CN109950040B

CN109950040B - Method for manufacturing cone-shaped glue-free secondary coil based on wet forming process and coil

Info

Publication number: CN109950040B
Application number: CN201910181108.8A
Authority: CN
Inventors: 潘亚峰; 刘胜; 王俊杰; 王刚; 王利民; 孙旭; 樊旭亮; 范红艳; 郭旭; 牛耀辉; 赵健; 杨鑫; 张皓
Original assignee: Northwest Institute of Nuclear Technology
Current assignee: Northwest Institute of Nuclear Technology
Priority date: 2019-03-11
Filing date: 2019-03-11
Publication date: 2021-01-05
Anticipated expiration: 2039-03-11
Also published as: CN109950040A

Abstract

The invention relates to a secondary coil of a high-voltage pulse transformer. Aiming at the defects of complicated manufacturing process and long manufacturing cycle of the existing glue-free secondary coil, resulting in low practicability and difficulty in meeting actual work requirements, a manufacturing method based on a wet forming process is provided. A method for a tapered glueless secondary coil and the same. Wherein, a method for manufacturing a conical glue-free secondary coil based on a wet forming process includes the following steps: 1) making a paper inner cone by a wet forming process; 2) winding a thin wire diameter winding on the paper inner cone 3) Shape the outer surface of the paper inner cone; specifically, pour water on the paper inner cone that has been wound with a fine wire diameter for several minutes to make the paper inner cone The outer surface expands and deforms towards the inner triangular area between adjacent turns of the coil winding intermediate layer to form a wavy contact surface; 4) A paper outer cone is made on the coil winding intermediate layer through a wet forming process; Surface shaping; 5) Remove the conical base cylinder.

Description

Method for manufacturing cone-shaped glue-free secondary coil based on wet forming process and coil

Technical Field

The invention relates to a secondary coil of a high-voltage pulse transformer, in particular to a method for manufacturing a conical glue-free secondary coil based on a wet forming process and the coil.

Background

The Russian Sinus series high-voltage pulse generator adopts a compact structure with a high-coupling transformer with an open-circuit magnetic core and a coaxial forming wire.

The primary coil and the secondary coil of the transformer are embedded in the coaxial pulse forming line; the secondary coil has the characteristics of thin wire diameter and multiple turns, and is arranged between an inner magnetic core and an outer magnetic core which form a wire.

The commonly used secondary coil takes an electrical paper board as a base cylinder, and a thin-wire-diameter conducting wire is wound and fixed on the paper base cylinder in a curing glue adhesion mode, wherein a curing glue layer of the adhesive coil has tiny air bubbles. In the process of charging the secondary coil, the inner magnetic core is at a high potential, and two ends of the secondary coil bear high voltage; at the moment, the electric field in the air gap in the glue layer is obviously enhanced, and the phenomenon of gas discharge is easy to occur, so that the coil is burnt, and the transformer cannot work normally.

In the prior art, high-voltage insulation performance of a medium is improved by loading high air pressure on a formed line medium; however, the high pressure cannot improve the normal pressure form of the microbubbles in the cured gel layer, and the bubbles in the gel layer are still easy to have high voltage breakdown.

The secondary coil of the non-glue type conical high-voltage pulse transformer (application number: ZL201510381708.0) disclosed by the Chinese patent provides a non-glue coil structure, which solves the problem of gas discharge caused by a gluing process in the existing conical secondary coil manufacturing, improves the turn-to-turn insulation performance of the coil and ensures the integral insulation strength of the conical secondary coil. However, the coil adopts the fishing line to fix the winding, so that the manufacturing process is complicated, and the manufacturing period is long for ensuring the uniformity of the winding; therefore, the practicability is not high, and the actual working requirement is difficult to meet.

Disclosure of Invention

The invention aims to overcome the defects that the prior non-glue secondary coil has complex manufacturing process and longer manufacturing period, causes low practicability and is difficult to meet the actual working requirement, and provides a method for manufacturing a conical non-glue secondary coil based on a wet forming process and the coil.

