the columnar space extending upward along the core of the transformer core. Convenient for the coil set, so that the coil will not get stuck when it is placed on the outside of the transformer core from top to bottom.

As the number of single-ring material frames increases, in order to better realize the effect of locking between the tape groups and the tape groups, as a technical solution improvement, the middle layer of the inner-frame single-frame iron core 1 is formed. 4 and/or the outer strip group 5 is a plurality of groups, and the middle layer strip groups 4 of each group are sequentially stacked, and the outer layer strip groups 5 of each group are sequentially stacked; the middle layer strips constituting the outer ring single-frame iron core 2 The group 4 and/or the outer layer belt group 5 are a plurality of groups, and the layer belt groups 4 in each group are sequentially stacked, and the outer layer belt groups 5 of each group are sequentially stacked.

As shown in FIG. 1, FIG. 3, FIG. 5, FIG. 7 and FIG. 9, eight single-loop strips constituting the inner layer strip group 3, the middle layer strip group 4 and the outer layer strip group 5 are arranged correspondingly with eight A bending angle of 135 degrees, that is, four bending bevels are arranged on each single ring material frame.

As shown in FIG. 2, FIG. 4, FIG. 6, FIG. 8 and FIG. 10, 12 single-row strip frames constituting the inner layer strip group 3, the middle layer strip group 4 and the outer layer strip group 5 are correspondingly arranged. A bend angle of 150 degrees, that is, eight bend bevels are placed on each single-ring strip frame.

When eight bending bevels are provided on the single-ring belt frame constituting the transformer core, as shown in FIGS. 8 and 10, the middle second tape group 42 and the outer second tape group 52 respectively include a plurality of openings. a single-ring strip frame symmetrically disposed on the first bending slope and a plurality of single-ring strip frames stacked on the first bending slope symmetrically on the outer side of the opening and symmetrically disposed on the second bending slope Single-ring material frame, wherein the first bending slope is located between the single-frame iron core stud 11 and the single-frame iron core upper yoke 12 And one end is connected to the single-frame iron core stud 11 , and two ends of the second bending inclined surface are respectively connected with the first bending inclined surface and the single-frame iron core upper yoke 12 .

As an improvement of the technical solution, as shown in FIG. 5 to FIG. 10, the opening positions of the single-ring strips constituting the inner layer strip group 3, the middle layer strip group 4 and the outer layer strip group 5 are all stepped. The stacking is arranged in such a way that the iron loss of the transformer core due to the opening structure is minimized, and the mechanical strength of the transformer core is strengthened and improved.

As a modification of the technical solution, the cross section of the transformer core stud 6 is oblong (as shown in FIG. 11) or a circle-inscribed polygon (as shown in FIG. 12) or a stepped type (as shown in FIG. 13) or a rectangle. (as shown in Figure 14) or a circle like this (as shown in Figure 15).

The specific embodiments of the present invention are written in a progressive manner, with emphasis on the differences of the various embodiments, and similar parts thereof can be referred to each other.

The embodiments of the present invention have been described in detail above with reference to the drawings, but the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the invention. Kind of change.

Claims

Folding planar three-phase open transformer core consisting of two inner ring single-frame iron cores (1) and one outer ring single-frame iron core (2) stacked on the outer side of the inner ring single-frame iron core (1) The inner ring single-frame iron core (1) and the outer ring single-frame iron core (2) each comprise a single-frame iron core column (11), a single-frame iron core upper yoke (12), and a single-frame iron core lower yoke. (13) and a bending slope (14), characterized in that the inner ring single-frame iron core (1) and the outer ring single-frame iron core (2) are both composed of an inner layer belt group (3) and a middle layer belt group ( 4) and the outer strip group (5) are sequentially stacked, and the middle strip group (4) includes a middle first strip group (41) and is stacked on the outer side of the middle first strip group (41). The middle second tape set (42), the outer tape set (5) includes an outer first tape set (51), and an outer layer stacked on the outer side of the outer first tape set (51) a second tape set (52) and an outer third tape set (53) stacked on the outer side of the outer second tape set (52), wherein the inner layer set (3), the middle layer The first belt group (41) and the outer first belt group (51) are respectively formed by stacking a plurality of openings in a single ring frame at the upper end of the single-frame iron core column (11), and the middle layer is Two materials The group (42) and the outer second belt group (52) are respectively symmetrically disposed by a plurality of openings in a bending slope between the single-frame core core (11) and the single-frame core upper yoke (12) (14) The single ring material is stacked in a frame, and the outer third tape group (53) is symmetrically arranged by a plurality of openings on the two ends of the single frame core upper yoke (12). The distance between the opening on each single-ring strip frame and the bending angle located on the same side of the opening is ≥5 mm, and the single-ring material forming the outer third belt group (53) The openings in the frame are all located in the columnar space extending upward along the transformer core stud (6), wherein the transformer core stud (6) consists of the inner ring single-frame iron core (1) and the outer ring single The single-frame iron core column (11) of the frame iron core (2) is assembled.
The folded planar three-phase open transformer core according to claim 1, characterized in that: an intermediate layer set (4) and/or an outer strip set (5) constituting the inner ring single-frame iron core (1) For multiple groups, and the middle layer belt groups (4) of each group are stacked in turn, the outer layer belt groups (5) of each group are stacked in turn; the middle layer belt group (4) constituting the outer ring single frame iron core (2) And/or the outer material belt group (5) is a plurality of groups, and the middle material belt groups (4) in each group are sequentially stacked, and the outer material belt groups (5) of each group are sequentially stacked.
The folded planar three-phase open transformer core according to claim 1, characterized in that: a single turn of the inner layer strip set (3), the middle layer strip set (4) and the outer layer strip set (5) There are eight 135 degree bend angles on the strip frame.
The folded planar three-phase open transformer core according to claim 1, characterized in that: a single turn of the inner layer strip set (3), the middle layer strip set (4) and the outer layer strip set (5) There are 12 150 degree bend angles on the strip frame.
The folded planar three-phase open transformer core according to claim 4, wherein the middle second tape set (42) and the outer second tape set (52) respectively comprise a plurality of openings symmetrically disposed at a single-ring strip frame on a curved inclined surface and a plurality of single-ring strips stacked on the outer side of the single-turn strip frame symmetrically disposed on the first bending inclined surface and symmetrically disposed on the second bending inclined surface a frame, wherein the first bending slope is located between the single-frame iron core column (11) and the single-frame iron core upper yoke (12), and one end is connected with the single-frame iron core column (11), and the second bending slope is The two ends are respectively connected to the first bending slope and the single-frame iron core upper yoke (12).
The folded planar three-phase open transformer core according to claim 1, characterized in that: a single turn of the inner layer strip set (3), the middle layer strip set (4) and the outer layer strip set (5) The opening positions of the opening of the strip frame are arranged in a staggered manner in a stepped compartment.
The folded planar three-phase open transformer core according to any one of claims 1 to 6, wherein the transformer core stud (6) has an oblong or round-like inscribed polygon or stepped shape. Or a rectangle or a circle.