Waterproof and moisture-proof power cable

Abstract

The utility model belongs to the technical field of power cable, especially water -resistant damp -proof power cable, including the conductor of copper or aluminium, the conductor is copper or aluminium, the outer layer of conductor is equipped with cross -linked polyethylene inner insulation layer, the outer layer of cross -linked polyethylene inner insulation layer is covered with semiconductive water -resistant tape wrapping, the outer layer of semiconductive water -resistant tape wrapping is equipped with ethylene -propylene rubber outer insulation layer. The utility model, aiming at the drawback of traditional cable under the damp environment, this cable can effectively block and discharge moisture through tightly stranded conductor and add water -resistant powder and water -resistant yarn, combine multilayer water -resistant, drainage design, prevent conductor oxidation, insulation layer damage, guarantee power transmission efficiency and stability, at the same time, the sub -item shielding layer and aluminium tape shielding layer can shield electromagnetic interference, the self -repairing polypropylene of outer sheath layer can resist harsh environment and self -repair, satisfy 5G base station construction etc. The high demand of power supply reliability, reduce economic loss and accident risk.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically a water-blocking and moisture-proof power cable. Background Technology

[0002] In today's society, power supply plays a vital supporting role in various production and daily life scenarios. As power infrastructure construction continues to expand into complex environments, such as damp underground pipe corridors, rainy coastal areas, industrial plants prone to water accumulation, and underwater power transmission needs, the limitations of traditional power cables are becoming increasingly apparent, which has spurred the development of water-resistant and moisture-proof power cables.

[0003] On the one hand, after prolonged contact with moisture, ordinary power cables are susceptible to moisture seepage through minor breaks in the cable sheath and at cable joints. Once moisture enters, it can cause oxidation and corrosion of the conductor, reducing its conductivity and thus affecting power transmission efficiency, and even leading to power outages. For example, during the renovation of underground power lines in some older residential areas, it is common to find cases of cable aging and damage due to groundwater leakage.

[0004] On the other hand, moisture in humid environments can also cause significant damage to cable insulation. Moisture reduces the insulation resistance of the insulation material, triggers partial discharge, accelerates the aging and damage of the insulation layer, and seriously threatens the safe and stable operation of the power system. For example, during the rainy season in southern China, many outdoor substation cables have experienced insulation failures due to moisture.

[0005] Furthermore, with the rapid development of technology, such as the construction of 5G base stations and the advancement of smart grids, the requirements for the continuity and reliability of power supply have reached new heights. These precision electronic devices and systems cannot tolerate the slightest mishap in power supply. Once a fault occurs due to moisture in the cables, it will not only cause direct economic losses, but may also affect the production and living order of the entire region and trigger a chain reaction.

[0006] To meet these increasingly stringent requirements, researchers and cable manufacturers have invested a great deal of effort in developing water-blocking and moisture-proof power cables. By improving cable structure and adopting new materials, they are committed to creating a "lifeline" for power transmission that can operate stably in complex and humid environments. Summary of the Invention

[0007] Technical problems to be solved

[0008] To address the shortcomings of existing technologies, this utility model provides a water-blocking and moisture-proof power cable, which solves the problems mentioned in the background section.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0011] A water-blocking and moisture-proof power cable includes a copper or aluminum conductor. The conductor has a cross-linked polyethylene inner insulation layer, an outer layer covered with a semi-conductive water-resistant tape wrapping layer, an outer layer of ethylene propylene rubber insulation, an outer layer of phase shielding, an outer layer of water-blocking layer, an outer layer of aluminum tape shielding, an outer layer of drainage layer, an outer layer of polyvinyl chloride (PVC) inner sheath, an outer layer of armor, and an outer sheath.

[0012] Furthermore, the conductors are tightly twisted, and water-blocking powder and water-blocking yarn are added during the twisting process.

[0013] Furthermore, the sub-shielding layer is a conductive plastic, extruded onto the outer layer of the ethylene propylene rubber outer insulation layer.

[0014] Furthermore, the water-blocking layer is a water-blocking tape, which is wrapped in multiple layers around the outer layer of the sub-shielding layer.

[0015] Furthermore, the drainage layer is a drainage grease that fills the voids inside the cable.

[0016] Furthermore, the outer sheath layer is made of self-healing polypropylene.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, this utility model provides a water-blocking and moisture-proof power cable, which has the following beneficial effects:

[0019] This invention addresses the shortcomings of traditional cables in humid environments. By tightly stranding the conductors and adding water-blocking powder and yarn, combined with a multi-layered water-blocking and drainage design, it effectively blocks and drains moisture, preventing conductor oxidation and insulation damage, thus ensuring power transmission efficiency and stability. Simultaneously, the separate shielding layer and aluminum strip shielding layer can shield against electromagnetic interference, and the self-healing polypropylene outer sheath can withstand harsh environments and self-repair, meeting the high reliability requirements of power supply for 5G base station construction and reducing economic losses and accident risks. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a side view of the structure of this utility model.

