Low-smoke halogen-free flame-retardant high-voltage power cable

Abstract

The utility model discloses a low-smoke halogen-free flame-retardant high-voltage power cable, and the cable comprises an outer protection layer unit which comprises a silicone rubber protection layer, and the outer surface of the silicone rubber protection layer is provided with a fireproof coating; the armor layer comprises a steel belt layer and an aluminum belt layer, epoxy resin layers are arranged on the outer surfaces of the steel belt layer and the aluminum belt layer, and the outer surface of the steel belt layer is fixedly connected with the inner wall of the silicone rubber protective layer; and the inner protective layer comprises a first protective layer and a second protective layer. According to the utility model, the silicone rubber protection layer and the fireproof coating improve the fireproof and heat insulation effects, and the steel strip layer and the aluminum strip layer are arranged to improve the tensile strength and the impact resistance of the cable. And through multiple protection of the cross-linked polyethylene isolation layer, the first semiconductor layer and the second semiconductor layer, and through cooperation with the epoxy resin layer, the insulativity of the cable can be improved, and through arrangement of the filling layer, the combustion speed can be reduced, and the use effect of the cable can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a low-smoke, halogen-free, flame-retardant high-voltage power cable. Background Art

[0002] Power cables are used for high-voltage power transmission. Power cables are commonly used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. Power cables are generally buried in the soil or laid indoors, in trenches, and tunnels. The insulation distance between lines is small, no poles or towers are required, and the area occupied is small, basically no space on the ground. The insulation layer unit of the power cable is composed of various combustible materials such as paper, oil, hemp, rubber, plastic, and asphalt. Therefore, the cable has the possibility of catching fire and exploding. Low-smoke halogen-free flame-retardant high-voltage power cable is a specially designed cable. It is characterized by being made of low-smoke halogen-free materials to reduce harmful smoke and gas emissions during fires. It is usually used in places where fire safety needs to be improved, such as public buildings, subways, hospitals, etc.

[0003] The insulation performance of traditional high-voltage power cables may be affected in high temperature or humid environments, and they may soften or their physical properties may deteriorate, resulting in reduced tensile strength and impact resistance. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems existing in the existing low-smoke halogen-free flame-retardant high-voltage power cable, the present utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a low-smoke halogen-free flame-retardant high-voltage power cable, which is designed to solve the problem that "the insulation performance of traditional high-voltage power cables may be affected in high temperature or humid environments, and may soften or degrade in physical properties, resulting in reduced tensile strength and impact resistance."

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a low-smoke halogen-free flame-retardant high-voltage power cable, comprising:

[0008] The outer protective layer unit comprises a silicone rubber protective layer, wherein the outer surface of the silicone rubber protective layer is provided with a fireproof coating;

[0009] The armor layer comprises a steel belt layer and an aluminum belt layer, wherein the outer surfaces of the steel belt layer and the aluminum belt layer are both provided with an epoxy resin layer, and the outer surface of the steel belt layer is fixedly connected to the inner wall of the silicone rubber protective layer;

[0010] The inner protective layer comprises a first protective layer and a second protective layer, wherein the outer surface of the first protective layer is fixedly connected to the inner wall of the aluminum strip layer, and the inner wall of the second protective layer is fixedly provided with a filling layer;

[0011] The insulating layer unit comprises a cross-linked polyethylene isolation layer, the outer surface of the cross-linked polyethylene isolation layer is fixedly connected to the first semiconductor layer, and the inner wall of the cross-linked polyethylene isolation layer is fixedly connected to the second semiconductor layer;

[0012] The cable main body unit comprises a conductor, the outer surface of which is provided with a coating layer.

[0013] As a preferred solution of the low-smoke halogen-free flame-retardant high-voltage power cable described in the utility model, the outer surface of the aluminum belt layer is fixedly connected to the inner wall of the steel belt layer through an epoxy resin layer, and the epoxy resin layer wraps the steel belt layer and the aluminum belt layer.

