CN217008688U

CN217008688U - Light conductive fiber coaxial cable

Info

Publication number: CN217008688U
Application number: CN202220459512.4U
Authority: CN
Inventors: 吴英俊; 李清华; 蔡长威; 刘书鑫; 丁志楠
Original assignee: Zhejiang Yuantong Wire and Cable Manufacturing Co Ltd
Current assignee: Zhejiang Yuantong Wire and Cable Manufacturing Co Ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-07-19
Anticipated expiration: 2032-03-04

Abstract

The utility model discloses a light conductive fiber coaxial cable which comprises an oval center core strip, wherein a plurality of tinned copper monofilaments are twisted around the outside of the center core strip to form an inner conductor, a foamed fluororesin tape wrapping inner insulating layer, a fluororesin extruding outer insulating layer, a conductive fiber shielding layer and a silane grafted crosslinked high-density polyethylene sheathing layer are sequentially coated on the outside of the inner conductor, the conductive fiber shielding layer is formed by reversely spirally wrapping and weaving double-layer aramid twisted wires to form a cylindrical supporting net body, a plurality of conductive fiber bundles are uniformly distributed on the supporting net body in the circumferential direction, the conductive fiber bundles are formed by twisting a plurality of polyacrylonitrile-based carbon fibers and coating a copper conductive coating, the distribution area of the conductive fiber bundles accounts for 55-98% of the surface area of the supporting net body, and the outer diameter of the silane grafted crosslinked high-density polyethylene sheathing layer is 1.45-4.2 mm. The cable is manufactured based on light weight, and has high flexibility and stable shielding performance.

Description

Light conductive fiber coaxial cable

Technical Field

The utility model relates to the technical field of cables, in particular to a light conductive fiber coaxial cable.

Background

Coaxial cables are one of the main varieties of wire cables. The coaxial cable needs to have good flexibility and shielding performance. In an automated industrial manufacturing line, electrical connection and control of small robots, electronic machines, and the like are required to be applied to highly flexible coaxial cables, which must also have good electrical characteristics for long-distance transmission. Coaxial cables gradually move to the development of small diameter and light weight, which brings a great deal of benefits such as low manufacturing cost, economy and practicality to the industry. However, the shielding layer of the common coaxial cable adopts a metal braided shielding structure, so that the amount of copper wires is large, the weight is large, the manufacturing cost is high, and the requirements for small-diameter and light-weight production are not facilitated.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a light conductive fiber coaxial cable which is based on light manufacturing, high in flexibility, stable in shielding performance and durable in use.

The utility model solves the technical problems through the following technical scheme.

A light conductive fiber coaxial cable comprises an oval center core strip, wherein the center core strip is formed by twisting a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tinned copper monofilaments are twisted around the outside of the center core strip to form an inner conductor, the outside of the inner conductor is sequentially coated with a foamed fluororesin tape wrapping inner insulating layer, a fluororesin extruding outer insulating layer, a conductive fiber shielding layer and a silane grafted crosslinked high-density polyethylene sheath layer, the conductive fiber shielding layer is a cylindrical support net body formed by reversely spirally wrapping and weaving double-layer aramid twisted wires, a plurality of conductive fiber bundles are uniformly distributed on the support net body in the circumferential direction, the conductive fiber bundles are formed by twisting a plurality of polyacrylonitrile-based carbon fibers and coating a copper conductive coating layer, the wire diameter of the polyacrylonitrile-based carbon fibers is not more than 20 mu m, and the distribution area of the conductive fiber bundles accounts for 55 to 98 percent of the surface area of the support net body, the outer diameter of the silane grafted cross-linked high-density polyethylene sheath layer is 1.45mm to 4.2 mm.

Preferably, the long axis of the central wick is no more than 0.8mm and the short axis of the central wick is no less than 0.2 mm.

Preferably, the diameter of the tin-plated copper monofilament is not more than 0.15 mm.

Preferably, the outer diameter of the inner conductor is not more than 1.8 mm.

Preferably, the inner conductor lay length is five to fifteen times the outer diameter of the inner conductor.

