Water-blocking power cable

Abstract

The utility model discloses a water-blocking power cable, and relates to the technical field of power cables. The waterproof power cable comprises a power cable main body, the power cable main body comprises a conductor layer, the outer surface of the conductor layer is fixedly connected with an inner insulating layer, the outer surface of the inner insulating layer is fixedly connected with a waterproof enhancement layer, and the outer surface of the waterproof enhancement layer is fixedly connected with a functional layer. According to the utility model, a strong waterproof barrier is provided through the double-layer water-blocking design, the high-temperature-resistant water-blocking mica tape of the first water-blocking layer can initially and efficiently block moisture permeation by virtue of a compact structure formed by overlapping and wrapping, the mica component expands when encountering water and further strengthens the water-blocking effect, and the polypropylene water-blocking tape of the second water-blocking layer further enhances the water-blocking effect when encountering water. Due to the high water absorption, residual water penetrating through the first water-blocking layer can be rapidly absorbed, the first water-blocking layer and the second water-blocking layer expand into gel to block a channel, the problem that a traditional single-layer water-blocking material is prone to failure is solved through cooperation of the two materials, and the reliability of the cable in a humid environment is greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of power cable technology, and in particular relates to water-blocking power cables. Background Technology

[0002] With the increasing demands for stability and reliability in power supply in modern society, the performance of power cables, as a key carrier of power transmission, has received considerable attention. In many complex operating environments, humid and wet conditions pose severe challenges to power cables. Under such conditions, the insulation performance of traditional power cables deteriorates sharply. Once the insulation layer becomes damp, its resistance drops significantly, failing to effectively prevent current leakage and leading to short-circuit faults, seriously threatening the normal operation of the power system.

[0003] Existing power cables have several drawbacks. While they offer some water resistance, they typically use a single layer of water-blocking material, which is prone to deterioration or damage over time. This makes them susceptible to water ingress and subsequent malfunctions. Furthermore, their insulation and flame-retardant properties are often inadequate, failing to meet current market demands. Therefore, we offer water-blocking power cables to address these issues. Utility Model Content

[0004] The purpose of this invention is to provide a water-blocking power cable, which solves the problem of poor water blocking, insulation and flame retardant effects of existing power cables by combining an inner insulation layer, a water-blocking reinforcement layer and a functional layer.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0006] This utility model relates to a water-blocking power cable, comprising a power cable body, the power cable body including a conductor layer, an inner insulation layer fixedly connected to the outer surface of the conductor layer, a water-blocking reinforcement layer fixedly connected to the outer surface of the inner insulation layer, and a functional layer fixedly connected to the outer surface of the water-blocking reinforcement layer; the water-blocking reinforcement layer includes a first water-blocking layer and a second water-blocking layer, the second water-blocking layer being fixed to the outer surface of the first water-blocking layer; the functional layer includes an outer insulation layer, a wrapping layer fixedly connected to the outer surface of the outer insulation layer, and a reinforcing layer fixedly connected to the outer surface of the wrapping layer. A flame-retardant layer is fixedly connected to the outer surface of the layer, and an outer sheath is fixedly connected to the outer surface of the flame-retardant layer. By setting a conductor layer, an inner insulation layer, a water-blocking reinforcement layer, and a functional layer, the layers work together to fundamentally solve the problems of water blocking, insulation, and protection in traditional cables. Among them, the double-layer water-blocking reinforcement layer breaks through the limitations of traditional single-layer water-blocking materials and greatly improves the water blocking capability. The combination of multiple sub-layers in the functional layer, from insulation, shielding, reinforcement, flame retardancy to protection, comprehensively meets the requirements of cable performance in complex environments, and provides a guarantee for the long-term stable operation of power cables under harsh conditions.

[0007] The present invention is further configured such that the conductor layer is composed of multiple strands of metal wire twisted together, and the inner insulation layer is made of cross-linked polyethylene material. The conductor layer composed of multiple strands of metal wire twisted together ensures good conductivity and flexibility, which is beneficial for power transmission and cable laying and installation. The inner insulation layer is made of cross-linked polyethylene material, which has excellent electrical insulation performance and can effectively isolate the conductor from the outside world and prevent current leakage.

[0008] The present invention is further configured such that the first water-blocking layer is formed by overlapping and wrapping multiple layers of high-temperature resistant water-blocking mica tape, and the second water-blocking layer is formed by overlapping and wrapping polypropylene water-blocking tape. The first water-blocking layer is formed by overlapping and wrapping multiple layers of high-temperature resistant water-blocking mica tape. By utilizing the high-temperature resistance of mica tape and the dense structure formed by overlapping and wrapping, it effectively blocks water penetration. Moreover, the mica component expands when it comes into contact with water, further filling the gaps and enhancing the water-blocking effect. The second water-blocking layer uses polypropylene water-blocking tape, whose high water absorption can quickly absorb the small amount of water that has passed through the first water-blocking layer and expand into a gel to block the channel. The double-layer water-blocking structure works together to significantly improve the overall water-blocking performance of the cable.

