A multi-tiered shielded signal cable

Abstract

The utility model discloses a multilayer level anti -shielding signal cable, including transmission mechanism, shielding mechanism and protection mechanism, transmission mechanism includes signal cable and insulating layer, and insulating layer is located signal cable outside, shielding mechanism includes high -frequency shielding layer, low -frequency shielding layer and pulse shielding layer, and low -frequency shielding layer is located high -frequency shielding layer's outside, and pulse shielding layer is located low -frequency shielding layer's outside, and high -frequency shielding layer is used for shielding high -frequency radiation, and low -frequency shielding layer is used for shielding low -frequency radiation, and pulse shielding layer is used for shielding pulse radiation, protection mechanism is located pulse shielding layer outside, and protection mechanism is used for protecting transmission mechanism and shielding mechanism, and the utility model discloses beneficial effect is: special shielding layer is set respectively to three kinds of interference of high frequency, low frequency, pulse, breaks through the performance limitation of traditional cable single shielding layer, realizes the efficient resistance of full -band electromagnetic interference, satisfies industrial control, medical equipment etc. High -precision scene demand.

Description

Technical Field

[0001] This utility model relates to the field of cables, specifically to a multi-layer anti-shielding signal cable. Background Technology

[0002] Signal cables, as the core carrier of data transmission, are widely used in critical fields such as industrial control, aerospace, medical equipment, and communications. Their transmission stability directly determines the accuracy and reliability of system operation. With the increasing integration of electronic devices and the upgrading of transmission rates, signal cables face increasingly severe electromagnetic interference and radio frequency interference.

[0003] Chinese utility model patent CN219040136U discloses a multi-layer anti-shielding signal cable, comprising a cable body, a set of conductive cables arranged at the center of the cable body, several sets of signal cables arranged around the outside of the conductive cables, positioning cables arranged between adjacent signal cables, a shielding protective layer arranged on the outside of the cable body corresponding to the signal cables and positioning cables, a gap reserved between the signal cables and the conductive cables, the gap being filled with a primary filling layer, and a protective layer wrapped around the outside of the primary filling layer, the outer wall of the protective layer abutting against the outer wall of the signal cables and positioning cables.

[0004] The aforementioned technologies have the following drawbacks: electromagnetic interference mainly includes high-frequency radiation, low-frequency radiation, and pulse interference. The signal cables mentioned above only have a single shielding layer, which has limited shielding effect and low signal stability. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a multi-level anti-shielding signal cable to solve the technical problem that the shielding protection layer in the prior art has a single function and can only shield a single signal interference.

[0006] To achieve the above technical objectives, the present invention provides a multi-layer anti-shielding signal cable, including a transmission mechanism, wherein the transmission mechanism includes a signal cable and an insulation layer, and the insulation layer is disposed on the outside of the signal cable; A shielding mechanism comprising a high-frequency shielding layer, a low-frequency shielding layer, and a pulse shielding layer, wherein the low-frequency shielding layer is disposed outside the high-frequency shielding layer, the pulse shielding layer is disposed outside the low-frequency shielding layer, the high-frequency shielding layer is used to shield high-frequency radiation, the low-frequency shielding layer is used to shield low-frequency radiation, and the pulse shielding layer is used to shield pulse radiation; and, A protective mechanism is located outside the pulse shielding layer and is used to protect the transmission mechanism and the shielding mechanism.

[0007] In some embodiments, the high-frequency shielding layer includes an aluminized polyester film, which is spirally wound around the outside of the insulating layer.

[0008] In some embodiments, the high-frequency shielding layer further includes a nano-carbon coating, which is attached to the side of the aluminized polyester film near the low-frequency shielding layer.

[0009] In some embodiments, a pressure-sensitive adhesive layer is applied to the middle part of the high-frequency shielding layer near the insulating layer, and a cured adhesive layer is applied to both ends of the high-frequency shielding layer near the insulating layer.

[0010] In some embodiments, the low-frequency shielding layer includes a tinned copper wire braided mesh, which is spirally wound around the outside of an aluminized polyester film.

[0011] In some embodiments, the pulse shielding layer includes a conductive rubber layer, a copper foil, and conductive particles. The copper foil is disposed on both sides of the conductive rubber layer, the conductive particles are disposed inside the conductive rubber layer, and the conductive rubber layer is spirally wound around the outside of a tin-plated copper wire braided mesh.