In order to achieve the purpose, the technical scheme provided by the invention is as follows: the method for manufacturing the cone-shaped non-glue secondary coil based on the wet forming process is characterized by comprising the following steps of:

1) making paper inner cone

Manufacturing a paper inner cone cylinder on the conical base cylinder through a wet forming process;

the wet forming process is a mature process applied to an insulating structural member of a power transformer, and the specific method is that a plurality of layers of wet paper are externally coated on a base cylinder, then tightening belts are bound, and the solid paper component with certain mechanical strength is finally formed after high-temperature drying for a certain time.

2) Manufacturing coil winding middle layer

Winding fine wire diameter winding on the paper inner cone to manufacture a coil winding middle layer;

3) paper inner cone outer surface shaping

Spraying water on the paper inner cone wound with the fine-wire-diameter winding wire for several minutes to enable the outer surface of the paper inner cone to expand and deform towards an inner triangular area between adjacent turns of the coil winding middle layer, and the outer surface of the paper inner cone forms a wavy contact surface in a high-temperature drying process of wet forming;

4) making paper external cone and shaping its internal surface

Manufacturing a paper outer cone cylinder on the coil winding intermediate layer by using the coil winding intermediate layer as a substrate through a wet forming process;

in the process of manufacturing the paper outer cone, the inner surface of the paper outer cone contracts and deforms towards the outer triangular area between adjacent turns of the coil winding middle layer, and a wavy contact surface is formed in the high-temperature drying process of wet forming of the paper outer cone;

5) the conical base cylinder is removed.

In addition, the invention also provides a conical glue-free secondary coil which is characterized by comprising a paper inner cone, a coil winding middle layer and a paper outer cone, wherein the paper inner cone, the coil winding middle layer and the paper outer cone are coaxial and tightly attached from inside to outside; the outer contact surface of the paper inner cone cylinder tightly attached to the coil winding middle layer and the inner contact surface of the paper outer cone cylinder tightly attached to the coil winding middle layer are wavy.

Furthermore, the coil winding middle layer is formed by winding fine wire diameter windings on the outer surface of the paper inner cone, the drying temperature of wet forming is about 90-110 ℃, and the fine wire diameter windings are enameled wires or three layers of insulating wires which can resist the high temperature of 110 ℃ and above.

Further, the outside diameter of the fine wire diameter winding is about 0.3 to 2 mm.

Compared with the prior art, the invention has the advantages that:

1. the cone-shaped secondary coil adopts the wet-formed paper tube to fix the coil winding instead of the traditional mode of fixing the winding by glue, realizes the glue-free mode, and solves the problems of long service life and high reliability of the cone-shaped high-voltage secondary coil in the pulse transformer.

2. The invention adopts the wavy contact surface, plays a role in fixing the coil middle layer along the conical surface direction and the radial direction, and can effectively realize the fixation of the coil middle layer.

3. The conical secondary coil has simple structure, uniform winding and good turn-to-turn insulation; and is easy to realize, and has a short manufacturing period.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a tapered secondary coil of the present invention;

the reference numerals in the drawings are explained as follows:

1-paper outer cone;

2-coil winding middle layer;

3, paper inner cone cylinder;

4-conical base cylinder.

Detailed Description

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

The embodiment provides a conical non-glue secondary coil, which is of a thin-wall conical cylinder structure integrally and comprises a paper inner conical cylinder 3, a coil winding middle layer 2 and a paper outer conical cylinder 1, wherein the paper inner conical cylinder 3, the coil winding middle layer 2 and the paper outer conical cylinder are coaxial and tightly attached from inside to outside; the outer contact surface of the paper inner cone cylinder 3 tightly attached to the coil winding middle layer 2 and the inner contact surface of the paper outer cone cylinder 1 tightly attached to the coil winding middle layer 2 are wavy. The wavy contact surface plays a role in fixing the coil middle layer along the conical surface direction and the radial direction.

The coil winding middle layer 2 is formed by winding fine wire diameter windings with the outer diameter of 0.34mm on the outer surface of the paper inner cone 3, and the fine wire diameter windings are enameled wires or three layers of insulating wires which can resist the high temperature of 110 ℃ and above due to the fact that the drying temperature of wet forming is about 90-110 ℃.

