Medium voltage mineral filled abrasion resistant cable

Abstract

The utility model relates to the technical field of power cable, and disclose a kind of medium voltage mineral wear-resistant cable, including conductor, the outside of conductor is sequentially covered with inner insulation layer, inner shielding layer, metal isolation layer, armoring layer and outer insulation layer from inside to outside, cable each layer junction is filled with sealing layer, the conductor surface is plated nickel-phosphorus alloy, the inner insulation layer is composed of high-purity magnesium oxide inner layer and polytetrafluoroethylene film outer layer, the inner shielding layer is semiconductive polyvinylidene fluoride strip, the metal isolation layer is seamless titanium alloy pipe.This medium voltage mineral wear-resistant cable, by setting composite inner insulation layer and silicone rubber sealing layer, the composite inner insulation layer of high-purity magnesium oxide and polytetrafluoroethylene film, combine high temperature resistance and chemical corrosion resistance advantage, ensure that insulation performance is stable, silicone rubber sealing layer fills each layer junction, form continuous sealing structure, prevent corrosive gas, liquid seep into cable interior, compared with traditional cable, insulation reliability is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically to a medium-voltage mineral wear-resistant cable. Background Technology

[0002] Medium-voltage mineral cables, as a new type of technology carrier in the field of power transmission, typically have a rated voltage in the range of 1kV to 35kV and are designed specifically for power transmission at medium voltage levels.

[0003] The existing patent document CN222545994U provides a medium-voltage fire-resistant cable. The mineral fire-resistant layer does not require high-temperature vulcanization, avoiding damage to the conductor and improving the service life and long-term reliability of the medium-voltage fire-resistant cable. The first and second oxygen barrier layers are flame-retardant, and the mineral fire-resistant layer can decompose under heating conditions, playing a role in cooling. The fire resistance performance of the medium-voltage fire-resistant cable is improved through the synergistic effect of fire isolation, heat insulation and cooling.

[0004] However, existing medium-voltage mineral cables still have shortcomings in terms of chemical corrosion resistance and insulation stability. The protection system of existing medium-voltage cables is mainly based on fire resistance and lacks special design for chemical corrosion environments. The insulation layer and outer sheath materials do not take into account the corrosion of media such as acids, alkalis and salt spray. In highly corrosive scenarios such as chemical plants and marine environments, the insulation layer is prone to aging and damage, and cannot guarantee long-term stable operation. The existing medium-voltage cable structure design does not have an effective sealing system, and there are potential gaps at the joints between layers. Corrosive gases or liquids can easily penetrate into the cable, accelerating conductor oxidation and insulation failure, making it difficult to meet the insulation reliability requirements of high humidity and highly corrosive conditions. Utility Model Content

[0005] Technical problems to be solved The purpose of this invention is to provide a medium-voltage mineral-resistant cable to address the shortcomings of existing medium-voltage mineral-resistant cables in terms of chemical corrosion resistance and insulation stability, as mentioned in the background section.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a medium-voltage mineral wear-resistant cable, comprising a conductor, wherein the outer side of the conductor is sequentially covered from the inside to the outside with an inner insulation layer, an inner shielding layer, a metal isolation layer, an armor layer and an outer insulation layer, and a sealing layer is filled at the joints of each layer of the cable; The conductor surface is plated with a nickel-phosphorus alloy; the inner insulation layer consists of a high-purity magnesium oxide inner layer and a polytetrafluoroethylene film outer layer; the inner shielding layer is a semi-conductive polyvinylidene fluoride tape; the metal isolation layer is a seamless titanium alloy tube; the armor layer is a double-layer bidirectional spiral-wound Hastelloy tape; the outer insulation layer is an ethylene-tetrafluoroethylene copolymer with a nano-titanium dioxide coating on its outer surface; and the sealing layer is a silicone rubber sealant.

[0007] As a further improvement to the above scheme, the nickel-phosphorus alloy plating thickness of the conductor is 3-5 μm.

[0008] As a further improvement to the above solution, the high-purity magnesium oxide inner layer of the inner insulating layer has a filling density ≥3.2 g / cm³. 3 The outer layer of the polytetrafluoroethylene film has a thickness of 0.05–0.15 mm and an overlap rate of ≥15%.

[0009] As a further improvement to the above scheme, the thickness of the semi-conductive polyvinylidene fluoride tape of the inner shielding layer is 0.1 to 0.3 mm.

[0010] As a further improvement to the above solution, the wall thickness of the metal isolation layer is 1.0 to 1.5 mm.

[0011] As a further improvement to the above scheme, the Hastelloy strip thickness of the armor layer is 0.2 to 0.4 mm, and the double-layer winding overlap rate is ≥50%.

[0012] As a further improvement to the above scheme, the thickness of the outer insulation layer is 1.5 to 3.0 mm, and the thickness of the nano-titanium dioxide coating is 5 to 15 μm.

