Cold-resistant polyvinyl chloride sheathed power cable

Abstract

The utility model discloses a kind of cold-resistant polyvinyl chloride sheath power cable, it is related to power cable technical field, comprising: the conductor core formed by multiple silver-plated copper alloy conductors, self-repairing insulating layer, nanometer ceramic fiber braided layer, double shielding layer, water-blocking expansion tape wrapping layer, anti-freezing buffer layer and modified cold-resistant PVC sheath are covered in the conductor core outside one side.The utility model cold-resistant polyvinyl chloride sheath power cable is by using modified cold-resistant PVC sheath, low-temperature impact modifier and the like components are added in its formula, so that cable can still maintain good flexibility and impact resistance in cold environment, effectively resist the damage brought by low temperature, ensure the stability of power transmission, widen the application range of power cable in cold region.

Description

Technical Field

[0001] This utility model belongs to the field of power cable technology, specifically a cold-resistant polyvinyl chloride sheathed power cable. Background Technology

[0002] In the field of power transmission, power cables serve as a crucial carrier, and their performance is essential for ensuring the stable operation of power systems. Especially in cold regions, power cables must not only possess good conductivity, mechanical strength, and corrosion resistance, but also withstand the negative effects of low temperatures, such as cold resistance, freeze-cracking resistance, and waterproofing. While traditional power cables meet conventional power transmission requirements to some extent, they still have many shortcomings in dealing with complex and variable cold environments and in terms of performance stability during long-term use.

[0003] The sheath materials of conventional power cables are prone to becoming brittle and cracking at low temperatures, leading to a decline in the cable's mechanical properties and an inability to effectively resist the corrosive effects of cold environments. Especially in extremely cold weather, the cable's flexibility and impact resistance are significantly reduced, making it susceptible to damage and affecting the reliability of power transmission. Materials such as polyvinyl chloride (PVC) and rubber are high-molecular polymers. At low temperatures, the molecular chain mobility in these materials is restricted, making chain segment movement difficult and causing the glass transition temperature to rise. When the ambient temperature falls below the glass transition temperature, the material transitions from a highly elastic state at room temperature to a glassy state. The originally soft and flexible sheath material becomes hard and brittle, with reduced resistance to deformation, making it highly susceptible to micro-cracks under external forces or internal stress, eventually leading to cracking. Traditional insulation layers are also prone to micro-damage under external impact or long-term environmental factors, resulting in decreased insulation performance, increased safety hazards during power transmission, and a reduced cable lifespan. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a cold-resistant polyvinyl chloride sheathed power cable.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cold-resistant polyvinyl chloride sheathed power cable, comprising: a conductor core composed of multiple silver-plated copper alloy conductors, a self-healing insulation layer, a nano-ceramic fiber braided layer, a double shielding layer, a water-blocking expansion tape wrapping layer, an anti-freeze buffer layer, and a modified cold-resistant PVC sheath wrapped around the conductor core on one side.

[0006] Preferably, the conductor core is composed of a combination of multiple copper conductors.

[0007] Preferably, the self-healing insulating layer comprises a thermoplastic polyurethane matrix and a uniformly dispersed microcapsule repair agent, the repair agent comprising a core-shell structure of a two-component epoxy resin and a curing accelerator.

[0008] Preferably, the double shielding layer is composed of an overlapping aluminum foil longitudinal layer and a tin-plated copper wire braided layer.

[0009] Preferably, the antifreeze buffer layer is a closed-cell silicone rubber foam layer, in which granular aerogel particles are uniformly dispersed.

[0010] Preferably, the modified cold-resistant PVC sheath comprises the following components: 100 parts PVC resin, 35-45 parts trioctyl trimellitate plasticizer, 5-8 parts nano silica, 8-12 parts low-temperature impact modifier, 1-2 parts antioxidant, and 3-5 parts carbon black masterbatch.

[0011] Preferably, the low-temperature impact modifier is a composite of ethylene, vinyl acetate copolymer and chlorinated polyethylene.

[0012] Preferably, the water-blocking expansion tape has a double-layer structure, with the inner layer being super absorbent resin non-woven fabric and the outer layer being an aluminum-plastic composite film. The overlap is sealed with hot melt adhesive, and the expansion ratio is ≥300%.

