An anti-interference shielded cable for computers and instruments

Abstract

This invention relates to the field of cable technology, and more particularly to an anti-interference shielded cable for computers and instruments, comprising an insulation layer and a conductor layer disposed therein. A braided layer for shielding external magnetic fields is encircled between the insulation layer and the conductor layer. A protective structure for self-protection is encircled outside the braided layer. This invention constrains the braided layer within a stable space by respectively setting inner and outer non-woven fabrics inside and outside the braided layer, in conjunction with deformable inner and outer sheaths. Structurally, this prevents the braided layer from loosening, shifting, bulging, or turning outwards, ensuring the integrity of the shielding structure and ensuring stable signal transmission for computers and instruments. Furthermore, by utilizing the sliding fit structure of the connecting block and the sliding cavity, controllable micro-relative slippage can occur between the layers when the cable is bent or twisted, actively absorbing and releasing axial and radial stress, fundamentally solving the problem of fatigue fracture of the braided wires, and improving the cable's fatigue life and dynamic stability.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to an anti-interference shielded cable for computers and instruments. Background Technology

[0002] Computers and instruments require shielded cables for signal transmission during use. In environments with strong electromagnetic interference, these cables can ensure low distortion, low bit error rate, and stable transmission of weak analog signals, unlike ordinary power cables and ordinary communication cables.

[0003] Existing signal cables typically rely on an internal braided metal wire shielding layer for electromagnetic shielding. In traditional structures, to suppress shielding layer movement and ensure the overall roundness of the cable, the insulated core, shielding braid, and outer sheath are often tightly fitted or even semi-bonded. The allowance for relative slippage between layers is small. When the cable is frequently bent, twisted, and dragged during use, the resulting axial tensile force, radial compressive force, and interlayer shear stress are difficult to release sufficiently through relative slippage and tend to concentrate on the shielding braid. Long-term repetitive stress can cause stress fatigue in the metal wires, and even local breakage or splitting, thus affecting the stability of signal transmission and the reliability of shielding. If the interlayer gap is deliberately increased to release stress, leaving the shielding braid in a free and loose state, the stress concentration problem can be avoided. However, since the metal braid itself is a mesh-like porous structure, it lacks effective restraint. During repeated bending and twisting of the cable, the braid is prone to relative misalignment, slippage, and local loosening, resulting in uneven braid coverage and reduced shielding density, which also affects shielding performance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an anti-interference shielded cable for computers and instruments, which solves the technical problem of poor stability of the braided layer structure in existing technologies, reducing the overall shielding performance of the cable. This achieves the goal of improving the cable's fatigue life and dynamic stability, and enhancing its shielding performance.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an anti-interference shielded cable for computers and instruments, comprising an insulation layer and a conductor layer disposed therein, wherein a braided layer for shielding external magnetic fields is wrapped between the insulation layer and the conductor layer, and a protective structure for protecting itself is wrapped around the braided layer. The protective structure includes an inner sheath and an outer sheath that respectively cover the inner and outer layers of the braided layer and constrain themselves. An inner flame-retardant layer supporting the inner sheath is provided between the inner sheath and the conductor layer. An outer waterproof layer supporting the outer sheath is provided between the outer sheath and the insulation layer. The outer sheath and the inner sheath form a stress-releasing sliding fit structure with the corresponding outer waterproof layer and inner flame-retardant layer, respectively, which can be slightly displaced. The sliding fit structure includes a connecting block fixedly installed on the inner and outer sheaths to form an interlayer mating surface, and a sliding cavity opened on the sliding mating surface of the connecting block between the inner flame-retardant layer and the outer waterproof layer and the corresponding layer.

[0006] Preferably, the conductor layer has a fixing bracket inside that separates the conductors.

[0007] Preferably, the connecting blocks are evenly distributed along the entire length of the cable, and the length of the sliding cavity is greater than the length of the connecting block.

[0008] Preferably, an outer nonwoven fabric and an inner nonwoven fabric are respectively provided between the inner sheath and the outer sheath, forming a contact surface by heat fusion and being wrapped and fixed together.

