CN217008688U - Light conductive fiber coaxial cable - Google Patents

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

Lightweight Conductive Fiber Coaxial Cable

technical field

The utility model relates to the technical field of cables, in particular to a light-weight conductive fiber 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 highly flexible coaxial cables, 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 light-weight conductive fiber coaxial cable, which is based on light-weight production, has high flexibility, has stable shielding performance and is durable in use.

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

A light-weight conductive fiber coaxial cable, comprising an oval center core bar, the center core bar is composed of a plurality of para-type wholly aromatic copolyamide drawn fibers stranded, and a number of tinned copper monofilaments are surrounded by the center core bar The outer part is twisted to form an inner conductor, and the outer part of the inner conductor is sequentially covered with a foamed fluororesin tape wrapping an inner insulating layer, a fluororesin extruded outer insulating layer, a conductive fiber shielding layer and a silane-grafted cross-linked high-density polyethylene protective layer. jacket layer, the conductive fiber shielding layer is a double-layer aramid fiber twisted wire woven in a reverse spiral to form a cylindrical support net body, the support net body is uniformly distributed with a number of conductive fiber bundles, and the conductive fiber bundles are uniformly distributed on the circumference of the support net body. The fiber bundle is formed by twisting several polyacrylonitrile-based carbon fibers and coating copper conductive coating, the wire diameter of the polyacrylonitrile-based carbon fiber does not exceed 20 μm, and the layout area of the conductive fiber bundle accounts for 55% of the surface area of the support mesh. % to 98%, the outer diameter of the silane-grafted cross-linked high-density polyethylene sheath layer is 1.45 mm to 4.2 mm.

Preferably, the long axis of the central core bar is not more than 0.8 mm, and the short axis of the central core bar is not less than 0.2 mm.

Preferably, the wire diameter of the tinned copper monofilament does not exceed 0.15mm.

Preferably, the outer diameter of the inner conductor does not exceed 1.8 mm.

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

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

Preferably, the thickness ratio of the foamed fluororesin tape wrapping the inner insulating layer to the fluororesin extruding outer insulating layer is 1.25:1 to 2.5:1.

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

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

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. , has high flexibility and anti-bending properties, which contributes to the lightweight and fine-diameter production of conductors, maintains stable electrical properties, and has better durability.

2. The conductive fiber shielding layer is woven with double-layer aramid twisted wires to form a cylindrical support net body, which has high strength and high modulus, which makes the cable more flexible. Conductive fiber bundles are arranged on the support net body, and the conductive fibers The bundle is formed of polyacrylonitrile-based carbon fiber twisted and coated with a copper conductive coating, so that the layout area of the conductive fiber bundle accounts for 55% to 98% of the surface area of the support mesh, which can effectively replace the metal shielding layer and ensure stable shielding performance. On the basis, reduce weight, reduce cost, and realize the production of small diameter and light weight.

3. The foamed fluororesin tape wrapping the inner insulating layer can reduce the dielectric constant and dielectric loss, reduce the capacitance and attenuation of the cable, help to improve the sliding between the insulating layer and the inner conductor, and reduce the local stress of the inner conductor Concentrate, reduce the torque force, make the flexibility better, and resist extrusion deformation. The tensile strength and elongation are greater than those of the foamed fluororesin tape wrapping the inner insulating layer. While maintaining flexibility, the fluororesin extruding the outer insulating layer forms an effective protection for the inner foaming fluororesin tape wrapping the inner insulating layer. And it is beneficial to maintain the sliding property with the outer sheath and resist extrusion deformation.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the utility model embodiment;

FIG. 2 is a partial enlarged structural schematic diagram of a conductive fiber shielding layer according to an embodiment of the present invention.

In the figure: 1- Center core strip, 2- Inner conductor, 3- Foamed fluororesin tape wrapping inner insulating layer, 4- Fluorine resin extruding outer insulating layer, 5- Conductive fiber shielding layer, 6- Silane grafting Connect high-density polyethylene sheath layer, 7-conductive fiber bundle, 8-support mesh.

