Bending-resistant thin-diameter multi-core total shielding cable

Abstract

The utility model discloses a bending-resistant thin-diameter multi-core total shielding cable, which comprises a cable core formed by twisting a plurality of insulating wire cores and AFRP reinforced filling core materials together, and a PET resin wrapping layer, a silver-plated copper wire winding total shielding layer and a PFA extruded outer sheath are sequentially wrapped outside the cable core. The silver-plated copper wire wound total shielding layer is formed by spirally winding a plurality of silver-plated copper wires in parallel, the wire diameter of the silver-plated copper wires does not exceed one half of the thickness of the PFA extruded outer sheath, the ratio of the winding distance of the silver-plated copper wire wound total shielding layer to the outer diameter of the silver-plated copper wire wound total shielding layer is 6: 1-10: 1, the outer diameter of the PFA extruded outer sheath is 1-2mm, and the thickness of the PFA extruded outer sheath is 0.1-0.25 mm. On the premise of thin-diameter production and preparation of the cable, the interlayer structure is optimized, the bending resistance is improved, the stability of electrical characteristics is ensured, and the durability is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a bending-resistant thin-diameter multi-core overall shielded cable. Background Art

[0002] Multi-core cables are commonly used in medical equipment, robots, mobile drive systems, etc. Due to the rapid development of transmission technology, maintenance and testing technology, etc., multi-core cables are developing towards a trend of thinning. Under the premise of thin-diameter production and preparation, the outer diameter of the cable and the outer diameter of the insulation core become smaller, which will also reduce the bending resistance of the inner conductor and the overall shielding layer. The cable is laid and installed in a narrow internal space, and is subjected to repeated bending during operation. It is very easy for the inner conductor and the overall shielding layer to break, and the electrical characteristics deteriorate, and the durability is poor. Utility Model Content

[0003] The utility model aims to solve the technical problem of providing a bending-resistant, thin-diameter multi-core overall shielded cable in view of the deficiencies in the prior art. Under the premise of thin-diameter production and preparation, the interlayer structure is optimized, the bending resistance is improved, the stability of the electrical characteristics is ensured, and the durability is enhanced.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] A bending-resistant, thin-diameter multi-core overall shielded cable comprises a plurality of insulating cores twisted together with an AFRP reinforced filling core material to form a cable core, wherein the insulating cores are spaced apart by the AFRP reinforced filling core material, the insulating core comprises an inner conductor and a foamed PFA insulating layer, wherein the inner conductor has a diameter of 0.1 mm to 0.3 mm, and the outside of the cable core is sequentially coated with a PET resin winding layer, a silver-plated copper wire winding overall shielding layer and a PFA extruded outer sheath, wherein the silver-plated copper wire winding overall shielding layer is composed of a plurality of silver-plated copper wires spirally wound in parallel, wherein the diameter of the silver-plated copper wire does not exceed one-half of the thickness of the PFA extruded outer sheath, and the ratio of the winding pitch of the silver-plated copper wire winding overall shielding layer to the outer diameter of the silver-plated copper wire winding overall shielding layer is 6:1 to 10:1, the outer diameter of the PFA extruded outer sheath is 1 mm to 2 mm, and the thickness of the PFA extruded outer sheath is 0.1 mm to 0.25 mm.

[0006] Preferably, the diameter of the silver-plated copper wire is 0.08 mm to 0.12 mm.

[0007] Preferably, the thickness of the PET resin wrapping layer does not exceed 0.1 mm.

[0008] Preferably, the winding direction of the PET resin sheath is the same as the twisting direction of the cable core.

[0009] Preferably, the inner conductor is composed of a plurality of tinned copper single wires with a diameter of 0.01 mm to 0.04 mm stranded together.

[0010] Preferably, the PET resin wrapping layer is a multi-layer overlapping wrapping structure of PET resin tapes, and the thickness of the PET resin tapes is 8 μm to 20 μm.

