Flexible small-pitch shielding cable

Abstract

The utility model discloses a soft type small-pitch shielding cable, and relates to the field of shielding cables, the soft type small-pitch shielding cable comprises a cable core, a shielding layer and an outer sheath layer are sequentially arranged outside the cable core from inside to outside, the cable core is formed by twisting a plurality of conductors in the right direction, the conductors are formed by bunching soft copper conductors, and the outer sheath layer is arranged outside the shielding layer. And the designed pitch diameter ratio of the cable core is not greater than 8 times of the stranding outer diameter of the cable. According to the invention, the conductors are the multi-strand stranded soft copper conductors, so that the flexibility of the cable is improved, the stranding pitch of the cable is small, the smaller the pitch of stranded wires of the same specification is, the shorter the moving distance of a single wire is when the stranded wires are bent, the smaller the friction force is, the softer the stranded wires are, the flexibility of the shielded cable is effectively improved, and the pitch of the shielded cable is reduced.

Description

Technical Field

[0001] The present application relates to the field of shielded cables, and in particular to a flexible small-pitch shielded cable. Background Art

[0002] Shielded cables are mainly used in copper-core weather-resistant and UV-proof shielded lines for anti-interference electrical appliances, instruments, electronic equipment and automation devices, providing certain conveniences for building an information society.

[0003] Most of the current shielded cables use traditional materials and structural designs. Although they meet the use requirements to a certain extent, they use harder materials in order to achieve shielding effects, which results in poor cable flexibility and difficulty in flexible installation in a small space. At the same time, the larger pitch also limits the transmission efficiency and performance stability of the cable. Utility Model Content

[0004] In order to improve the flexibility of a shielded cable and reduce the pitch of the shielded cable, the present application provides a flexible small-pitch shielded cable.

[0005] The present application provides a flexible small-pitch shielded cable, which adopts the following technical solution:

[0006] A flexible small-pitch shielded cable comprises a cable core, wherein a shielding layer and an outer sheath layer are sequentially arranged on the outside of the cable core from the inside to the outside, the cable core is made of a plurality of conductors twisted in the right direction, the conductors are bundled with soft copper conductors, and the designed pitch-diameter ratio of the cable core is not greater than 8 times the outer diameter of the twisted cable.

[0007] By adopting the above technical solution, since the conductor is a multi-strand twisted soft copper conductor, the flexibility of the cable is improved. At the same time, the cable twisting pitch is small. For stranded wires of the same specification, the smaller the pitch, the shorter the distance a single wire moves when the stranded wire is bent, the smaller the friction, and the softer the stranded wire. The flexibility of the shielded cable is effectively improved while reducing the pitch of the shielded cable.

[0008] Preferably, the soft copper conductor is a Class 5 soft copper conductor.

[0009] By adopting the above technical solution, the Class 5 soft copper conductor is composed of soft round copper wires bundled and twisted, the nominal diameter of which is no more than φ0.31mm, and it is soft and easy to bend. This makes the conductor more flexible and convenient during wiring, installation and maintenance, and can adapt to various complex installation environments.

[0010] Preferably, each of the conductors is provided with an insulating layer, the insulating layer comprising a core layer and an outer layer arranged in sequence from the inside to the outside of the conductor, and the insulating layer is made by multi-layer co-extrusion;

[0011] The core layer is used to improve the softness of the insulating layer, and the outer layer is used to improve the softness and mechanical strength of the insulating layer.

[0012] By adopting the above technical solution, a core layer and an outer layer are provided, thereby further increasing the softness and mechanical strength of the insulating layer.

[0013] Preferably, an intermediate layer is provided between the core layer and the outer layer, and the intermediate layer is used to improve the flame retardancy and high temperature resistance of the insulating layer.

[0014] By adopting the above technical solution, the flame retardant and high temperature resistance of the insulation layer is further improved. The middle layer is made of flame retardant modified polyolefin material, which can further improve the high temperature resistance of the insulation layer and is more suitable for working in high temperature environments.

[0015] Preferably, the core layer is made of soft and environmentally friendly polyvinyl chloride insulating material, and the outer layer is made of thermoplastic elastomer material.

[0016] By adopting the above technical solutions, the soft and environmentally friendly polyvinyl chloride insulation material has excellent flexibility, allowing the wires and cables to be easily bent and stretched during use, adapting to various complex wiring requirements. At the same time, it has excellent electrical properties, can effectively isolate current, and prevent safety hazards such as leakage and short circuit. This ensures the safety and stability of wires and cables during normal operation.

[0017] Preferably, the middle layer is made of flame retardant modified polyolefin material.

[0018] By adopting the above technical solution, the addition of flame retardants can slow down the burning speed of polyolefin materials during combustion, reduce the incidence of fire accidents, and improve flame retardant properties. At the same time, the addition of flame retardants does not weaken the mechanical properties of polyolefins, but may enhance their wear resistance, meeting the occasions with high requirements for strength and wear resistance.

[0019] Preferably, plasticizer and softener are added into the insulating layer.

