High-power cold-resistant torsion-resistant flexible cable for wind power generation

Abstract

The utility model relates to the technical field of cables for wind power generation, and discloses a high-power cold-resistant torsion-resistant flexible cable for wind power generation, which comprises a cable body, a conductor is arranged in the middle of the cable body, an inner protective layer is arranged on the outer wall of the conductor, and a reinforced core layer is arranged on the outer wall of the inner protective layer. The outer wall of the reinforcing core layer is provided with an insulating layer, the outer wall of the insulating layer is provided with a signal shielding layer, the outer wall of the signal shielding layer is provided with a fireproof isolation layer, the outer wall of the fireproof isolation layer is provided with an anti-torsion metal braid layer, and the outer wall of the anti-torsion metal braid layer is provided with a cold-resistant rubber outer sheath. According to the utility model, by arranging the pulleys on the outer wall of the cable, damage to the cable caused by movement of squirrels and other animals along the cable can be effectively reduced, and by arranging the cable body in a layered manner, the cable can maintain good physical performance and torsion resistance in cold climate, so that power transmission continuity is guaranteed, and maintenance and fault risks are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables for wind power generation, in particular to a high-power cold-resistant and torsion-resistant flexible cable for wind power generation. Background Art

[0002] As the global demand for clean energy continues to increase, wind power generation has developed rapidly as an important form of renewable energy utilization. Wind power generation equipment is usually installed in areas with relatively harsh environments, such as high-altitude mountains, cold coastal areas or vast grasslands. The climatic conditions in these places are complex, which places high demands on the cables connecting the various components of the wind turbine.

[0003] In cold regions, the insulation materials of ordinary cables will become hard and brittle. For example, when the temperature drops, traditional polyvinyl chloride (PVC) insulation materials will lose their elasticity, which will not only lead to a decline in insulation performance, but may also crack due to embrittlement of the material, posing a serious threat to the safety of the cable. At the same time, low temperatures will also affect the electrical conductivity of the cable and increase the loss of power transmission. The nacelle and impeller of the wind turbine will continuously rotate during operation, and the cables connected to them need to be twisted accordingly. For cables that transmit high power, due to their thick internal conductors and complex structures, frequent twisting will generate huge torsional stress. If the cable has poor torsional resistance, it will cause relative displacement between the internal conductor, insulation layer and sheath, resulting in cable damage, such as conductor breakage and insulation wear, thereby affecting the stability of power transmission.

[0004] In this regard, to address the technical problems that cables become brittle when exposed to low temperatures and are unable to withstand large torsional forces, this application proposes a high-power cold-resistant and torsion-resistant flexible cable for wind power generation. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the existing technology and to propose a high-power cold-resistant and torsion-resistant soft cable for wind power generation, so that the cable can be more resistant to low temperatures and torsional forces, and a pulley is provided to allow small animals to climb the cable.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A high-power cold-resistant and torsion-resistant flexible cable for wind power generation comprises a cable body, a conductor is arranged in the middle of the cable body, an inner protective layer is arranged on the outer wall of the conductor, a reinforcing core layer is arranged on the outer wall of the inner protective layer, an insulating layer is arranged on the outer wall of the reinforcing core layer, a signal shielding layer is arranged on the outer wall of the insulating layer, a fireproof isolation layer is arranged on the outer wall of the signal shielding layer, a torsion-resistant metal braided layer is arranged on the outer wall of the fireproof isolation layer, and a cold-resistant rubber outer sheath is arranged on the outer wall of the torsion-resistant metal braided layer.

[0008] Furthermore, a plurality of pulleys are sleeved on the outer wall of the cable body, and a fixing ring is fixedly connected to the outer wall of the pulley.

[0009] Furthermore, the outer surface of the pulley is coated with antifreeze lubricating oil.

[0010] Furthermore, the conductor is made of a core made of copper, and the inner protective layer is made of polytetrafluoroethylene.

[0011] Furthermore, the reinforcing core layer is made of aramid fiber as a raw material, and the insulating layer is made of polyimide as a raw material.