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

[0014] (1) This utility model of cold-resistant polyvinyl chloride sheathed power cable adopts modified cold-resistant PVC sheath, and its formula contains low-temperature impact modifier and other components, so that the cable can still maintain good flexibility and impact resistance in cold environment, effectively resist the damage caused by low temperature, ensure the stability of power transmission, and broaden the application range of power cable in cold regions.

[0015] (2) The self-healing insulation layer of this utility model has microcapsule repair agent uniformly dispersed in the thermoplastic polyurethane matrix, which can automatically repair the insulation layer when it is slightly damaged, maintain the insulation performance of the cable, greatly extend the service life of the cable, reduce the risk of power failure caused by insulation damage, and improve the safety of power transmission.

[0016] (3) The double-layer structure of the waterproof expansion tape wrapping layer of this utility model is as follows: the inner layer of super absorbent resin non-woven fabric expands when it encounters water, quickly blocking the gaps inside the cable; the outer layer of aluminum-plastic composite film further enhances the waterproof performance; the overlap is sealed with hot melt adhesive to ensure that water cannot penetrate into the inside of the cable, protect the internal structure from moisture erosion, and ensure the stability of the electrical performance of the cable.

[0017] (4) This practical double shielding layer is composed of an aluminum foil longitudinal layer with an overlap rate of ≥25% and a tinned copper wire braided layer with a coverage rate of ≥85%. The reasonable design of the braiding angle and density forms an efficient electromagnetic shielding system, which can effectively block external electromagnetic interference and prevent the electromagnetic field inside the cable from leaking outward, ensuring the stability and accuracy of power signal transmission. It is suitable for complex electromagnetic environments and improves the quality of power transmission. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of this utility model. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of this utility model. Figure 2 ;

[0021] In the diagram: 1. Conductor core; 2. Self-healing insulation layer; 3. Nano-ceramic fiber braided layer; 4. Double shielding layer; 5. Water-blocking expansion tape wrapping layer; 6. Anti-freeze buffer layer; 7. Modified cold-resistant PVC sheath. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Example

[0024] Please see Figure 1 - Figure 3 This application provides a cold-resistant polyvinyl chloride sheathed power cable, comprising: a conductor core 1 composed of multiple silver-plated copper alloy conductors, a self-healing insulation layer 2, a nano-ceramic fiber braided layer 3, a double shielding layer 4, a water-blocking expansion tape wrapping layer 5, an anti-freeze buffer layer 6, and a modified cold-resistant PVC sheath 7.

[0025] In this embodiment, preferably, the conductor core 1 is composed of multiple copper conductors.

[0026] More specifically, conductor core 1 is composed of copper conductors with a single wire diameter of 0.15-0.25 mm and a stranding pitch ratio of 10-12.

[0027] In this embodiment, preferably, the self-healing insulating layer 2 comprises a thermoplastic polyurethane matrix and a uniformly dispersed microcapsule repair agent, which comprises a core-shell structure of a dual-component epoxy resin and a curing accelerator.

[0028] More specifically, the self-healing insulation layer 2 contains 85-92% by mass of thermoplastic polyurethane matrix, with microcapsule repair agents of 50-200 μm diameter uniformly dispersed.

[0029] In this embodiment, preferably, the double shielding layer 4 is composed of an overlapping aluminum foil longitudinal layer and a tin-plated copper wire braided layer.

[0030] More specifically, the double shielding layer 4 is composed of an aluminum foil longitudinal layer with an overlap rate of ≥25% and a tin-plated copper wire braided layer with a coverage rate of ≥85%, with a braiding angle of 45-55° and a braiding density of ≥90%.

[0031] In this embodiment, preferably, the antifreeze buffer layer 6 is a closed-cell silicone rubber foam layer, in which granular aerogel particles are uniformly dispersed.

[0032] More specifically, the antifreeze buffer layer 6 is a closed-cell silicone rubber foam layer, in which aerogel particles with a particle size of 20-50μm are uniformly dispersed, accounting for 15-25% of the volume, and with a Shore hardness of 35-45A.