[0011] Preferably, the foamed PFA insulating layer is a foamed PFA resin layer with a foaming rate of 40% to 60%.

[0012] Preferably, the silver-plated copper wire wound overall shielding layer is coated with insulating lubricating silicone grease.

[0013] Preferably, the shielding coverage rate of the silver-plated copper wire wound overall shielding layer is not less than 95%.

[0014] Advantages of the present utility model:

[0015] 1. The overall shielding layer with a silver-plated copper wire wound structure has a higher conductivity and better electrical characteristics, ensuring the stability of the shielding effect. By arranging a plurality of silver-plated copper wires side by side and spirally winding them, optimizing the wire diameter of the silver-plated copper wire not exceeding one-half of the thickness of the PFA extruded outer sheath, the ratio of the pitch of the silver-plated copper wire wound overall shielding layer to the outer diameter of the silver-plated copper wire wound overall shielding layer is 6:1 to 10:1, and the outer diameter of the PFA extruded outer sheath is 1 mm to 2 mm. On the premise that the outer diameter of the cable is smaller and the sheath thickness is thinner, it helps to inhibit the breakage of the silver-plated copper wires in the overall shielding layer, is beneficial to improving the bending resistance of the cable, ensuring a better shielding density of the overall shielding layer, enhancing the shielding performance, and improving the durability.

[0016] 2. By adding an AFRP reinforced filling core material inside the cable core, the mechanical strength and tensile elastic modulus of the AFRP reinforced filling core material are higher, which helps to withstand the tensile force when the cable undergoes repeated bending, is beneficial to inhibiting the deformation of the cable core structure, enabling the insulated cable to maintain an interval distance, being able to better withstand the lateral pressure during bending, improving the bending resistance of the cable, reducing the diameter of the inner conductor, helping to produce and prepare the cable with a smaller diameter, ensuring stable electrical characteristics, and improving the durability.

[0017] 3. By adding a PET resin wrapping layer between the cable core and the silver-plated copper wire wound overall shielding layer, the conductivity of PET is higher, and the winding direction of the PET resin wrapping layer is the same as the stranding direction of the cable core. During the bending action of the cable, it is beneficial to inhibit the loosening of the cable core, reduce the local stress concentration of the overall shielding layer, improve the noise resistance, ensure stable shielding characteristics, and have better durability. Description of the drawings

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the specific embodiments or the prior art description. Obviously, the following-described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present application.

[0020] In the figure: 1 - Insulated wire core, 2 - AFRP reinforced filling core material, 3 - Inner conductor, 4 - Foamed PFA insulation layer, 5 - PET resin wrapping layer, 6 - Silver-plated copper wire winding total shielding layer, 7 - PFA extruded outer sheath. Specific embodiments

[0021] The following will further describe the present invention in detail through specific embodiments and in combination with the drawings.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0023] Such as Figure 1 , the bend-resistant and thin-diameter multi-core total shielding cable of the embodiment of the present invention includes a cable core formed by jointly stranding a plurality of insulated wire cores 1 and AFRP reinforced filling core materials 2. The insulated wire cores 1 are kept at an interval distance through the AFRP reinforced filling core materials 2. The insulated wire core 1 includes an inner conductor 3 and a foamed PFA insulation layer 4. The diameter of the inner conductor 3 is 0.1 mm to 0.3 mm. Specifically, the inner conductor 3 is formed by stranding a plurality of tinned copper single wires with a diameter of 0.01 mm to 0.04 mm. The foamed PFA insulation layer 4 is a foamed PFA resin layer with a foaming rate of 40% to 60%.

