Flame-retardant power cable capable of preventing electromagnetic interference

Abstract

The utility model discloses a flame-retardant power cable capable of preventing electromagnetic interference. The flame-retardant power cable comprises a cable core, a cable core is arranged in the cable core, the cable core is composed of a central cable core and six outer ring cable cores surrounding the central cable core, a composite anti-electromagnetic interference layer is arranged outside the cable core, and the composite anti-electromagnetic interference layer is composed of a metal woven mesh shielding layer, a soft film shielding layer and an insulation filling layer. The metal woven mesh shielding layers are woven on the outer wall of the cable core in a staggered mode, the composite anti-electromagnetic interference layer is externally provided with a composite flame-retardant layer, the composite flame-retardant layer is composed of a flame-retardant substrate layer, an inorganic flame-retardant filler layer and a flame-retardant coating, the composite anti-electromagnetic interference layer is wrapped with the flame-retardant substrate layer in an extruded mode, and the inorganic flame-retardant filler layer is coated with the flame-retardant coating in an extruded mode. And an outer sheath is arranged outside the composite flame-retardant layer, and the outer sheath is composed of a wear-resistant layer and an anti-corrosion layer, so that the problem that signal transmission is hindered due to external electromagnetic interference of the power cable is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a flame-retardant power cable capable of preventing electromagnetic interference. Background Art

[0002] Power cables are used to transmit and distribute electrical energy, and are mainly composed of conductors (cores), insulation layers, protective layers, etc. Power cables are usually installed underground, in water, in trenches, tunnels, or inside buildings, and are used to connect power plants, substations, transformers, motors, electrical equipment, and various types of electrical equipment in the power system to achieve the transmission and distribution of electrical energy. The conductors of power cables are usually made of materials with high conductivity, such as copper or aluminum, which can effectively reduce the loss of electrical energy during transmission.

[0003] For example, the Chinese authorized patent "A Power Cable" with announcement number CN209496657U includes several cable units, a wrapping tape is arranged on the outside of the several cable units, a filling tape is arranged between the wrapping tape and the several cable units, an inner sheath, an armor layer and an outer sheath are arranged in sequence on the outside of the wrapping tape, each cable unit includes several cores, a metal outer shell layer is arranged on the outside of the several cores, XLPE insulating material is arranged between the metal outer shell layer and the several cores, and an insulating shielding layer and a metal shielding layer are arranged in sequence on the outside of the metal outer shell.

[0004] In actual use of the above-mentioned prior art, when the cable is subject to external electromagnetic interference, the interference signal will enter the cable through the cable shielding layer, causing electromagnetic interference. This situation will cause the equipment to fail to operate normally or signal transmission to be interfered with, so it does not meet the existing needs. In this regard, we propose a flame-retardant power cable that is anti-electromagnetic interference. Utility Model Content

[0005] The utility model aims to provide a flame-retardant power cable that is resistant to electromagnetic interference, so as to solve the problem in the above-mentioned background technology that the power cable is hindered in signal transmission due to external electromagnetic interference.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electromagnetic interference-proof flame-retardant power cable, comprising a cable core, a wire core is arranged inside the cable core, and the wire core is composed of a central wire core and six outer ring wire cores surrounding the central wire core, a composite electromagnetic interference-proof layer is arranged outside the cable core, the composite electromagnetic interference-proof layer is composed of a metal braided mesh shielding layer, a soft film shielding layer and an insulating filling layer, and the metal braided mesh shielding layer is interlaced and woven on the outer wall of the cable core, a composite flame-retardant layer is arranged outside the composite electromagnetic interference-proof layer, the composite flame-retardant layer is composed of a flame-retardant base layer, an inorganic flame-retardant filler layer and a flame-retardant coating, and the flame-retardant base layer is extruded and wrapped on the outside of the composite electromagnetic interference-proof layer, an outer sheath is arranged outside the composite flame-retardant layer, and the outer sheath is composed of a wear-resistant layer and an anti-corrosion layer.

[0007] Preferably, the wire core comprises a conductor, an inner insulating layer and an inner shielding layer, the conductor is formed by twisting a plurality of copper wires, the inner insulating layer is extruded and wrapped around the outside of the conductor, and the inner shielding layer is spirally wound around the outside of the inner insulating layer.

