CN217008686U - Small diameter lightweight flexible coaxial cable - Google Patents

Abstract

The utility model discloses a small-diameter light and soft coaxial cable which comprises an oval center core material, wherein the center core material is formed by stranding a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tinned copper monofilaments are stranded around the outside of the center core material to form an inner conductor, the outer diameter of the inner conductor is 1mm to 2mm, a cross-linked fluororubber insulator, a conductive fiber winding shielding layer and a polyurethane outer sheath are sequentially coated outside the inner conductor, the cross-linked fluororubber insulator sequentially comprises an inner insulator, a porous insulator and an outer insulator from inside to outside, a plurality of through holes are formed in a cross-linked fluororubber body of the porous insulator, the thicknesses of the inner insulator and the outer insulator are not less than 0.15mm, and the outer diameter of the polyurethane outer sheath is 1.8mm to 4.2 mm. The coaxial cable is manufactured based on small diameter and light weight, and is better in flexibility, stable in shielding effect and durable in use.

Description

Small diameter lightweight flexible coaxial cable

technical field

The utility model relates to the technical field of cables, in particular to a thin-diameter light-weight flexible coaxial cable.

Background technique

Coaxial cable is one of the main varieties of wire and cable. Coaxial cables need to have good flexibility and shielding performance. In the automated industrial manufacturing production line, the electrical connection and control of small robots and electronic machines need to be applied to coaxial cables with high flexibility and bending resistance, which must also have good electrical characteristics for long-distance transmission. . Coaxial cables are gradually becoming thinner and lighter, which will bring many advantages to the industry, such as low cost, economical and practical. However, the shielding layer of the common coaxial cable adopts a metal braided shielding structure, which requires a large amount of copper wire, a large weight, and a high manufacturing cost, which is not conducive to the production of small diameter and light weight.

Utility model content

Aiming at the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a thin-diameter light-weight soft coaxial cable, which is made based on the thin-diameter and light weight, and has better flexibility, stable shielding effect and durable use.

The utility model solves the above technical problems through the following technical solutions.

A thin-diameter, lightweight and flexible coaxial cable, comprising an oval-shaped central core material, the central core material is composed of a plurality of para-type wholly aromatic copolyamide drawn fibers stranded, and a plurality of tinned copper monofilaments surround the center The outside of the core material is twisted to form an inner conductor, the outer diameter of the inner conductor is 1mm to 2mm, and the outer part of the inner conductor is sequentially covered with a cross-linked fluororubber insulator, a conductive fiber wound shielding layer and a polyurethane outer sheath. The bifluororubber insulator sequentially includes an inner insulator, a porous insulator and an outer insulator from the inside to the outside. The porous insulator is formed with a plurality of through holes on the cross-linked fluororubber body. Less than 0.15mm, the outer diameter of the polyurethane outer sheath is 1.8mm to 4.2mm.

Preferably, the wire diameter of the tinned copper monofilament is 0.05mm to 0.16mm.

Preferably, the long axis of the central core material is not more than 0.5 mm, and the short axis of the central core material is not less than 0.25 mm.

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

Preferably, the twisting direction of the central core material is the same as the twisting direction of the inner conductor.

Preferably, the thickness of the cross-linked fluororubber insulator is 0.45mm to 2.6mm.

Preferably, the porosity of the cross-linked fluororubber insulator is 15% to 40%.

Preferably, the conductive fiber winding shielding layer is a conductive fiber bundle helically wound structure, and the conductive fiber bundle is formed by twisting two polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating, and the polyacrylonitrile The wire diameter of the base carbon fiber does not exceed 25 μm.

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

The beneficial effects of the present utility model:

1. The structure of the central core strip is oval. When the cable is subjected to bending, the central core strip is subjected to extrusion deformation and becomes flat, so that there is a misalignment between the center point of the center core strip and the center point of the inner conductor. The load stress applied to the inner conductor can be effectively relieved, and the local stress concentration of the inner conductor can be reduced. , With high flexibility, it helps to make the conductor lighter and smaller, maintain stable electrical properties, and have better durability.

2. The inner conductor is covered with cross-linked fluororubber insulator, which has better flexibility and can withstand lateral pressure during bending, improve the flexibility and bending resistance of the cable, and reasonably design the thickness of the inner insulator and outer insulator to maintain excellent resistance. Voltage characteristics, durable use. The middle of the cross-linked fluororubber insulator is a porous insulator. On the basis of maintaining the distance of the electrical insulation gap, the material weight of the cable insulation layer is reduced, which helps to realize the lightweight production of the cable and reduce the use cost.

3. The conductive fiber winding shielding layer replaces the original metal shielding layer, which is helpful for the design of small diameter and light weight. The conductive fiber bundle of the conductive fiber winding shielding layer is formed by twisting polyacrylonitrile-based carbon fiber and coating with a copper conductive coating. It can effectively replace the shielding layer of metal materials, and on the basis of ensuring the stable shielding performance, reduce the weight of the cable, reduce the cost, and realize the needs of small diameter and light weight production.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of an embodiment of the present utility model.

