Small-diameter light-weight two-core shielding differential signal cable

Abstract

Five ETFE resin core strips are arranged in an X shape to form an isolation core material, two inner conductors are symmetrically arranged on the two sides of the isolation core material and are twisted together to form a cable core, the outer diameter of the ETFE resin core strips is the same as the outer diameter of the inner conductors, the outer diameter of the inner conductors ranges from 0.1 mm to 0.3 mm, the inner conductors comprise oxygen-free copper monofilament inner cores, and the oxygen-free copper monofilament inner cores are arranged on the two sides of the isolation core material. A plurality of silver-plated copper wires are woven and tightly pressed outside the oxygen-free copper monofilament inner core to form a copper net conductor layer, and the cable core is sequentially coated with an irradiation crosslinking low-density polyethylene extruded inner sheath layer, a conductive fiber winding shielding layer and an irradiation crosslinking high-density polyethylene outer sheath layer. The cable is better in flexibility and bending resistance, reduces conductor wire breakage, is manufactured based on small diameter and light weight, removes a metal shielding layer, reduces the use amount of copper wires, reduces the manufacturing cost, and is stable in shielding performance and durable in use.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular relates to a thin-diameter and lightweight 2-core shielded differential signal cable. Background Art

[0002] In automated industrial production lines, shielded cables are often used in robots, mobile drive systems, etc. Due to the rapid development of transmission technology, maintenance and testing technology, communication cables are gradually becoming thinner and lighter. However, existing shielded cables usually use a metal braided shielding structure, which uses a lot of copper wire, is heavy, and has a high manufacturing cost, which is not conducive to lightweight production. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a thin-diameter and lightweight 2-core shielded differential signal cable with better flexibility and bending resistance, reduced conductor breakage, and based on thin-diameter and lightweight manufacturing, the metal shielding layer is removed, the amount of copper wire used is reduced, the manufacturing cost is reduced, the shielding performance is stable, and the cable is durable.

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

[0005] A thin-diameter, lightweight, 2-core shielded differential signal cable, wherein five ETFE resin core strips are arranged in an X shape to form an isolation core material, and two inner conductors are symmetrically arranged on both sides of the isolation core material and twisted together to form a cable core. The outer diameter of the ETFE resin core strip is the same as the outer diameter of the inner conductor, and the outer diameter of the inner conductor is 0.1 mm to 0.3 mm. The inner conductor comprises an oxygen-free copper monofilament inner core, and a copper mesh conductor layer is formed by weaving and pressing a plurality of silver-plated copper wires on the outside of the oxygen-free copper monofilament inner core. The outside of the cable core is sequentially coated with an irradiated cross-linked low-density polyethylene extruded inner sheath layer, a conductive fiber wound shielding layer and an irradiated cross-linked high-density polyethylene outer sheath layer.

[0006] Preferably, the total thickness of the radiation cross-linked low-density polyethylene extruded inner sheath layer and the radiation cross-linked high-density polyethylene outer sheath layer is 0.2 mm to 0.3 mm.

[0007] Preferably, the inner core diameter of the oxygen-free copper monofilament is 0.05 mm to 0.1 mm.

[0008] Preferably, the diameter of the silver-plated copper wire is 0.02 mm to 0.08 mm.

[0009] Preferably, the conductive fiber winding shielding layer is a structure of a plurality of conductive fiber bundles spirally wound in parallel, and the conductive fiber bundles are formed by twisting two polyacrylonitrile-based carbon fibers of different wire diameters and coating them with a copper conductive coating.

[0010] Preferably, the diameter of the polyacrylonitrile-based carbon fiber does not exceed 20 μm.

[0011] Preferably, the conductive fiber bundle has a wire diameter of 0.01 mm to 0.05 mm.

[0012] Preferably, the braiding density of the conductive fiber wrapped around the shielding layer is 95% to 98%.

[0013] Preferably, the weaving density of the copper mesh conductor layer is not less than 95%.

[0014] Beneficial effects of this application:

[0015] 1. The inner core of the inner conductor is made of oxygen-free copper monofilament, and the copper mesh conductor layer is formed by weaving and pressing silver-plated copper wire on the outside of the oxygen-free copper monofilament. The copper mesh conductor layer with a close-fitting structure will not be loose, which helps to prevent the inner conductor from breaking, is conducive to the thin-diameter manufacturing of the inner conductor, has better flexibility and bending resistance, and is durable.

[0016] 2. Five ETFE resin core strips are arranged to form an X-shaped isolation core material. The ETFE resin core strip provides friction reduction, which is beneficial to reducing the contact friction between the inner conductor and the isolation core material and the insulation layer. The isolation core material can effectively withstand the lateral pressure during bending, relieve the stress concentration of the conductor, help reduce the breakage of the inner conductor, improve the flexibility and bending resistance of the cable, and is conducive to the thin-diameter manufacturing of the inner conductor, ensuring the stability of the electrical characteristics and durable application.

[0017] 3. The conductive fiber-wound shielding layer replaces the original metal shielding layer to achieve lightweight manufacturing. The conductive fiber bundles of the conductive fiber-wound shielding layer are formed by twisting polyacrylonitrile-based carbon fibers and coating them with copper conductive coatings. This ensures stable shielding performance, helps reduce cable weight, reduces costs, and achieves the requirements of thin-diameter and lightweight production.