[0020] By adopting the above technical solution, a plasticizer is selected that can reduce the glass transition temperature of the insulating material and increase its flexibility and plasticity; a softener that can improve the softness of the insulating material is selected to ensure that it maintains good softness during use.

[0021] Preferably, a filling layer is provided between the cable core and the shielding layer, and the filling layer is made of non-hygroscopic PP tape.

[0022] By adopting the above technical solution, adding a filling layer can effectively improve the roundness of the cable.

[0023] Preferably, the shielding layer is woven from soft fine copper wires drawn and annealed from high-quality oxygen-free copper, and the weaving density of the shielding layer is greater than 80%.

[0024] By adopting the above technical solution, when the cable carries a certain current or load, a magnetic field will be generated around the cable, and the shielding layer can shield this electromagnetic field inside the cable to achieve a shielding effect. At the same time, it can also play a certain grounding protection role. If the cable core is damaged, the leaked current can flow along the shielding layer to the grounding grid, playing a role of safety protection.

[0025] Preferably, the outer sheath layer is made of environmentally friendly elastomeric polyvinyl chloride material.

[0026] By adopting the above technical solution, polyvinyl chloride has good chemical stability, acid and alkali resistance and aging resistance, which effectively improves the durability of the cable.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. By setting the conductor as a multi-stranded soft copper conductor, the flexibility of the cable is improved. At the same time, the cable twisting pitch is small. For the same specification of stranded wire, the smaller the pitch, the shorter the distance the single wire moves when the stranded wire is bent, the smaller the friction, and the softer the stranded wire, which effectively improves the flexibility of the shielded cable while reducing the pitch of the shielded cable;

[0029] 2. With the help of the core layer and the outer layer, the softness and mechanical strength of the insulation layer are further increased;

[0030] 3. With the help of the middle layer, the flame retardant and high temperature resistance of the insulation layer is further improved. The middle layer is made of polyolefin material modified by flame retardant, which can further improve the high temperature resistance of the insulation layer and is more suitable for working in high temperature occasions;

[0031] 4. Adding plasticizers and softeners to the insulation layer can reduce the glass transition temperature of the insulation material, increase its flexibility and plasticity, and ensure that it maintains good softness during use;

[0032] 5. The added shielding structure plays a dual role in shielding electromagnetic fields and protecting grounding, reducing the degree of signal interference and improving cable transmission performance;

[0033] 6. The outer sheath layer adopts environmentally friendly elastic polyvinyl chloride soft sheath, and the overall bending performance of the cable is excellent, which is easy to lay. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram mainly showing the overall structure of the shielded cable in this embodiment;

[0035] Figure 2 FIG. 4 is a schematic diagram mainly showing the structure of the insulating layer in this embodiment.

[0036] Figure numerals: 1, cable core; 11, conductor; 12, insulation layer; 121, core layer; 122, intermediate layer; 123, outer layer; 2, filling layer; 3, shielding layer; 4, outer sheath layer. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings.

[0038] The embodiment of the present application discloses a flexible small-pitch shielded cable.

[0039] Reference Figure 1 The flexible small pitch shielded cable comprises a cable core 1, a filling layer 2, a shielding layer 3 and an outer sheath layer 4 which are arranged from the inside to the outside. The cable core 1 is formed by twisting a plurality of conductors 11, and the filling layer 2 is wrapped around the cable core 1.

[0040] Reference Figure 1 and Figure 2 The cable core 1 is made of a plurality of conductors 11 twisted in the right direction, and an insulating layer 12 is arranged outside each conductor 11. The insulating layer 12 includes a core layer 121, an intermediate layer 122 and an outer layer 123 arranged from the inside to the outside of the conductor 11, and the insulating layer 12 is made of multi-layer co-extrusion. The insulation eccentricity of the insulating layer 12 is ≤10%, and the nominal insulation thickness is the process requirement value. The thinnest point of the insulating layer 12 is not less than the nominal value × 90%-0.1mm, and the surface is required to be smooth, free of old glue, scratches and other defects. In this embodiment, the conductor 11 adopts a Class 5 soft copper conductor 11, which is drawn with a high-quality oxygen-free copper rod. The conductor 11 is round, has a smooth surface and is free of burrs. For stranded wires with the same cross-sectional area, the more single wires there are, the softer the stranded wire is.

[0041] Specifically, the cable core 1 is twisted in a right-hand twisting manner, and the designed pitch-to-diameter ratio is no more than 8 times the outer diameter of the cable twisting. The cable has a small pitch, a soft structure, and excellent bending performance, which greatly reduces the degree of signal interference. At the same time, if the user frequently bends during use, the single-line moving distance will be shorter, the internal friction of the cable will be smaller, and the cable core 1 is relatively soft as a whole.

[0042] The core layer 121 is used to improve the softness of the insulating layer 12. In this embodiment, the core layer 121 is made of soft and environmentally friendly polyvinyl chloride insulating material. The middle layer 122 is used to improve the flame retardant and high temperature resistance of the insulating layer 12. The middle layer 122 is made of flame retardant modified polyolefin material, which can further improve the high temperature resistance of the insulating layer 12 and is more suitable for working in high temperature environments.

