High and low temperature resistant water-blocking power cable

Abstract

This utility model discloses a water-resistant power cable resistant to high and low temperatures, belonging to the field of power cable technology. It includes a conductor, an insulation layer, and an insulation layer disposed on the outside of the conductor. The conductors are multiple aluminum alloy conductors that have undergone oxidation treatment and have an elongation of 25%-35%. The insulation layer is made of cross-linked TPE. The multiple conductors are connected by twisting, and the insulation layers of adjacent conductors are bonded together. A filler layer is disposed between the conductors, and multiple wrapping tapes are disposed within the filler layer. An inner sheath is disposed outside the filler layer, an armor layer is disposed outside the inner sheath, a second wrapping tape is disposed outside the armor layer, and an outer sheath is disposed outside the second wrapping tape. Through this utility model, the presence of wrapping tapes within the filler layer and the filler layer between adjacent conductors can prevent water from migrating longitudinally along the conductors inside the cable, significantly reducing the speed and total amount of water intrusion into the cable.

Description

Technical Field

[0001] This utility model relates to a water-resistant power cable that is resistant to high and low temperatures, belonging to the field of power cable technology. Background Technology

[0002] In environments where underwater cables are required, waterproof cables must be used to meet operational requirements, preventing water from entering the cable and causing damage, and ensuring long-term underwater operation. Some cables also need to be installed in seawater environments to withstand seawater corrosion, thus requiring high stability.

[0003] Currently, commonly used power cables employ a structure consisting of a metallic conductor, polymer insulation, sheath material, and filler layers. The typical structure comprises multiple layers: conductor, insulation, filler, inner sheath, armor, and outer sheath. The filler typically uses ordinary PP filler or non-woven fabric tape to fill the gaps in the cable core. The armor usually uses steel tape to improve mechanical strength, and the sheath uses conventional low-smoke halogen-free or polyethylene materials for waterproofing, abrasion resistance, and weather resistance. However, in existing technologies, during long-term underwater operation, the filler and tape materials, often using ordinary PP filler or non-woven fabric tape, do not possess true water-blocking capabilities, easily leading to moisture migration along the intercore channels. The insulation or sheath is prone to localized weak points, electric field concentration, aging, or breakdown. Some sheath materials experience performance degradation, cracking, or decomposition under long-term immersion in water and salt spray environments, shortening cable life. The armor layer is also susceptible to corrosion.

[0004] Therefore, it is necessary to design a water-resistant power cable that can withstand high and low temperatures to solve the problems of poor water-blocking ability of the filling layer of traditional cables, easy aging or breakdown of electric field at local weak points in insulation or sheath, and easy corrosion of armor layer. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a lightweight aluminum alloy cable, which solves the problems of poor water resistance of the filling layer of traditional cables, easy aging or breakdown of electric field at local weak points in insulation or sheath, and easy corrosion of armor layer.

[0006] The technical problem to be solved by this utility model is achieved by the following technical solution: a high and low temperature resistant water-blocking power cable, comprising...

[0007] Conductor, Insulating layer,

[0008] The conductor is provided with an insulating layer on its outer side.

[0009] The conductors are made of multiple aluminum alloy conductors that have undergone oxidation treatment and have an elongation of 25%-35%; the insulation layer is made of cross-linked TPE, and the multiple conductors are connected by twisting. The insulation layers of adjacent conductors are bonded to each other, and a filler layer is provided between the conductors. Multiple wrapping tapes are provided inside the filler layer, an inner sheath is provided outside the filler layer, an armor layer is provided outside the inner sheath, a wrapping tape is provided outside the armor layer, and an outer sheath is provided outside the wrapping tape.

[0010] Preferably, the number of conductors is four, and the wrapping tape is disposed at the outer gap of adjacent conductors.

[0011] Preferably, the first wrapping tape is a semi-conductive resistive water tape.

[0012] Preferably, the inner sheath is made of polyethylene.

[0013] Preferably, the armor layer is made of stainless steel strip.

[0014] Preferably, the second wrapping tape is a semi-conductive resistive water tape.

[0015] Preferably, the outer sheath is made of polyethylene, and the temperature resistance range of the outer sheath is -40~+105℃.

[0016] The beneficial effects of this utility model are:

[0017] This invention provides a wrapping tape within the filler layer and a filler layer between adjacent conductors. This can block water from migrating longitudinally along the conductors inside the cable and significantly reduce the speed and total amount of water intrusion into the cable. It prevents water from spreading along the cable interior, causing localized dampness and insulation degradation, improves the geometric stability and bending fatigue resistance of the filler layer, and enhances the support and compressive strength during installation.

