High and low temperature resistant water-blocking power cable

Abstract

The utility model discloses a high and low temperature resistant water-blocking power cable, which belongs to the technical field of cables and comprises a plurality of wire cores, a shielding layer is wrapped outside the wire cores, an insulating layer is arranged outside the stranded wire cores to wrap the wire cores, and a filling layer is arranged between the wire cores and the insulating layer. An armor layer is arranged outside the insulating layer, and a sleeve layer is arranged outside the armor layer. According to the utility model, the filling layer adopts the water-blocking filling rope, and the outer side of the water-blocking filling rope is provided with the semi-conductive water-blocking tape, so that water can be ensured not to intrude into the inner side of the wire core. And the sheath layer adopts the stainless steel strip and has the characteristics of rust resistance and oxidation resistance, so that the structural stability of the steel strip can be ensured when the cable is used in water for a long time.

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 cable technology. Background Technology

[0002] Cables that can function normally underwater are collectively called water-blocking cables. When cables are laid underwater, they are frequently immersed in water or damp places. Water-blocking cables are required to have waterproof functionality. Typical water-blocking cables are oil-paper insulated cables, with cable oil filling the space between the insulation layer and the conductor, and a metal sheath on the outside of the insulation layer. They have good water resistance, but oil-paper insulated cables are subject to greater limitations due to drop height and are prone to oil leakage, thus their use has gradually decreased.

[0003] Another type of water-blocking power cable on the market uses ordinary PP filler material in its filling layer, which only serves to fill and saturate the cable, resulting in poor water-blocking ability. The wrapping layer on the cable is made of non-woven fabric, which only provides a fastening function. When the cable is immersed in water, the wrapping layer only secures the cable and is insufficient to provide water-blocking ability. The cable sheath layer uses low-smoke halogen-free material with a low elongation, only around 120%-150%, and the sheath layer is relatively hard, making it prone to cracking. Prolonged immersion in water can easily lead to a decline in material performance, easy decomposition, and corrosion of the sheath material, making it difficult to operate safely and stably in water for extended periods. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a water-resistant power cable that is resistant to high and low temperatures. This solves the problems of poor water-blocking performance, easy material decomposition, and easy material corrosion in water in water-blocking cables.

[0005] 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...

[0006] The wire cores, wherein multiple wire cores are fixed together by twisting.

[0007] Its features are:

[0008] The outer side of the wire core is wrapped with a shielding layer. After multiple wire cores are twisted together, an insulating layer is provided on the outer side to wrap the wire core. A filling layer is provided between the wire core and the insulating layer. An armor layer is provided on the outer side of the insulating layer. A sheath layer is provided on the outer side of the armor layer.

[0009] Preferably, the core is made of multiple conductors twisted together.

[0010] Preferably, the insulating layer is made of cross-linked TPE, and the cross-linked TPE has a material density of 0.95-1.05 and a hardness of 75-78A.

[0011] Preferably, the filling layer includes a water-blocking filling rope, and a semi-conductive water-blocking tape is provided on the outside of the water-blocking filling rope.

[0012] Preferably, the water-blocking filler rope is made of polyester fiber and is strip-shaped; the semi-conductive water-blocking tape includes polyester fiber and is strip-shaped.

[0013] Preferably, the armor layer comprises a stainless steel strip, and the semi-conductive resistive water strip is disposed on the outer side of the stainless steel strip.

[0014] Preferably, the sheath layer is made of polyethylene, and the polyethylene has a density of 0.88-0.95 and a hardness of 83-86A.

[0015] The beneficial effects of this utility model are:

