CN211828417U

CN211828417U - Transformer core unit and iron core

Info

Publication number: CN211828417U
Application number: CN202020467703.6U
Authority: CN
Inventors: 胡石林
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-27
Filing date: 2020-04-02
Publication date: 2020-10-30
Anticipated expiration: 2030-04-02

Abstract

The utility model discloses a transformer core unit and iron core, the iron core unit is formed by a plurality of iron core layers laminating, and every iron core layer is enclosed by two indisputable yoke iron sheets and two iron column iron sheets, and the distribution that staggers of joint seam between indisputable yoke iron sheet and the iron column iron sheet in indisputable yoke iron sheet and the even number layer iron core layer in the indisputable core layer of odd number layer and the connection seam between the iron column iron sheet. Since the technical scheme is used, compare with prior art, the utility model discloses a can not form a neat tangent plane between iron core and the iron core post, overlap joint each other between odd number layer iron core layer and the even number layer iron core layer, connection stability is showing and is improving, is difficult for producing the clearance between iron core and the iron core post.

Description

Transformer core unit and iron core

Technical Field

The utility model relates to a transformer equipment technical field, concretely relates to transformer core unit and iron core.

Background

The iron core of the transformer is a main magnetic circuit part in the transformer, the magnetic circuit of the iron core is very small, a strong induction magnetic field can be obtained through the iron core, and the iron core and a coil wound on the iron core form a complete electromagnetic induction system. The iron core comprises an iron core column sleeved with a coil and an iron yoke which does not sleeve the coil and only plays a role of closing a magnetic circuit, wherein the iron core column is formed by overlapping a plurality of iron core column iron sheets, the iron yoke is formed by overlapping a plurality of iron yoke iron sheets so as to form a hollow iron core structure, the coil is provided with two or more than two windings, the winding connected with a power supply is a primary coil, and the rest windings are secondary coils.

The three-phase transformer is formed by three single-phase transformers, and the main flux of each phase must be closed by the magnetic circuits of the other two phases, so that the three-phase magnetic circuits are related to each other. The iron core of a general three-phase transformer is in a plane structure, the lengths of magnetic circuits of three phases are different, the magnetic circuit of one phase in the middle is short, and the magnetic circuits of the other two phases are long, so that the magnetic resistance of the three phases is slightly different. When three-phase symmetrical voltage is applied externally, three-phase no-load current is unequal, the lengths of magnetic circuits are different, the directions of the magnetic circuits are different, the current of one phase in the middle is small, and the current of the other two phases is large, so that the load operation of the transformer is influenced, and a part of loss is caused.

In order to overcome the above-mentioned drawbacks, chinese patent publication No. CN110459385A discloses a transformer and an iron core thereof, in which an iron yoke is transformed into a "Y" type structure, and each side of the "Y" type structure is formed by overlapping a plurality of bent iron yoke iron sheets side by side, thereby solving the problem of symmetry of magnetic circuits. The disadvantages are that: as shown in fig. 1, at the joints of all the yoke iron sheets 1 and the core limb iron sheets 2, the joint seam is located on the diagonal line 6 of the joint, so that a very regular tangent plane (as shown in fig. 2) is formed between the core and the core limb, resulting in insufficient connection stability between the core and the core limb, and a gap is easily generated between the core and the core limb, thereby easily causing magnetic leakage.

SUMMERY OF THE UTILITY MODEL

For solving the problem that current transformer core connected mode makes the clearance produce between iron core and the iron core post easily among the background art, the utility model provides a transformer core unit, concrete technical scheme as follows.

The utility model provides a transformer core unit, the iron core unit is laminated by a plurality of iron cores and forms, and every iron core layer is enclosed by two indisputable yoke iron sheets and two iron column iron sheets, and the distribution is staggered to the joint seam between indisputable yoke iron sheet and the iron column iron sheet among the indisputable core layer of odd number layer and the even number layer iron core layer.

From this, can not form a neat tangent plane between iron core and the iron core post, overlap joint each other between odd number layer iron core layer and the even number layer iron core layer, connection stability is showing and is improving, is difficult for producing the clearance between iron core and the iron core post.

Preferably, a plane where a certain iron column iron sheet is located is defined as a projection plane; defining the projection of a connecting line between an outer angular point (A) and an inner angular point (B) on each corner of the iron core layer on the projection plane as a diagonal line (OO'); the connecting seam between the iron yoke iron sheet and the iron column iron sheet in the odd number layer of iron core layer of definition is in projection on the projection plane is first connecting seam projection line, and the connecting seam between the iron yoke iron sheet and the iron column iron sheet in the even number layer of iron core layer of definition is in projection on the projection plane is second connecting seam projection line, first connecting seam projection line and second connecting seam projection line are located respectively the both sides of diagonal (OO').

Preferably, the first and second joining seam projection lines are symmetrically distributed about the diagonal line (OO').

Preferably, the starting ends of the connecting seams between all the iron yoke iron sheets and the iron column iron sheets are located at the inner corner point (B) of the iron core layer corresponding to the connecting seam. The starting end is one end of the connecting seam close to the center of the iron core layer.

Preferably, the angle between the projection line of the first joining line and the projection line of the second joining line is less than or equal to 90 °.

Preferably, the included angle is 20 °.

