CN209766069U - Small round-corner enameled flat wire - Google Patents

Abstract

The utility model discloses a small round corner enameled flat wire, which comprises a copper conductor with a round rectangular section, wherein the outer surface of the copper conductor is sequentially provided with a skirt edge self-adhesive layer, a first insulating layer, a second insulating layer, a corona resistant layer and a waterproof wear-resistant layer from inside to outside; the skirt edge self-adhesive layer is a ridge arranged on the narrow edge of the copper wire, and the ridge is arranged at intervals along the length direction of the copper wire; the first insulating layer comprises a wide finish paint layer and a narrow finish paint layer, the wide finish paint layer is arranged on the wide surface of the copper wire, the narrow finish paint layer is arranged on the narrow surface of the copper wire, and the edge of the narrow finish paint layer extends to the wide surface; the radius of the copper wire fillet is 0.1-0.2 mm. The utility model has the characteristics of the fillet is less relatively, and narrow limit paint film internal stress is less. The utility model discloses can further improve the groove fullness rate, prolong the paint film life-span.

Description

Small round-corner enameled flat wire

Technical Field

The utility model relates to an enameled flat wire, especially a small circle angle enameled flat wire.

Background

The enameled wire is a wire with an insulated paint layer coated on the surface, is mainly used as a wire for a motor winding, and is a main raw material of products such as motors, electric appliances and the like. The section shapes of the enameled wires are mainly divided into circles and rounded rectangles. Although the inner conductor of the round enameled wire is easy to manufacture, when in use, the full rate of the round enameled wire is about 78% when the round enameled wire is wound in a normal position, and the full rate of the round enameled wire is about 91% when the round enameled wire is wound in a staggered position. The groove filling rate of the enameled wire with the round-angle rectangular section in winding is about 96%. The high full rate of the groove brings many advantages, firstly, under the condition of the same space, the full rate of the groove is high, the sectional area is large, and the groove can adapt to higher load by larger current; secondly, the heat conduction efficiency of air is not as good as that of the conductor, the high slot filling rate means that the gaps are few, the conductor can conduct heat more efficiently, and the heat dissipation performance is better.

However, the enameled rectangular wire also has a certain problem compared to the round wire. Firstly, the round corner is easy to have less painting amount, the round corner is stretched after being wound, so that the thickness of a paint film is further reduced, and unqualified breakdown voltage is easy to occur. The problem is more likely to occur when the fillet is smaller, so that the existing conventional enameled wire fillet is not limited by the paint film and has a diameter of 0.3-0.6 mm. Secondly, the winding of the rounded rectangle has directionality, namely the paint surfaces on the outer sides of the bending are always the same, and the paint film on the narrow sides of the enameled flat wire is also stretched all the time. Due to the small area of the narrow side, this situation can cause the paint film on the narrow side to generate larger internal stress, and the paint film on the wide side is more prone to aging damage.

Therefore, the prior enameled flat wire has relatively large round angle and high internal stress of a paint film on a narrow edge.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a small circle angle enameled flat wire. The utility model has the characteristics of the fillet is less relatively, and narrow limit paint film internal stress is less. The utility model discloses can further improve the groove fullness rate, prolong the paint film life-span.

The technical scheme of the utility model: a small round-corner enameled flat wire comprises a copper wire with a round-corner rectangular cross section, wherein a skirt-edge self-adhesive layer, a first insulating layer, a second insulating layer, a corona-resistant layer and a waterproof wear-resistant layer are sequentially arranged on the outer surface of the copper wire from inside to outside; the skirt edge self-adhesive layer is a ridge arranged on the narrow edge of the copper wire, and the ridge is arranged at intervals along the length direction of the copper wire; the first insulating layer comprises a wide finish paint layer and a narrow finish paint layer, the wide finish paint layer is arranged on the wide surface of the copper wire, the narrow finish paint layer is arranged on the narrow surface of the copper wire, and the edge of the narrow finish paint layer extends to the wide surface; the radius of the copper wire fillet is 0.1-0.2 mm.

In the small round-corner enameled flat wire, two ends of the ridge extend to the wide surface of the copper conductor.

In the small round-corner enameled rectangular wire, the thickness ratio of the second insulating layer, the corona-resistant layer and the waterproof wear-resistant layer is 2:1: 1.

In the small round-corner enameled rectangular wire, the thickness of the second insulating layer is not less than 0.1 mm.

In the small round-corner enameled flat wire, the narrow edge of the copper wire is not less than 0.6 mm.

Compared with the prior art, the paint film coated on the narrow surface is in a skirt shape through the ridges arranged at intervals; meanwhile, the narrow finishing paint layer and the wide finishing paint layer of the innermost layer are coated separately and are relatively independent. Therefore, after winding, the shape of the skirt edge provides deformation redundancy for the paint film, internal stress generated by deformation is reduced, and the thinning degree of the paint film is slowed down; further, the wide finish paint layer and the narrow finish paint layer are relatively independent, compared with an integral paint film, the structure enables the tensile force generated by the wide finish paint layer on the narrow finish paint layer to be reduced, the internal stress of the narrow finish paint layer is further reduced, and the paint film thinning is slowed down. The narrow-surface paint layer has small internal stress, less cracking phenomenon in the aging process and prolonged effective service life.

Furthermore, the ridge and the narrow finish paint layer extend to the wide side, so that the round corners are multiply coated, and the paint film is stretched and thinned to a lower degree in combination with the above, so that the paint film thickness at the round corners is ensured, and the round corners can be made smaller. Whereby the slot fill ratio can be further improved.

Further, the utility model discloses a thicker second insulating layer guarantees the insulating nature of paint film on the one hand, and on the other hand can be gentle the unevenness that first insulating layer and shirt rim self-adhesive layer produced, guarantees the surface quality of paint film.