Preferably, the total thickness of the foamed fluororesin tape wrapped inner insulating layer and the fluororesin extruded outer insulating layer is 0.45mm to 1.8 mm.

Preferably, the thickness ratio of the foamed fluororesin tape to the fluorine resin extruded outer insulating layer is 1.25:1 to 2.5: 1.

Preferably, the helical angle of the aramid twisted yarn is 40 to 55 degrees.

Preferably, the diameter of the aramid twisted yarn is 0.04mm to 0.08 mm.

Preferably, the outer diameter of the conductive fiber bundle is 0.15mm to 0.28 mm.

The utility model has the beneficial effects that:

1. the structure of center core strip is oval, when the cable bears the bending in-process, center core strip bears the extrusion deformation and is the platykurtic, the dislocation skew appears between the central point of center core strip and the central point of inner conductor, thereby make the load stress of applying to the inner conductor can effective unloading, reduce the local stress concentration of inner conductor, the tensile elastic modulus of counterpoint type wholly aromatic copolyamide tensile fibre is big, help improving the tensile strength of inner conductor, have high flexibility and bending resistance, help the light weight of conductor, the preparation of thin footpath, keep stable electrical properties, durability is better.

2. The conductive fiber shielding layer is a cylindrical supporting net body formed by weaving double-layer aramid twisted yarns, and has high strength and high modulus, so that the flexibility of the cable is better, conductive fiber bundles are distributed on the supporting net body, and are formed by twisting polyacrylonitrile-based carbon fibers and coating copper conductive coatings, so that the distribution area of the conductive fiber bundles accounts for 55-98% of the surface area of the supporting net body, the conductive fiber bundles can effectively replace a metal material shielding layer, and the shielding layer is ensured to have stable shielding performance, thereby reducing the weight, lowering the cost and realizing the production with thin diameter and light weight.

3. The foaming fluororesin area can reduce dielectric constant and dielectric loss around package inner insulating layer, reduce the electric capacity and the decay of cable, help improving the gliding property between insulating layer and the inner conductor, reduce the local stress concentration of inner conductor, reduce the torsional force, make the pliability better, resistant extrusion deformation, fluororesin crowded package outer insulating layer is as the reinforcing structure layer of foaming fluororesin area around package inner insulating layer, the tensile strength and the elongation of fluororesin crowded package outer insulating layer are greater than foaming fluororesin area around package inner insulating layer, when keeping the compliance, fluororesin crowded package outer insulating layer has formed effectual protection to inside foaming fluororesin area around package inner insulating layer, and be favorable to and keep the gliding property between the oversheath, resistant extrusion deformation.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 2 is a partially enlarged structural schematic view of the conductive fiber shielding layer according to the embodiment of the utility model.

In the figure: 1-a central core strip, 2-an inner conductor, 3-a foamed fluororesin tape wrapped inner insulating layer, 4-a fluororesin extruded outer insulating layer, 5-a conductive fiber shielding layer, 6-a silane grafted cross-linked high-density polyethylene sheath layer, 7-a conductive fiber bundle and 8-a supporting net body.

