Anti-twisting and anti-loosening anti-interference audio cable

Abstract

The utility model discloses an anti-twisting loosening type anti-interference audio cable which comprises two insulating wire cores and two nylon fiber filling cores which are symmetrically arranged in a cross shape and are jointly twisted to form a cable core, and the cable core is sequentially coated with a PTFE semi-directional belt wrapping antifriction layer, an aluminum foil shielding layer and an irradiation crosslinking high-density polyethylene outer sheath layer. A tinned oxygen-free copper bar streamline is arranged between the antifriction layer and the shielding layer, the insulating wire core comprises a tinned oxygen-free copper conductor and an irradiation crosslinking low-density polyethylene insulating layer, the insulating wire core is back-twisted and twisted, the twisting pitch is 8-15 times of the outer diameter, the twisting direction of the insulating wire core is opposite to the twisting direction of the cable core, the sectional area of the insulating wire core is 0.2 mm2 to 1.5 mm2, and the outer diameter of the outer sheath layer does not exceed 9mm. According to the cable, the cable core structure is balanced, the double cores are twisted tightly and are not easy to loosen, the influence of interference generated between the double-core wire pairs is reduced, the external electromagnetic wave interference resistance is enhanced, and the stable signal transmission characteristic is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to an anti-twisting and loosening type anti-interference audio cable. Background Art

[0002] The audio cable is composed of an audio cable and a connector. The audio cable is generally a two-core shielded cable, and the connector is mostly an RCA connector, an XLR connector, or a TRS connector. The audio signals transmitted between audio devices are roughly divided into two categories, balanced signals and unbalanced signals. If the original signal is inverted, and then the inverted signal and the original signal are transmitted at the same time, it is called a balanced signal. The principle is to minimize other interference during the transmission of the audio signal. The original signal and the anti-phase signal are subtracted to obtain the enhanced original signal. Since the interference received by the two lines during transmission is almost the same, the interference signal is subtracted during the subtraction process, making the anti-interference ability stronger. The audio cable is made of two cores twisted together. This twisting method can allow the inductance and capacitance to offset each other, reduce the influence of interference between the line pairs themselves, and can also be used to resist some external electromagnetic interference and maintain stable signal transmission. However, general audio cables use a double-core twisting method without back-twisting, and the pitch-to-diameter ratio used during twisting is unreasonable. For example, the pitch-to-diameter ratio is too large, the twisting is not tight enough, and it is easy to get loose during use. It cannot effectively reduce the interference between the line pairs itself, greatly weakens the anti-interference ability, the electrical characteristics are unstable, and the signal transmission quality is poor. Utility Model Content

[0003] The present application aims to provide an anti-twisting and loosening type anti-interference audio cable in view of the deficiencies in the prior art. The cable core structure is balanced and the structural strength is better. By optimizing the double-core twisting to detwisting twisting and adopting a reasonable pitch-diameter ratio, the double-core twisting is tight and not easy to loosen, which is beneficial to reducing the influence of interference between the double-core wire pairs, enhancing the ability to resist external electromagnetic wave interference, ensuring stable signal transmission characteristics, and improving durability.

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

[0005] The anti-twisting loosening type anti-interference audio cable comprises two insulating cores and two nylon fiber-filled cores which are symmetrically arranged in a cross shape and twisted together to form a cable core. The outer diameter of the nylon fiber-filled core is 95% to 105% of the outer diameter of the insulating core. The outer part of the cable core is sequentially coated with a PTFE semi-directional tape wrapped anti-friction layer, an aluminum foil shielding layer and an irradiated cross-linked high-density polyethylene outer sheath layer. A tinned oxygen-free copper drain wire is arranged between the PTFE semi-directional tape wrapped anti-friction layer and the aluminum foil shielding layer. The insulating core comprises a tinned oxygen-free copper conductor and an irradiated cross-linked low-density polyethylene insulation layer. The insulating core is back-twisted and the lay pitch is 8 to 15 times the outer diameter. The twist direction of the insulating core itself is opposite to the twist direction of the cable core. The cross-sectional area of ​​the insulating core is 0.2mm 2 Up to 1.5mm 2 The outer diameter of the radiation cross-linked high-density polyethylene outer sheath layer does not exceed 9 mm.

[0006] Preferably, the cross-sectional area of ​​the insulating core is 0.32 mm 2 , 0.52mm 2 、0.81mm 2 and 1.32mm 2 .