[0012] In some embodiments, the protective mechanism includes a protective sleeve and a buffer layer, wherein the buffer layer is disposed outside the pulse shielding layer and the protective sleeve is disposed outside the buffer layer.

[0013] In some embodiments, the shielding mechanism further includes a grounding terminal, a busbar, and a shielding ring. One end of the grounding terminal is connected to the high-frequency shielding layer, the other end of the grounding terminal is connected to the busbar, and the shielding ring is connected to the outside of the grounding terminal.

[0014] Compared with the prior art, the beneficial effects of this utility model include: setting up dedicated shielding layers for high-frequency, low-frequency and pulse interference, breaking through the performance limitations of the single shielding layer of traditional cables, achieving efficient resistance to electromagnetic interference across the entire frequency band, and meeting the needs of high-precision scenarios such as industrial control and medical equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the signal cable provided by this utility model; Figure 2 This is a schematic diagram of the overall structure of the high-frequency shielding layer provided by this utility model; Figure 3 This is a schematic diagram of the overall structure of the pulse shielding layer provided by this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Transmission mechanism; 11. Signal cable; 12. Insulation layer; 21. High-frequency shielding layer; 211. Aluminized polyester film; 212. Pressure-sensitive adhesive layer; 213. Curing adhesive layer; 22. Low-frequency shielding layer; 221. Tinned copper wire braided mesh; 23. Pulse shielding layer; 231. Conductive rubber layer; 232. Copper foil; 233. Conductive particles; 24. Grounding terminal; 25. Busbar; 26. Shielding ring; 3. Protective mechanism; 31. Protective sleeve; 32. Buffer layer. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] This utility model provides a multi-layer anti-shielding signal cable, the structure of which is as follows: Figure 1 - Figure 3 As shown, it includes a transmission mechanism 1, a shielding mechanism, and a protection mechanism 3.

[0019] The transmission mechanism 1 includes a signal cable 11 and an insulation layer 12, with the insulation layer 12 located on the outside of the signal cable 11.

[0020] The shielding mechanism includes a high-frequency shielding layer 21, a low-frequency shielding layer 22, and a pulse shielding layer 23. The low-frequency shielding layer 22 is disposed outside the high-frequency shielding layer 21, and the pulse shielding layer 23 is disposed outside the low-frequency shielding layer 22. The high-frequency shielding layer 21 is used to shield high-frequency radiation, the low-frequency shielding layer 22 is used to shield low-frequency radiation, and the pulse shielding layer 23 is used to shield pulse radiation.

[0021] The protective mechanism 3 is located outside the pulse shielding layer 23, and the protective mechanism 3 is used to protect the transmission mechanism 1 and the shielding mechanism.

[0022] In use, the signal cable 11 serves as the core conductor for transmitting electrical signals. Its outer insulating layer 12, with its high insulation properties, blocks signal leakage to the outside and prevents external interference from directly penetrating the conductor, providing basic isolation for the shielding mechanism. The high-frequency shielding layer 21 forms an electromagnetic barrier through a continuous conductive layer, preventing high-frequency energy penetration. The low-frequency shielding layer 22 guides remaining low-frequency interference into the grounding system through a low-impedance path. The pulse shielding layer 23 absorbs transient pulse energy using damping characteristics and diverts pulse interference to the grounding terminal. The protective mechanism 3, wrapped around the outermost shielding layer, absorbs external stress through mechanical buffering, preventing the shielding layer from deteriorating due to physical damage, and simultaneously isolating the shielding layer from environmental factors such as moisture and dust.

[0023] In this invention, dedicated shielding layers are set up for three types of interference: high frequency, low frequency, and pulse. This breaks through the performance limitations of the single shielding layer of traditional cables, and achieves efficient resistance to electromagnetic interference across the entire frequency band, meeting the needs of high-precision scenarios such as industrial control and medical equipment.

[0024] To shield against high-frequency radiation, please refer to Figure 1 In a preferred embodiment, the high-frequency shielding layer 21 includes an aluminized polyester film 211, which is spirally wound around the outside of the insulating layer 12.

[0025] When in use, the aluminum layer of the aluminized polyester film 211 has high conductivity, forming a strong reflective barrier against high-frequency radiation of 100MHz-6GHz. Combined with the continuity of the spiral winding, it prevents high-frequency signals from diffracting and intruding through the gaps.