[0018] 4. The outer diameter of the ETFE resin core strip is the same as that of the inner conductor, which helps the cable core maintain a circular cross-section and is conducive to thin-diameter manufacturing. The inner conductor insulation layer is replaced by an X-shaped isolation core material to isolate the two inner conductors. The outer diameter of the ETFE resin core strip is 0.1mm to 0.3mm, which ensures an effective insulation isolation distance between the two inner conductors and ensures stable insulation electrical properties. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Description of reference numerals:

[0021] 1-isolating core material, 2-inner conductor, 3-oxygen-free copper monofilament inner core, 4-copper mesh conductor layer, 5-irradiation cross-linked low-density polyethylene extruded inner sheath layer, 6-conductive fiber winding shielding layer, 7-irradiation cross-linked high-density polyethylene outer sheath layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] See also Figure 1 In the embodiment of the present application, the thin-diameter lightweight 2-core shielded differential signal cable has five ETFE resin core strips arranged in an X shape to form an isolation core material 1, and two inner conductors 2 are symmetrically arranged on both sides of the isolation core material 1 and twisted together to form a cable core. The outer diameter of the ETFE resin core strip is the same as the outer diameter of the inner conductor 2, and the outer diameter of the inner conductor 2 is 0.1mm to 0.3mm. The inner conductor 2 includes an oxygen-free copper monofilament inner core 3, and a copper mesh conductor layer 4 is formed by weaving and pressing a plurality of silver-plated copper wires on the outside of the oxygen-free copper monofilament inner core 3. Furthermore, the weaving density of the copper mesh conductor layer 4 is not less than 95%. Specifically, the diameter of the oxygen-free copper monofilament inner core 3 is 0.05mm to 0.1mm, and the diameter of the silver-plated copper wire is 0.02mm to 0.08mm.

[0024] The cable core is coated with an irradiated cross-linked low-density polyethylene extruded inner sheath layer 5, a conductive fiber winding shielding layer 6 and an irradiated cross-linked high-density polyethylene outer sheath layer 7 in sequence. In one embodiment, the conductive fiber winding shielding layer 6 is a parallel spiral winding structure of several conductive fiber bundles, and the conductive fiber bundles are formed by twisting two polyacrylonitrile-based carbon fibers of different wire diameters and coating them with a copper conductive coating. Furthermore, the wire diameter of the polyacrylonitrile-based carbon fibers does not exceed 20μm, and the wire diameter of the conductive fiber bundle is 0.01mm to 0.05mm. The braiding density of the conductive fiber winding shielding layer 6 is 95% to 98%. The total thickness of the irradiated cross-linked low-density polyethylene extruded inner sheath layer 5 and the irradiated cross-linked high-density polyethylene outer sheath layer 7 is 0.2mm to 0.3mm.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Thin-diameter and lightweight 2-core shielded differential signal cable, characterized by: Five ETFE resin core strips are arranged in an X shape to form an isolation core material (1); two inner conductors (2) are symmetrically arranged on both sides of the isolation core material (1) and twisted together to form a cable core; the outer diameter of the ETFE resin core strip is the same as the outer diameter of the inner conductor (2); the outer diameter of the inner conductor (2) is 0.1 mm to 0.3 mm; the inner conductor (2) comprises an oxygen-free copper monofilament inner core (3); a copper mesh conductor layer (4) is formed by weaving and pressing a plurality of silver-plated copper wires outside the oxygen-free copper monofilament inner core (3); and the outer part of the cable core is sequentially coated with an irradiated cross-linked low-density polyethylene extruded inner sheath layer (5), a conductive fiber winding shielding layer (6), and an irradiated cross-linked high-density polyethylene outer sheath layer (7).

2. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 1 is characterized by: The radiation cross-linked low-density polyethylene extruded inner sheath layer (5) and the radiation cross-linked high-density polyethylene outer sheath layer (7) have a total thickness of 0.2 mm to 0.3 mm.

3. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 1 is characterized by: The diameter of the oxygen-free copper monofilament inner core (3) is 0.05 mm to 0.1 mm.

4. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 1 is characterized by: The diameter of the silver-plated copper wire is 0.02 mm to 0.08 mm.

5. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 1 is characterized by: The conductive fiber winding shielding layer (6) is a structure of a plurality of conductive fiber bundles being spirally wound in parallel, wherein the conductive fiber bundles are formed by twisting two polyacrylonitrile-based carbon fibers of different wire diameters and coating them with a copper conductive coating.

6. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 5 is characterized by: The diameter of the polyacrylonitrile-based carbon fiber does not exceed 20 μm.

7. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 5 is characterized by: The conductive fiber bundle has a line diameter of 0.01 mm to 0.05 mm.

8. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 1 is characterized by: The braiding density of the conductive fiber wound shielding layer (6) is 95% to 98%.

9. The thin-diameter and lightweight two-core shielded differential signal cable according to claim 1, characterized in that: The weaving density of the copper mesh conductor layer (4) is not less than 95%.

Images