To sum up, the utility model has the characteristics of the fillet is less relatively, and narrow limit paint film internal stress is less. The utility model discloses can further improve the groove fullness rate, prolong the paint film life-span.

Drawings

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

FIG. 2 is a schematic view of a land structure;

FIG. 3 is a side schematic view of FIG. 2;

FIG. 4 is a schematic structural diagram of a first insulating layer;

Fig. 5 is a schematic sectional view taken along line a-a in fig. 4.

Reference numerals: the coating comprises 1-copper wires, 2-skirt self-adhesive layers, 3-first insulating layers, 4-second insulating layers, 5-corona-resistant layers, 6-waterproof wear-resistant layers, 7-ridges, 8-wide finish paint layers and 9-narrow finish paint layers.

Detailed Description

The present invention will be further described with reference to the following examples, which are not intended as a limitation to the present invention.

Example (b): a small round-corner enameled flat wire is shown in figures 1 to 5 and comprises a copper wire 1 with a round-corner rectangular cross section, wherein a skirt self-adhesive layer 2, a first insulating layer 3, a second insulating layer 4, a corona-resistant layer 5 and a waterproof wear-resistant layer 6 are sequentially arranged on the outer surface of the copper wire 1 from inside to outside; the skirt edge self-adhesive layer 2 is a ridge 7 arranged on the narrow edge of the copper wire 1, and the ridge 7 is arranged at intervals along the length direction of the copper wire 1; the first insulating layer 3 comprises a wide finish paint layer 8 and a narrow finish paint layer 9, the wide finish paint layer 8 is arranged on the wide surface of the copper wire 1, the narrow finish paint layer 9 is arranged on the narrow surface of the copper wire 1, and the edge of the narrow finish paint layer 9 extends to the wide surface; the radius of the fillet of the copper conductor 1 is 0.1-0.2 mm.

Both ends of the ridge 7 extend to the wide surface of the copper conductor 1. The thickness ratio of the second insulating layer 4 to the corona-resistant layer 5 to the waterproof wear-resistant layer 6 is 2:1: 1. The thickness of the second insulating layer 4 is not less than 0.1 mm. The narrow side of the copper wire 1 is not less than 0.6 mm.

the skirt self-adhesive layer 2 and the polyamide self-adhesive paint layer which is preferred by the first insulating layer 3, the polyamide imide paint layer which is preferred by the second insulating layer 4, the corona-resistant layer 5 is preferably voltron vs series wire enamel of DuPont company, and the waterproof wear-resistant layer 6 is preferably photocured. The above-mentioned lacquer layer represents a structural division and does not represent a specific number of applications. For example, the second insulating layer 4 may be subjected to coating and drying several times to ten or more times.

The working principle is as follows:

the paint film coated on the narrow surface is in a skirt shape through the ridges 7 arranged at intervals; meanwhile, the narrow finish paint layer 9 and the wide finish paint layer 8 of the innermost layer are separately coated, and are relatively independent. Therefore, after winding, the shape of the skirt edge provides deformation redundancy for the paint film, internal stress generated by deformation is reduced, and the thinning degree of the paint film is slowed down; further, the wide finish paint layer 8 and the narrow finish paint layer 9 are relatively independent, and compared with an integral paint film, the structure reduces the tensile force generated by the wide finish paint layer 8 on the narrow finish paint layer 9, further reduces the internal stress of the narrow finish paint layer 9 and slows down the thinning of the paint film. The narrow top coat layer 9 has a small internal stress and is less prone to aging, and the effective service life of the narrow top coat layer is prolonged.

Furthermore, the ridges 7 and the narrow top coat layer 9 extend to the wide side, whereby the corners are multiply coated and the paint film is less drawn down in combination with the above, whereby the paint film thickness at the corners is ensured and the fillets can be made smaller. Whereby the slot fill ratio can be further improved.

The unevenness caused by the ridges 7 and the first insulating layer 3 is smoothly covered by the subsequent coating of the paint film, and the surface of the resulting paint film is still smooth.

Claims (5)

1. The utility model provides a small circle angle enameled rectangular wire which characterized in that: the anti-corona and anti-wear copper wire comprises a copper wire (1) with a round-corner rectangular cross section, wherein a skirt edge self-adhesive layer (2), a first insulating layer (3), a second insulating layer (4), a corona-resistant layer (5) and a waterproof and wear-resistant layer (6) are sequentially arranged on the outer surface of the copper wire (1) from inside to outside; the skirt edge self-adhesive layer (2) is a ridge (7) arranged on the narrow edge of the copper wire (1), and the ridge (7) is arranged at intervals along the length direction of the copper wire (1); the first insulating layer (3) comprises a wide finish paint layer (8) and a narrow finish paint layer (9), the wide finish paint layer (8) is arranged on the wide surface of the copper wire (1), the narrow finish paint layer (9) is arranged on the narrow surface of the copper wire (1), and the edge of the narrow finish paint layer (9) extends to the wide surface; the radius of the fillet of the copper conductor (1) is 0.1-0.2 mm.

2. The small round-corner enameled rectangular wire according to claim 1, characterized in that: and two ends of the ridge (7) extend to the wide surface of the copper wire (1).

3. The small round-corner enameled rectangular wire according to claim 1, characterized in that: the thickness ratio of the second insulating layer (4), the corona-resistant layer (5) and the waterproof wear-resistant layer (6) is 2:1: 1.

4. The small round-corner enameled rectangular wire according to claim 3, characterized in that: the thickness of the second insulating layer (4) is not less than 0.1 mm.

5. The small round-corner enameled rectangular wire according to claim 1, characterized in that: the narrow side of the copper wire (1) is not less than 0.6 mm.