CN217086246U

CN217086246U - Bending-resistant small-diameter coaxial cable

Info

Publication number: CN217086246U
Application number: CN202220861527.3U
Authority: CN
Inventors: 黄建卫; 蔡长威; 刘书鑫; 王礼国; 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: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-07-29
Anticipated expiration: 2032-04-14

Abstract

The utility model discloses a thin footpath coaxial cable of resistant deflection type, including the inner conductor, the foaming fluororesin area is around package inner insulating layer, the crowded package outer insulating layer of fluororesin, the copper line is around package inner shield layer, the copper line is around package outer shield layer and polyurethane oversheath, the copper line is around package inner shield layer for the one-way spiral winding of a plurality of inlayer tinned copper monofilament and forms, the copper line is around package outer shield layer for the one-way spiral winding of a plurality of outer tinned copper strands and forms, inlayer tinned copper monofilament footpath is not less than outer tinned copper monofilament footpath, outer tinned copper strand footpath and inlayer tinned copper monofilament diameter ratio are 3:1 to 8:1, the winding direction of outer tinned copper strand and inlayer tinned copper monofilament is opposite and the winding distance is the same, outer tinned copper strand spiral angle and inlayer tinned copper monofilament spiral angle differ 5 degrees to 20 degrees. The cable has better bending resistance, more stable shielding performance and durable use on the premise of manufacturing the cable in a small diameter.

Description

Bending-resistant small-diameter coaxial cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a thin footpath coaxial cable of resistant type.

Background

Coaxial cables are one of the main varieties of wire cables. The coaxial cable needs to have good flexibility and shielding performance. Industrial applications field environments are complex and electromagnetic noise radiation or conduction (EMI) can significantly interfere with the proper operation of equipment, and in this process, an important class of carriers for electromagnetic noise propagation are the various cables used in production line equipment. For example, in an automated industrial manufacturing line, electrical connection and control of small robots, electronic machines, and the like are required to be applied to a coaxial cable having high flexibility and good flexing resistance, and such a coaxial cable must also have good electrical characteristics for long-distance transmission. However, the conventional coaxial cable has poor durability against repetitive torsional bending, so that the attenuation amount of a long-distance transmission signal is increased, the shielding effect is unstable, and the electrical characteristics are greatly affected.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art not enough, the technical problem that solve provides a thin footpath coaxial cable of resistant bending type, under the prerequisite of thin footpath ization preparation, has better resistant bending performance, and shielding property is more stable, and the signal attenuation volume is little, durable use.

The utility model discloses a make above-mentioned technical problem solve through following technical scheme.

The deflection-resistant thin-diameter coaxial cable comprises an inner conductor, a foamed fluororesin tape wrapped inner insulating layer, a fluororesin extruded outer insulating layer, a copper wire wrapped inner shielding layer, a copper wire wrapped outer shielding layer and a polyurethane outer sheath, wherein the foamed fluororesin tape wrapped inner insulating layer, the fluororesin extruded outer insulating layer, the copper wire wrapped inner shielding layer, the copper wire wrapped outer shielding layer and the polyurethane outer sheath are sequentially wrapped outside the inner conductor, the copper wire wrapped inner shielding layer is formed by unidirectional spiral winding of a plurality of inner tin-plated copper monofilaments, the copper wire wrapped outer shielding layer is formed by unidirectional spiral winding of a plurality of outer tin-plated copper stranded wires, the outer tin-plated copper stranded wires are formed by twisting a plurality of outer tin-plated copper monofilaments, the diameters of the inner tin-plated copper monofilaments and the outer tin-plated copper monofilaments are both 0.04mm to 0.12mm, the diameter of the inner tin-plated copper monofilaments is not smaller than the diameter of the outer tin-plated copper monofilaments, the diameters of the outer tin-plated copper stranded wires and the inner tin-plated copper monofilaments are 3:1 to 8:1, the winding directions of the outer tin-plated copper stranded wires and the tin-plated copper monofilaments are opposite to each other, and the winding distances are the same, the difference between the spiral angle of the outer layer tinned copper stranded wire and the spiral angle of the inner layer tinned copper monofilament is 5-20 degrees.

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

Preferably, the inner conductor is formed by twisting a plurality of tinned copper wires and a plurality of para-type wholly aromatic copolyamide drawn fiber bundles together, and the wire diameter of each tinned copper wire is 0.02mm to 0.05 mm.

Preferably, the outer diameter of the para-type wholly aromatic copolyamide drawn fiber bundle is 30 to 70% of the wire diameter of the tinned copper wire.

