Bending-resistant high-shielding wind energy control cable

Abstract

The utility model provides a bending-resistant high-shielding wind energy control cable, which comprises a plurality of cable cores, each cable core comprises a conductor and a conductor insulating layer wrapped outside the conductor, the conductor is formed by stranding bunch-stranded tinned copper wires and conductive carbon fibers, an inner protective layer, a reinforcing layer and an outer protective layer are wrapped outside the plurality of cable cores in sequence, and the inner protective layer, the reinforcing layer and the outer protective layer are wrapped outside the plurality of cable cores in sequence. The inner protective layer is a silicon rubber inner protective layer, the reinforcing layer is a fine galvanized steel wire reinforcing layer, and the outer protective layer is a high-strength polyether polyurethane outer protective layer; the repeated tensile property of the conductor is enhanced, the stress of the tinned copper wire is reduced, and the core breaking phenomenon is avoided; meanwhile, the repeated bending resistance of the cable is improved, the electromagnetic shielding effect of the cable is improved, and the service life of the cable is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly relates to a wind energy control cable with high bending resistance and high shielding performance. Background Art

[0002] As a clean and renewable energy source, wind energy has been increasingly valued by countries around the world. The proportion of offshore wind farms is also increasing, and the capacity of wind turbines is gradually getting larger, with the capacity reaching more than 16 MW. With the development of technology, a medium and high voltage power cable is used instead of multiple low voltage power cables for large-capacity wind turbines, and a control cable is used in supporting, greatly reducing the number of cables used and the manufacturing cost of wind turbines.

[0003] The torsional medium voltage power wind energy cable and the control cable used inside the wind turbine tower are directly laid from the top to the bottom of the wind turbine. Among them, the power cable and the control cable are bundled together. During the yaw process of the wind turbine, the cables will twist accordingly. The outer diameter of the power cable reaches 80 - 110 mm, while the cross-sectional area of the conductor of the control cable is small, and the outer diameter is generally 8 - 15 mm. During use, affected by the extrusion of the power cable and repeated torsional bending, etc., the problem of cable core breakage is likely to occur, resulting in the wind turbine losing the control signal, affecting the operation of the wind turbine, and causing greater economic losses. The control cable is not only interfered by electrical signals but also often interfered by magnetic signals, and the shielding effect of the cable is not good, which affects the transmitted signal. Summary of the Invention

[0004] The purpose of the utility model is to provide a wind energy control cable with high bending resistance and high shielding performance to solve the above problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A wind energy control cable with high bending resistance and high shielding performance, comprising a plurality of cable cores. Each cable core includes a conductor and a conductor insulation layer wrapped outside the conductor. The conductor is formed by stranding tinned copper wires and conductive carbon fibers. An inner sheath, a strengthening layer, and an outer sheath are sequentially wrapped outside the plurality of cable cores. The inner sheath is a silicone rubber inner sheath, the strengthening layer is a fine galvanized steel wire strengthening layer, and the outer sheath is a high-strength polyether-type polyurethane outer sheath.

[0007] As a further improved technical solution of the utility model, the cross-sectional area of the conductor is 0.75 - 2.5 mm 2 , the conductive carbon fiber is located at the center of a plurality of stranded tinned copper wires, the tensile strength of the conductive carbon fiber is 4 GPa, the diameter of the tinned copper wire is 0.15 mm, and the elongation at break of the tinned copper wire ≥ 15%.

[0008] As a further improved technical solution of the present utility model, the conductive carbon fibers of the conductor are arranged and stranded with tinned copper wires, and the stranding pitch ratios from the inside to the outside are sequentially controlled to be 18-20 times, and the stranding direction is the same-direction stranding.

[0009] As a further improved technical solution of the present utility model, the conductor insulation layer is a high-strength thermoplastic elastomer insulation layer.

[0010] As a further improved technical solution of the present utility model, a first wrapping layer is coated outside several of the cable cores, and a reinforcing filler is arranged between the first wrapping layer and outside the conductor insulation layer, and the reinforcing filler is a polyester reinforcing yarn.

[0011] As a further improved technical solution of the present utility model, a tinned copper wire braided layer is arranged between the first wrapping layer and the inner sheath layer.

[0012] As a further improved technical solution of the present utility model, a steel-plastic composite tape is arranged between the tinned copper wire braided layer and the inner sheath layer.

[0013] As a further improved technical solution of the present utility model, there are 6 galvanized steel wires in the reinforcing layer and they are evenly wound outside the inner sheath layer.

[0014] As a further improved technical solution of the present utility model, the tensile strength of the high-strength thermoplastic elastomer insulation layer ≥ 15 N / mm 2 , the elongation at break ≥ 300%, and the Shore hardness is 82 HA.

[0015] As a further improved technical solution of the present utility model, the tensile strength of the silicone rubber inner sheath layer is 8 Mpa, and the elongation at break > 200%; the tensile strength of the high-strength polyether-type polyurethane outer sheath layer ≥ 30 N / mm 2 , the elongation at break ≥ 300%, and the tear strength ≥ 40 N / mm.

[0016] The beneficial effects of the present utility model are as follows:

[0017] Through the above structure, the repeated tensile performance of the conductor is enhanced, the stress on the tinned copper wires is reduced, and the phenomenon of core breakage is avoided; at the same time, the repeated bending resistance performance of the cable is increased, the electromagnetic shielding effect of the cable is improved, and the service life of the cable is ensured. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a bend-resistant high-shielding wind energy control cable.

