Oil-proof low-voltage power cable

Abstract

The utility model discloses an oil-proof low-voltage power cable, which relates to the technical field of power cables, and comprises a halogen-free polyethylene insulating layer and a conductor, an outer oil-proof layer and an inner oil-proof layer are respectively arranged outside and inside the halogen-free polyethylene insulating layer, a wear-resistant layer is arranged outside the outer oil-proof layer, the front section of the wear-resistant layer is gear-shaped, and the outer section of the wear-resistant layer is gear-shaped. The halogen-free polyethylene insulating layer is internally provided with an outer oil-proof layer, the halogen-free polyethylene insulating layer is internally provided with an inner oil-proof layer, the inner oil-proof layer is internally provided with an armor layer, the armor layer is internally provided with a flame-retardant layer, and the flame-retardant layer is internally provided with a corrosion-resistant layer. The oil resistance of the low-voltage power cable in the use process in an oil contamination environment is improved, the probability that external oil contamination permeates into the cable through the halogen-free polyethylene insulating layer is reduced, the damage degree of the cable due to oil contamination corrosion is reduced, and the cable has excellent harsh, complex and severe working condition environment resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to an oil-proof low-voltage power cable. Background Art

[0002] Power cables are cables used to transmit and distribute electrical energy. Power cables are often 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. Various insulated power cables can be divided into medium and low voltage power cables (35 kV and below), high voltage cables (above 110 kV), extra-high voltage cables (275 to 800 kV) and ultra-high voltage cables (1,000 kV and above) according to voltage levels. With the rapid development of the electric power industry, low-voltage wires and cables have been more widely used in many industries. When used in the petroleum and chemical fields, low-voltage power cables are easily penetrated by oil when they work in harsh environments containing oils and acid-base corrosive solutions for a long time. The oil often contains some acid-base substances that will corrode the cable. For this reason, we have designed an oil-proof low-voltage power cable. Utility Model Content

[0003] The utility model aims to provide an oil-proof low-voltage power cable to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An oil-proof low-voltage power cable comprises a halogen-free polyethylene insulation layer and a conductor, wherein an outer oil-proof layer and an inner oil-proof layer are respectively arranged on the outside and inside of the halogen-free polyethylene insulation layer, a wear-resistant layer is arranged on the outside of the outer oil-proof layer, and the positive section of the wear-resistant layer is gear-shaped, an armor layer is arranged on the inside of the inner oil-proof layer, a flame-retardant layer is arranged on the inside of the armor layer, a corrosion-resistant layer is arranged on the inside of the flame-retardant layer, a shielding layer is arranged on the inside of the corrosion-resistant layer, and three conductors are wrapped in the shielding layer.

[0006] As a further solution of the utility model: a filling layer is arranged between the shielding layer and the corrosion-resistant layer, and the filler of the filling layer is flame-retardant particles.

[0007] As a further solution of the utility model: the conductor includes a copper conductor core and an insulating layer, and the insulating layer is wrapped around the outside of the copper conductor core.

[0008] As a further solution of the utility model: three reinforcing steel wires distributed in an equilateral triangle are arranged in the filling layer.

[0009] As a further solution of the utility model: the thickness of the halogen-free polyethylene insulation layer is 3-5 cm.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. The utility model provides an outer oil-proof layer and an inner oil-proof layer, and the inner oil-proof layer and the outer oil-proof layer form a double-layer oil-proof protection inside and outside the halogen-free polyethylene insulation layer, thereby improving the oil resistance of the low-voltage power cable during use in an oily environment, reducing the probability of external oil penetrating into the cable through the halogen-free polyethylene insulation layer, and reducing the degree of damage to the cable caused by oil corrosion, so that the cable has excellent ability to withstand harsh, complex and severe working conditions.

[0012] 2. The utility model provides a wear-resistant layer with a gear-shaped cross-section outside the halogen-free polyethylene insulation layer. The gear-shaped structure causes friction between the tooth ends of the cable and the ground when the cable contacts the ground. Since the tooth ends are the last position of the entire wear-resistant layer, the wear-resistant layer is more wear-resistant, thereby protecting the halogen-free polyethylene insulation layer from wear and damage for a longer period of time, making the cable more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a front cross-sectional view of an oil-proof low-voltage power cable.

[0014] Figure 2 This is a schematic diagram of the partial structure of an oil-proof low-voltage power cable.

[0015] Figure 3 It is an oil-proof low-voltage power cable Figure 1 A magnified view of the structure at center.