[0012] Furthermore, the signal shielding layer is made of conductive plastic as a raw material, and the fireproof isolation layer is made of ceramic silicone rubber as a raw material.

[0013] Furthermore, the torsion-resistant metal braided layer is made of shape memory alloy wire, and the cold-resistant rubber outer sheath is made of thermoplastic elastomer.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, a pulley is provided on the outer wall of the cable, making it difficult for some small mammals to bite and damage the cable. When the animal tries to climb or touch the cable, the rotation of the pulley makes it difficult for the animal to maintain balance, and thus gives up touching the cable. The pulley can effectively reduce the damage to the cable caused by animals such as squirrels moving along the cable.

[0016] 2. In the present invention, the cable body is layered to enable the cable to transmit power stably and extend its service life. The cold-resistant property allows the cable to maintain good physical properties in cold climates, and the anti-torsion force ensures the continuity of power transmission and reduces maintenance and failure risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of a high-power cold-resistant and torsion-resistant flexible cable for wind power generation proposed by the utility model;

[0018] Figure 2 This is a vertical cross-sectional view of the cable body of a high-power cold-resistant and torsion-resistant flexible cable for wind power generation proposed by the utility model;

[0019] Figure 3 This is a cross-sectional view of the cable body of a high-power cold-resistant and torsion-resistant flexible cable for wind power generation proposed by the utility model;

[0020] Figure 4 This is a half-section view of the cable body of a high-power cold-resistant and torsion-resistant flexible cable for wind power generation proposed by the utility model.

[0021] Legend:

[0022] 1. Cable body; 2. Conductor; 3. Inner protective layer; 4. Reinforced core layer; 5. Insulation layer; 6. Signal shielding layer; 7. Fireproof isolation layer; 8. Torsion-resistant metal braided layer; 9. Cold-resistant rubber outer sheath; 10. Pulley; 11. Fixing ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Reference Figure 1 、 Figure 3 and Figure 4 The utility model provides an embodiment: a high-power cold-resistant and torsion-resistant soft cable for wind power generation, comprising a cable body 1, a conductor 2 is arranged in the middle of the cable body 1, an inner protective layer 3 is arranged on the outer wall of the conductor 2, a reinforcing core layer 4 is arranged on the outer wall of the inner protective layer 3, an insulating layer 5 is arranged on the outer wall of the reinforcing core layer 4, a signal shielding layer 6 is arranged on the outer wall of the insulating layer 5, a fireproof isolation layer 7 is arranged on the outer wall of the signal shielding layer 6, a torsion-resistant metal braided layer 8 is arranged on the outer wall of the fireproof isolation layer 7, a cold-resistant rubber outer sheath 9 is arranged on the outer wall of the torsion-resistant metal braided layer 8, the fireproof isolation layer 7 is made of ceramic silicone rubber as raw material, the torsion-resistant metal braided layer 8 is made of shape memory alloy wire as raw material, and the cold-resistant rubber outer sheath 9 is made of thermoplastic elastomer as raw material.