[0013] As a further improvement to the above solution, the sealing layer has a filling thickness of ≥0.8mm at the joints of each layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This medium-voltage mineral wear-resistant cable features a composite inner insulation layer and a silicone rubber sealing layer. The composite inner insulation layer, composed of high-purity magnesium oxide and polytetrafluoroethylene film, combines the advantages of high temperature resistance and chemical corrosion resistance to ensure stable insulation performance. The silicone rubber sealing layer fills the joints between the layers, forming a continuous sealing structure that prevents corrosive gases and liquids from penetrating into the cable. Compared with traditional cables, the insulation reliability is greatly improved. 2. This medium-voltage mineral wear-resistant cable features a nickel-phosphorus alloy conductor and a seamless titanium alloy metal insulation layer. The nickel-phosphorus alloy layer forms a dense protective film that effectively isolates the conductor from chemical corrosion. The seamless titanium alloy tube, with its high corrosion resistance, prevents external acids, alkalis, and salt spray from penetrating. Compared with traditional cables, the conductor's oxidation resistance is significantly improved, and its service life is extended. 3. This medium-voltage mineral wear-resistant cable features a double-layer, bidirectional spiral-wound Hastelloy armor layer and an ethylene-tetrafluoroethylene copolymer outer insulation layer. The Hastelloy armor layer, with its high strength and excellent wear resistance, resists scratches from sharp objects and mechanical compression. The ethylene-tetrafluoroethylene copolymer outer insulation layer, combined with a nano-titanium dioxide coating, possesses both chemical corrosion resistance and wear resistance, enabling the cable to adapt to harsh working conditions of high friction and strong corrosion. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the sealing layer of this utility model; Figure 3 This is a schematic diagram of the conductor cross-section structure of this utility model; Figure 4 This is a magnified structural diagram showing a partial detail of the outer insulation layer of this utility model.

[0016] In the diagram: 1. Conductor; 2. Inner insulation layer; 3. Inner shielding layer; 4. Metallic isolation layer; 5. Armor layer; 6. Outer insulation layer; 7. Sealing layer. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a medium-voltage mineral wear-resistant cable, including a conductor 1, the outer side of the conductor 1 is covered from the inside to the outside with an inner insulation layer 2, an inner shielding layer 3, a metal isolation layer 4, an armor layer 5 and an outer insulation layer 6, and a sealing layer 7 is filled at the joint of each layer of the cable. The conductor 1 is plated with a nickel-phosphorus alloy, the inner insulation layer 2 consists of a high-purity magnesium oxide inner layer and a polytetrafluoroethylene film outer layer, the inner shielding layer 3 is a semi-conductive polyvinylidene fluoride tape, and the metal isolation layer 4 is a seamless titanium alloy tube.

[0019] The nickel-phosphorus alloy plating of conductor 1 has a thickness of 3-5 μm, and the high-purity magnesium oxide inner layer of the inner insulation layer 2 has a filling density ≥3.2 g / cm³. 3 The outer layer of the polytetrafluoroethylene film has a thickness of 0.05–0.15 mm and an overlap rate of ≥15%. The inner shielding layer 3 has a semi-conductive polyvinylidene fluoride tape thickness of 0.1–0.3 mm, and the metal isolation layer 4 has a wall thickness of 1.0–1.5 mm. The conductor 1 is plated with a nickel-phosphorus alloy to reduce contact resistance and prevent oxidation, ensuring efficient current transmission. In the inner insulation layer 2, the high-purity magnesium oxide inner layer, with its high insulation and high temperature resistance (melting point exceeding 2800℃), isolates the conductor from the outside world. The polytetrafluoroethylene film outer layer, with its extremely strong chemical stability (resistant to strong acids, strong alkalis, and organic solvents), prevents corrosive media from penetrating. The combination of the inner and outer layers ensures stable insulation. The semi-conductive polyvinylidene fluoride strip in the inner shielding layer 3 evenly disperses the electric field, preventing partial discharge from damaging the insulation layer. The seamless titanium alloy tube in the metal isolation layer 4 forms a physical barrier to prevent external chemicals from penetrating into the cable and also serves as a grounding electrode to ensure electrical safety.

[0020] The armor layer 5 is a double-layered, bidirectional spiral-wound Hastelloy tape, the outer insulation layer 6 is an ethylene-tetrafluoroethylene copolymer with a nano-titanium dioxide coating on the outer surface, and the sealing layer 7 is a silicone rubber sealant.

[0021] The Hastelloy strip of the armor layer 5 has a thickness of 0.2-0.4 mm, the double-layer winding overlap rate is ≥50%, the outer insulation layer 6 has a thickness of 1.5-3.0 mm, the nano-titanium dioxide coating has a thickness of 5-15 μm, and the sealing layer 7 has a filling thickness of ≥0.8 mm at the joints of each layer.