Preferably, the inner conductor lay length is 4 to 10 times the outer diameter of the inner conductor.

Preferably, the thickness ratio of the foamed fluororesin tape to the fluororesin extruded outer insulating layer is 1.5:1 to 3: 1.

Preferably, the density of the shielding layer of the copper wire lapping inner shielding layer and the density of the shielding layer of the copper wire lapping outer shielding layer are both 85% to 95%.

Preferably, the total thickness of the foamed fluororesin tape wrapped inner insulating layer and the fluororesin extruded outer insulating layer is 0.5mm to 2.8 mm.

Preferably, the foamed fluororesin tape wrapping inner insulating layer and the fluororesin extrusion outer insulating layer are both PFA, FEP or PTFE insulating layers.

Preferably, the polyurethane outer sheath has a thickness of 0.5mm to 2.2 mm.

The utility model has the advantages that:

1. through the copper line around package internal shield layer and the copper line around package external shield layer form shielding conductor jointly, shielding layer density is 85% to 95%, the copper line can effectually fill the copper line around package internal shield layer space around package external shield layer, reinforcing shielding performance, reduction signal attenuation improves the interference killing feature, ensures reliable and stable electrical characteristics. By optimizing the ratio of the wire diameter of the outer-layer tinned copper stranded wire to the wire diameter of the inner-layer tinned copper monofilament to be 3:1 to 8:1, the outer-layer tinned copper stranded wire and the inner-layer tinned copper monofilament are opposite in winding direction and same in winding distance, the flexibility resistance of the cable is favorably improved, wire breakage and wire breakage are not easily caused in the repeated twisting and bending process, the durability is better, the difference between the spiral angle of the outer-layer tinned copper stranded wire and the spiral angle of the inner-layer tinned copper monofilament is 5-20 degrees, the signal attenuation is favorably reduced, and the anti-interference capability is enhanced.

2. The inner conductor is formed by twisting a tinned copper wire and a para-type wholly aromatic copolyamide tensile fiber bundle, the tensile elastic modulus of the para-type wholly aromatic copolyamide tensile fiber is large, the improvement of the tensile strength of the inner conductor is facilitated, the inner conductor has high flexibility, the deformation and wire breakage phenomenon of the inner conductor is greatly reduced, the flexibility and the bending resistance are improved, the fine-diameter manufacturing of the conductor is facilitated, the stable electrical property is kept, and the durability and the use performance are better.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of the present application.

In the figure: the cable comprises an inner conductor 1, a foamed fluororesin tape wrapped inner insulating layer 2, a fluororesin extruded outer insulating layer 3, a copper wire wrapped inner shielding layer 4, a copper wire wrapped outer shielding layer 5 and a polyurethane outer sheath 6.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1, the bending-resistant thin-diameter coaxial cable according to an embodiment of the present invention includes an inner conductor 1, specifically, the inner conductor 1 is formed by twisting a plurality of tinned copper wires and a plurality of para-type wholly aromatic copolyamide drawn fiber bundles together, the diameter of the tinned copper wires is 0.02mm to 0.05mm, further, the outer diameter of the para-type wholly aromatic copolyamide drawn fiber bundles is 30% to 70% of the diameter of the tinned copper wires, and further, the lay length of the inner conductor 1 is 4 to 10 times of the outer diameter of the inner conductor 1. The outer diameter of the inner conductor 1 is not more than 1.8 mm.

The outer portion of the inner conductor 1 is sequentially coated with a foamed fluororesin belt, a wrapping inner insulating layer 2, a fluororesin extruding outer insulating layer 3, a copper wire, a wrapping inner shielding layer 4, a copper wire, a wrapping outer shielding layer 5 and a polyurethane outer sheath 6. For example, the foamed fluororesin tape wrapping inner insulating layer 2 and the fluororesin extrusion outer insulating layer 3 are both PFA, FEP or PTFE insulating layers. The total thickness of the foamed fluororesin tape wrapped inner insulating layer 2 and the fluororesin extruded outer insulating layer 3 is 0.5mm to 2.8mm, and further, the thickness ratio of the foamed fluororesin tape wrapped inner insulating layer 2 to the fluororesin extruded outer insulating layer 3 is 1.5:1 to 3: 1. The copper wire wrapped inner shielding layer 4 is formed by winding a plurality of inner tin-plated copper monofilaments in a unidirectional spiral manner, the copper wire wrapped outer shielding layer 5 is formed by winding a plurality of outer tin-plated copper strands in a unidirectional spiral manner, the outer tin-plated copper strands are formed by twisting a plurality of outer tin-plated copper monofilaments, the diameter of each inner tin-plated copper monofilament and the diameter of each outer tin-plated copper monofilament are both 0.04mm to 0.12mm, the diameter of each inner tin-plated copper monofilament is not smaller than that of each outer tin-plated copper monofilament, the diameter ratio of each outer tin-plated copper strand to each inner tin-plated copper monofilament is 3:1 to 8:1, the winding directions of the outer tin-plated copper strands and the inner tin-plated copper monofilaments are opposite and the winding distances are the same, and the difference between the spiral angle of each outer tin-plated copper strand and the spiral angle of each inner tin-plated copper monofilament is 5 degrees to 20 degrees. Preferably, the copper wire is 85% to 95% around covering internal shield layer 4 with the shielding layer density of copper wire around covering external shield layer 5. The thickness of the polyurethane outer sheath 6 is 0.5mm to 2.2 mm.

