Small-diameter anti-attenuation miniature coaxial cable

Abstract

The utility model discloses a small-diameter anti-attenuation miniature coaxial cable, which comprises a stainless steel monofilament conductor, and a silver-plated copper net conductor layer formed by weaving and pressing a plurality of silver-plated copper monofilaments with the wire diameter of 0.01-0.02 mm on the outer surface of the stainless steel monofilament conductor. A PFA insulating layer, a fan-shaped silver-plated copper wire winding inner shielding layer, a tin-plated outer shielding layer, a ferrite film inner cushion layer and a PFA extruded sheath layer are sequentially coated outside the copper net conductor layer, the fan-shaped silver-plated copper wire winding inner shielding layer is of a structure in which a plurality of fan-shaped silver-plated copper wires are spirally wound side by side, the outer diameter of the PFA insulating layer is 0.4 mm to 0.45 mm, and the outer diameter of the PFA extruded sheath layer is 0.8 mm to 0.85 mm. The miniature coaxial cable is better in bending resistance, good in attenuation resistance, higher in external electromagnetic interference resistance and better in durability, and the conductor and the shielding layer are not prone to wire breakage.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a thin-diameter anti-attenuation micro coaxial cable. Background Art

[0002] Coaxial cable is one of the main types of wires and cables. The industrial application site environment is complex, and the radiation or conduction of electromagnetic noise (EMI) may seriously interfere with the normal operation of the equipment. In this process, an important carrier of electromagnetic noise propagation is the various cables used in the production line equipment. In the automated industrial manufacturing production line, the electrical connection and control of small robots, electronic machines, etc. need to be applied to micro coaxial cables. However, the shielding layer of the micro coaxial cable is usually a metal wire wrapped shielding structure. The gaps formed between the metal wires cause a large attenuation of the transmitted signal, and the noise shielding effect is not very ideal. Moreover, the metal wires of the conductor and the shielding layer are mostly soft copper wires or tinned copper wires and are thin, with poor flexibility and bending resistance. They are easy to break and are not durable. Utility Model Content

[0003] The present application aims to solve the technical problem of providing a thin-diameter anti-attenuation micro-coaxial cable by thinning the diameter to form a micro-coaxial cable structure with better bending resistance. The conductor and the shielding layer are not easy to break, the anti-attenuation performance is good, the resistance to external electromagnetic interference is stronger, and the durability is better.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] The thin-diameter anti-attenuation micro coaxial cable comprises a stainless steel monofilament conductor, on the outer surface of which a plurality of silver-plated copper monofilaments with a wire diameter of 0.01 mm to 0.02 mm are woven and pressed to form a silver-plated copper mesh conductor layer, the outside of which is sequentially coated with a PFA insulation layer, a fan-shaped silver-plated copper wire-wound inner shielding layer, a tin-plated outer shielding layer, a ferrite film inner cushion layer and a PFA extruded sheath layer, the fan-shaped silver-plated copper wire-wound inner shielding layer is a structure of a plurality of fan-shaped silver-plated copper wires spirally wound side by side, the outer diameter of the PFA insulation layer is 0.4 mm to 0.45 mm, and the outer diameter of the PFA extruded sheath layer is 0.8 mm to 0.85 mm.

[0006] Preferably, the shielding coverage of the inner shielding layer wrapped with the fan-shaped silver-plated copper wire is not less than 95%.

[0007] Preferably, the thickness of the tin-plated outer shielding layer is not less than 25% of the thickness of the fan-shaped silver-plated copper wire-wound inner shielding layer.

[0008] Preferably, the PFA insulation layer comprises a foamed PFA extruded inner insulation layer and two to three layers of PFA wrapped outer insulation layers.

[0009] Preferably, the thickness of the foamed PFA extruded inner insulation layer is 2 to 4 times the thickness of the PFA wrapped outer insulation layer.

[0010] Preferably, the diameter of the silver-plated copper monofilament is smaller than the diameter of the stainless steel monofilament conductor.

[0011] Preferably, the thickness of the inner cushion layer of the ferrite film is 0.03 mm to 0.05 mm.

[0012] Preferably, a thermoplastic EVA adhesive layer is provided on the inner surface of the PFA extruded sheath layer.

[0013] Preferably, the fan-shaped silver-plated copper wire is wrapped around the outer surface of the inner shielding layer and electroplated to form the tin-plated outer shielding layer, and the thickness of the tin-plated outer shielding layer is 10 μm to 20 μm.

[0014] Beneficial effects of this application:

[0015] 1. By replacing the original round silver-plated copper wire winding structure and improving it to an inner shielding layer with a fan-shaped silver-plated copper wire spirally wound side by side, it is helpful to prepare a thinner diameter. The gaps formed between the silver-plated copper wires are smaller, which is beneficial to reducing signal attenuation and improving anti-attenuation performance. It has better flexibility and mechanical strength. The fan-shaped silver-plated copper wires spirally wound side by side are tightly connected into a whole through a tin-plated outer shielding layer, which greatly improves the bending resistance and effectively avoids the loosening and broken wires of the fan-shaped silver-plated copper wires. The tin-plated outer shielding layer penetrates into the gaps formed between the silver-plated copper wires to increase the shielding density and enhance the shielding performance, which helps to reduce signal attenuation, improve anti-attenuation performance, enhance anti-interference ability, and ensure stable and reliable electrical characteristics.