[0014] As a preferred solution of the low-smoke halogen-free flame-retardant high-voltage power cable described in the utility model, the first protective layer is arranged on the outer surface of the second protective layer, the first protective layer is made of polyvinyl chloride material, and the second protective layer is made of polyethylene material.

[0015] As a preferred solution of the low-smoke halogen-free flame-retardant high-voltage power cable described in the utility model, the material of the filling layer is aluminum hydroxide or magnesium hydroxide, and the filling layer is arranged between the inner protective layer and the insulating layer unit.

[0016] As a preferred solution of the low-smoke halogen-free flame-retardant high-voltage power cable described in the utility model, the first semiconductor layer is fixedly connected to the inner wall of the filling layer, and the inner wall of the second semiconductor layer is fixedly connected to the outer surface of the coating layer.

[0017] As a preferred solution of the low-smoke halogen-free flame-retardant high-voltage power cable described in the utility model, the conductor is made of twisted copper wires or aluminum wires, and an epoxy resin layer is provided on the adjacent side of the coating layer and the conductor.

[0018] Beneficial effects of the utility model:

[0019] The fireproof and heat-insulating effects are improved by the silicone rubber protective layer and the fireproof coating, and the setting of the steel belt layer and the aluminum belt layer can improve the tensile strength and impact resistance of the cable. The multiple protections of the cross-linked polyethylene isolation layer, the first semiconductor layer and the second semiconductor layer combined with the epoxy resin layer can improve the insulation of the cable. At the same time, the setting of the filling layer can reduce the burning speed and improve the use effect of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of a low-smoke, halogen-free, flame-retardant high-voltage power cable proposed by the utility model;

[0022] Figure 2 for Figure 1 A cross-sectional view of an outer protective layer unit;

[0023] Figure 3 for Figure 1 A cross-sectional view of an armor layer unit;

[0024] Figure 4 for Figure 1 A cross-sectional view of an inner protective layer unit;

[0025] Figure 5 for Figure 1 A cross-sectional view of an insulating layer unit.

[0026] In the figure: 100, outer protective layer unit; 101, silicone rubber protective layer; 102, fireproof coating; 200, armor layer; 201, steel belt layer; 202, aluminum belt layer; 203, epoxy resin layer; 300, inner protective layer; 301, first protective layer; 302, second protective layer; 400, filling layer; 500, insulating layer unit; 501, cross-linked polyethylene isolation layer; 502, first semiconductor layer; 503, second semiconductor layer; 600, cable main body unit; 601, conductor; 602, sheath; DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Reference Figure 1-5 The utility model provides a low-smoke, halogen-free, flame-retardant high-voltage power cable, comprising:

[0032] The outer protective layer unit 100 comprises a silicone rubber protective layer 101, and a fireproof coating 102 is provided on the outer surface of the silicone rubber protective layer 101;

[0033] The armor layer 200 includes a steel belt layer 201 and an aluminum belt layer 202. The outer surfaces of the steel belt layer 201 and the aluminum belt layer 202 are both provided with an epoxy resin layer 203. The outer surface of the steel belt layer 201 is fixedly connected to the inner wall of the silicone rubber protective layer 101.

[0034] The inner protective layer 300 includes a first protective layer 301 and a second protective layer 302. The outer surface of the first protective layer 301 is fixedly connected to the inner wall of the aluminum strip layer 202. The inner wall of the second protective layer 302 is fixedly provided with a filling layer 400.

