Fire resistant halogen-free shielded wire

Abstract

The utility model discloses a fireproof halogen-free shielding wire, including conductor and by inside to outside cover in the conductor outside insulation layer, inner shielding layer, inner protective sleeve, outer shielding layer and outer protective sleeve in proper order, the inner shielding layer includes the inner mylar layer that is spirally wound in the insulation layer outside along the conductor length direction positive, and the inner braid layer that is tightly covered in the inner mylar layer outside, the outer shielding layer includes the outer mylar layer that is spirally wound in the inner protective sleeve outside along the conductor length direction reverse, and the outer braid layer that is tightly covered in the outer mylar layer outside, the utility model discloses a fireproof halogen-free shielding wire, through the cooperation of inner shielding layer and outer shielding layer, makes the shielding wire on the basis of halogen-free material, realizes high anti -interference ability and fire resistance.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, and in particular to a fireproof halogen-free shielded wire. Background Technology

[0002] As a classic coaxial transmission cable, the RG58 coaxial cable is widely used in data transmission fields (such as electronic device connections and signal transmission links) due to its coaxial structure between the center conductor and the shield. Its core requirement is to achieve stable high-frequency signal or power transmission through the synergistic effect of the center conductor and the shield, while relying on the insulation layer between the conductor and the shield to maintain a fixed distance to ensure transmission performance.

[0003] For example, Chinese Patent Publication No. CN208690469U discloses a low-loss RG58 coaxial cable, comprising an inner conductor, a foamed insulating layer formed on the outer periphery of the inner conductor, an aluminum foil layer formed on the outer periphery of the foamed insulating layer, a Mylar layer formed on the outer periphery of the aluminum foil layer, and a conductive braided layer formed on the outer periphery of the Mylar layer. The cavity volume in the foamed insulating layer accounts for at least 50% of the total volume of the foamed insulating layer. The aluminum foil layer and the foamed insulating layer can reduce high-frequency attenuation loss, and because the cavity volume in the foamed insulating layer accounts for at least 50% of the total volume of the foamed insulating layer, the attenuation loss of the low-loss RG58 coaxial cable is very low.

[0004] The above application still has shortcomings. Its coaxial cable halogen-free shielded wire uses a single shielding layer, which can provide a certain electromagnetic shielding effect, but the effect is limited in high electromagnetic interference environment. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a halogen-free shielded wire with strong anti-interference capability.

[0006] The present invention adopts the following technical solution:

[0007] Fireproof halogen-free shielded wire, comprising a conductor, and an insulating layer, an inner shielding layer, an inner protective sleeve, an outer shielding layer, and an outer protective sleeve, which are sequentially wrapped around the outside of the conductor from the inside out;

[0008] The inner shielding layer includes an inner Mylar layer that is spirally wound in the forward direction along the length of the conductor and wrapped tightly with an inner braided layer.

[0009] The outer shielding layer includes an outer Mylar layer that is spirally wound in the opposite direction along the length of the conductor and wrapped tightly around the outer Mylar layer.

[0010] Furthermore, the inner Mylar layer is a double-sided aluminum foil layer; the double-sided aluminum foil layer is spirally wound around the outside of the insulating layer at an inclination angle of 30° to 45°, and the aluminum foil side of the double-sided aluminum foil layer faces the insulating layer.

[0011] Furthermore, the thickness of the inner braided layer is 0.12–0.13 mm.

[0012] Furthermore, the outer Mylar layer is a single-sided adhesive aluminum foil layer; the aluminum foil layer is spirally wound in the opposite direction at an inclination angle of 30° to 45° on the outside of the inner protective sleeve, and the adhesive side of the aluminum foil layer is tightly attached to the outside of the inner protective sleeve.

[0013] Furthermore, the inner protective sleeve is a thermoplastic elastomer that is extruded and coated on the outside of the inner shielding layer.

[0014] Furthermore, the outer protective sleeve is a thermoplastic elastomer that is extruded and coated on the outside of the outer shielding layer.

[0015] Furthermore, the insulating layer is a foamed polypropylene layer that is extruded and coated on the outside of the conductor.

[0016] Furthermore, the thickness of the insulating layer is 2.8–3.0 mm.

[0017] Furthermore, the inner braided layer is made of copper-plated metal wire with a braiding density greater than or equal to 90%.

[0018] Furthermore, the outer braided layer is made of copper-plated metal wire with a braiding density greater than or equal to 90%.

[0019] The beneficial effects of this utility model are as follows:

[0020] The fireproof halogen-free shielded cable of this utility model achieves high anti-interference capability and fire resistance based on halogen-free materials through the cooperation of the inner shielding layer and the outer shielding layer. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a fireproof halogen-free shielded wire according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 A cross-sectional view of a fireproof halogen-free shielded cable.

[0023] Reference numerals: 10, conductor; 20, insulating layer; 30, inner shielding layer; 40, inner protective sleeve; 50, outer shielding layer; 60, outer protective sleeve; 31, inner Mylar layer; 32, inner braided layer; 51, outer Mylar layer; 52, outer braided layer. Detailed Implementation

[0024] 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.