[0022] In the diagram: 1. Conductor; 2. Cross-linked polyethylene inner insulation layer; 3. Water-blocking tape wrapping layer; 4. Ethylene propylene rubber outer insulation layer; 5. Sub-phase shielding layer; 6. Water-blocking layer; 7. Aluminum tape shielding layer; 8. Drainage layer; 9. Polyvinyl chloride inner sheath layer; 10. Armoring layer; 11. Outer sheath layer. Detailed Implementation

[0023] 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.

[0024] Example

[0025] like Figure 1-2 As shown, an embodiment of the present invention provides a water-blocking and moisture-proof power cable, comprising a copper or aluminum conductor 1, wherein the conductor 1 is copper or aluminum;

[0026] Copper and aluminum have excellent electrical conductivity, ensuring efficient power transmission; tight twisting reduces internal gaps and the possibility of moisture intrusion, while water-blocking powder and water-blocking yarn can quickly play a role when they encounter moisture, absorbing and blocking further moisture penetration, protecting conductor 1 from oxidation and corrosion from the source and maintaining good electrical conductivity.

[0027] The outer layer of the conductor 1 is provided with a cross-linked polyethylene inner insulation layer 2;

[0028] It isolates conductor 1 from the external electric field to prevent current leakage and ensure the safety of power transmission; at the same time, thanks to its waterproof properties, it prevents a small amount of external moisture from approaching conductor 1, providing initial moisture protection for conductor 1.

[0029] The outer layer of the cross-linked polyethylene inner insulation layer 2 is covered with a semi-conductive resistive water tape wrapping layer 3.

[0030] On the one hand, it acts as a buffer for the electric field, making the electric field distribution more uniform and avoiding insulation problems caused by excessively high local electric fields; on the other hand, it can expand rapidly when it comes into contact with water, forming a dense water barrier, effectively preventing water from spreading longitudinally along the cable and preventing water from penetrating into the core area inside the cable over a large area.

[0031] The outer layer of the semiconducting resistive water tape wrapping layer 3 is provided with an ethylene propylene rubber outer insulation layer 4.

[0032] It further enhances the insulation effect and works in synergy with the cross-linked polyethylene inner insulation layer 2 to provide double protection for the insulation safety of power transmission; at the same time, due to its excellent water resistance, it can resist moisture erosion in humid environments and extend the service life of the cable in harsh environments.

[0033] The outer layer of the ethylene propylene rubber outer insulation layer 4 is provided with a phase shielding layer 5;

[0034] It shields against external electromagnetic interference, preventing external electromagnetic signals from affecting the power signals transmitted within the cable and ensuring the stability and purity of power transmission. In addition, the properties of conductive plastic enable it to quickly conduct away the charge generated by electromagnetic induction, avoiding potential problems caused by charge accumulation.

[0035] The outer layer of the sub-shielding layer 5 is provided with a water-blocking layer 6;

[0036] The multi-layer structure greatly enhances the water-blocking ability, preventing water from penetrating the cable from all directions. Whether it is longitudinal or radial water penetration, it can be effectively contained, creating a relatively dry environment inside the cable and ensuring the stable performance of each component of the cable.

[0037] An aluminum strip shielding layer 7 is provided on the outer layer of the water-blocking layer 6;

[0038] It has a dual function: first, it serves as an electromagnetic shielding layer, further shielding against external electromagnetic interference, and together with the sub-shielding layer 5, it forms a robust electromagnetic protection system; second, the metallic properties of the aluminum strip itself enable it to prevent moisture intrusion to a certain extent, playing an auxiliary role in water blocking and enhancing the overall moisture resistance of the cable.

[0039] A drainage layer 8 is provided on the outer layer of the aluminum strip shielding layer 7;

[0040] When a small amount of moisture breaks through the previous layers of protection and enters the cable, the drainage grease can quickly absorb this moisture and use its own fluidity to guide the moisture to both ends of the cable or other designated drainage locations to be discharged, thus preventing moisture from accumulating inside the cable and preventing a series of problems caused by moisture accumulation, such as short circuits and corrosion.

[0041] The drainage layer 8 is provided with a polyvinyl chloride inner sheath layer 9 on its outer surface;

[0042] Internally, it protects the intricate structure already built inside the cable, preventing moisture, chemicals, and other substances from penetrating through the tiny gaps in the outer layer and damaging the internal components; externally, it provides a flat and stable base for the subsequent attachment of the armor layer 10, ensuring that the armor layer 10 can tightly and evenly wrap the cable.

[0043] The outer layer of the polyvinyl chloride inner sheath layer 9 is provided with an armor layer 10;

[0044] It greatly enhances the overall mechanical strength of the cable, enabling it to withstand external mechanical forces such as compression, tension, and impact during laying and use, protecting the internal structure of the cable from damage; at the same time, the metal armor layer 10 also has water-blocking and moisture-proof properties to a certain extent, providing additional protection for the cable.

[0045] The outer layer of the armor layer 10 is provided with an outer sheath layer 11;

[0046] As the outermost protective barrier of the cable, it resists various harsh environmental factors such as chemical corrosion, ultraviolet radiation, and humid climate. When the outer sheath 11 is slightly damaged, the self-healing polypropylene can automatically activate the repair mechanism to restore the integrity of the damaged part, ensuring the continuous effectiveness of the cable's protective performance and extending the cable's service life.