[0022] The armor layer 5 uses a double-layer, bidirectional spiral-wound Hastelloy tape, which, with its high strength and excellent wear resistance, resists scratches from sharp objects and mechanical impacts, preventing the cable from being damaged by external forces. The ethylene-tetrafluoroethylene copolymer of the outer insulation layer 6 further enhances the insulation performance, and the nano-titanium dioxide coating on the outer surface improves weather resistance and resists ultraviolet aging. The silicone rubber sealant (sealing layer 7) filled at the joints of each cable layer forms a continuous elastic sealing structure after curing, preventing corrosive gases, liquids, and moisture from penetrating into the cable, avoiding conductor oxidation and insulation layer failure due to moisture, and ensuring long-term stable operation of the cable in harsh environments such as chemical and marine environments.

[0023] Working principle: Conductor 1 is plated with a nickel-phosphorus alloy to reduce contact resistance and prevent oxidation, ensuring efficient current transmission. In the inner insulation layer 2, a high-purity magnesium oxide inner layer, with its high insulation and high-temperature resistance (melting point exceeding 2800℃), isolates the conductor from the outside environment. The polytetrafluoroethylene film outer layer, with its extremely strong chemical stability (resistant to strong acids, strong alkalis, and organic solvents), prevents corrosive media from penetrating. The combination of inner and outer layers ensures stable insulation. The semi-conductive polyvinylidene fluoride strip in the inner shielding layer 3 evenly disperses the electric field, preventing partial discharge damage to the insulation layer. The seamless titanium alloy tube in the metal isolation layer 4 forms a physical barrier, preventing external chemicals from penetrating into the cable and also serving as grounding. Electrodes ensure electrical safety. The armor layer 5 uses a double-layer, bidirectional spiral-wound Hastelloy tape, which, with its high strength and excellent wear resistance, resists scratches from sharp objects and mechanical impacts, preventing cable damage due to external forces. The ethylene-tetrafluoroethylene copolymer of the outer insulation layer 6 further enhances the insulation performance, and the nano-titanium dioxide coating on the outer surface improves weather resistance and resists ultraviolet aging. The silicone rubber sealant (sealing layer 7) filled at the joints of each cable layer forms a continuous elastic sealing structure after curing, preventing corrosive gases, liquids, and moisture from penetrating into the cable, avoiding conductor oxidation and insulation layer failure due to moisture, and ensuring long-term stable operation of the cable in harsh environments such as chemical and marine environments.

[0024] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A medium-voltage mineral abrasion-resistant cable, comprising a conductor (1), characterized in that: The conductor (1) is covered from the inside out with an inner insulation layer (2), an inner shielding layer (3), a metal isolation layer (4), an armor layer (5) and an outer insulation layer (6), and each layer of the cable is filled with a sealing layer (7). The conductor (1) is plated with a nickel-phosphorus alloy. The inner insulation layer (2) is composed of a high-purity magnesium oxide inner layer and a polytetrafluoroethylene film outer layer. The inner shielding layer (3) is a semi-conductive polyvinylidene fluoride tape. The metal isolation layer (4) is a seamless titanium alloy tube. The armor layer (5) is a double-layer bidirectional spiral wound Hastelloy tape. The outer insulation layer (6) is an ethylene-tetrafluoroethylene copolymer with a nano-titanium dioxide coating on its outer surface. The sealing layer (7) is a silicone rubber sealant.

2. The medium-voltage mineral abrasion-resistant cable according to claim 1, characterized in that: The nickel-phosphorus alloy coating of the conductor (1) has a thickness of 3-5 μm.

3. The medium-voltage mineral abrasion-resistant cable according to claim 1, characterized in that: The high-purity magnesium oxide inner layer of the inner insulating layer (2) has a filling density ≥3.2 g / cm³. 3 The outer layer of the polytetrafluoroethylene film has a thickness of 0.05–0.15 mm and an overlap rate of ≥15%.

4. The medium-voltage mineral abrasion-resistant cable according to claim 1, characterized in that: The thickness of the semi-conductive polyvinylidene fluoride tape in the inner shielding layer (3) is 0.1 to 0.3 mm.

5. A medium-voltage mineral abrasion-resistant cable according to claim 1, characterized in that: The wall thickness of the metal isolation layer (4) is 1.0 to 1.5 mm.

6. The medium-voltage mineral abrasion-resistant cable according to claim 1, characterized in that: The Hastelloy strip of the armor layer (5) has a thickness of 0.2 to 0.4 mm and a double-layer winding overlap rate of ≥50%.

7. A medium-voltage mineral-resistant abrasion-resistant cable according to claim 1, characterized in that: The outer insulation layer (6) has a thickness of 1.5 to 3.0 mm, and the nano-titanium dioxide coating has a thickness of 5 to 15 μm.

8. A medium-voltage mineral abrasion-resistant cable according to claim 1, characterized in that: The sealing layer (7) has a thickness of ≥0.8mm at the joints of each layer.

Images