[0007] Preferably, the tinned oxygen-free copper conductor is composed of a plurality of tinned oxygen-free copper monofilaments with a wire diameter of 0.02 mm to 0.04 mm, and the twisting direction of the tinned oxygen-free copper monofilaments is opposite to that of the cable core.

[0008] Preferably, the lay length of the tinned oxygen-free copper conductor is 4 to 10 times the outer diameter of the tinned oxygen-free copper conductor.

[0009] Preferably, the PTFE semi-directional tape wrapped anti-friction layer is a multi-layer PTFE semi-directional tape overlapping wrapped structure with a thickness of 0.02 to 0.1 mm.

[0010] Preferably, the winding direction of the PTFE semi-directional tape is opposite to the twisting direction of the cable core.

[0011] Preferably, the tinned oxygen-free copper drain wire is formed by twisting a plurality of tinned oxygen-free copper wires with a wire diameter of 0.02 mm to 0.08 mm.

[0012] Preferably, the aluminum foil shielding layer is an aluminum foil tape spirally overlapped and wrapped structure.

[0013] Preferably, the aluminum foil tape is formed by compounding a PET film layer and an aluminum foil layer.

[0014] Preferably, the thickness of the PET film layer is 20 μm to 50 μm, and the thickness of the aluminum foil layer is 3 μm to 15 μm.

[0015] Beneficial effects of this application:

[0016] 1. By adding two nylon fiber filling cores and two insulating cores to form a cross-shaped arrangement, it is beneficial to ensure that the cable core cross-section is round, the structural strength is better, the structure is balanced and stable, the lateral pressure on the insulating core is reduced, the conductor breakage is suppressed, the stability of signal transmission is ensured, and the electrical characteristics of the cable are improved.

[0017] 2. By optimizing the twisting of the two insulated cores into back-twisted twisting, combined with the cross-sectional area of ​​the insulated core itself of 0.2mm 2 Up to 1.5mm 2 , adopt a reasonable pitch-to-diameter ratio, that is, the insulated core lay pitch is 8 to 15 times the outer diameter. During the cable core twisting process, the insulated core itself twists and the twisting direction is opposite to the cable core twisting direction. While the insulated core is tightly twisted, it is beneficial to suppress the occurrence of looseness, which is beneficial to reduce the influence of interference between the two insulated cores, enhance the ability to resist external electromagnetic wave interference, ensure stable signal transmission characteristics, and improve durability.

[0018] 3. The cable core is coated with a PTFE semi-directional tape anti-friction layer on the outside. The tight wrapping has low friction and is not easy to wrinkle. It helps to maintain a uniform distance between the conductor and the aluminum foil shielding layer, ensuring the stability of electrical properties and better durability. 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-insulated wire core, 2-nylon fiber filled core, 3-PTFE semi-directional tape wrapped anti-friction layer, 4-aluminum foil shielding layer, 5-irradiation cross-linked high-density polyethylene outer sheath layer, 6-tinned oxygen-free copper drain wire, 7-tinned oxygen-free copper conductor, 8-irradiation cross-linked low-density polyethylene insulation layer. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1 The anti-twisting loosening type anti-interference audio cable of the embodiment of the present application comprises two insulating cores 1 and two nylon fiber filling cores 2 arranged symmetrically in a cross shape and twisted together to form a cable core, and the outer diameter of the nylon fiber filling core 2 is 95% to 105% of the outer diameter of the insulating core 1. The cross-sectional area of ​​the insulating core 1 is 0.2mm 2 Up to 1.5mm 2 Furthermore, the cross-sectional area of ​​the insulating core 1 is 0.32 mm 2 , 0.52mm2 、0.81mm 2 and 1.32mm 2 The insulated wire core 1 comprises a tinned oxygen-free copper conductor 7 and an irradiated cross-linked low-density polyethylene insulation layer 8. Specifically, the tinned oxygen-free copper conductor 7 is composed of a plurality of tinned oxygen-free copper monofilaments with a wire diameter of 0.02 mm to 0.04 mm, and the twist direction of the tinned oxygen-free copper monofilaments is opposite to that of the cable core. Furthermore, the lay length of the tinned oxygen-free copper conductor 7 is 4 to 10 times the outer diameter of the tinned oxygen-free copper conductor 7. The insulated wire core 1 is back-twisted and the lay length is 8 to 15 times the outer diameter. The twist direction of the insulated wire core 1 itself is opposite to that of the cable core.