[0009] Preferably, the outer nonwoven fabric and the woven layer are bonded to form a micro-convex layer, and the inner nonwoven fabric and the inner sheath are fixed by a spaced adhesive dot method with a dot spacing of 1cm.

[0010] Preferably, the outer sheath has an annular groove at its end that matches its outer diameter, and a fixing ring that is coplanar with the annular surface of the outer sheath is fitted on the annular groove.

[0011] By employing the above technical solution, the present invention provides an anti-interference shielded cable for computers and instruments, which has at least the following beneficial effects: 1. This invention constrains the braided layer within a stable space by setting inner and outer non-woven fabrics on both the inner and outer layers of the braided layer, in conjunction with deformable inner and outer sheaths. Structurally, this prevents the braided layer from becoming loose, shifting, bulging, or turning outward, ensuring the integrity of the shielding structure, stable signal transmission for computers and instruments, and long-lasting and reliable anti-interference capabilities. Furthermore, by utilizing the sliding fit structure of the connecting block and the sliding cavity, controllable micro-relative slippage can occur between the layers when the cable is bent or twisted, actively absorbing and releasing axial and radial stresses, avoiding stress concentration on the braided layer, fundamentally solving the problem of fatigue fracture of the braided filaments, and improving the cable's fatigue life and dynamic stability.

[0012] 2. This invention fixes the inner non-woven fabric and the inner sheath with a spaced adhesive dot, which ensures that the non-woven fabric is reliably positioned, does not shift, and does not wrinkle, while also preserving space for elastic deformation. This avoids the cable becoming hard due to full bonding, giving the cable both structural stability and high flexibility. Furthermore, a micro-protrusion layer is set on the inner periphery of the outer non-woven fabric to moderately increase the sliding friction with the braided layer, prevent the braided layer from slipping excessively, ensure the stability of the shielding layer, and at the same time, does not hinder normal micro-slippage to release stress, thus achieving the dual effects of shielding stability and no fiber breakage.

[0013] 3. In this invention, the braided layer is folded outward at both ends and fixed to the fixing ring by hot-melt welding with copper foil gaskets. The copper foil gaskets can improve the tightness of the connection between the braided layer and the fixing ring, reduce the contact resistance, improve the grounding stability, and effectively disperse the end stress, avoid breakage at the fold, prevent the end from fraying, loosening, or falling off, and improve the end structural strength and shielding connection reliability. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0015] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the cable cross-section structure of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the present invention; Figure 4 This is a schematic diagram showing the installation position of the protective structure of the present invention; Figure 5 This is a schematic diagram of the outer sheath structure of the present invention; Figure 6 This is a schematic diagram of the exploded structure of the outer sheath and fixing ring of the present invention; Figure 7 This is a schematic diagram of the outer nonwoven fabric structure of the present invention; Figure 8 This is a schematic diagram of the nonwoven fabric structure inside the present invention.

