CN210200538U

CN210200538U - Mold for reducing air holes in inner surface of cast coil

Info

Publication number: CN210200538U
Application number: CN201921365272.6U
Authority: CN
Inventors: Liangang Qiu; 邱连刚; Xinjun Wang; 王新军
Original assignee: Yantai Tianneng Electric Technology Co Ltd
Current assignee: Yantai Tianneng Electric Technology Co Ltd
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2020-03-27
Anticipated expiration: 2029-08-22

Abstract

The utility model provides a reduce mould of pouring coil internal surface gas pocket, including the centre form, the centre form is at the surface scribbles the release agent, and centre form mesopore ann has the coiling machine main shaft, and the centre form top is equipped with the overhead gage, and the below is equipped with down the baffle, from the first lap winding alkali-free no wax glass fiber tape of centre form of baffle department down, lap winding width account for more than 1/2 of centre form at least, lap winding height is more than 3/4 of coil height at least. The utility model discloses an interior mould surface is half lap winding one deck alkali-free and wax-free glass fiber tape, utilizes the capillary fiber in glass fiber tape to pierce the bubble under the vacuum environment, can not form effective bubble between the surperficial net cloth of interior mould, has improved the pouring quality of pouring coil.

Description

Mold for reducing air holes in inner surface of cast coil

Technical Field

The utility model belongs to the technical field of transformer equipment, specifically speaking relates to a reduce mould of pouring coil internal surface gas pocket.

Background

The light bubble holes on the inner surface of the coil can cause the partial discharge experiment of the transformer to be unqualified, and the serious bubble holes can cause the discharge phenomenon in the withstand voltage test of the transformer, thereby seriously affecting the product quality.

After the finished coil is demoulded, inspection shows that bubble holes are found when the height of the inner surface of the coil from the lower coil is less than half of the height of the inner surface of the coil, some bubble holes are good for inspection of breakage, and some bubble holes are covered with a layer of resin, have whitish inner parts, and are easy to leak inspection when being broken by collision. In order to eliminate the generation of bubbles, the generation of bubbles is not eliminated by measures such as the material selection requirement of resin, the adjustment of vacuum degree in the pouring process, the adjustment of temperature in the curing process, the dosage control of mold release agent coated on the surface of a mold and the like. After the finished product is finished, only inspection and repair can be enhanced, and a large amount of manpower, material resources and time are wasted.

SUMMERY OF THE UTILITY MODEL

The utility model provides a reduce mould of pouring coil internal surface gas pocket has solved the shortcoming that there is the gas pocket in the pouring coil internal surface among the background art.

The technical scheme of the utility model is realized like this: the mold for reducing the air holes in the inner surface of the cast coil comprises an inner mold, wherein a release agent is coated on the surface of the inner mold, a winding machine spindle is arranged in a middle hole of the inner mold, an upper baffle is arranged above the inner mold, a lower baffle is arranged below the inner mold, an alkali-free and wax-free glass fiber tape is semi-lap-wound on the inner mold from the lower baffle, the lap-winding width at least accounts for more than 1/2 of the inner mold, and the lap-winding height is at least more than 3/4 of the coil.

The utility model has the advantages that: the utility model discloses an interior mould surface is half lap winding one deck alkali-free and wax-free glass fiber tape, utilizes the capillary fiber in glass fiber tape to pierce the bubble under the vacuum environment, can not form effective bubble between the surperficial net cloth of interior mould, has improved the pouring quality of pouring coil.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Description of the parts: 1. the inner mold comprises an inner mold body 2, an upper baffle plate 3, a lower baffle plate 4, an alkali-free and wax-free glass fiber band 5 and a winding machine main shaft.

Detailed Description

For a better understanding and appreciation of the invention, it will be further described in connection with the accompanying drawings: the utility model provides a reduce mould of pouring coil internal surface gas pocket, includes centre form 1, centre form 1 coats on the surface release agent, centre form 1 intermediate hole is equipped with coiling machine main shaft 5, centre form 1 top is equipped with overhead gage 2, the below is equipped with down baffle 3, from centre form 1 upper half lap winding alkali-free wax-free glass fiber tape 4 of baffle 3 department down, alkali-free wax-free glass fiber tape 4 thickness 0.1mm, width 25mm, lap winding width accounts for more than 1/2 of centre form 1, lap winding height is more than 3/4 of coil height at least.

Coating a release agent on the surface of the mould according to requirements, wiping with a paper towel to ensure that the surface of the mould is integrally coated with a layer of mould supporting agent, the release agent cannot have water drop-shaped residues, and a layer of alkali-free and wax-free glass fiber tape is wound on the upper half of the inner mould from a lower baffle of the mould in an overlapping way, wherein the height of the glass fiber tape at least ensures that the height of a coil is more than 3/4. The capillary fibers of the glass fiber tape are utilized to puncture bubbles formed in a vacuum environment, and effective bubbles cannot be formed between the gridding cloth on the surface of the inner die.

Claims

1. The utility model provides a reduce mould of pouring coil internal surface gas pocket, its characterized in that includes centre form (1), scribbles the release agent on centre form (1) surface, centre form (1) middle hole is equipped with coiling machine main shaft (5), centre form (1) top is equipped with overhead gage (2), the below is equipped with down baffle (3), half lap winding one deck alkali-free and wax-free glass fiber tape (4) on centre form (1) that baffle (3) begin under the mould, lap winding width accounts for more than 1/2 of centre form (1) at least, lap winding height is more than 3/4 of coil height at least.