CN210640030U

CN210640030U - Corona-resistant composite film lapped wire

Info

Publication number: CN210640030U
Application number: CN201922027871.3U
Authority: CN
Inventors: 张祺
Original assignee: Anhui Zhongwei Copper Co Ltd
Current assignee: Anhui Zhongwei Copper Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-05-29
Anticipated expiration: 2029-11-22

Abstract

The utility model relates to an electromagnetism discloses a corona resistance composite film winds line field, including the baseline, the baseline is folded outward and is wrapped there is the composite film layer, and the composite film layer includes polyimide film layer and two-layer water barrier, and two-layer water barrier superposes respectively in two opposite sides of polyimide film layer, and the water barrier includes the net layer and adheres to the first waterproof coating on the net layer. The base line is directly wrapped with a composite film layer of a waterproof layer, a polyimide film layer and a waterproof layer, and the polyimide film layer is protected from water by the double waterproof layers.

Description

Corona-resistant composite film lapped wire

Technical Field

The utility model relates to an electromagnetism especially relates to a corona resistance compound film is around package line in the package line field.

Background

Because the voltage born by the first turn of the motor stator winding is more than 10 times of the average turn-to-turn voltage, the turn insulation of the variable frequency motor is broken down early, and a corona-resistant insulating layer is required to be wrapped on the outer layer of the turn insulation of the motor so as to improve the bearing degree of the highest breakdown voltage. The common method is to dope nano-alumina in a polyimide film to improve the corona resistance of the material, but at higher humidity, polyimide molecules are easy to hydrolyze to generate a large amount of ionic groups and small molecules, which aggravates the distortion of an electric field in the material, and causes the problems of rapid downward slip of the corona resistance, unstable highest breakdown voltage and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provide one kind can be under the high humidity environment, it is stable to maintain corona-resistant material, stabilizes corona-resistant performance's composite film around the wire.

The utility model discloses a following technical means realizes solving above-mentioned technical problem: the utility model provides a corona resistant composite film is around package, includes the baseline, and the overlap package has composite film layer outside the baseline, and composite film layer includes polyimide film layer and two-layer water barrier, and two-layer water barrier superpose respectively in two opposite sides of polyimide film layer, and the water barrier includes the net layer and adheres to the first waterproof coating on the net layer.

The utility model has the advantages that: the composite film layer with the waterproof layer-polyimide film layer-waterproof layer is directly wrapped outside the base line, the double waterproof layers carry out waterproof protection on the polyimide film layer and are simultaneously overlapped with the polyimide film layer in a wrapping mode, the phenomenon that the waterproof layer is unevenly distributed on the surface of the polyimide film in the subsequent stretching process of the wrapping line can be avoided, the polyimide film is exposed, the waterproof performance is affected, the grid layer is wrapped in the first waterproof coating, the ductility and the adhesiveness of the first waterproof coating can be improved, and the waterproof layer is prevented from cracking.

Drawings

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

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is a cross-sectional view of the composite film layer of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, a corona-resistant composite film lapped wire includes a base wire 10, a composite film layer 20 is stacked outside the base wire 10, the composite film layer 20 includes a polyimide film layer 21 and two water-blocking layers 22, the two water-blocking layers 22 are stacked on two opposite sides of the polyimide film layer 21, respectively, and the water-blocking layer 22 includes a mesh layer 221 and a first waterproof coating 222 attached to the mesh layer 221.

As shown in fig. 3, the form of the composite film layer 20 composed of the water-resisting layer 22, the polyimide film layer 21 and the water-resisting layer 22 is adopted, on one hand, the polyimide film layer 21 is completely wrapped in the water-resisting layer 22, and in a long-term high-humidity environment, the polyimide molecules are prevented from being hydrolyzed due to the fact that water vapor is directly contacted with the polyimide film layer 21, so that the stable corona resistance function of the polyimide film layer 21 is influenced; on the other hand, the composite film layer 20 is laminated outside the base line 10, so that after the obtained corona-resistant composite film lapped wire is stretched subsequently, the stretched polyimide film layer 21 is still protected by the water-resisting layer 22.

Meanwhile, the waterproof layer 22 is the first waterproof coating 222 wrapped with the mesh layer 221 to increase the ductility of the first waterproof coating 222, and when the waterproof layer 22 is stretched, the mesh layer 221 drives the first waterproof coating 222 in each mesh range to displace along with the stretching, so as to maintain the uniformity of the stretched first waterproof coating 222 on the surface of the base line 10.