[0018] This invention utilizes cross-linked TPE for the insulation layer, which is extruded onto the cable surface to ensure high concentricity. This reduces the defects caused by localized weak points in the cable, leading to electric field concentration and localized breakdown. Furthermore, cross-linked TPE replaces traditional PVC. The inner and outer sheaths are made of polyethylene, extruded together. The inner sheath isolates the armor layer from the filler layer, reducing direct pressure and friction between the armor layer and the filler layer; it also improves temperature resistance and stress cracking resistance. The outer sheath, which is submerged in water for extended periods, has an operating temperature range of -40℃ to +105℃, reducing premature failure caused by temperature changes or environmental corrosion.

[0019] This invention utilizes stainless steel strips as the armor layer, which are constructed through overlapping and wrapping. The stainless steel strips replace traditional, easily rusting magnetic steel strips, solving the problems of rusting, corrosion, and decreased mechanical strength in water associated with traditional armor layers. Furthermore, it can buffer the electric field when the outer layer potential changes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 1-Conductor, 2-Insulation layer, 3-Filling layer, 4-Wrapping tape one, 5-Inner sheath, 6-Armor layer, 7-Wrapping tape two, 8-Outer sheath. Detailed Implementation

[0022] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments. Example 1

[0023] like Figure 1 As shown, a water-resistant power cable with high and low temperatures includes a conductor 1 and an insulation layer 2, with the insulation layer 2 disposed on the outside of the conductor 1.

[0024] Each conductor 1 is a circular cross-section conductor formed by twisting multiple thin wires together, using a layered twisting structure. Multiple conductors 1 are installed in the cable; in this embodiment, four conductors 1 are installed in the cable, arranged symmetrically in a quadrilateral shape.

[0025] Conductor 1 is made of aluminum alloy and undergoes surface anti-oxidation treatment to improve its corrosion resistance, thereby enhancing its oxidation resistance under water-resistant conditions. After processing, conductor 1 has an elongation of 25%-35%. Conductor 1 is capable of conducting current, withstanding tensile forces and bending, and possesses good conductivity, flexibility, and oxidation resistance.

[0026] An insulating layer 2 is provided on the outside of conductor 1. Insulating layer 2 is a concentric cylindrical insulating layer uniformly covering the outer axis of conductor 1. The insulating layers 2 of adjacent conductors 1 are bonded together to form a multi-core cable structure. The insulating layer is made of cross-linked TPE, with a temperature resistance rating of 105℃, a material density of 0.95-1.05 g / cm³, and a hardness of 75-78A. In this embodiment, the concentricity of the insulating layer 2 is ≥95%. The insulating layer 2 provides electrical insulation, high temperature resistance, cushioning, and adhesion of filler materials, reducing local electric field distortion. The insulating layer 2 is disposed on the outside of conductor 1 using an extrusion method.

[0027] A filler layer 3 is provided in the gap between adjacent insulation layers 2, filling the irregular spaces between them. The filler layer 3 uses water-resistant filler rope with a water absorption capacity ≥50ml / g, tensile strength ≥60MPa, elongation ≥20%, moisture content ≤9%, and temperature resistance ≥125℃. The filler layer 3 can prevent moisture from diffusing between the conductors and also maintain the overall geometric stability and bending resistance of the cable.

[0028] Reference Figure 1 The filler layer 3 also contains multiple wrapping tapes 4. Each wrapping tape 4 is a strip-shaped material, spirally arranged along the cable's axis on the outside of the filler and insulation layers. The wrapping tapes 4 are made of semi-conductive water-resistant tape with a moisture content ≤9% and a tensile strength ≥40MPa. This semi-conductive water-resistant tape possesses semi-conductive properties, effectively buffering and weakening the electric field strength, thereby effectively reducing the pressure on the cable in water and improving the cable's safety and stable operation under high current conditions.

[0029] The wrapping tape 4 is disposed inside the fill layer 3, specifically located on both sides of the adjacent conductor 1.

[0030] An inner sheath 5 is provided on the outside of the filler layer 3. The inner sheath 5 is provided on the outside of the filler layer 3 by extrusion and has a uniform thickness. The inner sheath 5 is made of polyethylene material with a temperature resistance rating of 105℃, a density of 0.88-0.95g / cm³, and a thickness of 0.5-3.0mm.

[0031] An armor layer 6 is provided on the outer side of the inner sheath 5. The inner sheath 5 can isolate the direct friction between the armor layer 6 and the filler layer 3, and play a role in mechanical buffering, heat resistance and crack resistance. It also serves as the inner lining of the armor layer 6 to protect the internal structure of the cable.