[0026] To reduce the possibility of secondary radiation, please refer to Figure 1 In a preferred embodiment, the high-frequency shielding layer 21 further includes a nano-carbon coating, which is attached to the side of the aluminized polyester film 211 near the low-frequency shielding layer 22.

[0027] In use, the nano-carbon coating can reduce the impedance mismatch between the aluminum-plated film 211 and the low-frequency shielding layer 22, reduce the signal coupling caused by electromagnetic induction in the two shielding structures, and prevent interference signals from being reflected and superimposed between the layers to form secondary radiation.

[0028] To further improve the resistance to shedding of the high-frequency shielding layer 21, please refer to... Figure 2 In a preferred embodiment, the high-frequency shielding layer 21 is coated with a pressure-sensitive adhesive layer 212 at the middle part of the side of the high-frequency shielding layer 21 near the insulating layer 12, and the two ends of the high-frequency shielding layer 21 near the insulating layer 12 are coated with a cured adhesive layer 213.

[0029] When in use, the immediate initial tack of the pressure-sensitive adhesive layer 212 can quickly position the high-frequency shielding layer 21 during assembly, ensuring no misalignment during the bonding process, and providing a foundation for the precise coating and curing of the subsequent cured adhesive layer 213; while the long-lasting strong tack of the cured adhesive layer 213 provides core adhesion during long-term use. The combination of the two improves the overall peel strength between the high-frequency shielding layer 21 and the insulating layer 12.

[0030] To shield against low-frequency radiation, please refer to Figure 1 In a preferred embodiment, the low-frequency shielding layer 22 includes a tin-plated copper wire braided mesh 221, which is spirally wound around the outside of the aluminized polyester film 211.

[0031] When in use, the tin-plated copper wire braided mesh 221 has high conductivity and a braiding density of over 95%, forming a low-impedance path for low-frequency electromagnetic radiation of 10kHz-100MHz. The braided mesh is in close contact with the aluminum layer of the inner high-frequency shielding layer 21, which can quickly guide residual interference that is not completely blocked by the high-frequency shielding layer 21 into the grounding system through the braided mesh, forming a synergistic shielding effect of high-frequency reflection and low-frequency conduction.

[0032] To shield against pulsed radiation, please refer to Figure 3 In a preferred embodiment, the pulse shielding layer 23 includes a conductive rubber layer 231, a copper foil 232, and conductive particles 233. The copper foil 232 is disposed on both sides of the conductive rubber layer 231, and the conductive particles 233 are disposed inside the conductive rubber layer 231. The conductive rubber layer 231 is spirally wound around the outside of the tin-plated copper wire braided mesh 221 at a 45-degree angle, and the overlap area between each turn of the conductive rubber layer 231 and the previous turn of the conductive rubber layer 231 is greater than 50%.

[0033] During use, the uniformly distributed silver-nickel alloy conductive particles 233 within the conductive rubber layer 231 form a three-dimensional conductive network, which can quickly absorb the high-frequency energy generated by the transient pulse and dissipate the pulse energy into a small amount of heat energy through the contact resistance between the particles. The copper foils 232 on both sides serve as highly conductive layers, which can quickly conduct the unabsorbed residual pulse current to the grounding system, forming a low-impedance path with the inner tin-plated copper wire braided mesh 221.

[0034] To protect transmission mechanism 1 and shielding mechanism, please refer to... Figure 1 In a preferred embodiment, the protective mechanism 3 includes a protective sleeve 31 and a buffer layer 32, wherein the buffer layer 32 is disposed outside the pulse shielding layer 23 and the protective sleeve 31 is disposed outside the buffer layer 32.

[0035] During use, the buffer layer 32 is made of polyolefin elastomer, which has excellent elastic deformation capability. When the cable is subjected to external impacts such as installation compression or falling objects from height, the buffer layer 32 absorbs the impact energy through compression deformation, reducing the impact force on the inner shielding mechanism and preventing the aluminum layer of the aluminized polyester film 211 from breaking and the tinned copper wire braided mesh 221 from deforming. The protective sleeve 31 is made of flame-retardant polyether polyurethane with a diamond-shaped wear-resistant texture on the surface. It can resist ground friction and pipe scratches during the laying process.