[0024] Outside the cable core, there are successively coated with a PET resin wrapping layer 5, a silver-plated copper wire winding total shielding layer 6, and a PFA extrusion outer sheath 7. Further, the silver-plated copper wire winding total shielding layer 6 is coated with insulating lubricating silicone grease. The thickness of the PET resin wrapping layer 5 does not exceed 0.1 mm. The winding direction of the PET resin wrapping layer 5 is the same as the stranding direction of the cable core. In a specific embodiment, the PET resin wrapping layer 5 is a multi-layer overlapping wrapping structure of PET resin tapes, and the thickness of the PET resin tapes is 8 μm to 20 μm. In a specific embodiment, the silver-plated copper wire winding total shielding layer 6 is composed of several silver-plated copper wires wound in parallel spirals. The wire diameter of the silver-plated copper wire does not exceed one-half of the thickness of the PFA extrusion outer sheath 7. The ratio of the pitch of the silver-plated copper wire winding total shielding layer 6 to the outer diameter of the silver-plated copper wire winding total shielding layer 6 is 6:1 to 10:1, and the wire diameter of the silver-plated copper wire is 0.08 mm to 0.12 mm. The shielding coverage rate of the silver-plated copper wire winding total shielding layer 6 is not less than 95%. The outer diameter of the PFA extrusion outer sheath 7 is 1 mm to 2 mm, and the thickness of the PFA extrusion outer sheath 7 is 0.1 mm to 0.25 mm.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-core total shielded cable with a fine diameter and bending resistance, characterized in that: It includes a cable core formed by stranding a number of insulated wire cores (1) and an AFRP reinforced filler core material (2) together. The insulated wire cores (1) are kept at an interval distance through the AFRP reinforced filler core material (2). The insulated wire core (1) includes an inner conductor (3) and a foamed PFA insulating layer (4). The diameter of the inner conductor (3) is 0.1 mm to 0.3 mm. The outside of the cable core is successively coated with a PET resin wrapping layer (5), a silver-plated copper wire winding overall shielding layer (6), and a PFA extruded outer sheath (7). The silver-plated copper wire winding overall shielding layer (6) is formed by parallel spiral winding of a number of silver-plated copper wires. The wire diameter of the silver-plated copper wire does not exceed one-half of the thickness of the PFA extruded outer sheath (7). The ratio of the pitch of the silver-plated copper wire winding overall shielding layer (6) to the outer diameter of the silver-plated copper wire winding overall shielding layer (6) is 6:1 to 10:

1. The outer diameter of the PFA extruded outer sheath (7) is 1 mm to 2 mm, and the thickness of the PFA extruded outer sheath (7) is 0.1 mm to 0.25 mm.

2. The flexure-resistant and miniaturized multi-core overall shielded cable according to claim 1, wherein: The wire diameter of the silver-plated copper wire is 0.08 mm to 0.12 mm.

3. The bend-resistant multi-core total shielded cable with reduced diameter according to claim 1, characterized in that: The thickness of the PET resin wrapping layer (5) does not exceed 0.1 mm.

4. The bend-resistant small-diameter multi-core overall shielded cable according to claim 1, characterized in that: The winding direction of the PET resin wrapping layer (5) is the same as the stranding direction of the cable core.

5. The bend-resistant and thin-diameter multi-core overall shielded cable according to claim 1, characterized in that: The inner conductor (3) is formed by stranding a number of tinned copper single wires with a diameter of 0.01 mm to 0.04 mm.

6. The bend-resistant fine-diameter multi-core overall shielded cable according to claim 1, wherein: The PET resin wrapping layer (5) is a multi-layer overlapping wrapping structure of PET resin tapes, and the thickness of the PET resin tape is 8 μm to 20 μm.

7. The bend-resistant multi-core general shielded cable with a reduced diameter according to claim 1, characterized in that: The foamed PFA insulating layer (4) is a foamed PFA resin layer with a foaming rate of 40% to 60%.

8. The bend-resistant small-diameter multi-core overall shielded cable according to claim 1, characterized in that: The silver-plated copper wire winding overall shielding layer (6) is coated with insulating lubricating silicone grease.

9. The bend-resistant small-diameter multi-core overall shielded cable according to claim 1, characterized in that: The shielding coverage rate of the silver-plated copper wire winding overall shielding layer (6) is not less than 95%.

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