[0025] In the description of this utility model, it should be noted that the terms "vertical direction," "up," "down," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Please see Figure 1 and Figure 2 The fireproof halogen-free shielded wire according to one embodiment of the present utility model includes a conductor 10, and an insulation layer 20, an inner shielding layer 30, an inner protective sleeve 40, an outer shielding layer 50 and an outer protective sleeve 60 that are sequentially wrapped around the outside of the conductor 10 from the inside to the outside.

[0028] The inner shielding layer 30 includes an inner Mylar layer 31 that is spirally wound in the forward direction along the length of the conductor 10 on the outside of the insulating layer 20, and an inner braided layer 32 that is tightly wrapped around the outside of the inner Mylar layer 31.

[0029] The outer shielding layer 50 includes an outer Mylar layer 51 that is spirally wound in the opposite direction along the length of the conductor 10 on the outside of the inner protective sleeve 40, and an outer braided layer 52 that is tightly wrapped around the outside of the outer Mylar layer 51.

[0030] The working principle of this fireproof halogen-free shielded cable is as follows: When the fireproof halogen-free shielded cable is working, the conductor 10 serves as the core for transmitting electrical energy or signals; the insulation layer 20 isolates the conductor 10 from the outside, preventing short circuits and ensuring signal stability; the inner Mylar layer 31 of the inner shielding layer 30 assists in shielding and supporting the structure, and the inner braided layer 32 cancels internal and external electromagnetic interference through electromagnetic induction, protecting the internal signal; the inner protective sleeve 40 protects the inner shielding layer 30 from damage; the outer Mylar layer 51 and outer braided layer 52 of the outer shielding layer 50 further enhance the anti-interference capability; the outer protective sleeve 60 provides an outer layer of protection for the whole, and throughout the entire working process, all insulation and protective materials maintain halogen-free characteristics and do not release toxic gases when exposed to fire, ensuring safe use.

[0031] Compared to existing technologies, the fire-resistant halogen-free shielded cable of this invention, through the cooperation of the inner shielding layer 30 and the outer shielding layer 50, achieves high anti-interference capability and fire resistance on the basis of halogen-free materials; all insulation and protective materials are made of halogen-free materials, which do not release toxic gases when exposed to fire, ensuring safe use; electromagnetic induction cancels out internal and external electromagnetic interference, protecting the stability and integrity of internal signals; the inner Mylar layer 31 provides auxiliary shielding and structural support, enhancing the mechanical strength of the cable; the inner braided layer 32 cancels out internal and external electromagnetic interference through electromagnetic induction, protecting the stability and integrity of internal signals; the outer Mylar layer 51 further enhances the shielding effect, provides additional protection, further improves the electromagnetic shielding effect, and ensures the stability of signal transmission.

[0032] Please see Figure 1 and Figure 2 The inner Mylar layer 31 is a double-sided aluminum foil layer. This double-sided aluminum foil layer is spirally wound around the outside of the insulation layer 20 at an angle of 30° to 45°, with the aluminum foil side facing the insulation layer 20. Specifically, the double-sided aluminum foil layer is spirally wound around the insulation layer 20 at an angle of 37°. This spiral winding effectively blocks the penetration of electromagnetic waves, especially at specific angles, making it difficult for electromagnetic waves to pass through, thus improving the cable's anti-interference capability. The spiral winding structure also enhances the cable's mechanical strength, making it less prone to damage during bending and stretching, thereby increasing the cable's service life. Furthermore, spiral winding reduces signal attenuation and distortion during transmission, improving the stability and reliability of signal transmission.

[0033] The thickness of the inner braided layer 32 is 0.12–0.13 mm; specifically, the thickness of the inner braided layer 32 is 0.127 mm. Within this thickness range, the inner braided layer 32 provides good electromagnetic shielding performance, effectively blocking external electromagnetic interference while reducing internal signal leakage. Appropriate thickness can improve the mechanical strength of the inner braided layer 32, making it less susceptible to damage under external forces and extending the cable's service life. Within the 0.12–0.13 mm range, the inner braided layer 32 exhibits good flexibility, making the cable more flexible when bending and moving, and less prone to breakage or cracking.

[0034] The outer Mylar layer 51 is a single-sided adhesive aluminum foil layer. This aluminum foil layer is spirally wound in a reverse direction at an angle of 30°–45° around the outside of the inner protective sleeve 40, with the adhesive side of the aluminum foil layer tightly adhered to the outside of the inner protective sleeve 40. Specifically, the aluminum foil layer is spirally wound in a reverse direction at an angle of 37° around the inner protective layer. This reverse spiral winding complements the forward spiral winding of the inner layer, more effectively blocking electromagnetic wave penetration and improving the overall shielding performance of the cable. The double-layer spiral winding structure increases the mechanical strength of the cable, making it more stable under stress and reducing the risk of damage. Furthermore, the double-layer spiral winding structure further reduces signal attenuation and distortion during transmission, improving the stability and reliability of signal transmission.