[0008] Preferably, the soft film shielding layer is located outside the metal braided mesh shielding layer, and the metal braided mesh shielding layer and the soft film shielding layer are bonded and fixed by hot melt adhesive, and the insulating filling layer is arranged outside the soft film shielding layer.

[0009] Preferably, the inorganic flame retardant filler layer is located outside the flame retardant base layer, and the flame retardant base layer is adhered and fixed to the inorganic flame retardant filler layer, and the flame retardant coating is coated on the outside of the inorganic flame retardant filler layer.

[0010] Preferably, the wear-resistant layer is extruded and wrapped around the outside of the composite flame-retardant layer, and the anti-corrosion layer is extruded and wrapped around the outside of the wear-resistant layer.

[0011] Preferably, the cross-sections of the cable core, wire core, composite anti-electromagnetic interference layer and composite flame-retardant layer are all hexagonal structures.

[0012] Preferably, the braiding angle of the metal braided mesh shielding layer is controlled between 30-45°, and the single-layer braiding coverage is above 80%.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model is provided with a composite anti-electromagnetic interference layer, a metal braided mesh shielding layer and a soft film shielding layer are combined to form a multi-layer composite anti-electromagnetic interference layer, which can effectively absorb and shield external electromagnetic interference to ensure the stable transmission of data inside the cable. The insulating filling layer not only enhances the insulation performance of the cable, but also improves the stability and roundness of the cable structure, further enhancing the safety and reliability of the cable. The flame-retardant material and structural design enable the cable to effectively prevent combustion in the event of a fire, reduce the spread of fire, improve the safety performance of the cable, and the structure is stable and round: through the multi-layer composite anti-electromagnetic interference layer design, the cable structure is more stable, round, not easy to deform, and the reliability and safety of the cable are improved.

[0015] 2. The utility model is provided with a composite flame retardant layer, through the combination of a flame retardant base layer, an inorganic flame retardant filler layer and a flame retardant coating, the composite flame retardant layer can effectively prevent the spread of flames when a fire occurs, and reduce the damage to the cable caused by the fire. The flame retardant base layer adopts high temperature resistant materials, which can maintain structural stability at high temperatures and is not easy to deform or melt, thereby ensuring the safe operation of the cable under extreme conditions. The use of inorganic flame retardants reduces the emission of harmful gases and smoke generated by the cable during combustion, which is more environmentally friendly. Through the protection of the composite flame retardant layer, the cable has been significantly improved in terms of anti-electromagnetic interference and flame retardant properties, thereby improving the overall performance and use value of the cable.

[0016] 3. The utility model is provided with an outer sheath, and the wear-resistant layer is made of highly wear-resistant materials, which can significantly extend the service life of the cable and reduce cable damage caused by external wear. The anti-corrosion layer can effectively resist chemical corrosion and electrochemical corrosion, and protect the safe and stable operation of the cable in harsh environments. The multi-layer structure design enables the outer sheath to adapt to different environmental conditions, including high temperature, low temperature, humidity, dryness, etc., thereby improving the reliability and service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall stereogram of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall internal structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the composite anti-electromagnetic interference layer of the utility model;

[0020] Figure 4 This is a schematic diagram of the composite flame retardant layer structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the outer sheath structure of the utility model.

[0022] In the figure: 1. cable core; 2. wire core; 21. conductor; 22. inner insulation layer; 23. inner shielding layer; 3. composite anti-electromagnetic interference layer; 31. metal braided mesh shielding layer; 32. soft film shielding layer; 33. insulating filling layer; 4. composite flame retardant layer; 41. flame retardant base layer; 42. inorganic flame retardant filler layer; 43. flame retardant coating; 5. outer sheath; 51. wear-resistant layer; 52. anti-corrosion layer. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] See also Figure 1-5 The utility model provides an embodiment: an electromagnetic interference-proof flame-retardant power cable, comprising a cable core 1; a wire core 2 is arranged inside the cable core 1, and the wire core 2 is composed of a central wire core and six outer ring wire cores surrounding the central wire core, a composite electromagnetic interference-proof layer 3 is arranged outside the cable core 1, the composite electromagnetic interference-proof layer 3 is composed of a metal braided mesh shielding layer 31, a soft film shielding layer 32 and an insulating filling layer 33, and the metal braided mesh shielding layer 31 is interlaced and woven on the outer wall of the cable core 1, a composite flame-retardant layer 4 is arranged outside the composite electromagnetic interference-proof layer 3, the composite flame-retardant layer 4 is composed of a flame-retardant base layer 41, an inorganic flame-retardant filler layer 42 and a flame-retardant coating 43, and the flame-retardant base layer 41 is extruded and wrapped outside the composite electromagnetic interference-proof layer 3, an outer sheath 5 is arranged outside the composite flame-retardant layer 4, and the outer sheath 5 is composed of a wear-resistant layer 51 and an anti-corrosion layer 52.

