CN112466633A

CN112466633A - Foil wound transformer

Info

Publication number: CN112466633A
Application number: CN202011249478.XA
Authority: CN
Inventors: 郑程介; 李国财; 田胜利; 肖明亮
Original assignee: Foshan Ouli Electronic Co ltd
Current assignee: Foshan Ouli Electronic Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-03-09
Anticipated expiration: 2040-11-10
Also published as: WO2022099791A1; CN112466633B

Abstract

Foil-wound transformer relates to transformer technical field. Foil-wound transformer, including transformer coil mould, primary coil, secondary coil, transformer coil mould is equipped with annular wire winding groove, primary coil and secondary coil all form in the winding inslot coiling, nested inside and outside primary coil and secondary coil, including primary coil, secondary coil is outside, primary coil is the foil formula coil, it includes range upon range of metal forming and insulating layer, this foil-wound transformer still includes insulating filling member, insulating filling member fills in the gap between primary coil both sides and transformer coil mould, in order to prevent sinking of secondary coil extremely the gap. The voltage resistance among the windings is prevented from being influenced by the sinking of the winding of the second-stage coil, so that the transformer burning accident is avoided, and the safety of the transformer is improved.

Description

Foil wound transformer

Technical Field

The invention relates to the technical field of transformers.

Background

Transformers are devices that change an alternating voltage using the principle of electromagnetic induction, and can be generally divided into wire-wound windings and foil windings according to the difference of winding conductor structures. The foil winding takes copper or aluminum foil strips with different thicknesses as conductors, takes a wide-strip-shaped insulating material as interlayer insulation and a narrow-strip-shaped insulating material as end insulation, and finishes winding on a foil winding machine at one time to form the foil coil.

When the existing foil winding transformer is used for winding a foil coil, the foil coil is generally wound around a wire slot of a transformer coil mold and is wound in the middle. However, in the existing foil winding, in order to facilitate winding, the left width and the right width of the foil coil are slightly smaller than the left width and the right width of the wire slot, so that gaps can be formed at the left side and the right side of the wire slot after the foil winding is completed, and when an enameled wire for winding a secondary coil is wound, the enameled wire is linear and can sink into the gaps, the voltage resistance between the windings is influenced, and the transformer is easy to burn and is not safe enough.

Disclosure of Invention

In view of the above, the present invention provides a foil-wound transformer with higher safety.

In order to achieve the purpose, the invention provides the following technical scheme.

1. Foil-wound transformer, including transformer coil mould, primary coil, secondary coil, transformer coil mould is equipped with annular wire winding groove, primary coil and secondary coil all form in the winding inslot coiling, nested inside and outside primary coil and secondary coil, including primary coil, secondary coil is outside, primary coil is the foil formula coil, it includes range upon range of metal forming and insulating layer, this foil-wound transformer still includes insulating filling member, insulating filling member fills in the gap between primary coil both sides and transformer coil mould, in order to prevent sinking of secondary coil extremely the gap. The voltage resistance among the windings is prevented from being influenced by the sinking of the winding of the second-stage coil, so that the transformer burning accident is avoided, and the safety of the transformer is improved.

2. The foil-wound transformer according to claim 1, wherein the insulating layer comprises NM paper for insulation.

3. The foil-wound transformer according to claim 1, further comprising a puncture-proof insulator, wherein a welding region for welding a lead is provided at the starting end and the ending end of the first-stage coil, and the puncture-proof insulator is provided between the welding region and the insulating layer stacked adjacent thereto to prevent burrs of the lead from puncturing the insulating layer. The short circuit caused by the fact that the burr of the lead penetrates through the insulating layer is avoided.

4. According to the foil-wound transformer of claim 4, the stab-resistant insulation member is made of red vulcanized paper.

5. According to technical scheme 1 the foil-wound transformer further comprises a winding fixing piece, wherein the winding fixing piece comprises an insulating tape, and the insulating tape is adhered to the starting position and the ending position of the first-stage coil to fix the first-stage coil.

6. According to the foil-wound transformer in the technical scheme 1, a winding insulating layer is further arranged between the first-stage coil and the second-stage coil, and the winding insulating layer comprises highland barley paper.