[0047] When this water-blocking and moisture-proof power cable is in operation, conductor 1 is responsible for transmitting electricity. Its tightly twisted structure, combined with water-blocking powder and yarn, initially prevents moisture from penetrating conductor 1. The cross-linked polyethylene inner insulation layer 2 and the ethylene propylene rubber outer insulation layer 4 provide electrical insulation for conductor 1, preventing leakage. The semi-conductive water-blocking tape wrapping layer 3 expands upon contact with water, preventing moisture from penetrating longitudinally along the cable. The sub-shielding layer 5, made of conductive plastic, shields against electromagnetic interference, ensuring stable power transmission. The multi-layered water-blocking tape of the water-blocking layer 6 further blocks moisture. The aluminum tape shielding layer 7 not only shields against electromagnetic interference but also assists in water blocking. The drainage grease in the drainage layer 8 absorbs and guides moisture out. The PVC inner sheath layer 9 protects the internal structure from moisture and other substances. The armor layer 10 enhances the cable's mechanical strength, preventing external damage. The outer sheath layer 11, made of self-healing polypropylene, not only resists external corrosion but also automatically repairs itself when damaged, comprehensively ensuring stable and safe power transmission in complex and humid environments.

[0048] like Figure 1 As shown, in some embodiments, the conductor 1 is tightly twisted, and water-blocking powder and water-blocking yarn are added during the twisting process. The tightly twisted conductor 1 structure can significantly reduce internal gaps, reducing the channels for water intrusion from a physical perspective. The water-blocking powder and water-blocking yarn will quickly take effect when they come into contact with water. The water-blocking powder expands when it comes into contact with water, filling the tiny gaps at the twisting points of the conductor 1 to form a dense physical barrier, preventing further water penetration. The water-blocking yarn, with its good water absorption and water conductivity, can absorb and guide water, preventing it from accumulating around the conductor 1.

[0049] like Figure 1 As shown, in some embodiments, the sub-shielding layer 5 is a conductive plastic, extruded onto the outer layer of the ethylene propylene rubber outer insulation layer 4; the presence of the sub-shielding layer 5 makes the electric field more evenly distributed, reduces the electric field burden on the ethylene propylene rubber outer insulation layer 4, extends the service life of the insulation layer, and improves the reliability of the cable.

[0050] like Figure 2 As shown, in some embodiments, the water-blocking layer 6 is a water-blocking strip, which is wound in multiple layers around the outer layer of the sub-shielding layer 5; the multiple layers of winding form a tight and continuous protective structure. Each layer of water-blocking strip overlaps and complements each other, reducing possible gaps and weak points, and greatly improving the water-blocking effect.

[0051] like Figure 2 As shown, in some embodiments, the drainage layer 8 is a drainage grease that fills the gaps inside the cable. The drainage grease has good fluidity and water absorption, which can effectively fill the tiny gaps between the structural layers inside the cable, ensuring that a relatively sealed space is formed inside the cable and preventing moisture from accumulating in the gaps.

[0052] like Figure 2 As shown, in some embodiments, the outer sheath layer 11 is self-healing polypropylene; self-healing polypropylene itself has good weather resistance and can effectively resist the erosion of ultraviolet rays, high and low temperature changes and humid environments.

[0053] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water-blocking and moisture-proof power cable, comprising a copper or aluminum conductor (1), characterized in that: The conductor (1) is copper or aluminum. The conductor (1) is provided with a cross-linked polyethylene inner insulation layer (2). The outer layer of the cross-linked polyethylene inner insulation layer (2) is covered with a semi-conductive water-resistant tape wrapping layer (3). The outer layer of the semi-conductive water-resistant tape wrapping layer (3) is provided with an ethylene propylene rubber outer insulation layer (4). The outer layer of the ethylene propylene rubber outer insulation layer (4) is provided with a sub-phase shielding layer (5). The outer layer of the sub-phase shielding layer (5) is provided with a water-blocking layer (6). The outer layer of the water-blocking layer (6) is provided with an aluminum strip shielding layer (7). The outer layer of the aluminum strip shielding layer (7) is provided with a drainage layer (8). The drainage layer (8) is provided with a polyvinyl chloride inner sheath layer (9). The outer layer of the polyvinyl chloride inner sheath layer (9) is provided with an armor layer (10). The outer layer of the armor layer (10) is provided with an outer sheath layer (11).

2. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: The conductor (1) is tightly twisted, and water-blocking powder and water-blocking yarn are added during the twisting process.

3. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: The sub-shielding layer (5) is a conductive plastic, extruded onto the outer layer of the ethylene propylene rubber outer insulation layer (4).

4. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: The water-blocking layer (6) is a water-blocking strip that is wrapped in multiple layers around the outer layer of the sub-shielding layer (5).

5. A water-blocking and moisture-proof power cable according to claim 1, characterized in that: The drainage layer (8) is a drainage grease that fills the gaps inside the cable.

6. A water-blocking and moisture-proof power cable according to claim 1, characterized in that: The outer sheath layer (11) is self-healing polypropylene.

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