In the figure: 1- center core material, 2- inner conductor, 3- cross-linked fluororubber insulator, 31- inner insulator, 32- porous insulator, 33- outer insulator, 34- through hole, 4- conductive fiber winding shielding layer, 5-Polyurethane outer sheath.

Detailed ways

The technical solutions of the present utility model will be further described below with reference to the accompanying drawings and through specific embodiments.

As shown in FIG. 1 , the thin-diameter, light-weight and flexible coaxial cable according to the embodiment of the present invention includes an elliptical center core material 1, and the center core material 1 is a plurality of para-type wholly aromatic copolyamide stretched fiber strands. Specifically, the long axis of the central core material 1 is not more than 0.5 mm, and the short axis of the central core material 1 is not less than 0.25 mm. A plurality of tinned copper monofilaments are twisted around the central core 1 to form an inner conductor 2. For example, the wire diameter of the tinned copper monofilament is 0.05mm to 0.16mm, and the outer diameter of the inner conductor 2 is 1mm to 2mm. The twisting direction of the central core material 1 is the same as the twisting direction of the inner conductor 2 . Preferably, the lay length of the inner conductor 2 is five to twelve times the outer diameter of the inner conductor 2 .

The outside of the inner conductor 2 is sequentially covered with a cross-linked fluororubber insulator 3 , a conductive fiber wound shielding layer 4 and a polyurethane outer sheath 5 . The cross-linked fluororubber insulator 3 sequentially includes an inner insulator 31, a porous insulator 32 and an outer insulator 33 from the inside to the outside. The porous insulator 32 is formed with a plurality of through holes 34 on the cross-linked fluororubber body. The porosity of the cross-linked fluororubber insulator 3 is 15% to 40%. The thickness of both the inner insulator 31 and the outer insulator 33 is not less than 0.15 mm, and preferably, the thickness of the cross-linked fluororubber insulator 3 is 0.45 mm to 2.6 mm. The outer diameter of the polyurethane outer sheath 5 is 1.8 mm to 4.2 mm. In one embodiment, the conductive fiber winding shielding layer 4 is a conductive fiber bundle helically wound structure, and the conductive fiber bundle is formed by twisting two kinds of polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating. The wire diameter of the polyacrylonitrile-based carbon fiber is not more than 25 μm, and further, the outer diameter of the conductive fiber bundle is 0.15 mm to 0.28 mm.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (9)

1. Thin footpath light soft type coaxial cable, characterized by: comprises an oval center core material (1), wherein the center core material (1) is formed by twisting a plurality of para-type wholly aromatic copolyamide drawn fibers, a plurality of tin-plated copper monofilaments are twisted around the outside of the center core material (1) to form an inner conductor (2), the outer diameter of the inner conductor (2) is 1mm to 2mm, the outer part of the inner conductor (2) is sequentially coated with a cross-linked fluororubber insulator (3), a conductive fiber winding shielding layer (4) and a polyurethane outer sheath (5), the cross-linked fluororubber insulator (3) comprises an inner insulator (31), a porous insulator (32) and an outer insulator (33) from inside to outside in sequence, the porous insulator (32) is a cross-linked fluororubber body on which a plurality of through holes (34) are formed, the thickness of the inner insulator (31) and the thickness of the outer insulator (33) are not less than 0.15mm, and the outer diameter of the polyurethane outer sheath (5) is 1.8mm to 4.2 mm.

2. The small-diameter lightweight flexible coaxial cable according to claim 1, characterized in that: the diameter of the tinned copper monofilament is 0.05 mm-0.16 mm.

3. The thin-gauge, lightweight, flexible coaxial cable of claim 1, wherein: the long axis of the center core material (1) is not more than 0.5mm, and the short axis of the center core material (1) is not less than 0.25 mm.

4. The small-diameter lightweight flexible coaxial cable according to claim 1, characterized in that: the twisting distance of the inner conductor (2) is five to twelve times of the outer diameter of the inner conductor (2).

5. The small-diameter lightweight flexible coaxial cable according to claim 1, characterized in that: the twisting direction of the central core material (1) is the same as that of the inner conductor (2).

6. The small-diameter lightweight flexible coaxial cable according to claim 1, characterized in that: the thickness of the cross-linked fluorine rubber insulator (3) is 0.45mm to 2.6 mm.

7. The small-diameter lightweight flexible coaxial cable according to claim 1, characterized in that: the cross-linked fluororubber insulator (3) has a porosity of 15% to 40%.

8. The small-diameter lightweight flexible coaxial cable according to claim 1, characterized in that: the conductive fiber winding shielding layer (4) is of a conductive fiber bundle spiral winding structure, the conductive fiber bundle is formed by twisting two polyacrylonitrile-based carbon fibers with different wire diameters and coating a copper conductive coating, and the wire diameter of the polyacrylonitrile-based carbon fiber is not more than 25 mu m.

9. The small-diameter lightweight flexible coaxial cable according to claim 8, characterized in that: the outer diameter of the conductive fiber bundle is 0.15mm to 0.28 mm.

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