7. According to technical scheme 1 the foil-wound transformer, still including preventing the subassembly that sinks, the second level coil is formed by the wire winding one by one the ring successive layer, prevent that the subassembly that sinks includes the interlayer gasket, each corner between the inside and outside adjacent two-layer coil of second level coil all is equipped with the interlayer gasket to prevent intermixing between this inside and outside adjacent two-layer coil. The second-stage coil is formed by winding linear conducting wires one by one layer, and the inner and outer adjacent layers of coils are possibly embedded and mixed with each other, so that the second-stage coil is spread out more leftwards and rightwards, the structure is deformed, the risk that the second-stage coil sinks into gaps on the left side and the right side of the first-stage coil is increased, and the electrical performance of the transformer is possibly changed. The intermixture between the inside and outside adjacent two-layer coil appears at each corner usually, the wire is bent here, no matter be at the coiling or in the use, the wire here can all receive from outside-in's power, thereby outer coil extrudees the embedding inlayer coil easily and mixes with inlayer coil, set up the interlayer gasket here, can provide stable impetus for outer coil on the one hand, do benefit to outer coil holding position, but on the other hand separation outer coil extrusion embedding inlayer coil, thereby avoid intermixture between the inside and outside adjacent two-layer coil.

8. According to the foil-wound transformer in the technical scheme 7, the interlayer gasket is bent to form a corner, and the corner of the interlayer gasket is attached to the corners of two adjacent layers of coils inside and outside the second-stage coil. The coil corner extends to two directions, and the interlayer gasket is bent to form a corner which can be attached to the corner of the coil and slightly extends to the two directions, so that the coil extending to the two directions at the corner can be provided with an acting point, and the coil at the outer layer is prevented from being inwards extruded and embedded into the coil at the inner layer in the two directions.

Drawings

FIG. 1 is an angled cross-sectional view of a foil-wound transformer of the present invention;

FIG. 2 is a cross-sectional view of another angle of a foil-wound transformer of the present invention;

FIG. 3 is a schematic diagram of a foil coil of the foil-wound transformer of the present invention;

FIG. 4 is a schematic view of a partial structure of a welding area of a foil-wound transformer according to the present invention;

FIG. 5 is a schematic diagram of a partial structure at a corner of a second stage coil of the foil-wound transformer of the present invention;

FIG. 6 is another partial schematic diagram of a corner of a second stage coil of a foil-wound transformer according to the present invention;

the reference numerals include:

a transformer coil mold 1;

the secondary coil 2, the inner coil 21, the outer coil 23, the anti-sinking component 22 and the interlayer gasket 221;

a winding insulation layer 3;

an insulating filler 4;

a primary coil 5, a metal foil 51, an insulating layer 52, and a stab-resistant insulating member 53.

Detailed Description

The invention is described in detail below with reference to specific embodiments.

As shown in fig. 1 and 2, the foil-wound transformer of this embodiment includes a transformer coil mold 1, a first-stage coil 5, a second-stage coil 2, an insulating filler 4, and a winding insulating layer 3, where the transformer coil mold 1 is provided with an annular winding slot, the first-stage coil 5 and the second-stage coil 2 are nested inside and outside, the first-stage coil 5 is inside, the second-stage coil 2 is outside, and the first-stage coil 5 and the second-stage coil 2 are isolated by the winding insulating layer 3. The primary coil 5 is a foil coil, and the winding insulation layer 3 comprises highland barley paper. However, when the foil coil is wound, the foil coil is generally wound around the wire slot of the transformer coil mold 1, and is wound in the middle, and meanwhile, the left width and the right width of the foil coil are slightly smaller than the left width and the right width of the wire slot, so that gaps are formed at the left side and the right side of the wire slot. The insulating filling part 4 comprises a Mala adhesive tape, and the insulating filling part 4 is arranged on two sides of the transformer to fill gaps formed on two sides when the foil-wound coil is wound. The insulating filling member 4 can prevent the winding of the second-stage coil 2 from sinking into the gap when the second-stage coil 2 is wound, and can effectively prevent the transformer burning caused by the sinking of the winding of the second-stage coil 2 into the gap.

The foil coil is constructed as shown in fig. 3, and includes a metal foil 51, an insulating layer 52, and a winding fixture. The foil coil is formed by laminating and winding a metal foil 51 and an insulating layer 52, wherein the metal foil 51 comprises a copper foil or an aluminum foil, and the insulating layer 52 comprises NM paper. The winding mounting includes the agala sticky tape, and the agala sticky tape pastes the setting at the beginning of first order coil 5 and second level coil 2 and ends the department to fixed winding first order coil 5.

