A type of double-core twisted shielded cable

Abstract

This utility model belongs to the field of cable technology, specifically a double-core twisted shielded cable, comprising: a twisted pair unit, a filling layer, a composite shielding layer, an armor layer, and an outer sheath arranged sequentially from the inside out; the twisted pair unit includes a tensile strip and a pair of insulated cores, each insulated core including a conductor, an inner insulation layer, and an inner sheath; the composite shielding layer includes a first shielding layer and a second shielding layer arranged coaxially, with an elastic conductive layer filling the gap between the first and second shielding layers; this utility model provides axial tensile support to the cable through the tensile strip, enhancing its tensile, torsional, and bending resistance, while the reverse-twisted insulated cores counteract external electromagnetic interference, ensuring stable signal transmission; simultaneously, the first and second shielding layers work together to enhance the cable's electromagnetic interference resistance, and the elastic conductive layer maintains the electrical connection continuity between the first and second shielding layers while also buffering mechanical stress, improving cable durability.

Description

Technical Field

[0001] This utility model belongs to the field of cable technology, and more specifically, it relates to a double-core twisted shielded cable. Background Technology

[0002] As a core basic component for connection and power supply in electronic systems, cables are widely used in industrial control, intelligent equipment, new energy equipment and other fields. Their electromagnetic interference (EMI) resistance and signal transmission stability are directly related to the reliability of the entire system.

[0003] Currently, existing dual-core cables typically use a single-layer metal shield. Single-layer shielding has limited attenuation capability under high-frequency interference, making it difficult to effectively suppress high-frequency electromagnetic noise. Furthermore, its mechanical stability is weak. During installation, wiring, or equipment operation, the cable will be subjected to mechanical stresses such as bending and vibration, which can easily lead to micro-cracks in the shielding layer, displacement or even detachment of the overlapping parts, forming an electromagnetic leakage path. This can not only cause fluctuations in signal transmission quality but may also trigger system malfunctions.

[0004] To address the aforementioned issues, this application proposes a dual-core twisted shielded cable. Utility Model Content

[0005] The purpose of this invention is to provide a dual-core twisted shielded cable that solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is a dual-core twisted shielded cable, comprising: a twisted pair unit, a filling layer, a composite shielding layer, an armor layer, and an outer sheath arranged sequentially from the inside to the outside;

[0008] The twisted pair unit includes a tensile strip and a pair of insulated wire cores, the pair of insulated wire cores being twisted in opposite directions with a constant pitch around the outer periphery of the tensile strip;

[0009] Insulated wire core, including conductor, inner insulation layer and inner sheath;

[0010] The composite shielding layer includes a first shielding layer and a second shielding layer arranged coaxially, with a gap formed between the first shielding layer and the second shielding layer, and the gap is filled with an elastic conductive layer.

[0011] Furthermore, the elastic conductive layer is a tubular layer extending along the cable axial direction.

[0012] Furthermore, the first shielding layer is formed by circumferentially longitudinally overlapping aluminum-plastic composite strips.

[0013] Furthermore, the second shielding layer is a metal wire braided layer.

[0014] Furthermore, the filling layer is filled between the twisted pair unit and the first shielding layer.

[0015] Furthermore, the inner protective layer is made of a wear-resistant material with a smooth surface and a low coefficient of friction.

[0016] Furthermore, the outer sheath is made of TPU material.

[0017] This utility model has the following beneficial effects:

[0018] This utility model provides axial tensile support for the cable by embedding a tensile strip, avoiding the loosening of the internal structure caused by long-term stress, and enhancing the overall tensile, torsional and bending resistance of the cable. The structural design of the insulated wire cores twisted in opposite directions around the tensile strip can effectively cancel the interference of external electromagnetic fields on the two insulated wire cores, thereby improving the stability of signal transmission.

[0019] This invention enhances electromagnetic shielding capability through the synergistic effect of the first and second shielding layers. The elastic conductive layer not only maintains the electrical connection continuity between the first and second shielding layers and ensures the stability of shielding effectiveness, but also effectively buffers the direct impact of external mechanical stresses such as compression and bending on the shielding layer.

[0020] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the insulated wire core of this utility model;

[0025] The attached diagram lists the components represented by each number as follows:

[0026] In the diagram: 1. Insulated core; 101. Conductor; 102. Inner insulation layer; 103. Inner sheath; 2. Tensile strip; 3. Filler layer; 4. First shielding layer; 5. Elastic conductive layer; 6. Second shielding layer; 7. Armor layer; 8. Outer sheath; 9. Twisted pair unit; 10. Composite shielding layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Please see Figure 1 - Figure 3 As shown, this utility model is a double-core twisted shielded cable, comprising: a twisted pair unit 9, a filling layer 3, a composite shielding layer 10, an armor layer 7, and an outer sheath 8 arranged sequentially from the inside to the outside; the twisted pair unit 9 includes a tensile strip 2 and a pair of insulated cores 1, the pair of insulated cores 1 being twisted in opposite directions with a constant pitch around the tensile strip 2; the insulated core 1 includes a conductor 101, an inner insulation layer 102, and an inner sheath 103; the composite shielding layer 10 includes a first shielding layer 4 and a second shielding layer 6 arranged coaxially, with a gap formed between the first shielding layer 4 and the second shielding layer 6, and the gap being filled with an elastic conductive layer 5;