[0025] Specifically, the cold-resistant rubber outer sheath 9 is directly exposed to the external environment and is the first line of defense against external factors such as cold and physical damage. In a cold environment, it prevents the cable outer sheath from becoming brittle and cracking due to low temperature, and can ensure that the cable can bend and stretch normally to maintain normal working conditions. As the outermost layer of the cable, it can resist external physical damage, such as scratches by wind, sand, and stones in ice and snow. Thermoplastic elastomer material has both the elasticity of rubber and the processability of plastic, has good cold resistance, can still maintain good flexibility at low temperatures, and has excellent wear resistance, aging resistance, and chemical corrosion resistance. It is also recyclable and more environmentally friendly. The torsion-resistant metal braided layer 8 is located on the inside of the cold-resistant rubber outer sheath 9. While protecting the cable from torsional damage, it can also assist the outer sheath in enhancing the overall mechanical properties. During the operation of the wind turbine, the cable will twist with the rotation of the wind turbine. The cold-resistant rubber outer sheath 9 can effectively resist torsional force, avoid damage to the internal structure of the cable due to excessive torsion, and ensure the stability of the electrical performance of the cable. The torsion-resistant metal braided layer 8 can also It plays the role of releasing static electricity and preventing static electricity accumulation from damaging the cable. The shape memory alloy wire can return to a preset shape under certain conditions, has good elasticity and deformation resistance, and can provide additional restoring force when the cable is twisted or bent, effectively resisting torsional deformation and improving the service life of the cable. The fireproof isolation layer 7 is on the inside of the torsion-resistant metal braided layer 8. When encountering fire and other situations, it can prevent the flame from spreading inward and protect the internal key structures. When a fire occurs nearby, the torsion-resistant metal braided layer 8 can prevent the flame from spreading along the cable, preventing the fire from expanding to the entire power system, and protecting other structures and peripheral equipment inside the cable. In addition to preventing the fire, it can also isolate heat to a certain extent, ensuring that the cable can still maintain certain functions in the early stage of the fire. At room temperature, ceramic silicone rubber has the elasticity and flexibility of rubber, which is convenient for cable processing and installation. When encountering high temperatures of fire, it will quickly transform into a hard ceramic-like substance, forming a layer of heat-insulating and oxygen-isolating protective layer to prevent the spread of fire and provide excellent fireproof performance for the cable.

[0026] Reference Figure 1-Figure 3 The outer wall of the cable body 1 is provided with several pulleys 10, the outer wall of the pulley 10 is fixedly connected with a fixing ring 11, the outer surface of the pulley 10 is coated with antifreeze lubricating oil, the conductor 2 is a wire core made of copper, the inner protective layer 3 is made of polytetrafluoroethylene, the reinforcing core layer 4 is made of aramid fiber, the insulating layer 5 is made of polyimide, and the signal shielding layer 6 is made of conductive plastic.

[0027] Specifically, the pulley 10 is made of plastic, can rotate, is light in weight, and has a small size, and will not affect the cable body 1 itself. The signal shielding layer 6 is on the inside of the fireproof isolation layer 7 and is used to shield external electromagnetic interference to ensure the stability and confidentiality of internal signal transmission. Conductive plastic is a new type of shielding material with good conductivity and shielding performance. Conductive plastic is light in weight, corrosion-resistant, and has good processability. It can be processed into signal shielding layers 6 of various shapes through injection molding, extrusion, and other processes, which is convenient for cable production and installation. The insulating layer 5 is located on the inside of the signal shielding layer 6. Its main function is to prevent current leakage, ensure electrical safety, isolate different conductive parts, and ensure that electrical energy can be safely transmitted inside the cable, especially during high-power transmission, it can withstand high voltage and avoid electrical accidents such as short circuits. Polyimide is a high-performance insulating material with the advantages of high temperature resistance, radiation resistance, and chemical corrosion resistance. In high-power cables for wind power generation, polyimide can withstand higher temperatures and voltages to ensure the safe operation of the cable. In addition, the mechanical strength of polyimide material is high, which can effectively protect the internal structure of the cable, improve the reliability of the cable, and strengthen the core. Layer 4 is surrounded by the insulating layer 5, providing tensile and bending resistance support for the cable, ensuring that the internal structure of the cable is not damaged when it is subjected to tension and bending. The reinforced core layer 4 can significantly improve the tensile strength of the cable, prevent the cable from being broken, and ensure that the cable can be hung and work normally. In addition to tensile resistance, it can also provide support when the cable is bent, preventing the cable from damaging the internal structure due to excessive bending, and helping the cable to adapt to various dynamic operating environments of the wind turbine. Aramid fiber is a high-performance synthetic fiber with high strength, high modulus, and high temperature resistance. Aramid fiber is used in the reinforced core layer 4. , which can effectively improve the torsional resistance and tensile strength of the cable, and the density of aramid fiber is low, which can reduce the weight of the cable and improve the flexibility of the cable. The inner protective layer 3 wraps the conductor 2 to prevent moisture and chemicals from corroding the conductor 2 and other internal structures. Polytetrafluoroethylene has excellent corrosion resistance, high temperature resistance and non-stickiness, and can effectively prevent moisture, chemicals, etc. from corroding the internal structure of the cable. Using polytetrafluoroethylene as the inner protective layer 3 can improve the weather resistance and service life of the cable. The conductor 2 is the part that transmits electrical energy or signals, and is a wire core made of copper.