[0009] The present invention is further configured such that the outer insulation layer is made of low-smoke halogen-free polyvinyl chloride material, and the wrapping layer is an aluminum strip with gap wrapping.

[0010] The present invention is further configured such that the reinforcing layer is woven from stainless steel wire, the flame-retardant layer is made of flame-retardant polyolefin composite material, and the outer protective layer is made of chloroprene rubber material.

[0011] The present invention is further configured such that the overlap rate of the first water-blocking layer and the second water-blocking layer is ≥20%, the thickness of a single layer is 0.05-0.15mm, and the wrapping tension is controlled at 5-15N. The appropriate overlap rate ensures that the water-blocking material has no gaps and effectively blocks water. The appropriate single layer thickness ensures the water-blocking effect without excessively increasing the cost. The reasonable wrapping tension makes the water-blocking tape fit tightly against the cable, further optimizing the water-blocking performance and ensuring that the water-blocking effect is stable and reliable during long-term use, avoiding the decline in water-blocking capacity due to improper process.

[0012] The present invention is further configured such that the thickness of the wrapping layer is 0.1-0.3mm and the wrapping gap ratio is 20-40%. The appropriate thickness ensures that the aluminum strip can effectively play a shielding and protective role, and the gap ratio is controlled within a certain range, which not only ensures the shielding effect but also avoids excessive cost and heat dissipation problems caused by complete wrapping, thus achieving a balance between function and cost.

[0013] The present invention is further configured such that the braiding density of the reinforcing layer is ≥85%, and the diameter of the single filament is 0.3-0.8mm. The appropriate single filament diameter ensures both strength and flexibility, making the cable less susceptible to damage when subjected to external forces and adaptable to different laying environments, thereby improving the overall mechanical performance of the cable.

[0014] The present invention has the following beneficial effects.

[0015] 1. This utility model provides a strong waterproof barrier through a double-layer water-blocking design. The first water-blocking layer is a high-temperature resistant water-blocking mica tape. With its dense structure formed by overlapping wrapping, it can effectively block water penetration from the outset. The expansion of the mica component when it comes into contact with water further enhances the water-blocking effect. The second water-blocking layer is a polypropylene water-blocking tape. Its high water absorption allows it to quickly absorb the residual water that has penetrated through the first water-blocking layer, expand into a gel, and block the channel. The two work together to solve the problem of easy failure of traditional single-layer water-blocking materials, greatly improve the reliability of the cable in humid environments, and ensure long-term stable operation.

[0016] 2. The cross-linked polyethylene material of the inner insulation layer of this utility model effectively isolates the conductor from the outside world with excellent electrical insulation performance, prevents current leakage, and ensures the safety of power transmission. The outer insulation layer is made of low-smoke halogen-free polyvinyl chloride material, which not only further enhances the insulation performance, but also reduces the generation of smoke and toxic gases in the event of a fire due to its low-smoke halogen-free characteristics, greatly improving the public safety factor and fully meeting the stringent requirements for cable insulation and safety in complex environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a 3D view of a water-blocking power cable.

[0019] Figure 2 This is a cross-sectional view of the main body of a water-blocking power cable.

[0020] Figure 3 This is a schematic diagram of the composition of the water-blocking reinforcement layer material in a water-blocking power cable.

[0021] Figure 4 This is a schematic diagram of the material composition of the functional layer in a water-blocking power cable.

[0022] In the attached diagram: 1. Main body of the power cable; 2. Conductor layer; 3. Inner insulation layer; 4. Water-blocking reinforcement layer; 5. Functional layer; 401. First water-blocking layer; 402. Second water-blocking layer; 501. Outer insulation layer; 502. Wrapping layer; 503. Reinforcing layer; 504. Flame-retardant layer; 505. Outer sheath. Detailed Implementation

[0023] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1

[0025] Please see Figure 1-4 This utility model is a water-blocking power cable, including a power cable body 1. The power cable body 1 includes a conductor layer 2. An inner insulation layer 3 is fixedly connected to the outer surface of the conductor layer 2. A water-blocking reinforcing layer 4 is fixedly connected to the outer surface of the inner insulation layer 3. A functional layer 5 is fixedly connected to the outer surface of the water-blocking reinforcing layer 4. The water-blocking reinforcing layer 4 includes a first water-blocking layer 401 and a second water-blocking layer 402. The second water-blocking layer 402 is fixed to the outer surface of the first water-blocking layer 401. The functional layer 5 includes an outer insulation layer 501. A wrapping layer 502 is fixedly connected to the outer surface of the outer insulation layer 501. A reinforcing layer 503 is fixedly connected to the outer surface of the wrapping layer 502. A flame-retardant layer 504 is fixedly connected to the outer surface of the reinforcing layer 503. An outer sheath 505 is fixedly connected to the outer surface of the flame-retardant layer 504.