[0043] The outer layer 123 is used to improve the softness and mechanical strength of the insulating layer 12. The outer layer 123 is made of a thermoplastic elastomer material. The thermoplastic elastomer material combines the elasticity of rubber and the processability of plastic, has good softness and wear resistance, and is suitable for applications in high temperature or complex environments.

[0044] It should also be noted that plasticizers and softeners can also be added during the preparation of the insulating layer 12. Specifically, a plasticizer that can reduce the glass transition temperature of the insulating material and increase its flexibility and plasticity is selected; a softener that can improve the softness of the insulating material is selected to ensure that it maintains good softness during use. During the preparation of the insulating material, the plasticizer or softener is added to the basic insulating material in a certain proportion and mixed evenly. Ensure that the additives are fully integrated with the basic material to avoid stratification or unevenness.

[0045] The filling layer 2 is made of non-hygroscopic PP tape, and the roundness of the cable is ensured and improved by wrapping. In other embodiments, the filling layer 2 can also be made of non-hygroscopic flame retardant material.

[0046] The shielding layer 3 is woven from soft and fine copper wires drawn and annealed from high-quality oxygen-free copper, with a braiding density of more than 80%. When the cable carries a certain current or load, a magnetic field will be generated around the cable, and the shielding layer 3 can shield this electromagnetic field inside the cable to achieve a shielding effect. In addition, it can also play a certain grounding protection role. If the cable core 1 is damaged, the leaked current can flow along the shielding layer 3 into the grounding network, playing a role in safety protection.

[0047] The outer sheath layer 4 is made of environmentally friendly elastic polyvinyl chloride material. The average thickness of the outer sheath of the cable should not be less than the nominal value, and the minimum value should not be less than 85%-0.1mm of the nominal value. The sheath has good impact strength and wear resistance, as well as certain oil resistance and chemical resistance. Polyvinyl chloride has good chemical stability, acid and alkali resistance and aging resistance.

[0048] It should also be noted that, in this embodiment, the cable core 1 can be marked in red or blue, or it can be agreed upon according to customer needs.

[0049] The implementation principle of a soft small pitch shielded cable in the embodiment of the present application is as follows: since the conductor 11 is a multi-stranded soft copper conductor 11, the flexibility of the cable is improved. The insulation adopts soft and environmentally friendly polyvinyl chloride insulation material, which increases the flame retardant and wear resistance of the cable. The cable twisting pitch is small and the structure is soft. The added shielding structure plays a dual role of shielding the electromagnetic field and protecting the grounding, reducing the interference of the signal and improving the transmission performance of the cable. The sheath is an environmentally friendly elastomeric polyvinyl chloride soft sheath, and the overall bending performance of the cable is excellent and easy to lay.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flexible small-pitch shielded cable, comprising a cable core (1), wherein a shielding layer (3) and an outer sheath layer (4) are sequentially arranged on the outside of the cable core (1) from the inside to the outside, characterized in that: The cable core (1) is made of a plurality of conductors (11) twisted in the right direction, the conductors (11) are bundled with soft copper conductors (11), and the designed pitch-diameter ratio of the cable core (1) is not greater than 8 times the outer diameter of the twisted cable.

2. A flexible small pitch shielded cable according to claim 1, characterized in that: The soft copper conductor (11) is a Class 5 soft copper conductor (11).

3. The flexible small pitch shielded cable according to claim 1, characterized in that: An insulating layer (12) is disposed outside each conductor (11), the insulating layer (12) comprising a core layer (121) and an outer layer (123) disposed in sequence from the inside to the outside of the conductor (11), and the insulating layer (12) is made by multi-layer co-extrusion; The core layer (121) is used to improve the softness of the insulating layer (12), and the outer layer (123) is used to improve the softness and mechanical strength of the insulating layer (12).

4. A flexible small pitch shielded cable according to claim 3, characterized in that: An intermediate layer (122) is further provided between the core layer (121) and the outer layer (123), and the intermediate layer (122) is used to improve the flame retardancy and high temperature resistance of the insulation layer (12).

5. A flexible small pitch shielded cable according to claim 3 or 4, characterized in that: The core layer (121) is made of soft, environmentally friendly polyvinyl chloride insulating material, and the outer layer (123) is made of a thermoplastic elastomer material.

6. A flexible small pitch shielded cable according to claim 4, characterized in that: The middle layer (122) is made of a flame retardant modified polyolefin material.

7. A flexible small pitch shielded cable according to claim 3 or 4, characterized in that: Plasticizer and softener are added into the insulating layer (12).

8. The flexible small-pitch shielded cable according to claim 1, characterized in that: A filling layer (2) is provided between the cable core (1) and the shielding layer (3), and the filling layer (2) is made of non-hygroscopic PP tape.

9. The flexible small-pitch shielded cable according to claim 1, characterized in that: The shielding layer (3) is woven from soft fine copper wires drawn and annealed from high-quality oxygen-free copper, and the braiding density of the shielding layer (3) is greater than 80%.

10. The flexible small-pitch shielded cable according to claim 1, characterized in that: The outer sheath layer (4) is made of an environmentally friendly elastomeric polyvinyl chloride material.

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