[0036] To reduce power frequency noise and high-frequency interference, please refer to... Figure 1 In a preferred embodiment, the shielding mechanism further includes a grounding terminal 24, a busbar 25, and a shielding ring 26. One end of the grounding terminal 24 is welded to the end of the high-frequency shielding layer 21, and the other end of the grounding terminal 24 is connected to the busbar 25. The shielding ring 26 is wrapped around the outer side of the middle part of the grounding terminal 24.

[0037] In use, the grounding terminal 24 is connected to the high-frequency shielding layer 21. The high-frequency interference current intercepted by the high-frequency shielding layer 21 is directly introduced into the busbar 25 through the grounding terminal 24. The busbar 25 and the grounding terminal 24 are connected by a crimping method to form a single-point centralized grounding mode. The shielding ring 26 is made of ferrite material and is tightly fitted on the outside of the grounding terminal 24. It is isolated from the cable body by an insulating sleeve to prevent noise from entering the signal transmission mechanism 1 through the connection point between the grounding terminal 24 and the shielding layer.

[0038] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of a multi-layer anti-shielded signal cable according to the present invention is described in detail as follows: The signal cable 11, as the core conductor, transmits electrical signals. The outer insulation layer 12 blocks signal leakage to the outside through high insulation, while preventing external interference from directly intruding into the conductor, providing basic isolation for the shielding mechanism. The high-frequency shielding layer 21 forms an electromagnetic barrier through a continuous conductive layer, preventing high-frequency energy from penetrating. The low-frequency shielding layer 22 guides the remaining low-frequency interference into the grounding system through a low-impedance path. The pulse shielding layer 23 absorbs instantaneous pulse energy using damping characteristics and diverts pulse interference to the grounding end. The protective mechanism 3 is wrapped around the outermost shielding layer, absorbing external stress through mechanical buffering, preventing the shielding layer from deteriorating due to physical damage, and isolating the shielding layer from environmental factors such as water vapor and dust.

[0039] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A multi-layered anti-shielding signal cable, characterized in that, include: A transmission mechanism, comprising a signal cable and an insulating layer, wherein the insulating layer is disposed on the outside of the signal cable; A shielding mechanism, comprising a high-frequency shielding layer, a low-frequency shielding layer, and a pulse shielding layer, wherein the low-frequency shielding layer is disposed outside the high-frequency shielding layer, the pulse shielding layer is disposed outside the low-frequency shielding layer, the high-frequency shielding layer is used to shield high-frequency radiation, the low-frequency shielding layer is used to shield low-frequency radiation, and the pulse shielding layer is used to shield pulse radiation; as well as, A protective mechanism is located outside the pulse shielding layer and is used to protect the transmission mechanism and the shielding mechanism.

2. The multi-layer anti-shielding signal cable according to claim 1, characterized in that, The high-frequency shielding layer includes an aluminized polyester film, which is spirally wound around the outside of the insulating layer.

3. The multi-layer anti-shielding signal cable according to claim 1, characterized in that, The high-frequency shielding layer also includes a nano-carbon coating, which is attached to the side of the aluminized polyester film near the low-frequency shielding layer.

4. The multi-layer anti-shielding signal cable according to claim 1, characterized in that, A pressure-sensitive adhesive layer is applied to the middle part of the high-frequency shielding layer near the insulating layer, and a curing adhesive layer is applied to both ends of the high-frequency shielding layer near the insulating layer.

5. A multi-layer anti-shielding signal cable according to claim 2, characterized in that, The low-frequency shielding layer includes a tinned copper wire braided mesh, which is spirally wound around the outside of an aluminized polyester film.

6. A multi-layer anti-shielding signal cable according to claim 5, characterized in that, The pulse shielding layer includes a conductive rubber layer, a copper foil, and conductive particles. The copper foil is disposed on both sides of the conductive rubber layer, the conductive particles are disposed inside the conductive rubber layer, and the conductive rubber layer is spirally wound around the outside of a tin-plated copper wire braided mesh.

7. A multi-layer anti-shielding signal cable according to claim 1, characterized in that, The protective mechanism includes a protective sleeve and a buffer layer. The buffer layer is located outside the pulse shielding layer, and the protective sleeve is located outside the buffer layer.

8. A multi-layer anti-shielding signal cable according to claim 1, characterized in that, The shielding mechanism also includes a grounding terminal, a busbar, and a shielding ring. One end of the grounding terminal is connected to the high-frequency shielding layer, and the other end of the grounding terminal is connected to the busbar. The shielding ring is connected to the outside of the grounding terminal.

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