[0035] The insulating layer unit 500 comprises a cross-linked polyethylene isolation layer 501, the outer surface of the cross-linked polyethylene isolation layer 501 is fixedly connected to a first semiconductor layer 502, and the inner wall of the cross-linked polyethylene isolation layer 501 is fixedly connected to a second semiconductor layer 503;

[0036] The cable main body unit 600 includes a conductor 601, and the outer surface of the conductor 601 is provided with a coating layer 602. The silicone rubber protective layer 101 provides basic mechanical protection and waterproofness of the cable. At the same time, the external fireproof coating 102 can effectively prevent the spread of fire and improve the safety performance of the cable in the event of a fire. The steel belt layer 201 and the aluminum belt layer 202 in the armor layer 200 and the epoxy resin layer 203 on their surface not only enhance the physical protection ability of the cable, but also have a significant effect on resisting external impact and pressure, and also provide good chemical stability to prevent corrosion. The inner protective layer 300 further enhances the protection of the core part of the cable through the arrangement of the first protective layer 301 and the second protective layer 302. The existence of the filling layer 400 is to ensure the stability of the internal structure. The insulating layer unit 500 increases the insulation performance of the cable by using cross-linked polyethylene material. At the same time, the arrangement of the first semiconductor layer 502 and the second semiconductor layer 503 optimizes the electrical performance of the cable and reduces the loss of electric energy during transmission.

[0037] The outer surface of the aluminum tape layer 202 is fixedly connected to the inner wall of the steel tape layer 201 through the epoxy resin layer 203. The epoxy resin layer 203 wraps the steel tape layer 201 and the aluminum tape layer 202, effectively utilizing the advantages of the two metal materials, improving the mechanical strength and corrosion resistance of the overall armor layer 200, and improving the compression resistance and waterproof performance of the cable. The aluminum tape layer 202 has good corrosion resistance and light weight, which helps to reduce the weight of the overall cable, while the steel tape layer 201 provides stronger physical protection and structural support. The epoxy resin layer 203 has excellent chemical stability and electrical insulation, which can effectively isolate the interference of the external environment on the inside of the cable and ensure the safety and stability of power transmission.

[0038] Furthermore, the first protective layer 301 is arranged on the outer surface of the second protective layer 302. The first protective layer 301 is made of polyvinyl chloride material, and the second protective layer 302 is made of polyethylene material. The first protective layer 301 and the second protective layer 302 are made of different polymer materials, respectively, making full use of their respective physical and chemical properties, thereby providing more comprehensive protection. The second protective layer 302 is made of polyethylene material, which has good mechanical properties and chemical stability, and can effectively prevent external physical damage and chemical corrosion. At the same time, the good electrical insulation performance of polyethylene also ensures the safety of the internal conductor of the cable. The first protective layer 301 is made of polyvinyl chloride material, which not only enhances the mechanical protection of the outer layer, improves the wear resistance and impact resistance, but also the flame retardant performance of PVC provides additional safety for the cable.

[0039] Furthermore, the material of the filling layer 400 is aluminum hydroxide or magnesium hydroxide. The filling layer 400 is arranged between the inner protective layer 300 and the insulating layer unit 500. The filling layer 400 uses aluminum hydroxide or magnesium hydroxide as the material. These materials have excellent flame retardant and heat resistant properties. Aluminum hydroxide and magnesium hydroxide will decompose at high temperatures, absorb a large amount of heat energy, and release water vapor, thereby effectively reducing the temperature of the surrounding materials and preventing the spread of fire. The released water vapor can also dilute the oxygen concentration in the combustion area, further inhibiting the growth of flames.

[0040] Furthermore, the first semiconductor layer 502 is fixedly connected to the inner wall of the filling layer 400, and the inner wall of the second semiconductor layer 503 is fixedly connected to the outer surface of the coating layer 602. The main function of these two semiconductor layers is to provide a uniform electric field between the insulating layer unit 500 and the conductor of the cable and between the insulating layer unit 500 and the external shielding, thereby reducing the electric field concentration points and reducing the stress and damage to the insulating material caused by local high voltage.