[0026] Specifically, by setting up conductor layer 2, inner insulation layer 3, water-blocking reinforcement layer 4, and functional layer 5, the layers work together to fundamentally solve the problems of water blocking, insulation, and protection in traditional cables. Among them, the double-layer water-blocking reinforcement layer 4 breaks through the limitations of traditional single-layer water-blocking materials and greatly improves water blocking capability. The combination of multiple sub-layers in functional layer 5, from insulation, shielding, reinforcement, flame retardancy to protection, comprehensively meets the requirements of cable performance in complex environments, and provides a guarantee for the long-term stable operation of power cables under harsh conditions.

[0027] Example 2

[0028] Please see Figure 1-4 Based on Example 1, the conductor layer 2 is composed of multiple strands of metal wire twisted together, the inner insulation layer 3 is made of cross-linked polyethylene material, the first water-blocking layer 401 is formed by overlapping and wrapping multiple layers of high-temperature resistant water-blocking mica tape, the second water-blocking layer 402 is formed by overlapping and wrapping polypropylene water-blocking tape, the outer insulation layer 501 is made of low-smoke halogen-free polyvinyl chloride material, the wrapping layer 502 is an aluminum tape with gap wrapping, the reinforcing layer 503 is woven from stainless steel wire, the flame-retardant layer 504 is made of flame-retardant polyolefin composite material, and the outer protective layer 505 is made of neoprene rubber material. The overlap rate of the first water-blocking layer 401 and the second water-blocking layer 402 is ≥20%, the thickness of a single layer is 0.05-0.15mm, the wrapping tension is controlled at 5-15N, the thickness of the wrapping layer 502 is 0.1-0.3mm, the wrapping gap rate is 20-40%, the weaving density of the reinforcing layer 503 is ≥85%, and the diameter of a single filament is 0.3-0.8mm.

[0029] Specifically: The conductor layer 2 is composed of multiple strands of metal wire twisted together, ensuring good conductivity and flexibility, which is beneficial for power transmission and cable laying and installation. The inner insulation layer 3 is made of cross-linked polyethylene material, which has excellent electrical insulation properties and can effectively isolate the conductor from the outside environment, preventing current leakage. The first water-blocking layer 401 is composed of multiple layers of high-temperature resistant water-blocking mica tape wrapped together. Utilizing the high-temperature resistance of the mica tape and the dense structure formed by the overlapping wrapping, it effectively blocks water penetration. Furthermore, the mica component expands upon contact with water, further filling the gaps and enhancing the water-blocking effect. The second water-blocking layer 402 uses polypropylene water-blocking tape, whose high water absorption can quickly absorb water penetration. The first water-blocking layer 401 absorbs a small amount of moisture, which swells into a gel to block the channels. The double-layer water-blocking structure works synergistically to significantly improve the overall water-blocking performance of the cable. The outer insulation layer 501 uses low-smoke halogen-free polyvinyl chloride material, which not only enhances the cable's insulation performance but also reduces the generation of smoke and toxic gases in the event of a fire, improving public safety. The wrapping layer 502 is an aluminum strip with gap wrapping. The aluminum strip's good conductivity and shielding performance can shield the electromagnetic interference of the cable's internal current to the outside world and block the influence of external electromagnetic interference on the internal signal transmission of the cable. At the same time, it provides a certain degree of mechanical protection for the internal structure. The reinforcing layer 503 is made of non- Braided from stainless steel wire, the high-strength and tough stainless steel wire braiding structure significantly improves the cable's mechanical strength, preventing damage from external forces during laying and use, and protecting the integrity of the internal insulation and water-blocking structure. The flame-retardant layer 504 uses flame-retardant polyolefin composite material, which can play a flame-retardant role when the ambient temperature rises or when exposed to open flame, reducing the risk of fire. The outer sheath 505 uses neoprene rubber material, which has good weather resistance, water resistance, chemical corrosion resistance, and certain flame retardancy, allowing for long-term outdoor use without being corroded by the natural environment. The appropriate overlap ratio ensures that the water-blocking material has no gaps, effectively blocking moisture; the appropriate single-layer thickness... To ensure water-blocking effectiveness without excessively increasing costs, reasonable wrapping tension ensures the water-blocking tape fits tightly to the cable, further optimizing water-blocking performance and guaranteeing stable and reliable water-blocking effect during long-term use. This avoids a decrease in water-blocking capacity due to improper processes. Appropriate thickness ensures that the aluminum tape can effectively perform its shielding and protection functions. The gap ratio is controlled within a certain range, ensuring shielding effectiveness while avoiding excessive costs and heat dissipation problems caused by complete wrapping, thus achieving a balance between function and cost. The appropriate single-wire diameter ensures both strength and flexibility, making the cable less susceptible to damage when subjected to external forces and adaptable to different laying environments, thereby improving the overall mechanical performance of the cable.