[0016] (1) In this utility model, a shielding layer is provided on the outside of the wire core, multiple wire cores are fixed by twisting, and an insulation layer is provided on the surface of the twisted wire core; a filling layer is provided between the wire core and the insulation layer, an armor layer is provided on the outside of the insulation layer, and a sheath layer is provided on the outside of the armor layer. The filling layer is made of water-blocking filling rope, and a semi-conductive water-resistant tape is provided on the outside of the water-blocking filling rope. The water-blocking filling rope is made of polyester fiber, which has good water-blocking performance. When water passes through the insulation layer, the water-blocking filling rope and the semi-conductive water-resistant tape can ensure that water does not penetrate into the inside of the wire core. The sheath layer of the cable is made of stainless steel strip, and a semi-conductive water-resistant tape is provided on the outside of the stainless steel strip. The stainless steel strip has high strength, good bending resistance, is not easy to corrode, and is resistant to crushing. The armor layer of traditional cables on the market is usually magnetic steel strip. Compared with magnetic steel strip, stainless steel strip has the characteristics of not rusting and oxidizing, and can ensure the structural stability of the steel strip when used in water for a long time. A semi-conductive resistive water strip is installed on the outside of the stainless steel strip to prevent moisture from easily entering the inside of the cable. Contact with the stainless steel strip can affect its quality.

[0017] (2) In this invention, an insulating layer is provided on the surface of the stranded wire core, and a filler layer is provided between the wire core and the insulating layer. The insulating layer is made of cross-linked TPE with a temperature resistance rating of 105℃, a material density of 0.95~1.05, and a material hardness controlled at 75~78A. This type of polyethylene has a relatively soft hardness and better heat resistance than 70-degree polyvinyl chloride. The insulation volume resistivity is as high as 1*202Ω / cm, ensuring the insulation performance of the insulating layer.

[0018] (3) In this utility model, the outermost layer of the cable is a sheath layer, and the material of the sheath layer is polyethylene, specifically polyethylene material with a temperature resistance of -40℃ to +105℃, a material temperature resistance rating of 105℃, a material density of 0.88~0.95, and a material hardness controlled at 85A. This type of polyethylene has a relatively soft hardness and its heat resistance is better than that of 90-degree delay rate materials. Polyethylene material performs well in terms of stress crack resistance. This is mainly due to its low notch sensitivity, high shear strength, and excellent scratch resistance. In addition, the inner surface of this sheath layer is relatively smooth, with a water flow resistance of less than 2%. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] In the diagram: 1-core wire, 2-shielding layer, 3-filling layer, 4-semi-conductive resistive water tape, 5-insulation layer, 6-armor layer, 7-semi-conductive resistive water tape, 8-sheath layer. Detailed Implementation

[0021] 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.

[0022] Example 1

[0023] Reference Figure 1 A high and low temperature resistant water-blocking power cable includes a conductor core 1, with multiple conductor cores 1 fixed by twisting. A shielding layer is provided on the outside of the conductor core 1. In this embodiment, four conductor cores 1 are twisted together in contact with each other. The conductor core 1 is made of multiple conductors twisted together, and a shielding layer 2 is provided on the outside of the conductor core 1. The shielding layer 2 is made of cross-linked TPE material. The cross-linked TPE material has a temperature resistance rating of 105℃, a material density of 0.95-1.05, and a hardness of 75-78A. This type of cross-linked TPE material has a relatively soft hardness and better heat resistance compared to the commonly used 70℃ polyvinyl chloride material on the market. Furthermore, the production method has been changed from extrusion to mechanical extrusion. Compared with extrusion, the concentricity of the insulation can be controlled at over 95%, while the concentricity of extrusion is only around 85%. Therefore, the thickness of the insulation layer can be kept consistent, avoiding the cable exposure due to wear of the thinner insulation layer, which could lead to safety accidents.

[0024] During the fabrication of shielding layer 2, core 1 is preheated to 200-250℃ to ensure the plasticization of the cross-linked TPE and prevent loosening. The bending radius between core 1 and shielding layer 2 is 8D, providing good overall flexibility and facilitating underwater cabling. The insulation volume resistivity of shielding layer 2 is approximately 20%. 2 Ω / cm, ensuring stable operation of the cable.

[0025] In this embodiment, the four wire cores 1 are twisted together to form a whole, and an insulating layer 5 is provided on the surface of the whole of the four wire cores 1.

[0026] A filler layer 3 is provided between the core 1 and the insulation layer 5. The filler layer 3 is made of water-blocking filler rope, which is made of polyester fiber and is strip-shaped. The water-blocking filler rope has a water absorption capacity ≥50ml / g, tensile strength ≥60N / mm, elongation ≥20%, temperature resistance rating of 125℃, and moisture content ≤9%. Compared with the PP filler rope (moisture content ≤50%, ≥5N / mm) used in traditional water-blocking cables, the water-blocking filler rope has better tensile strength and lower moisture content.