[0030] This embodiment provides a dual-core twisted shielded cable. A pair of insulated cores 1 are twisted in opposite directions to cancel external electromagnetic interference, and their twisting method is complete untwisting. The constant pitch design ensures the consistency of signal transmission. The tensile strip 2 is made of aramid fiber rope, arranged centrally along the cable axis and embedded in the center of the twisted unit to provide tensile support for the whole and avoid structural loosening caused by long-term stress. The conductor 101 is used to transmit current or signals. The inner insulation layer 102 includes the conductor 101 to achieve electrical insulation. The inner sheath 103 covers the outer periphery of the conductor 101 and plays a mechanical protection role. The elastic conductive layer 5 seamlessly fills the gap between the first shielding layer 4 and the second shielding layer 6, eliminating the possibility of interlayer electromagnetic leakage. The elastic conductive layer 5 also has an elastic buffering effect, enhancing the cable's resistance to damage.

[0031] Among them, the elastic conductive layer 5 is a tubular layer extending along the cable axis. The elastic conductive layer 5 is composed of an elastomer material mixed with conductive filler, preferably conductive rubber or conductive foam, and is wrapped between the outer peripheral surface of the first shielding layer 4 and the inner peripheral surface of the second shielding layer 6 by an extrusion process.

[0032] The first shielding layer 4 is formed by circumferential longitudinal overlapping of aluminum-plastic composite strips, with an overlap rate of 15% to 30%.

[0033] The second shielding layer 6 is a metal wire braided layer, which can be an aluminum-magnesium braided mesh or a tin-plated copper mesh.

[0034] The filling layer 3 is filled between the twisted pair unit 9 and the first shielding layer 4. The filling layer 3 is made of polypropylene rope to enhance the roundness and mechanical stability of the cable.

[0035] The inner sheath 103 is made of a wear-resistant material with a smooth surface and low coefficient of friction. It can be polytetrafluoroethylene (PTFE) or silicone rubber. The low coefficient of friction reduces the relative friction between the insulated core 1 and the inner sheath when bending, thus extending the service life of the cable.

[0036] The outer sheath 8 is made of TPU material.

[0037] Understandably, this utility model provides axial tensile support to the cable through the tensile strip 2, enhancing its tensile, torsional, and bending resistance. The reverse-twisted insulated core 1 counteracts external electromagnetic interference, ensuring stable signal transmission. At the same time, the first shielding layer 4 and the second shielding layer 6 work together to enhance the cable's electromagnetic interference resistance. The elastic conductive layer 5 can maintain the electrical connection continuity between the first shielding layer 4 and the second shielding layer 6, and also buffer mechanical stress, improving the cable's durability.

[0038] A specific application of the operation process of this embodiment is as follows: When in use, the pair of insulated wire cores 1 twisted together in opposite directions make the influence of external electromagnetic field interference on the two wire cores almost equal. In the subsequent differential signal transmission, these equal interferences can be effectively canceled by the receiving end, which improves the signal's ability to resist external electromagnetic interference (EMI) and ensures the stability and integrity of signal transmission. The tensile strip 2 is used to withstand the axial tension during installation wiring or equipment operation, and to prevent the insulated wire cores 1 from breaking or loosening due to excessive force.

[0039] The first shielding layer 4 and the second shielding layer 6 work together to effectively improve the cable's electromagnetic interference resistance. The elastic conductive layer 5 is disposed between the first shielding layer 4 and the second shielding layer 6 to maintain the continuity of the electrical connection between the first shielding layer 4 and the second shielding layer 6, and to avoid electromagnetic leakage between the shielding layers. At the same time, the elastic conductive layer 5 has a buffering capacity. When the cable is subjected to external mechanical stress such as compression or bending, it can absorb part of the impact energy through its own deformation, preventing the two shielding layers from breaking, wrinkling or failing due to excessive deformation, and extending the service life of the shielding layers.

[0040] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A dual-core twisted shielded cable, characterized in that, include: The components arranged from the inside out are: twisted pair unit (9), filling layer (3), composite shielding layer (10), armor layer (7), and outer sheath (8). The twisted unit (9) includes a tension bar (2) and a pair of insulated wire cores (1), the pair of insulated wire cores (1) being twisted in opposite directions with a constant pitch around the outer periphery of the tension bar (2); The insulated core (1) includes a conductor (101), an inner insulation layer (102), and an inner sheath (103). The composite shielding layer (10) includes a first shielding layer (4) and a second shielding layer (6) arranged coaxially, with a gap formed between the first shielding layer (4) and the second shielding layer (6), and the gap is filled with an elastic conductive layer (5).

2. The dual-core twisted shielded cable according to claim 1, characterized in that: The elastic conductive layer (5) is a tubular layer extending along the cable axis.

3. A dual-core twisted shielded cable according to claim 1, characterized in that: The first shielding layer (4) is formed by circumferential longitudinal overlapping of aluminum-plastic composite strips.

4. A dual-core twisted shielded cable according to claim 1, characterized in that: The second shielding layer (6) is a metal wire braided layer.

5. A double-core twisted shielded cable according to claim 1, characterized in that: The filling layer (3) is filled between the twisted pair unit (9) and the first shielding layer (4).

6. A dual-core twisted shielded cable according to claim 1, characterized in that: The inner protective layer (103) is made of a wear-resistant material with a smooth surface and a low coefficient of friction.

7. A double-core twisted shielded cable according to claim 1, characterized in that: The outer sheath (8) is made of TPU material.

Images