[0035] The inner protective sleeve 40 is a thermoplastic elastomer that is extruded and coated onto the outside of the inner shielding layer 30. Thermoplastic elastomers possess excellent physical and chemical properties, effectively protecting the inner shielding layer 30 from external environmental influences such as moisture, chemical corrosion, and mechanical damage. Their superior flexibility allows the cable to bend and move more easily, reducing the risk of breakage or cracking. Furthermore, the thermoplastic elastomer can be conveniently coated onto the inner shielding layer 30 through an extrusion process, making the production process efficient and controllable, thus improving production efficiency and quality consistency.

[0036] The outer protective sleeve 60 is a thermoplastic elastomer that is extruded and coated onto the outside of the outer shielding layer 50. Thermoplastic elastomers possess excellent physical and chemical properties, effectively protecting the outer shielding layer 50 from external environmental influences such as moisture, chemical corrosion, and mechanical damage. Their superior flexibility allows the cable to bend and move more easily, reducing the risk of breakage or cracking, thus improving the cable's ease of use and safety. Furthermore, the thermoplastic elastomer can be conveniently coated onto the outer shielding layer 50 through an extrusion process, which is highly efficient and controllable, contributing to improved production efficiency and quality consistency.

[0037] The insulation layer 20 is a foamed polypropylene layer that is extruded and coated on the outside of the conductor 10. Foamed polypropylene has good electrical insulation properties, which can effectively prevent current leakage and ensure the safe use of the cable; the low density of foamed polypropylene can significantly reduce the weight of the cable, making it easier to install and handle, especially for long-distance laying; foamed polypropylene has good flexibility, making the cable more flexible when bending and moving, less prone to cracking or breaking, and improving the service life of the cable.

[0038] The thickness of the insulation layer 20 is 2.8–3.0 mm; specifically, the thickness of the insulation layer 20 is 2.9 mm; in other embodiments, the thickness of the insulation layer 20 is 4.7–5.1 mm; specifically, the thickness of the insulation layer 20 is 4.9 mm. Suitable for conventional operating environments, it provides sufficient electrical insulation performance to ensure the safety and reliability of the cable; suitable for high-voltage or high-current applications, it provides stronger electrical insulation performance to ensure safe use under harsh conditions; in conventional applications, the moderate thickness can effectively reduce signal attenuation and distortion during transmission, improving the stability and reliability of signal transmission; in demanding applications, a thicker insulation layer 20 can further reduce signal interference and attenuation, improving the quality of signal transmission.

[0039] The inner braided layer 32 is made of copper-plated metal wire with a braiding density greater than or equal to 90%. The high braiding density provides excellent electromagnetic shielding, effectively preventing external electromagnetic interference and internal signal leakage, and improving the cable's anti-interference capability and signal transmission quality. Copper has good conductivity, which can effectively shield electromagnetic interference and ensure the stability and reliability of signal transmission.

[0040] The outer braided layer 52 is made of copper-plated metal wire with a braiding density greater than or equal to 90%. The high-density braided layer can provide excellent electromagnetic shielding, effectively preventing external electromagnetic interference and leakage of internal electromagnetic signals, and improving the signal transmission quality and reliability of the cable; copper has excellent conductivity, which can effectively reduce resistance during signal transmission and reduce signal attenuation.

[0041] The above description merely illustrates the preferred technical solution of this utility model, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A fire-resistant halogen-free shielded cable, characterized in that, It includes a conductor, and an insulating layer, an inner shielding layer, an inner protective sleeve, an outer shielding layer, and an outer protective sleeve that are sequentially wrapped around the outside of the conductor from the inside out; The inner shielding layer includes an inner Mylar layer that is spirally wound in the forward direction along the length of the conductor and wrapped tightly with an inner braided layer. The outer shielding layer includes an outer Mylar layer that is spirally wound in the opposite direction along the length of the conductor and wrapped tightly around the outer Mylar layer.

2. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The inner Mylar layer is a double-sided aluminum foil layer; the double-sided aluminum foil layer is spirally wound around the outside of the insulating layer at an inclination angle of 30° to 45°, and the aluminum foil side of the double-sided aluminum foil layer faces the insulating layer.

3. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The thickness of the inner braided layer is 0.12–0.13 mm.

4. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The outer Mylar layer is a single-sided adhesive aluminum foil layer; the aluminum foil layer is spirally wound in the opposite direction at an inclination angle of 30° to 45° on the outside of the inner protective sleeve, and the adhesive side of the aluminum foil layer is tightly attached to the outside of the inner protective sleeve.

5. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The inner protective sleeve is a thermoplastic elastomer that is extruded and coated on the outside of the inner shielding layer.

6. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The outer protective sleeve is a thermoplastic elastomer that is extruded and coated on the outside of the outer shielding layer.

7. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The insulating layer is a foamed polypropylene layer that is extruded and coated on the outside of the conductor.

8. The fire-resistant halogen-free shielded wire according to claim 1, characterized in that, The thickness of the insulating layer is 2.8–3.0 mm.

9. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The inner braided layer is made of copper-plated metal wire with a braiding density greater than or equal to 90%.

10. The fireproof halogen-free shielded wire according to claim 1, characterized in that, The outer braided layer is made of copper-plated metal wire with a braiding density greater than or equal to 90%.

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