While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the claims of the present application belong to the protection scope of the present invention.

Claims

1. Bending-resistant thin-diameter coaxial cable, which is characterized in that: the cable comprises an inner conductor (1), a foamed fluororesin belt wrapping inner insulating layer (2), a fluororesin extruding wrapping outer insulating layer (3), a copper wire wrapping inner shielding layer (4), a copper wire wrapping outer shielding layer (5) and a polyurethane outer sheath (6) which are sequentially coated outside the inner conductor (1), wherein the copper wire wrapping inner shielding layer (4) is formed by winding a plurality of inner tin-plated copper monofilaments in a unidirectional spiral manner, the copper wire wrapping outer shielding layer (5) is formed by winding a plurality of outer tin-plated copper stranded wires in a unidirectional spiral manner, the outer tin-plated copper stranded wires are formed by twisting a plurality of outer tin-plated copper monofilaments, the diameter of the inner tin-plated copper monofilament and the diameter of the outer tin-plated copper monofilament are both 0.04mm to 0.12mm, the diameter of the inner tin-plated copper monofilament is not less than the diameter of the outer tin-plated copper monofilament, the diameter of the outer tin-plated copper stranded wires and the diameter of the inner tin-plated copper monofilament are 3:1 to 8:1, the winding directions of the outer-layer tinned copper stranded wire and the inner-layer tinned copper monofilament are opposite, the winding distances of the outer-layer tinned copper stranded wire and the inner-layer tinned copper monofilament are the same, and the difference between the spiral angle of the outer-layer tinned copper stranded wire and the spiral angle of the inner-layer tinned copper monofilament is 5-20 degrees.

2. The flex-resistant small diameter coaxial cable of claim 1, wherein: the outer diameter of the inner conductor (1) is not more than 1.8 mm.

3. The flex-resistant small diameter coaxial cable of claim 1, wherein: the inner conductor (1) is formed by jointly twisting a plurality of tinned copper wires and a plurality of para-type wholly aromatic copolyamide drawn fiber bundles, and the wire diameter of the tinned copper wires is 0.02mm to 0.05 mm.

4. The flex-resistant small diameter coaxial cable of claim 3, wherein: the outer diameter of the para-type wholly aromatic copolyamide drawn fiber bundle is 30-70% of the wire diameter of the tinned copper wire.

5. The flex-resistant small diameter coaxial cable of claim 3, wherein: the lay length of the inner conductor (1) is 4 to 10 times of the outer diameter of the inner conductor (1).

6. The flex-resistant small diameter coaxial cable of claim 1, wherein: the thickness ratio of the foamed fluororesin tape wrapped inner insulating layer (2) to the fluororesin extruded outer insulating layer (3) is 1.5:1 to 3: 1.

7. The flex-resistant small diameter coaxial cable of claim 1, wherein: the copper line is around package internal shield layer (4) and the shielding layer density of copper line around package external shield layer (5) is 85% to 95%.

8. The flex-resistant small diameter coaxial cable of claim 1, wherein: the total thickness of the foamed fluororesin belt wrapped inner insulating layer (2) and the fluororesin extruded outer insulating layer (3) is 0.5mm to 2.8 mm.

9. The flex-resistant small diameter coaxial cable of claim 1, wherein: the foamed fluororesin tape wrapping inner insulating layer (2) and the fluororesin extrusion outer insulating layer (3) are both PFA, FEP or PTFE insulating layers.

10. The flex-resistant small diameter coaxial cable of claim 1, wherein: the thickness of the polyurethane outer sheath (6) is 0.5mm to 2.2 mm.