[0016] In the diagram: 1. Insulation layer; 2. Conductor core layer; 21. Fixing bracket; 3. Braided layer; 31. Outer non-woven fabric; 311. Micro-convex layer; 32. Inner non-woven fabric; 4. Protective structure; 41. Inner sheath; 42. Outer sheath; 421. Connecting block; 422. Sliding cavity; 43. Fixing ring; 431. Annular groove; 432. Copper foil gasket; 5. Inner flame retardant layer; 6. Outer waterproof layer. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 To address the shortcomings of existing technologies, this invention provides an anti-interference shielded cable for computers and instruments. It solves the technical problem of poor shielding layer structure stability and reduced overall cable shielding performance in existing technologies, thereby improving cable fatigue life, dynamic stability, and shielding performance. Please refer to... Figure 1 - Figure 5 The anti-interference shielded cable for computers and instruments includes an insulation layer 1 and a conductor layer 2 disposed therein. Between the insulation layer 1 and the conductor layer 2, there is a braided layer 3 that shields against external magnetic fields. The cable braided layer 3 is made of steel wire and has mesh to ensure the shielding effect of the cable. The braided layer 3 is surrounded by a protective structure 4 that protects itself. Specifically, the protective structure 4 includes an inner sheath 41 and an outer sheath 42 that respectively cover the inner and outer layers of the braided layer 3 and constrain themselves. An inner flame-retardant layer 5 supporting the inner sheath 41 is provided between the inner sheath 41 and the conductor layer 2. The inner flame-retardant layer 5 isolates the fire source from the internal signal core wire and prevents the spread of flames. The outer waterproof layer 6 resists external moisture, oil, and corrosive media, protecting the internal electrical performance. An outer waterproof layer 6 supporting the outer sheath 42 is provided between the outer sheath 42 and the insulation layer 1. The outer sheath 42 and the inner sheath 41 are respectively connected to the corresponding outer waterproof layer 6 and inner sheath 42. The flame-retardant layer 5 forms a stress-releasing sliding fit structure with slight relative displacement between its layers; the cable core layer is composed of a braided layer 3, which, together with the inner non-woven fabric 32 and the outer non-woven fabric 31, forms a dense electromagnetic enclosure space. When there is strong electromagnetic interference from the outside, the braided layer 3, as a low-impedance conductive circuit, will induce eddy currents and reverse magnetic fields to cancel and absorb the energy of external interference. At the same time, the inner non-woven fabric 32 and the outer non-woven fabric 31 assist the braided layer 3 in forming a continuous shielding boundary to prevent interference from penetrating through the braided mesh and ensure the integrity of the internal computer and instrument signals.

[0019] Furthermore, such as Figures 3-5 As shown, the sliding fit structure includes a connecting block 421 fixedly installed on the inner sheath 41 and the outer sheath 42 to form an interlayer mating surface, and a sliding cavity 422 opened between the inner flame-retardant layer 5 and the outer waterproof layer 6 and the corresponding layer of the connecting block 421. The connecting block 421 and the sliding cavity 422 are slidably fitted, and the length of the sliding cavity 422 is greater than the length of the connecting block 421. The sliding fit of the connecting block 421 in the sliding cavity 422 allows the stress of the cable to be actively released under repeated bending and torsion dynamic conditions, and will not be transmitted to the braided layer 3. This fundamentally solves the problem that traditional rigid shielded cables are prone to braided layer 3 breakage and shielding failure due to fatigue.

[0020] Because the cable braided layer 3 is made of steel wire and has a mesh, when the cable is repeatedly bent and twisted, the steel wires in the braided layer 3 are prone to breakage, which affects the shielding performance of the braided layer 3. In order to ensure constant shielding effectiveness, such as Figure 3 - Figure 6 As shown, several connecting blocks 421 are spaced apart on the outer periphery of the outer sheath 42 and the inner periphery of the inner sheath 41. The connecting blocks 421 are slidably connected to the corresponding layers. The cable is designed with a cooperative structure of sliding connecting blocks 421 and sliding cavity 422. When the cable undergoes dynamic bending and torsion, a small relative displacement is allowed between the inner sheath 41 and the inner flame-retardant layer 5, and between the outer sheath 42 and the outer waterproof layer 6. The connecting blocks 421 slide within the length range of the sliding cavity 422, actively absorbing and releasing the axial and radial stress generated by the cable bending, avoiding stress concentration and transmission to the braided layer 3, preventing the copper wires from breaking due to fatigue, and thus protecting the braided layer 3. This solves the problem that traditional rigid shielded cables are prone to shielding failure due to fatigue-induced breakage of the braided layer 3.

[0021] To prevent the conductors inside the cable from squeezing against each other, such as Figure 4 As shown, a fixing bracket 21 is fixed inside the conductor layer 2 to separate several conductor cores. By separating several conductor core layers 2 with the fixing bracket 21, the compression between conductor core layers 2 can be avoided, which could cause damage.