[0025] The composite anti-electromagnetic interference layer 3 on the outside of the cable core 1 not only improves the electromagnetic shielding and insulation properties of the cable through its innovative composition structure, but also enhances the flame retardant properties and structural stability of the cable. The design of the composite flame retardant layer 4 not only improves the flame retardant properties of the cable, but also enhances the mechanical strength and wear resistance of the cable, thereby extending the service life of the cable. The outer sheath 5 provides all-round protection for the cable through its multi-layer structure and the selection of specific materials, thereby improving the durability, wear resistance, corrosion resistance, flame retardancy and electrical insulation properties of the cable, thereby enabling the cable to operate safely and stably in complex environments.

[0026] See also Figure 1 and Figure 2The core 2 includes a conductor 21, an inner insulating layer 22 and an inner shielding layer 23. The conductor 21 is formed by twisting multiple copper wires. The inner insulating layer 22 is extruded and wrapped on the outside of the conductor 21. The inner shielding layer 23 is spirally wound on the outside of the inner insulating layer 22. The conductor 21 is a copper wire for power transmission. The inner insulating layer 22 is cross-linked polyethylene, which isolates the conductor and ensures the transmission of electric energy. It not only has excellent insulation performance, but also has flame retardant function. The inner shielding layer 23 is aluminum foil, which is used to prevent electromagnetic interference and leakage of external electromagnetic fields. It can effectively absorb or reflect electromagnetic waves and reduce interference inside the cable.

[0027] See also Figure 3 , the soft film shielding layer 32 is located outside the metal braided mesh shielding layer 31, and the metal braided mesh shielding layer 31 and the soft film shielding layer 32 are fixed by hot melt adhesive, and the insulating filling layer 33 is arranged outside the soft film shielding layer 32. The metal braided mesh shielding layer 31 is woven from tinned copper wire to form a dense metal shielding mesh; the soft film shielding layer 32 is made of soft aluminum foil and polyester film composite, and the surface of the aluminum foil is coated with hot melt adhesive. The aluminum foil layer is tightly attached to the outside of the metal braided mesh shielding layer to form a continuous shielding layer, which can further reflect and absorb electromagnetic interference and enhance the electromagnetic shielding effectiveness of the cable. At the same time, the hot melt adhesive coating can enhance the close fit between the aluminum foil and the cable core insulation and improve the shielding effect; the insulating filling layer 33 is made of flame-retardant materials with good insulation performance to ensure the stability and roundness of the cable structure and protect the internal cable core from external mechanical damage.

[0028] See also Figure 4 The inorganic flame retardant filler layer 42 is located on the outside of the flame retardant base layer 41, and the flame retardant base layer 41 is adhered and fixed to the inorganic flame retardant filler layer 42, and the flame retardant coating 43 is coated on the outside of the inorganic flame retardant filler layer 42. The flame retardant base layer 41 is thermoplastic polyurethane, which serves as the basis of the composite flame retardant layer and is in direct contact with the anti-electromagnetic interference layer. It can maintain structural stability at high temperatures and is not easy to burn; the inorganic flame retardant filler layer 42 uses inorganic flame retardants such as aluminum oxide, aluminum hydroxide, and magnesium hydroxide, which can release water vapor at high temperatures to dilute combustible gases and form a protective layer to isolate oxygen; the flame retardant coating 43 is a polymer coating containing flame retardant additives, such as polysiloxane, polyphosphazene, etc., which can form a carbonized layer during combustion to isolate oxygen and heat, thereby preventing the spread of flames.

[0029] See also Figure 5 The wear-resistant layer 51 is extruded and wrapped on the outside of the composite flame-retardant layer 4, and the anti-corrosion layer 52 is extruded and wrapped on the outside of the wear-resistant layer 51. The wear-resistant layer 51 is polytetrafluoroethylene rubber, which can resist external mechanical wear and physical impact; the anti-corrosion layer 52 is fluoroplastic, which can effectively resist the erosion of chemical substances such as acid, alkali, and salt.