[0016] 1. Halogen-free polyethylene insulation layer; 2. Outer oil-proof layer; 3. Wear-resistant layer; 4. Inner oil-proof layer; 5. Armor layer; 6. Flame retardant layer; 7. Corrosion-resistant layer; 8. Conductor; 801, copper conductor core; 802, insulation layer; 9. Shielding layer; 10. Filling layer; 11. Reinforced steel wire. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1In an embodiment of the utility model, an oil-proof low-voltage power cable comprises a halogen-free polyethylene insulation layer 1 and a conductor 8. The thickness of the halogen-free polyethylene insulation layer 1 is 3-5 cm. An outer oil-proof layer 2 and an inner oil-proof layer 4 are respectively arranged outside and inside the halogen-free polyethylene insulation layer 1. The outer oil-proof layer 2 and the inner oil-proof layer 4 are both made of TPU material. The inner oil-proof layer 4 and the outer oil-proof layer 2 form a double-layer oil-proof protection inside and outside the halogen-free polyethylene insulation layer 1, thereby improving the oil resistance of the low-voltage power cable during use in an oily environment and reducing the probability of external oil pollution penetrating into the cable through the halogen-free polyethylene insulation layer 1.

[0019] See also Figure 1 A wear-resistant layer 3 is arranged outside the outer oil-proof layer 2. The front section of the wear-resistant layer 3 is gear-shaped. The gear-shaped structure causes friction between the tooth end and the ground when the cable contacts the ground. Since the tooth end is the last position of the entire wear-resistant layer 3, the wear-resistant layer 3 is more wear-resistant, thereby protecting the halogen-free polyethylene insulation layer 1 from wear and damage for a longer time, making the cable more durable.

[0020] See also Figure 1-2 An armor layer 5 is arranged inside the inner oil-proof layer 4, and the armor layer 5 can increase the mechanical strength of the cable and improve the anti-corrosion ability. A corrosion-resistant layer 7 is arranged inside the flame-retardant layer 6, and a shielding layer 9 is arranged inside the corrosion-resistant layer 7. The shielding layer 9 is a metal braided layer, which can shield external signals and protect the conductor 8 from external electromagnetic interference, so that the cable operation is more stable. Three conductors 8 are wrapped in the shielding layer 9, and the conductor 8 includes a copper conductor core 801 and an insulating layer 802, and the insulating layer 802 is wrapped around the outside of the copper conductor core 801.

[0021] See also Figure 1 and Figure 3 A flame retardant layer 6 is arranged inside the armor layer 5, and a filling layer 10 is arranged between the shielding layer 9 and the corrosion-resistant layer 7. The filler of the filling layer 10 is flame retardant particles. The flame retardant particles and the flame retardant layer 6 form a double flame retardant protection structure. The flame retardant particles surround the conductor 8. When the flame retardant layer 6 is damaged or burned, the flame retardant particles can form a flame retardant barrier on the periphery of the conductor 8 to protect the conductor 8 from being ignited, making the cable have stronger flame retardant performance than existing cables.

[0022] See also Figure 1-2 Three reinforcing steel wires 11 distributed in an equilateral triangle are arranged in the filling layer 10. The addition of the reinforcing steel wires 11 can improve the strength and tensile properties of the cable, enable it to withstand greater tension and external pressure, and increase the service life of the cable.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An oil-proof low-voltage power cable, comprising a halogen-free polyethylene insulation layer (1) and a conductor (8), characterized in that: The halogen-free polyethylene insulation layer (1) is provided with an outer oil-proof layer (2) and an inner oil-proof layer (4) on the outside and inside respectively; the outer oil-proof layer (2) is provided with a wear-resistant layer (3) on the outside; the wear-resistant layer (3) has a gear-shaped cross-section; the inner oil-proof layer (4) is provided with an armor layer (5) on the inside; the armor layer (5) is provided with a flame-retardant layer (6) on the inside; the flame-retardant layer (6) is provided with a corrosion-resistant layer (7) on the inside; the corrosion-resistant layer (7) is provided with a shielding layer (9); and the shielding layer (9) contains three conductors (8).

2. The oil-proof low-voltage power cable according to claim 1, characterized in that: A filling layer (10) is provided between the shielding layer (9) and the corrosion-resistant layer (7), and the filler of the filling layer (10) is flame-retardant particles.

3. The oil-proof low-voltage power cable according to claim 1, characterized in that: The conductor (8) comprises a copper conductor core (801) and an insulating layer (802), wherein the insulating layer (802) is wrapped around the outside of the copper conductor core (801).

4. The oil-proof low-voltage power cable according to claim 2, characterized in that: Three reinforcing steel wires (11) distributed in an equilateral triangle are arranged in the filling layer (10).

5. The oil-proof low-voltage power cable according to claim 1, characterized in that: The thickness of the halogen-free polyethylene insulation layer (1) is 3-5 cm.

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