Detailed Description

The technical scheme of the utility model is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 and fig. 2, the lightweight conductive fiber coaxial cable according to the embodiment of the present invention includes an elliptical central core 1, where the central core 1 is formed by twisting a plurality of para-type wholly aromatic copolyamide drawn fibers, specifically, a major axis of the central core 1 is not more than 0.8mm, and a minor axis of the central core 1 is not less than 0.2 mm. A plurality of tin-plated copper monofilaments surround the outside of the central core strip 1 and are twisted to form an inner conductor 2, specifically, the wire diameter of each tin-plated copper monofilament is not more than 0.15mm, and the outer diameter of the inner conductor 2 is not more than 1.8 mm. Further, the lay length of the inner conductor 2 is five to fifteen times of the outer diameter of the inner conductor 2. The outer portion of the inner conductor 2 is sequentially coated with a foamed fluororesin tape wrapping inner insulating layer 3, a fluororesin extrusion outer insulating layer 4, a conductive fiber shielding layer 5 and a silane grafted cross-linked high-density polyethylene sheath layer 6. The total thickness of the foamed fluororesin tape wrapped inner insulating layer 3 and the fluororesin extruded outer insulating layer 4 is 0.45mm to 1.8mm, and the thickness ratio of the foamed fluororesin tape wrapped inner insulating layer 3 to the fluororesin extruded outer insulating layer 4 is 1.25:1 to 2.5: 1. The conductive fiber shielding layer 5 is formed by lapping and weaving double-layer aramid twisted wires in a reverse spiral mode to form a cylindrical supporting net body 8, wherein the spiral angle of the aramid twisted wires is 40-55 degrees, and further the wire diameter of the aramid twisted wires is 0.04-0.08 mm. The supporting net body 8 is circumferentially and uniformly distributed with a plurality of conductive fiber bundles 7, further, the outer diameter of each conductive fiber bundle 7 is 0.15 mm-0.28 mm, each conductive fiber bundle 7 is formed by stranding a plurality of polyacrylonitrile-based carbon fibers and coating the polyacrylonitrile-based carbon fibers with a copper conductive coating, the wire diameter of each polyacrylonitrile-based carbon fiber is not more than 20 mu m, and the distribution area of each conductive fiber bundle 7 accounts for 55% -98% of the surface area of the supporting net body 8. The outer diameter of the silane grafted cross-linked high-density polyethylene sheath layer 6 is 1.45 mm-4.2 mm.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. Light conductive fiber coaxial cable, characterized by: the cable comprises an oval center core strip (1), wherein the center core strip (1) is formed by stranding a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tinned copper monofilaments surround the center core strip (1) to form an inner conductor (2), the outer part of the inner conductor (2) is sequentially coated with a foamed fluororesin tape wrapped inner insulating layer (3), a fluororesin extruded outer insulating layer (4), a conductive fiber shielding layer (5) and a silane grafted crosslinked high-density polyethylene sheath layer (6), the conductive fiber shielding layer (5) is a cylindrical support net body (8) formed by reversely spirally wrapping and weaving double-layer aramid twisted wires, a plurality of conductive fiber bundles (7) are uniformly distributed on the support net body (8) in the circumferential direction, the conductive fiber bundles (7) are formed by stranding a plurality of polyacrylonitrile-based carbon fibers and coating copper conductive coating layers, and the wire diameter of the polyacrylonitrile-based carbon fibers is not more than 20 mu m, the distribution area of the conductive fiber bundles (7) accounts for 55-98% of the surface area of the support net body (8), and the outer diameter of the silane grafted and crosslinked high-density polyethylene sheath layer (6) is 1.45-4.2 mm.

2. The lightweight conductive fiber coaxial cable of claim 1, wherein: the long axis of the central core bar (1) is not more than 0.8mm, and the short axis of the central core bar (1) is not less than 0.2 mm.

3. The lightweight conductive fiber coaxial cable of claim 1, wherein: the diameter of the tinned copper monofilament is not more than 0.15 mm.

4. The lightweight conductive fiber coaxial cable of claim 1, wherein: the outer diameter of the inner conductor (2) is not more than 1.8 mm.

5. The lightweight conductive fiber coaxial cable of claim 1, wherein: the lay length of the inner conductor (2) is five times to fifteen times of the outer diameter of the inner conductor (2).

6. The lightweight conductive fiber coaxial cable of claim 1, wherein: the total thickness of the foamed fluororesin belt wrapping inner insulating layer (3) and the fluororesin extruded outer insulating layer (4) is 0.45mm to 1.8 mm.

7. The lightweight conductive fiber coaxial cable of claim 1, wherein: the thickness ratio of the foamed fluororesin tape wrapping inner insulating layer (3) to the fluororesin extruded outer insulating layer (4) is 1.25:1 to 2.5: 1.

8. The lightweight conductive fiber coaxial cable of claim 1, wherein: the spiral angle of the aramid twisted wire is 40-55 degrees.

9. The lightweight conductive fiber coaxial cable of claim 1, wherein: the diameter of the aramid twisted yarn is 0.04mm to 0.08 mm.

10. The lightweight conductive fiber coaxial cable of claim 1, wherein: the outer diameter of the conductive fiber bundle (7) is 0.15mm to 0.28 mm.