[0030] See also Figure 1 and Figure 2The cross-sections of the cable core 1, the wire core 2, the composite anti-electromagnetic interference layer 3 and the composite flame retardant layer 4 are all hexagonal in structure. The hexagonal structure has extremely high structural stability due to the characteristics of equal length of each side and equal size of each angle. In the cable, this structural stability can ensure that the cable is not easily deformed when subjected to external force, thereby improving the overall mechanical properties of the cable; compared with the traditional circular structure, the hexagonal structure has better contact performance and contact area at the cable joint, thereby improving the efficiency and stability of current transmission; it can arrange the wire cores more closely within the same cross-sectional area, thereby improving the space utilization of the cable.

[0031] Furthermore, the braiding angle of the metal braided mesh shielding layer 31 is controlled between 30-45°, and the single-layer braiding coverage is above 80%. The electromagnetic energy is converted into other forms such as heat energy through mechanisms such as hysteresis loss, dielectric loss, and resistance loss, thereby effectively absorbing and shielding electromagnetic interference.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A flame-retardant power cable for preventing electromagnetic interference, comprising a cable core (1); characterized in that: The cable core (1) is provided with a wire core (2) inside, and the wire core (2) is composed of a central wire core and six outer ring wire cores surrounding the central wire core; the cable core (1) is provided with a composite anti-electromagnetic interference layer (3) outside, and the composite anti-electromagnetic interference layer (3) is composed of a metal braided mesh shielding layer (31), a soft film shielding layer (32) and an insulating filling layer (33), and the metal braided mesh shielding layer (31) is interlaced and woven on the outer wall of the cable core (1); the composite anti-electromagnetic interference layer (3) is provided with a composite flame retardant layer (4) outside, and the composite flame retardant layer (4) is composed of a flame retardant base layer (41), an inorganic flame retardant filler layer (42) and a flame retardant coating (43), and the flame retardant base layer (41) is extruded and wrapped outside the composite anti-electromagnetic interference layer (3); the composite flame retardant layer (4) is provided with an outer sheath (5) outside, and the outer sheath (5) is composed of a wear-resistant layer (51) and an anti-corrosion layer (52).

2. The flame-retardant power cable with electromagnetic interference protection according to claim 1, characterized in that: The wire core (2) comprises a conductor (21), an inner insulating layer (22) and an inner shielding layer (23); the conductor (21) is formed by twisting a plurality of copper wires; the inner insulating layer (22) is extruded and wrapped around the outside of the conductor (21); and the inner shielding layer (23) is spirally wound around the outside of the inner insulating layer (22).

3. The flame-retardant power cable with electromagnetic interference protection according to claim 1, characterized in that: The soft film shielding layer (32) is located outside the metal braided mesh shielding layer (31), and the metal braided mesh shielding layer (31) and the soft film shielding layer (32) are bonded and fixed by hot melt adhesive, and the insulating filling layer (33) is arranged outside the soft film shielding layer (32).

4. The flame-retardant power cable with electromagnetic interference protection according to claim 1, characterized in that: The inorganic flame retardant filler layer (42) is located outside the flame retardant base layer (41), and the flame retardant base layer (41) is adhered and fixed to the inorganic flame retardant filler layer (42), and the flame retardant coating (43) is coated on the outside of the inorganic flame retardant filler layer (42).

5. The flame-retardant power cable with electromagnetic interference protection according to claim 1, characterized in that: The wear-resistant layer (51) is extruded and wrapped around the outside of the composite flame-retardant layer (4), and the anti-corrosion layer (52) is extruded and wrapped around the outside of the wear-resistant layer (51).

6. The flame-retardant power cable with electromagnetic interference protection according to claim 1, characterized in that: The cross-sections of the cable core (1), the wire core (2), the composite electromagnetic interference protection layer (3) and the composite flame retardant layer (4) are all in a hexagonal structure.

7. The electromagnetic interference-proof flame-retardant power cable according to claim 3, characterized in that: The braiding angle of the metal braided mesh shielding layer (31) is controlled between 30-45 degrees, and the single-layer braiding coverage is above 80%.

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