The base wire 10 is any one of a copper flat wire, an aluminum flat wire, a copper round wire, and an aluminum round wire.

The polyimide film layer 21 is a corona-resistant polyimide-fluorine 46 film purchased from dupont, the insulating layer thickness is 0.23mm after the film is sintered and heat-sealed on the surface of the base line 10, the corona-resistant service life is longer than 100000 hours under the electric field strength of 50Hz alternating current 20KV/mm with the heat-resistant grade of 200, the breakdown voltage is 8KV, the film can continuously work at the temperature as high as 240 ℃, but the breakdown voltage is obviously reduced after the film continuously exceeds 3000 under the high humidity condition. After two water-resisting layers 22 are additionally arranged on the outer surface of the polyimide film layer 21, the breakdown voltage is still not obviously changed after continuously exceeding 8000 under the high humidity condition.

Wherein, the mesh layer 221 is woven by 3 glass threads as one strand. The glass wire is high temperature resistant and has high ductility, and can compensate the first waterproof coating 222 and increase the heat resistance of the water barrier layer 22. In this embodiment, the grid shape of the grid layer 221 may be any one of a diamond shape, a square shape, and a circular shape, or a cross and combination form, and is not particularly limited.

By adjusting the package rate of the composite film layer 20, the double-side insulation thickness of the composite film layer 20 in this embodiment may be any one of 0.100 to 0.290mm, which specifically includes: 0.100-0.140mm, 0.130-0.180mm, 0.170-0.230mm, 0.210-0.290mm, 0.260-0.340 mm.

In order to avoid the water-resisting layer 22 from being damaged in friction and further improve the heat resistance of the embodiment, 1 or 2 layers of the resistant layer 30 are laminated outside the composite film layer 20, the outer surface of the resistant layer 30 is provided with a wear-resistant layer, and the laminating rate of the resistant layer 30 is 53%.

Wherein, the inner surface of the resistance layer 30 is all cured with a second waterproof coating 31, and the resistance layer 30 is a mica tape layer or a glass fiber layer. The second waterproof coating 31 cured in the resistant layer 30 is added, so that the water-resisting effect on the composite film layer 20 can be further improved.

The total thickness of the composite film layer 20 and the tolerance layer 30 is 0.430-0.570 mm.

The following table shows the results of testing the properties of this example (thickness a: 0.80-5.60, width b: 2.0-16.0) in terms of DC resistance, elongation, etc.

It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

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 corona resistant composite film is around package, includes baseline (10), its characterized in that, baseline (10) outer lap-joint has composite film layer (20), composite film layer (20) include polyimide film layer (21) and two-layer water barrier (22), two-layer water barrier (22) superpose respectively in two opposite sides of polyimide film layer (21), water barrier (22) include grid layer (221) and adhere to first waterproof coating (222) on grid layer (221).

2. A corona resistant composite film covered wire as claimed in claim 1, wherein 1 or 2 layers of the resistant layer (30) are laminated to the outside of the composite film layer (20), the laminating rate of the resistant layer (30) being 53%.

3. The corona resistant composite film covered wire of claim 2, wherein the inner surface of the resistant layer (30) is cured with a second waterproof coating (31), the outer surface of the resistant layer (30) is provided with a wear resistant layer, and the resistant layer (30) is any one of a mica tape layer or a glass fiber layer.

4. A corona resistant composite film covered wire as claimed in any one of claims 1 to 3, wherein the mesh layer (221) is woven from 3 glass filaments in one strand.

5. The corona resistant composite film covered wire of claim 4, wherein said polyimide film layer (21) is a polyimide-fluorine 46 film.

6. The corona resistant composite film covered wire of claim 5, wherein the composite film layer (20) has a double sided insulation thickness of 0.100 mm to 0.290 mm.

7. A corona resistant composite film covered wire according to claim 6, wherein the combined thickness of the composite film layer (20) and the resistance layer (30) is 0.430-0.570 mm.

8. The corona resistant composite film covered wire of claim 7, wherein the base wire (10) is any one of a flat copper wire, a flat aluminum wire, a round copper wire and a round aluminum wire.