[0028] Working principle: By setting a pulley 10 on the outer wall of the cable body 1, the pulley 10 can rotate to prevent small animals from climbing the cable body 1. The cold-resistant rubber outer sheath 9 is directly exposed to the external environment and is the first line of defense against external factors such as cold and physical damage. The torsion-resistant metal braided layer 8 is located inside the cold-resistant rubber outer sheath 9. While protecting the cable from torsional damage, it can also assist the cold-resistant rubber outer sheath 9 to enhance the overall mechanical properties. The fireproof isolation layer 7 is located inside the torsion-resistant metal braided layer 8. When encountering fire and other situations, it can prevent the flame from spreading inward and protect the internal joints. Key structure, the signal shielding layer 6 is located on the inner side of the fireproof isolation layer 7, which is used to shield external electromagnetic interference and ensure the stability and confidentiality of internal signal transmission. The insulating layer 5 is located on the inner side of the signal shielding layer 6, and its main function is to prevent current leakage and ensure electrical safety. The reinforcing core layer 4 is located on the inner side of the insulating layer 5, and provides tensile and bending support for the cable body 1 to ensure that the internal structure of the cable body 1 is not damaged when it is subjected to tension and bending. The inner protective layer 3 is located on the inner side of the reinforcing core layer 4 and wraps the conductor 2 to prevent moisture and chemicals from eroding the conductor 2 and other internal structures.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-power cold-resistant and torsion-resistant flexible cable for wind power generation, characterized in that: The invention comprises a cable body (1), wherein a conductor (2) is arranged in the middle of the cable body (1), an inner protective layer (3) is arranged on the outer wall of the conductor (2), a reinforcing core layer (4) is arranged on the outer wall of the inner protective layer (3), an insulating layer (5) is arranged on the outer wall of the reinforcing core layer (4), a signal shielding layer (6) is arranged on the outer wall of the insulating layer (5), a fireproof isolation layer (7) is arranged on the outer wall of the signal shielding layer (6), a torsion-resistant metal braided layer (8) is arranged on the outer wall of the fireproof isolation layer (7), and a cold-resistant rubber outer sheath (9) is arranged on the outer wall of the torsion-resistant metal braided layer (8).

2. The high-power cold-resistant and torsion-resistant flexible cable for wind power generation according to claim 1, characterized in that: The outer wall of the cable body (1) is sleeved with a plurality of pulleys (10), and the outer wall of the pulley (10) is fixedly connected with a fixing ring (11).

3. The high-power cold-resistant and torsion-resistant flexible cable for wind power generation according to claim 2, characterized in that: The outer surface of the pulley (10) is coated with antifreeze lubricating oil.

4. The high-power cold-resistant and torsion-resistant flexible cable for wind power generation according to claim 1, characterized in that: The conductor (2) is a wire core made of copper as a raw material, and the inner protective layer (3) is made of polytetrafluoroethylene as a raw material.

5. The high-power cold-resistant and torsion-resistant flexible cable for wind power generation according to claim 1, characterized in that: The reinforcing core layer (4) is made of aramid fiber as a raw material, and the insulating layer (5) is made of polyimide as a raw material.

6. The high-power cold-resistant and torsion-resistant flexible cable for wind power generation according to claim 1, characterized in that: The signal shielding layer (6) is made of conductive plastic as a raw material, and the fireproof isolation layer (7) is made of ceramic silicone rubber as a raw material.

7. The high-power cold-resistant and torsion-resistant flexible cable for wind power generation according to claim 1, characterized in that: The torsion-resistant metal braided layer (8) is made of shape memory alloy wire as a raw material, and the cold-resistant rubber outer sheath (9) is made of thermoplastic elastomer as a raw material.

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