[0041] Furthermore, the conductor 601 is made of twisted copper wires or aluminum wires, and an epoxy resin layer 203 is provided on the adjacent side of the coating layer 602 and the conductor 601. The epoxy resin layer 203 is provided between the coating layer 602 and the conductor 601 to form a solid insulating protective layer, which effectively isolates the conductor 601 from direct contact with the external environment, prevents the intrusion of moisture, salt and other corrosive substances, and can also resist external mechanical impact and extrusion, protecting the conductor 601 from damage.

[0042] During use, the cooperation of the silicone rubber protective layer 101 and the fire-retardant coating 102 can enhance the environmental resistance of the cable, such as UV resistance, wear resistance, and water resistance, while improving the flame retardant performance. The physical protection capability is improved under the double protection of the steel belt layer 201 and the aluminum belt layer 202, and it can prevent corrosion. The provision of the first protective layer 301 and the second protective layer 302 further enhances the protection of the core part of the cable. The filling layer 400 uses aluminum hydroxide or magnesium hydroxide as a material, which can absorb a large amount of heat energy and release water vapor to improve the fireproof effect. The provision of the first semiconductor layer 502 and the second semiconductor layer 503 can reduce the stress and damage to the insulating material caused by local high voltage, thereby improving the service life of the cable, thereby improving the use effect of the cable.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A low-smoke, halogen-free, flame-retardant high-voltage power cable, characterized in that: include: An outer protective layer unit (100) comprises a silicone rubber protective layer (101), wherein the outer surface of the silicone rubber protective layer (101) is provided with a fireproof coating (102); The armor layer (200) comprises a steel belt layer (201) and an aluminum belt layer (202), wherein the outer surfaces of the steel belt layer (201) and the aluminum belt layer (202) are both provided with an epoxy resin layer (203), and the outer surface of the steel belt layer (201) is fixedly connected to the inner wall of the silicone rubber protective layer (101); The inner protective layer (300) comprises a first protective layer (301) and a second protective layer (302), wherein the outer surface of the first protective layer (301) is fixedly connected to the inner wall of the aluminum strip layer (202), and the inner wall of the second protective layer (302) is fixedly provided with a filling layer (400); An insulating layer unit (500) comprises a cross-linked polyethylene isolation layer (501), the outer surface of the cross-linked polyethylene isolation layer (501) being fixedly connected to a first semiconductor layer (502), and the inner wall of the cross-linked polyethylene isolation layer (501) being fixedly connected to a second semiconductor layer (503); The cable main body unit (600) comprises a conductor (601), wherein the outer surface of the conductor (601) is provided with a coating layer (602).

2. The low-smoke, halogen-free, flame-retardant high-voltage power cable according to claim 1, characterized in that: The outer surface of the aluminum strip layer (202) is fixedly connected to the inner wall of the steel strip layer (201) via an epoxy resin layer (203), and the epoxy resin layer (203) wraps the steel strip layer (201) and the aluminum strip layer (202).

3. The low-smoke, halogen-free, flame-retardant high-voltage power cable according to claim 1, characterized in that: The first protective layer (301) is arranged on the outer surface of the second protective layer (302); the first protective layer (301) is made of polyvinyl chloride material, and the second protective layer (302) is made of polyethylene material.

4. The low-smoke, halogen-free, flame-retardant high-voltage power cable according to claim 1, characterized in that: The material of the filling layer (400) is aluminum hydroxide or magnesium hydroxide, and the filling layer (400) is arranged between the inner protective layer (300) and the insulating layer unit (500).

5. The low-smoke, halogen-free, flame-retardant high-voltage power cable according to claim 1, characterized in that: The first semiconductor layer (502) is fixedly connected to the inner wall of the filling layer (400), and the inner wall of the second semiconductor layer (503) is fixedly connected to the outer surface of the coating layer (602).

6. The low-smoke, halogen-free, flame-retardant high-voltage power cable according to claim 1, characterized in that: The conductive wire (601) is made of twisted copper wires or aluminum wires, and an epoxy resin layer (203) is provided on the adjacent side of the coating layer (602) and the conductive wire (601).

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