[0024] The cable core is coated with a PTFE semi-directional tape wrapped anti-friction layer 3, an aluminum foil shielding layer 4 and an irradiated cross-linked high-density polyethylene outer sheath layer 5 in sequence on the outside. A tinned oxygen-free copper drain wire 6 is provided between the PTFE semi-directional tape wrapped anti-friction layer 3 and the aluminum foil shielding layer 4. Further, the tinned oxygen-free copper drain wire 6 is composed of a plurality of tinned oxygen-free copper wires with a wire diameter of 0.02 mm to 0.08 mm twisted together. In one embodiment, the PTFE semi-directional tape wrapped anti-friction layer 3 is a multi-layer PTFE semi-directional tape overlapping wrapped structure with a thickness of 0.02 to 0.1 mm. Further, the winding direction of the PTFE semi-directional tape is opposite to the twisting direction of the cable core. In one embodiment, the aluminum foil shielding layer 4 is an aluminum foil tape spirally overlapped wrapped structure. Further, the aluminum foil tape is formed by a composite of a PET film layer and an aluminum foil layer, the PET film layer has a thickness of 20 μm to 50 μm, and the aluminum foil layer has a thickness of 3 μm to 15 μm. The outer diameter of the radiation cross-linked high-density polyethylene outer sheath layer 5 does not exceed 9 mm.

[0025] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. Anti-twisting loosening type anti-interference audio cable, its characteristics are: The invention comprises two insulating wire cores (1) and two nylon fiber-filled cores (2) which are symmetrically arranged in a cross shape and twisted together to form a cable core. The outer diameter of the nylon fiber-filled core (2) is 95% to 105% of the outer diameter of the insulating wire core (1). The outer part of the cable core is sequentially coated with a PTFE semi-directional tape wrapped anti-friction layer (3), an aluminum foil shielding layer (4) and an irradiated cross-linked high-density polyethylene outer sheath layer (5). A tinned oxygen-free copper drain wire (6) is provided between the PTFE semi-directional tape wrapped anti-friction layer (3) and the aluminum foil shielding layer (4). The insulating wire core (1) comprises a tinned oxygen-free copper conductor (7) and an irradiated cross-linked low-density polyethylene insulation layer (8). The insulating wire core (1) is twisted and the lay length is 8 to 15 times the outer diameter. The twist direction of the insulating wire core (1) itself is opposite to the twist direction of the cable core. The cross-sectional area of ​​the insulating wire core (1) is 0.2 mm 2 Up to 1.5mm 2 The outer diameter of the radiation cross-linked high-density polyethylene outer sheath layer (5) does not exceed 9 mm.

2. The anti-twisting loosening type anti-interference audio cable according to claim 1 is characterized in that: The cross-sectional area of ​​the insulating core (1) is 0.32 mm 2 , 0.52mm 2 、0.81mm 2 and 1.32mm 2 .

3. The anti-twisting loosening type anti-interference audio cable according to claim 1 is characterized in that: The tinned oxygen-free copper conductor (7) is composed of a plurality of tinned oxygen-free copper single wires with a wire diameter of 0.02 mm to 0.04 mm, and the twisting direction of the tinned oxygen-free copper single wires is opposite to that of the cable core.

4. The anti-twisting loosening type anti-interference audio cable according to claim 3 is characterized in that: The lay length of the tinned oxygen-free copper conductor (7) is 4 to 10 times the outer diameter of the tinned oxygen-free copper conductor (7).

5. The anti-twisting loosening type anti-interference audio cable according to claim 1 is characterized in that: The PTFE semi-directional tape wrapped anti-friction layer (3) is a multi-layer PTFE semi-directional tape overlapping wrapped structure and has a thickness of 0.02 to 0.1 mm.

6. The anti-twisting loosening type anti-interference audio cable according to claim 5 is characterized in that: The winding direction of the PTFE semi-directional tape is opposite to the twisting direction of the cable core.

7. The anti-twisting loosening type anti-interference audio cable according to claim 1 is characterized in that: The tinned oxygen-free copper drain wire (6) is composed of a plurality of tinned oxygen-free copper wires with a wire diameter of 0.02 mm to 0.08 mm twisted together.

8. The anti-twisting loosening type anti-interference audio cable according to claim 1 is characterized in that: The aluminum foil shielding layer (4) is a spirally overlapped and wrapped structure of aluminum foil strips.

9. The anti-twisting loosening type anti-interference audio cable according to claim 8 is characterized in that: The aluminum foil tape is formed by compounding a PET film layer and an aluminum foil layer.

10. The anti-twisting loosening type anti-interference audio cable according to claim 9, characterized in that: The thickness of the PET film layer is 20 μm to 50 μm, and the thickness of the aluminum foil layer is 3 μm to 15 μm.

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