[0022] Specifically, because traditional cables are rigidly bonded or fully adhesively fixed between layers, there is no relative sliding space between the layers during bonding. The axial tensile force, radial compressive force, and shear stress generated when the cable bends or twists cannot be released and are all concentrated on the braided layer 3 metal wires. This causes the braided wires to be in a state of high stress fatigue for a long time, leading to localized fatigue, brittle fracture, and damage. The conductive continuity of the shielding layer is disrupted, and the shielding effectiveness is significantly reduced. To solve these problems, such as... Figure 2 - Figure 6 As shown, the connecting block 421 is evenly distributed along the entire length of the cable, and the length of the sliding cavity 422 is greater than the length of the connecting block 421. The contact end face of the connecting block 421 and the sliding cavity 422 is arc-shaped, and the shape of the connecting block 421 matches the shape of the sliding cavity 422. The arc-shaped contact surface can increase the contact area, disperse stress, and reduce the frictional resistance during sliding, ensuring that the braided layer 3 slides smoothly without jamming or local stress.

[0023] Example 2 Because the existing braided layer 3 lacks reinforcing structures at both ends, relying solely on simple binding or crimping, it easily unravels under stress, resulting in a small contact area, high and unstable contact resistance. This leads to an unreliable shielding layer, ineffective interference discharge, and failure of the overall cable shielding function, easily causing equipment malfunctions, data anomalies, and electromagnetic compatibility issues. To address these problems, based on Example 1, as follows... Figure 1 - Figure 5 As shown, an annular groove 431 adapted to the outer diameter of the outer sheath 42 is formed at its end. A fixing ring 43, coplanar with the annular surface of the outer sheath 42, is fitted onto the annular groove 431. The inner diameter of the fixing ring 43 is larger than the diameter of the port of the outer sheath 42. The advantage of this design is that when the fixing ring 43 and the annular surface of the outer sheath 42 are coplanar, an annular cavity is formed between the fixing ring 43 and the outer sheath 42. This annular cavity is used for the installation of the copper foil gasket 432 and the braided layer 3, and the fixing ring 43 can be used for locking and limiting, which can effectively prevent the braided layer 3 from loosening and slipping, improve the overall structure and connection reliability. The loose end of the braided layer 3 is folded outward and covered by the end of the outer sheath 42. The fixing ring 43 is located at both ends of the outer sheath 42, which can wrap the extended ends of the cable braided layer 3 and cover the outer sheath. A copper foil gasket 432 is attached and fixed to the braided layer 3 and the fixing ring 43 at the end of the sleeve 42 by hot-melt bonding. The copper foil gasket 432, the braided layer 3, and the fixing ring 43 are all fixed with hot melt adhesive, which makes the connection between the braided layer 3 and the fixing ring 43 tighter and the contact resistance lower. This not only prevents the end from fraying, but also improves the grounding stability. At the same time, it disperses the end stress and avoids breakage at the fold. The fixing ring 43 is fitted in the annular groove 431, and the outer circumference of the fixing ring 43 is coplanar with the outer circumference of the outer sheath 42. The two ends of the braided layer 3 are folded and coplanarly combined with the fixing ring 43 with a matching diameter, which creates a high-strength end structure. This makes the braided layer 3 evenly stressed when subjected to tension and vibration, preventing end fraying, loosening, or poor contact, and ensuring low impedance and long-term stability of the shielded grounding.

[0024] To improve the fatigue life of braided layer 3, such as Figure 4 - Figure 5 As shown, both the outer sheath 42 and the inner sheath 41 are made of deformable material. The braided layer 3 is constrained between the outer sheath 42 and the inner sheath 41. The inner and outer sheaths 42 are made of deformable material, which forms a flexible wrapping support for the internal components. At the same time, the fixing rings 43 at both ends and the folded braided layer 3 form a rigid overall structure, which restricts the excessive stretching of the braided layer 3 in the axial direction and the outward folding in the radial direction. This forms a combination of fixed constraint and micro-slip buffer, which not only ensures the overall structural roundness of the cable, but also ensures its high flexibility, making it suitable for complex installation and use environments.