As shown in fig. 4, the foil-wound transformer further includes a penetration preventing insulator 53 provided with a welding region for welding a lead wire at a start end and an end of the metal foil 51 of the primary coil 5, and the penetration preventing insulator 53 includes a red vulcanized paper disposed between the welding region of the metal foil 51 and the insulating layer 52 to prevent a short circuit caused by a burr penetrating the insulating layer 52 on the welded lead wire. Meanwhile, the red vulcanized paper is a high-temperature-resistant heat-insulating material, so that the lead and the insulating layer 52 can be isolated, and the insulating layer 52 is prevented from being burnt out due to the heating of the lead.

As shown in fig. 5, the foil-wound transformer further includes a sinking prevention assembly 22, the second-stage coil 2 is formed by winding a conducting wire layer by layer, the sinking prevention assembly 22 includes an interlayer gasket 221, and the interlayer gasket 221 is disposed at each corner between the inner and outer adjacent two layers of coils of the second-stage coil 2 to isolate the inner coil 21 and the outer coil 23, so as to prevent the inner and outer adjacent two layers of coils from mixing with each other. The secondary coil 2 is formed by winding a linear conducting wire coil by coil layer by layer, and the inner and outer adjacent two layers of coils are possibly embedded and mixed with each other, so that the secondary coil 2 is spread out more left and right, the structure is deformed, the risk that the secondary coil 2 sinks into gaps on the left and right sides of the primary coil 5 is increased, and the electrical performance of the transformer is possibly changed. Intermixing between the adjacent two-layer coil of inside and outside appears in each corner usually, the wire is bent here, no matter be at the coiling or in the use, the wire all can receive outside-in's power here, thereby outer coil 23 extrudes easily and imbeds inlayer coil 21 and mixes with inlayer coil 21, set up interlayer gasket 221 here, can provide stable impetus for outer coil 23 on the one hand, do benefit to outer coil 23 holding position, on the other hand can separate outer coil 23 extrusion and imbed inlayer coil 21, thereby avoid intermixing between the adjacent two-layer coil of inside and outside.

As shown in fig. 6, the spacer 221 is bent to form a corner, and the corner of the spacer 221 is attached to the corners of the two adjacent coils inside and outside the second-stage coil. The corners of the coil extend towards two directions, and the interlayer gasket 221 is bent to form corners which can be attached to the corners of the coil and also slightly extend towards the two directions, so that the coil extending towards the two directions from the corners can provide an acting point, and the coil 23 on the outer layer is prevented from being inwards pressed and embedded into the coil 21 on the inner layer in the two directions.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. Foil-wound transformer, including transformer coil mould, primary coil, secondary coil, transformer coil mould is equipped with annular wire winding groove, primary coil and secondary coil all form in the winding inslot coiling, nested inside and outside primary coil and secondary coil, including primary coil, secondary coil is outside, primary coil is the foil formula coil, it includes range upon range of metal forming and insulating layer, characterized by, this foil-wound transformer still includes insulating filling member, insulating filling member fills in the gap between primary coil both sides and transformer coil mould, in order to prevent sinking of secondary coil extremely the space.

2. The foil-wound transformer of claim 1, wherein the insulating layer comprises NM paper for insulation.

3. The foil-wound transformer of claim 1 further comprising a puncture-proof insulator, wherein the starting end and the ending end of the first-stage winding are provided with a welding region for welding a lead, and the puncture-proof insulator is disposed between the welding region and the insulating layer stacked adjacent thereto to prevent a burr of the lead from puncturing the insulating layer.

4. A foil-wound transformer according to claim 4, wherein the stab-resistant insulation is made of red vulcanized paper.

5. The foil-wound transformer of claim 1, further comprising a winding fixture, the winding fixture comprising insulating tape, the insulating tape being adhesively disposed at the beginning and end of the first stage winding to secure the first stage winding.

6. The foil-wound transformer of claim 1, further comprising a winding insulation layer between the primary winding and the secondary winding, the winding insulation layer comprising highland barley paper.

7. The foil-wound transformer of claim 1 further comprising a sag prevention assembly, wherein the secondary winding is formed by winding the conductive wire from winding to winding, the sag prevention assembly comprises an interlayer gasket, and the interlayer gasket is disposed at each corner between two adjacent inner and outer windings of the secondary winding to prevent the two adjacent inner and outer windings from mixing with each other.

8. The foil-wound transformer of claim 7, wherein the spacer is bent to form corners, the corners of the spacer engaging the corners of the adjacent inner and outer layers of the second stage winding.