[0030] The working principle of this invention is as follows: The mica tape of the first water-blocking layer 401 has good high-temperature resistance, and the dense structure formed by overlapping wrapping can effectively block water penetration. When water comes into contact with the first water-blocking layer 401, the mica component in the mica tape can absorb a certain amount of water and expand, further filling the gaps and preventing further water intrusion. The second water-blocking layer 402, on the outer surface of the first water-blocking layer 401, is formed by overlapping and wrapping polypropylene water-blocking tape, which also meets the process requirements such as overlap rate. The polypropylene water-blocking tape has high water absorption and can quickly absorb the small amount of water passing through the first water-blocking layer 401. Moisture expands and forms a gel-like substance, blocking moisture channels. Together with the first water-blocking layer 401, it forms a double water-blocking barrier, greatly improving the overall water-blocking ability of the cable. The inner insulation layer 3 is made of cross-linked polyethylene material and fixed to the outer surface of the conductor layer 2. Cross-linked polyethylene has good electrical insulation properties, which can effectively isolate the conductor from the outside world, prevent current leakage, and ensure the safety of power transmission. The outer insulation layer 501 is made of low-smoke halogen-free polyvinyl chloride material, which further enhances the insulation performance of the cable. At the same time, in the event of a fire, the low-smoke halogen-free characteristics can reduce the generation of smoke and toxic gases, improving safety.

[0031] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to the specific implementation methods described. The present specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the art can better understand and utilize the present utility model.

Claims

1. A water-blocking power cable comprising a power cable body (1), characterized in that: The power cable body (1) comprises a conductor layer (2), an outer surface of the conductor layer (2) is fixedly connected with an inner insulation layer (3), an outer surface of the inner insulation layer (3) is fixedly connected with a water-blocking reinforcing layer (4), and an outer surface of the water-blocking reinforcing layer (4) is fixedly connected with a functional layer (5). The water-blocking reinforcing layer (4) comprises a first water-blocking layer (401) and a second water-blocking layer (402), and the second water-blocking layer (402) is fixed to an outer surface of the first water-blocking layer (401). The functional layer (5) comprises an outer insulation layer (501), an outer surface of the outer insulation layer (501) is fixedly connected with a wrapping layer (502), an outer surface of the wrapping layer (502) is fixedly connected with a reinforcing layer (503), an outer surface of the reinforcing layer (503) is fixedly connected with a flame-retardant layer (504), and an outer surface of the flame-retardant layer (504) is fixedly connected with an outer protective layer (505).

2. A water-blocking power cable according to claim 1, characterized in that: The conductor layer (2) is composed of a plurality of metal strands, and the inner insulation layer (3) is made of cross-linked polyethylene material.

3. A water-blocking power cable according to claim 1, characterized in that: The first water-blocking layer (401) is formed by overlapping and wrapping a plurality of high-temperature-resistant water-blocking mica tapes, and the second water-blocking layer (402) is formed by overlapping and wrapping a polypropylene water-blocking tape.

4. A water-blocking power cable according to claim 1, characterized in that: The outer insulation layer (501) is made of low-smoke halogen-free polyvinyl chloride material, and the wrapping layer (502) is an aluminum tape wrapped with gaps.

5. A water-blocking power cable according to claim 1, characterized in that: The reinforcing layer (503) is woven by stainless steel wire, the flame-retardant layer (504) is made of flame-retardant polyolefin composite material, and the outer protective layer (505) is made of chloroprene rubber material.

6. A water-blocking power cable according to claim 1, characterized in that: The overlapping rate of the first water-blocking layer (401) and the second water-blocking layer (402) is greater than or equal to 20%, the thickness of a single layer is 0.05-0.15 mm, and the wrapping tension is controlled to be 5-15 N.

7. A water-blocking power cable according to claim 1, characterized in that: The thickness of the wrapping layer (502) is 0.1-0.3 mm, and the wrapping gap rate is 20-40%.

8. A water-blocking power cable according to claim 1, characterized in that: The weaving density of the reinforcing layer (503) is greater than or equal to 85%, and the diameter of a single wire is 0.3-0.8 mm.

Images