Based on the same inventive concept, the utility model also provides a transformer core, it is formed by the combination of three above-mentioned transformer core units.

Preferably, the upper surface and the lower surface of the transformer core are both planar. Thereby, the transformer core can be placed more stably.

Owing to adopted above technical scheme, compare with prior art, the utility model discloses a can not form a neat tangent plane between iron core and the iron core post, overlap joint each other between odd number layer iron core layer and the even number layer iron core layer, connection stability is showing and is improving, is difficult for producing the clearance between iron core and the iron core post.

Drawings

FIG. 1 is a schematic structural diagram of a conventional transformer core;

FIG. 2 is a schematic structural diagram of a top core of a conventional transformer;

fig. 3 is a schematic structural diagram of an iron core in embodiment 1 of the transformer of the present invention;

fig. 4 is a schematic structural view of a joint between an iron core and an iron core column in an iron core unit of a transformer in embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a joint between an outermost core and a core column in a transformer core unit according to embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of an iron core in embodiment 2 of the present invention;

fig. 7 is a schematic structural diagram of a joint between an iron core and an iron core column in an iron core unit of a transformer according to embodiment 2 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1

As shown in fig. 3, a transformer core is formed by combining three transformer core units 31. The transformer core unit 31 is formed by overlapping a plurality of iron core layers 4, and each iron core layer 4 is enclosed by two iron yoke iron sheets and two iron column iron sheets. The area a in the figure is the junction of the core and the core limb.

As shown in fig. 4, the connecting seam 51 between the iron yoke iron piece 411 and the iron column iron piece 412 in the odd-numbered iron core layers and the connecting seam 52 between the iron yoke iron piece 421 and the iron column iron piece 422 in the even-numbered iron core layers are distributed in a staggered manner.

As shown in fig. 4 and 5, defining a plane where a certain iron column iron sheet is located as a projection plane (taking an outermost iron column iron sheet as an example), and defining a projection of a connecting line between an outer corner point (a) and an inner corner point (B) on each corner of an iron core layer on the projection plane as a diagonal line (OO'); the projection of a connecting seam (51) between an iron yoke iron sheet (411) and an iron column iron sheet (412) in an odd number of iron core layers on the projection surface is defined as a first connecting seam projection line, and the projection of a connecting seam (52) between an iron yoke iron sheet (421) and an iron column iron sheet (422) in an even number of iron core layers on the projection surface is defined as a second connecting seam projection line. And the starting ends of the connecting seams between all the iron yoke iron sheets and the iron column iron sheets are all positioned at the inner angular point (B) of the iron core layer corresponding to the connecting seam. The first connecting seam projection line and the second connecting seam projection line are symmetrically distributed on two sides of the diagonal line (OO'), and an included angle between the first connecting seam projection line and the second connecting seam projection line is 20 degrees.

Example 2

As shown in fig. 6 and 7, the present embodiment is substantially the same as embodiment 1 except that the cross section of the upper and lower yokes in embodiment 1 is circular, while the lower half area of the cross section of the upper yoke in embodiment 2 is semicircular and the upper half area is rectangular, thereby forming a plane on the upper surface of the upper yoke; the upper half area of the cross section of the lower iron yoke is semicircular, and the lower half area of the cross section of the lower iron yoke is rectangular, so that a plane is formed on the lower surface of the lower iron yoke. By the design, the transformer core can be placed more stably.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. The utility model provides a transformer core unit, the core unit is laminated by a plurality of iron cores and forms, and every iron core layer is enclosed its characterized in that by two indisputable yoke iron sheets and two iron column iron sheets: the connecting seams between the iron yoke iron sheets and the iron column iron sheets in the odd number of iron core layers and the connecting seams between the iron yoke iron sheets and the iron column iron sheets in the even number of iron core layers are distributed in a staggered manner.

2. The transformer core unit of claim 1, wherein: defining a plane where a certain iron column iron sheet is located as a projection plane; defining the projection of a connecting line between an outer angular point (A) and an inner angular point (B) on each corner of the iron core layer on the projection plane as a diagonal line (OO'); the connecting seam between the iron yoke iron sheet and the iron column iron sheet in the odd number layer of iron core layer of definition is in projection on the projection plane is first connecting seam projection line, and the connecting seam between the iron yoke iron sheet and the iron column iron sheet in the even number layer of iron core layer of definition is in projection on the projection plane is second connecting seam projection line, first connecting seam projection line and second connecting seam projection line are located respectively the both sides of diagonal (OO').

3. The transformer core unit of claim 2, wherein: the first and second seam projection lines are symmetrically distributed about the diagonal (OO').

4. A transformer core unit according to any one of claims 1-3, characterized in that: the starting ends of the connecting seams between all the iron yoke iron sheets and the iron column iron sheets are all positioned at the inner angular point (B) of the iron core layer corresponding to the connecting seam.

5. A transformer core unit according to claim 2 or 3, characterized in that: the included angle between the projection line of the first connecting seam and the projection line of the second connecting seam is smaller than or equal to 90 degrees.

6. The transformer core unit of claim 5, wherein: the included angle is 20 °.

7. A transformer core, characterized by: which is assembled from three transformer core units according to any one of claims 1-6.

8. The transformer core of claim 7, wherein: the upper surface and the lower surface of the transformer iron core are both planes.