The implementation also discloses a method for manufacturing the conical glue-free secondary coil, which comprises the following specific steps:

1) making a paper inner cone 3

Manufacturing a paper inner cone cylinder 3 on an aluminum conical base cylinder 4 by a wet forming process; the depth of the conical surface inner sunken groove on the surface of the paper inner cone 1 is 1.5mm, and the width and the depth of the spiral grooves at two ends are 0.5mm and 0.5 mm.

2) Manufacture of coil winding intermediate layer 2

Winding a thin-wire-diameter winding on a paper inner cone 3 to manufacture a coil winding intermediate layer 2; the fine wire diameter winding is an enameled wire with the outer diameter of 0.34 mm.

3) Paper inner cone 3 outer surface shaping

Spraying water on the paper inner cone 3 wound with the fine-wire-diameter winding wire for several minutes, keeping the winding wire unchanged, enabling the outer surface of the paper inner cone 3 to expand and deform towards an inner triangular area between adjacent turns of the coil winding middle layer 2, and enabling the outer surface of the paper inner cone 3 to form a wavy contact surface in a wet-forming high-temperature drying process;

4) making paper outer cone 1 and setting its inner surface

The coil winding middle layer 2 is used as a substrate, and a paper outer cone 1 is manufactured on the coil winding middle layer 2 through a wet forming process;

in the process of manufacturing the paper outer cone 1, the inner surface of the paper outer cone is contracted and deformed towards the outer triangular area between adjacent turns of the coil winding middle layer 2, and the inner surface of the paper outer cone 1 forms a wavy contact surface in the high-temperature drying process of wet forming;

5) a wire stripping groove is formed at the small end of the paper inner cone 3, and the wire end of the fine wire diameter winding is adjusted; removing the conical base cylinder 4; a wire stripping groove is formed in the inner side of the large end of the paper outer cone 1, and the wire end of the wire with the small wire diameter is adjusted; and an oil hole is formed.

The above embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and other modifications are possible within the scope of the invention. It is to be understood that any obvious alternative is within the scope of the invention without departing from the inventive concept.

Claims

1. a method for manufacturing a conical glue-free secondary coil based on a wet forming process, characterized in that, comprising the steps:

1) Make paper inner cone (3)

On the conical base cylinder (4), a paper inner cone (3) is made by a wet forming process;

2) Making the coil winding intermediate layer (2)

Winding the thin wire diameter winding on the paper inner cone (3) to make the coil winding intermediate layer (2);

3) Paper inner cone (3) Outer surface shaping

Sprinkle water on the paper inner cone (3) that has been wound with a fine wire diameter for several minutes, so that the outer surface of the paper inner cone (3) faces the inner triangle between the adjacent turns of the coil winding intermediate layer (2). zone expansion and deformation;

And the outer surface of the paper inner cone (3) forms a wavy contact surface during the high-temperature drying process of wet forming;

4) Make a paper outer cone (1) and shape its inner surface at the same time

Using the coil winding intermediate layer (2) as a base, a paper outer cone (1) is produced on the coil winding intermediate layer (2) by a wet forming process;

In the process of making the paper outer cone (1), its inner surface is compressed and deformed toward the outer triangular area between the adjacent turns of the coil winding intermediate layer (2);

And the inner surface of the paper outer cone (1) forms a wavy contact surface during the high-temperature drying process of wet forming;

5) Remove the conical base barrel (4).

2. A tapered glue-free secondary coil prepared by using the method for manufacturing a tapered glue-free secondary coil based on a wet forming process according to claim 1, characterized in that: it comprises a coaxial and close fit from the inside to the outside. The paper inner cone (3), the coil winding middle layer (2) and the paper outer cone (1);

The outer contact surface of the paper inner cone (3) and the coil winding intermediate layer (2) closely adhered, and the inner contact surface of the paper outer cone (1) and the coil winding intermediate layer (2) closely adhered to each other. wavy.

3. The conical glue-free secondary coil according to claim 2, characterized in that: the coil winding intermediate layer (2) is made by winding a thin wire diameter winding on the outer surface of the paper inner cone (3). , The thin wire diameter winding adopts the enameled wire or three-layer insulated wire resistant to high temperature of 110 ℃ and above.

4 . The tapered glue-free secondary coil according to claim 3 , wherein the outer diameter of the thin wire diameter winding is 0.3-2 mm. 5 .