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 and FIG. 2 , the light-weight conductive fiber coaxial cable according to the embodiment of the present invention includes an elliptical center core bar 1, and the center core bar 1 is a plurality of para-type wholly aromatic copolyamide drawn fibers Stranding constitutes, specifically, the long axis of the central core bar 1 is not more than 0.8 mm, and the short axis of the central core bar 1 is not less than 0.2 mm. A plurality of tinned copper monofilaments are twisted around the outside of the central core bar 1 to form an inner conductor 2. Specifically, the wire diameter of the tinned copper monofilament does not exceed 0.15mm, and the outer diameter of the inner conductor 2 does not exceed 1.8mm. . Further, the lay length of the inner conductor 2 is five to fifteen times the outer diameter of the inner conductor 2 . The inner conductor 2 is sequentially covered with a foamed fluororesin tape wrapping an inner insulating layer 3, a fluororesin extruded outer insulating layer 4, a conductive fiber shielding layer 5 and a silane-grafted cross-linked high-density polyethylene sheath layer 6. . Wherein, the total thickness of the foamed fluororesin tape wrapping the inner insulating layer 3 and the fluororesin extruding outer insulating layer 4 is 0.45mm to 1.8mm, and the foamed fluororesin tape wrapping the inner insulating layer 3 and The thickness ratio of the fluororesin extruded outer insulating layer 4 is 1.25:1 to 2.5:1. The conductive fiber shielding layer 5 is a double-layer aramid fiber twisted wire that is woven in a reverse spiral to form a cylindrical support net body 8, wherein the helix angle of the aramid fiber twisted wire is 40 degrees to 55 degrees, and further , the wire diameter of the aramid twisted wire is 0.04mm to 0.08mm. A plurality of conductive fiber bundles 7 are evenly distributed on the support net body 8 in the circumferential direction. Further, the outer diameter of the conductive fiber bundles 7 is 0.15 mm to 0.28 mm, and the conductive fiber bundles 7 are several polyacrylonitrile-based carbon fibers. The wire diameter of the polyacrylonitrile-based carbon fibers is not more than 20 μm, and the area of the conductive fiber bundles 7 is 55% to 98% of the surface area of the support mesh 8 . The outer diameter of the silane-grafted cross-linked high-density polyethylene sheath layer 6 is 1.45 mm to 4.2 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 (10)

1. A light-weight conductive fiber coaxial cable, characterized in that it comprises an elliptical center core strip (1), and the center core strip (1) is formed by twisting several para-type wholly aromatic copolyamide stretched fibers, and several Tinned copper monofilaments are twisted around the outside of the central core bar (1) to form an inner conductor (2), and the outside of the inner conductor (2) is sequentially covered with a foamed fluororesin tape to wrap the inner insulating layer (3). , fluororesin extruded outer insulating layer (4), conductive fiber shielding layer (5) and silane-grafted cross-linked high-density polyethylene sheath layer (6), the conductive fiber shielding layer (5) is a double-layer aramid fiber The twisted wires are helically wrapped around each other to form a cylindrical support net body (8), and a plurality of conductive fiber bundles (7) are evenly distributed on the support net body (8) in the circumferential direction. The conductive fiber bundles (7) It is formed by twisting several polyacrylonitrile-based carbon fibers and applying a copper conductive coating, the wire diameter of the polyacrylonitrile-based carbon fibers does not exceed 20 μm, and the layout area of the conductive fiber bundles (7) accounts for the supporting mesh body (8). ) of 55% to 98% of the surface area, and the outer diameter of the silane-grafted cross-linked high-density polyethylene sheath layer (6) is 1.45 mm to 4.2 mm. 2 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the long axis of the central core bar ( 1 ) is not more than 0.8 mm, and the short axis of the central core bar ( 1 ) is not less than 0.8 mm 2 . 0.2mm. 3 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the diameter of the tinned copper monofilament does not exceed 0.15 mm. 4 . 4 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the outer diameter of the inner conductor ( 2 ) does not exceed 1.8 mm. 5 . 5 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the lay length of the inner conductor ( 2 ) is five to fifteen times the outer diameter of the inner conductor ( 2 ). 6 . 6. The light-weight conductive fiber coaxial cable according to claim 1, wherein the foamed fluororesin tape wraps the inner insulating layer (3) and the fluororesin extrudes the outer insulating layer (4). The total thickness is 0.45mm to 1.8mm. 7. The light-weight conductive fiber coaxial cable according to claim 1, characterized in that: the thickness of the foamed fluororesin tape wrapping the inner insulating layer (3) and the fluororesin extruding outer insulating layer (4) thickness The ratio is 1.25:1 to 2.5:1. 8 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the helix angle of the aramid twisted wire is 40 degrees to 55 degrees. 9 . 9 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the wire diameter of the aramid twisted wire is 0.04 mm to 0.08 mm. 10 . 10 . The light-weight conductive fiber coaxial cable according to claim 1 , wherein the outer diameter of the conductive fiber bundle ( 7 ) is 0.15 mm to 0.28 mm. 11 .

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