[0016] 2. Using a stainless steel monofilament conductor as the inner core helps to improve the mechanical strength and bending resistance of the inner conductor. The outer surface of the stainless steel monofilament conductor is woven and pressed by silver-plated copper monofilaments to form a silver-plated copper mesh conductor layer. The silver-plated copper mesh conductor layer with a close-fitting structure has better flexibility and bending resistance, will not become loose, reduces the occurrence of wire breakage, and has better durability and applicability.

[0017] 3. The ferrite film inner cushion layer and the PFA extruded sheath layer are bonded together by the adhesive layer. When bent, the PFA extruded sheath layer and the ferrite film inner cushion layer maintain the same degree of bending and fit closely to the shielding layer, which inhibits the shielding layer from bearing excessive load locally and reduces the local stress concentration of the shielding layer, which helps to improve the stability of the shielding effect and ensure durable application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0019] Description of reference numerals:

[0020] 1-stainless steel single wire conductor, 2-silver-plated copper mesh conductor layer, 3-PFA insulation layer, 4-fan-shaped silver-plated copper wire wrapped inner shield layer, 5-tinned outer shield layer, 6-ferrite film inner cushion layer, 7-PFA extruded sheath layer. DETAILED DESCRIPTION

[0021] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] See also Figure 1 The thin-diameter anti-attenuation micro coaxial cable of the embodiment of the present application comprises a stainless steel monofilament conductor 1, on the outer surface of the stainless steel monofilament conductor 1, a plurality of silver-plated copper monofilaments with a wire diameter of 0.01 mm to 0.02 mm are woven and pressed to form a silver-plated copper mesh conductor layer 2, further, the wire diameter of the silver-plated copper monofilament is smaller than the diameter of the stainless steel monofilament conductor 1. The copper mesh conductor layer 2 is coated with a PFA insulation layer 3, a fan-shaped silver-plated copper wire winding inner shielding layer 4, a tin-plated outer shielding layer 5, a ferrite film inner cushion layer 6 and a PFA extruded sheath layer 7 in sequence, further, the inner surface of the PFA extruded sheath layer 7 is provided with a thermoplastic EVA adhesive layer.

[0023] The outer diameter of the PFA insulation layer 3 is 0.4mm to 0.45mm. Specifically, the PFA insulation layer 3 includes a foamed PFA extruded inner insulation layer and two to three layers of PFA wrapped outer insulation layers. Further, the thickness of the foamed PFA extruded inner insulation layer is 2 to 4 times the thickness of the PFA wrapped outer insulation layer. The fan-shaped silver-plated copper wire wound inner shielding layer 4 is a structure of several fan-shaped silver-plated copper wires wound in a spiral manner, and the shielding coverage rate is not less than 95%. The thickness of the tin-plated outer shielding layer 5 is not less than 25% of the thickness of the fan-shaped silver-plated copper wire wound inner shielding layer 4. Specifically, the outer surface of the fan-shaped silver-plated copper wire wound inner shielding layer 4 is electroplated to form the tin-plated outer shielding layer 5, and the thickness of the tin-plated outer shielding layer 5 is 10μm to 20μm. The thickness of the ferrite film inner cushion layer 6 is 0.03mm to 0.05mm. The outer diameter of the PFA extruded sheath layer 7 is 0.8mm to 0.85mm.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Thin-diameter anti-attenuation micro coaxial cable, characterized by: The invention comprises a stainless steel monofilament conductor (1), on the outer surface of which a plurality of silver-plated copper monofilaments with a wire diameter of 0.01 mm to 0.02 mm are woven and pressed to form a silver-plated copper mesh conductor layer (2), the outer surface of which is sequentially covered with a PFA insulation layer (3), a fan-shaped silver-plated copper wire-wound inner shielding layer (4), a tin-plated outer shielding layer (5), a ferrite film inner cushion layer (6) and a PFA extruded sheath layer (7), wherein the fan-shaped silver-plated copper wire-wound inner shielding layer (4) is a structure of a plurality of fan-shaped silver-plated copper wires spirally wound side by side, the outer diameter of the PFA insulation layer (3) is 0.4 mm to 0.45 mm, and the outer diameter of the PFA extruded sheath layer (7) is 0.8 mm to 0.85 mm.

2. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1 is characterized in that: The shielding coverage rate of the inner shielding layer (4) wound with the fan-shaped silver-plated copper wire is not less than 95%.

3. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1 is characterized in that: The thickness of the tin-plated outer shielding layer (5) is not less than 25% of the thickness of the fan-shaped silver-plated copper wire-wound inner shielding layer (4).

4. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1 is characterized in that: The PFA insulating layer (3) comprises a foamed PFA extruded inner insulating layer and two to three layers of PFA wrapped outer insulating layers.

5. The thin-diameter anti-attenuation micro-coaxial cable according to claim 4 is characterized in that: The thickness of the foamed PFA extruded inner insulation layer is 2 to 4 times the thickness of the PFA wrapped outer insulation layer.

6. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1 is characterized in that: The diameter of the silver-plated copper monofilament is smaller than the diameter of the stainless steel monofilament conductor (1).

7. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1 is characterized in that: The thickness of the ferrite film inner cushion layer (6) is 0.03 mm to 0.05 mm.

8. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1 is characterized in that: The inner surface of the PFA extruded sheath layer (7) is provided with a thermoplastic EVA adhesive layer.

9. The thin-diameter anti-attenuation micro-coaxial cable according to claim 1, characterized in that: The outer surface of the inner shielding layer (4) wrapped with the fan-shaped silver-plated copper wire is electroplated to form the tin-plated outer shielding layer (5), and the thickness of the tin-plated outer shielding layer (5) is 10 μm to 20 μm.

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