[0027] A semi-conductive water-resistant tape 4 is provided on the outside of the water-blocking filling rope. The semi-conductive water-resistant tape 4 is made of polyester fiber and is strip-shaped. The semi-conductive water-resistant tape 4 wraps around the water-blocking filling rope and is placed in the gap between the core 1 and the insulation layer 5.

[0028] Semiconductor water-blocking tape 4 is made of polyester fiber, while traditional wrapping tape uses non-woven fabric and PP filler rope. Compared with traditional water-blocking cable wrapping tape, semiconductor water-blocking tape 4 has a moisture content of ≤9% (non-woven fabric moisture content ≤30%) and higher tensile strength than PP filler rope. It can effectively buffer and weaken the electric field strength, thereby effectively reducing the pressure of the cable in water and improving the safety of the cable when carrying large currents, ensuring stable operation.

[0029] Insulation layer 5 is also made of cross-linked TPE material, which has good performance.

[0030] An armor layer 6 is provided on the outside of the insulation layer 5. The armor layer 6 is made of stainless steel strip, while the armor layer of traditional water-blocking cables uses magnetic steel strip. Compared with magnetic steel strip, stainless steel strip has higher strength, better bending resistance, is not easy to corrode, and is resistant to crushing. Stainless steel strip does not rust or oxidize, and can ensure the structural stability of the steel strip when used in water for a long time.

[0031] A semi-conductive resistive water strip 7 is installed on the outside of the stainless steel strip to prevent moisture from easily entering the inside of the cable. The stainless steel strip and the semi-conductive resistive water strip 7 together form the armor layer 6.

[0032] An outer sheath layer 8 is provided on the outside of the armor layer 6. The sheath layer 8 is made of polyethylene with a temperature resistance rating of 105℃, a density of 0.88-0.95, and a hardness controlled at 85A. Compared with traditional cable sheath layers, it is softer and has better resistance to stress cracking.

[0033] During use, cables are often submerged in water or exposed to damp environments, necessitating waterproofing. Current water-blocking power cables suffer from poor water resistance, easily decomposed sheath materials, and short lifespans. By incorporating a sheath layer on the outermost layer of the cable, followed by an armor layer inside, the cable's water-blocking performance is ensured. The sheath layer, made of polyethylene, is resistant to cracking even after prolonged immersion in water. Semi-conductive water-resistant tape is installed outside the cable's filler and armor layers to protect against moisture penetration into the sheath layer, preventing further water from entering the cable. The armor layer uses stainless steel tape, which is resistant to decomposition, and even if moisture penetrates the cable, it is less likely to rust, thus maintaining the protective effect of the armor layer.

[0034] 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: The wire cores, wherein multiple wire cores are fixed together by twisting. Its features are: The outer side of the wire core is wrapped with a shielding layer, and after multiple wire cores are twisted together, an insulating layer is provided on the outside of the wire core to wrap the wire core. A filling layer is provided between the wire core and the insulating layer. An armor layer is provided on the outside of the insulating layer, and a sheath layer is provided on the outside of the armor layer. The filling layer includes a water-blocking filling rope, and a semi-conductive water-blocking tape is provided on the outside of the water-blocking filling rope. The armor layer includes a stainless steel strip, and the semi-conductive resistive water strip is disposed on the outside of the stainless steel strip.

2. The high and low temperature resistant water-blocking power cable according to claim 1, characterized in that: The core is made of multiple conductors twisted together.

3. The high and low temperature resistant water-blocking power cable according to claim 1, characterized in that: The insulating layer is made of cross-linked TPE, and the material density of the cross-linked TPE is 0.95-1.05, and the hardness is 75-78A.

4. The high and low temperature resistant water-blocking power cable according to claim 1, characterized in that: The water-blocking filler rope is made of polyester fiber and is strip-shaped; the semi-conductive water-blocking tape is made of polyester fiber and is strip-shaped.

5. A water-resistant power cable resistant to high and low temperatures according to claim 1, characterized in that: The sheath layer is made of polyethylene, and the polyethylene has a density of 0.88-0.95 and a hardness of 83-86A.

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