[0032] The armor layer 6 is made of stainless steel strip, which is spirally wrapped along the cable axis. The steel strip can be installed on the surface of the sheath 5 in an overlapping manner to ensure continuity or staggered arrangement to achieve the required mechanical strength. The armor layer 6 provides high strength resistance to compression, tension and crushing; corrosion resistance; and can withstand external mechanical impact or compressive loads during laying.

[0033] A second wrapping tape 7 is provided on the outer side of the armor layer 6, and the second wrapping tape 7 is spirally wrapped around the outer side of the armor layer 6. The second wrapping tape 7 is in contact with the armor layer 6. The second wrapping tape 7 is made of semi-conductive resistive water tape with a moisture content ≤9% and a tensile strength ≥40 N / mm. The second wrapping tape 7 can further homogenize the external electric field and act as a water-blocking isolation layer, reducing the risk of water seepage from the damaged location of the outer sheath into the inner side of the armor and electrochemical corrosion.

[0034] An outer sheath 8 is provided on the outside of the second wrapping tape 7. The outer sheath 8 is the outermost layer structure of the cable. The outer sheath 8 is applied by continuous extrusion to uniformly cover the entire outer surface of the cable. The outer sheath 8 is made of polyethylene material and can operate in temperatures ranging from -40℃ to +105℃; its thickness is 2-8mm. The outer sheath 8 provides external protection against water, corrosion, abrasion, and UV aging, reducing water flow resistance and withstanding long-term corrosion from the external environment.

[0035] In this embodiment, an insulating layer 2 is provided on the outer side of the conductor 1, and the insulating layer 2 is tightly fitted to the conductor 1 to prevent the insulation from loosening. Four conductors 1 are provided inside the cable, and the insulating layers 2 of adjacent conductors 1 are fitted together to form the basic structure of a multi-core cable.

[0036] The gaps between adjacent insulating layers 2 are filled by a filling layer 3, and an inner sheath 5 is provided on the outside of the filling layer 3. A wrapping tape 4 is disposed within the filling layer 3, located in the gap between adjacent conductors 1. The inner sheath 5 is formed by extrusion on the outside of the filling layer 3, creating a continuous inner sheath 5.

[0037] The armor layer 6 wraps around the outside of the inner sheath 5. The armor layer 5 is installed using an overlapping method 1 to ensure the mechanical strength of the armor layer 6 and facilitate the coverage of the second wrapping strap 7 and the outer sheath 8. The second wrapping strap 7 covers the outside of the armor layer 6.

[0038] Four conductors 1 are used, and an insulation layer 2 is set on the outside of the conductors 1. Adjacent conductors 1 are bonded to each other, and the remaining layers are as concentric as possible in the cross-section, so the overall cross-section of the cable is approximately circular.

[0039] A filler layer 3 is placed in the gaps between the conductors 1 to prevent water from spreading longitudinally within the cable. The wrapping tape 4 and wrapping tape 7 significantly reduce the rate at which water enters the cable. The armor layer 6 provides significant resistance to external forces, allowing the cable to be laid underwater. The inner sheath 5 and outer sheath 8 are made of polyethylene, offering a wide operating range and good resistance to stress cracking and impact. In this embodiment, the cable's bending radius reaches 8D.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A water-resistant power cable resistant to high and low temperatures, comprising: Conductor, Insulating layer, The conductor is provided with an insulating layer on its outer side. Its features are: The conductors are made of multiple aluminum alloy conductors that have undergone oxidation treatment and have an elongation of 25%-35%; the insulation layer is made of cross-linked TPE, and the multiple conductors are connected by twisting. The insulation layers of adjacent conductors are bonded to each other, and a filler layer is provided between the conductors. Multiple wrapping tapes are provided inside the filler layer, an inner sheath is provided outside the filler layer, an armor layer is provided outside the inner sheath, a second wrapping tape is provided outside the armor layer, and an outer sheath is provided outside the second wrapping tape.

2. The high and low temperature resistant water-blocking power cable according to claim 1, characterized in that: The number of conductors is four, and the wrapping tape is placed at the outer gap of adjacent conductors.

3. The high and low temperature resistant water-blocking power cable according to claim 1, characterized in that: The first type of tape is a semi-conductive resistive water tape.

4. The high and low temperature resistant water-blocking power cable according to claim 1, characterized in that: The inner sheath is made of polyethylene.

5. A water-resistant power cable resistant to high and low temperatures according to claim 1, characterized in that: The armor layer is made of stainless steel strip.

6. A water-resistant power cable resistant to high and low temperatures according to claim 1, characterized in that: The second type of tape is a semi-conductive resistive water tape.

7. A water-resistant power cable resistant to high and low temperatures according to claim 1, characterized in that: The outer sheath is made of polyethylene, and the temperature resistance range of the outer sheath is -40~+105℃.

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