[0033] In this embodiment, preferably, the modified cold-resistant PVC sheath 7 comprises the following components: 100 parts of PVC resin, 35-45 parts of trioctyl trimellitate plasticizer, 5-8 parts of nano silica, 8-12 parts of low-temperature impact modifier, 1-2 parts of antioxidant, and 3-5 parts of carbon black masterbatch.

[0034] In this embodiment, preferably, the low-temperature impact modifier is a composite of ethylene, vinyl acetate copolymer and chlorinated polyethylene.

[0035] More specifically, the low-temperature impact modifier is a composite of ethylene, vinyl acetate copolymer and chlorinated polyethylene, with a mass ratio of 3:1 and a melt index of 2.5-3.5 g / 10 min (190℃ / 2.16 kg).

[0036] In this embodiment, preferably, the water-blocking expansion tape wrapping layer 5 has a double-layer structure, with the inner layer being super absorbent resin non-woven fabric and the outer layer being aluminum-plastic composite film. The overlap is sealed with hot melt adhesive, and the expansion ratio is ≥300%.

[0037] It should be noted that the SAP content of the nonwoven fabric is ≥40%.

[0038] Working principle: The conductor core 1 is made of high-purity electrolytic copper plated with silver. The reasonable design of the single wire diameter and stranding pitch ratio gives it good conductivity, mechanical strength and corrosion resistance, providing a solid foundation for power transmission.

[0039] The self-healing insulation layer 2 contains microcapsule repair agents uniformly dispersed in a thermoplastic polyurethane matrix. It can automatically repair minor damage caused by external forces or environmental factors, maintain the insulation performance of the cable, extend its service life, and ensure power supply safety.

[0040] The double shielding layer 4, through the combination of the longitudinal aluminum foil layer and the tinned copper wire braided layer, forms a highly efficient electromagnetic shielding system, effectively blocking external electromagnetic interference and preventing the leakage of the internal electromagnetic field of the cable, thus ensuring the stability and accuracy of power signal transmission.

[0041] The water-blocking expansion tape 5 expands when it encounters moisture, quickly sealing the gaps inside the cable, preventing further moisture penetration, protecting the internal structure from moisture erosion, and maintaining the electrical performance of the cable.

[0042] The antifreeze buffer layer 6 combines closed-cell silicone rubber foam and aerogel particles to provide the cable with excellent antifreeze and buffering effects, effectively relieving mechanical stress and impact in low-temperature environments and preventing the cable from being damaged by cold.

[0043] The modified cold-resistant PVC sheath gives the cable good overall flexibility and cold resistance, enabling it to maintain good mechanical properties in cold environments and resist external physical and chemical corrosion.

[0044] Overall, the various layers of the structure work together to ensure that the cable can safely and stably transmit power under complex environmental conditions, especially in cold environments.

[0045] The above embodiments are only used to illustrate the technical methods of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of this utility model without departing from the spirit and scope of the technical methods of this utility model.

Claims

1. A cold-resistant polyvinyl chloride sheathed power cable, characterized in that, include: The conductor core (1) is composed of multiple silver-plated copper alloy conductors, and a self-healing insulation layer (2), a nano-ceramic fiber braided layer (3), a double shielding layer (4), a water-blocking expansion tape wrapping layer (5), an anti-freeze buffer layer (6), and a modified cold-resistant PVC sheath (7) are wrapped around the conductor core (1) on one side.

2. The cold-resistant polyvinyl chloride sheathed power cable according to claim 1, characterized in that, The conductor core (1) is composed of multiple copper conductors.

3. The cold-resistant polyvinyl chloride sheathed power cable according to claim 1, characterized in that, The self-healing insulating layer (2) comprises a thermoplastic polyurethane matrix and a uniformly dispersed microcapsule repair agent, which comprises a core-shell structure of a dual epoxy resin and a curing accelerator.

4. The cold-resistant polyvinyl chloride sheathed power cable according to claim 1, characterized in that, The double shielding layer (4) is composed of an overlapping aluminum foil longitudinal layer and a tin-plated copper wire braided layer.

5. The cold-resistant polyvinyl chloride sheathed power cable according to claim 1, characterized in that, The water-blocking expansion strip wrapping layer (5) has a double-layer structure, with the inner layer being super absorbent resin non-woven fabric and the outer layer being aluminum-plastic composite film, and the overlap is sealed with hot melt adhesive.

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