[0025] While ensuring the structural stability of the cable braided layer 3, the overall dynamic flexibility of the cable is improved, such as... Figure 6 - Figure 8 As shown, an outer nonwoven fabric 31 and an inner nonwoven fabric 32 are respectively provided between the inner sheath 41 and the outer sheath 42, forming a contact surface through heat fusion and being circumferentially attached and fixed. The nonwoven fabric layer acts as an isolation pad, isolating the metal braided layer 3 from direct friction with the sheath, while absorbing minor vibrations. The matching design of the connecting block 421 and the sliding cavity 422 ensures the coaxiality and roundness between the layers, avoids eccentricity, and ensures the electrical consistency of computer and instrument signal transmission. The outer nonwoven fabric 31 and the braided layer 3 form a micro-convex layer 311 when they are in contact. The inner nonwoven fabric 32 and the inner sheath 41 are fixed by a spaced adhesive dot method, with an adhesive dot spacing of 1. The micro-convex texture of the inner micro-convex layer 311 of the outer nonwoven fabric 31 moderately increases the friction with the braided layer 3, preventing the braided layer 3 from slipping excessively within the sheath and ensuring the stability of the shielding position. At the same time, it does not hinder normal micro-displacement, achieving a balance between shielding stability and non-fraying. The inner nonwoven fabric 32 and the inner sheath 41 are fixed by a spaced dotting method with a dot spacing of 1cm. The spaced ring dotting design not only firmly fixes the nonwoven fabric to the sheath, preventing it from shifting or wrinkling under dynamic conditions, but also retains sufficient elastic space through non-full-width bonding, providing a channel for the micro-slippage of the braided layer 3 and preventing the cable from hardening.

[0026] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-interference shielded cable for computers and instruments, comprising an insulation layer (1) and a conductor layer (2) disposed therein, characterized in that: Between the insulating layer (1) and the conductor layer (2), there is a braided layer (3) that shields the external magnetic field, and the braided layer (3) is surrounded by a protective structure (4) that protects itself. The protective structure (4) includes an inner sheath (41) and an outer sheath (42) that respectively cover the inner and outer layers of the braided layer (3) and constrain themselves. An inner flame-retardant layer (5) supporting the inner sheath (41) is provided between the inner sheath (41) and the conductor layer (2). An outer waterproof layer (6) supporting the outer sheath (42) is provided between the outer sheath (42) and the insulation layer (1). The outer sheath (42) and the inner sheath (41) respectively form a stress-releasing sliding fit structure with the corresponding outer waterproof layer (6) and inner flame-retardant layer (5) that can be slightly displaced. The sliding fit structure includes a connecting block (421) fixedly installed on the inner sheath (41) and the outer sheath (42) to form an interlayer mating surface, and a sliding cavity (422) opened on the sliding mating surface of the connecting block (421) between the inner flame retardant layer (5) and the outer waterproof layer (6) and the corresponding layer.

2. The anti-interference shielded cable for computers and instruments according to claim 1, characterized in that: The conductor layer (2) is internally fixed with a fixing bracket (21) that separates several conductors.

3. The anti-interference shielded cable for computers and instruments according to claim 1, characterized in that: The connecting blocks (421) are evenly distributed along the entire length of the cable, and the length of the sliding cavity (422) is greater than the length of the connecting blocks (421).

4. The anti-interference shielded cable for computers and instruments according to claim 1, characterized in that: The inner sheath (41) and the outer sheath (42) are respectively provided with an outer nonwoven fabric (31) and an inner nonwoven fabric (32) that form a contact surface by heat fusion and are wrapped and fixed.

5. The anti-interference shielded cable for computers and instruments according to claim 4, characterized in that: The outer nonwoven fabric (31) and the braided layer (3) are bonded to form a micro-convex layer (311), and the inner nonwoven fabric (32) and the inner sheath (41) are fixed by a spacing adhesive dotting method with an adhesive dot spacing of 1cm.

6. The anti-interference shielded cable for computers and instruments according to claim 1, characterized in that: The outer sheath (42) has an annular groove (431) at its end that is adapted to its outer diameter, and a fixing ring (43) is fitted on the annular groove (431) and is coplanar with the annular surface of the outer sheath (42).

7. The anti-interference shielded cable for computers and instruments according to claim 1, characterized in that: The loose end of the braided layer (3) is folded outward and wrapped around the end of the outer sheath (42). The braided layer (3) wrapped around the end of the outer sheath (42) and the fixing ring (43) are wrapped together by heat fusion and fixed into a copper foil gasket (432).

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