[0019] Among them: 1 - conductor, 2 - conductor insulation layer, 3 - reinforcing filler, 4 - first wrapping layer, 5 - braided layer, 6 - second wrapping layer, 7 - inner sheath layer, 8 - reinforcing layer, 9 - outer sheath layer. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0021] If the utility model involves directions (e.g., up, down, left, right, front, back, outside, inside, etc.) when describing, it is necessary to define the directions involved, such as "In order to clearly express the positions and directions described in the utility model, the end close to the operator is the proximal end, and the end away from the operator is the distal end." Or define it with the paper as a reference, etc. Of course, if the positional relationship between the two is defined by mutual reference in the subsequent description, it does not need to be defined here.

[0022] A bending-resistant high-shield wind energy control cable, such as Figure 1 As shown, the bending-resistant high-shielded wind energy control cable includes a plurality of cable cores, each of which includes a conductor 1 and a conductor insulation layer 2 coated on the outside of the conductor 1, and a first wrapping layer 4, a braided layer 5, a second wrapping layer 6, an inner protective layer 7, a reinforcement layer 8 and an outer protective layer 9 are sequentially coated on the outside of the plurality of cable cores.

[0023] The conductor 1 is formed by twisting tinned copper wire and conductive carbon fiber. The conductive carbon fiber has excellent conductivity and extremely high tensile strength, which far exceeds traditional metal materials. This makes the cable core have better stability when subjected to external forces, as well as corrosion resistance, wear resistance, high temperature resistance, high strength, light weight and other advantages, which helps to reduce the overall weight of the cable core and extend the service life of the cable core. The tinned copper wire has the characteristics of anti-oxidation, high temperature resistance, strong flexibility, and excellent electrical properties. The overall strength and flexibility of the tinned copper wire are enhanced by the bundle twisting process; the tinned copper wire is combined with the high conductivity, high strength and low density of the conductive carbon fiber, so that the cable core has both excellent bearing capacity and maintains a relatively light weight, which is conducive to reducing the overall burden of the cable and adapting to various complex installation environments. The corrosion resistance and oxidation resistance of the conductive carbon fiber and the tinned copper wire jointly improve the service life and stability of the cable core.

[0024] As an embodiment of the present invention, the cross-sectional area of the conductor 1 is 0.75-2.5 mm 2, the conductive carbon fiber is located at the center of several bundles of stranded tinned copper wires. The tensile strength of the conductive carbon fiber reaches 4 GPa, the diameter of the tinned copper wire is 0.15 mm, and the elongation at break of the tinned copper wire is greater than or equal to 15%. The tinned copper wires are stranded into bundles according to a certain number of strands and pitches, and then the stranded tinned copper wires and the central conductive carbon fiber are arranged and stranded in a regular stranding method. The stranding pitch ratios from the inside to the outside are controlled to be 18 - 20 times in sequence, and the stranding direction is the same-direction stranding, so as to ensure that the structure of the conductor 1 is compact and the outer diameter is stable.

[0025] The conductor insulation layer 2 is a high-strength thermoplastic elastomer insulation layer. The thermoplastic elastomer has the high elasticity, high strength, and high resilience of rubber, and at the same time has the characteristics of convenient processing and a wide range of processing methods of ordinary plastics. On the basis of maintaining the original high elasticity, high strength, high resilience, etc. of the thermoplastic elastomer, the high-strength thermoplastic elastomer further improves its mechanical properties and durability. As an embodiment of the present invention, the tensile strength of the high-strength thermoplastic elastomer is ≥ 15 N / mm 2 , the elongation at break is ≥ 300%, and the Shore hardness is 82 HA. The conductor 1 and the conductor insulation layer 2 are closely and evenly bonded together.

[0026] When cabling, several of the above-mentioned cable cores are stranded together. The several cable cores do not contact each other, and polyester reinforcing yarns are filled between the several cable cores to improve the anti-extrusion and tensile properties. The pitch-diameter ratio of cabling is controlled within 8 - 10 times.

[0027] The first wrapping layer 4 is a non-woven wrapping tape. The first wrapping layer 4 is used to wind and tie the above-mentioned several cable cores to prevent the several cable cores from loosening and separating.

[0028] A reinforcing filler 3 is arranged between the first wrapping layer 4 and outside the conductor insulation layer 2. The reinforcing filler 3 is used to improve the stability of the cable. As an embodiment of the present invention, the reinforcing filler 3 adopts polyester reinforcing yarn. The polyester reinforcing yarn has the advantages of high strength and high wear resistance, can withstand a large tensile force. At the same time, the polyester reinforcing yarn performs well in terms of dimensional stability and wrinkle resistance and is not easily deformed.

[0029] As an embodiment of the present invention, the braided layer 5 is a tinned copper wire braided layer. The single wire diameter of the tinned copper wire used in the braided layer 5 is 0.2 mm, the braiding density is 85%, and the braiding angle is 40 - 45 degrees. The tinned copper wire braided layer has good electromagnetic shielding performance, can effectively reduce electromagnetic interference, and improve the operation stability and reliability. At the same time, the tinned copper wire braided layer has excellent oxidation resistance and corrosion resistance, and prolongs the service life. The braided structure makes the tinned copper wire braided layer have good flexibility and stretchability. The copper wire itself has good electrical conductivity, so that the braided layer 5 has a low resistance and loss when transmitting current.

[0030] The second wrapping layer 6 is a steel-plastic composite tape. As an embodiment of the present invention, the steel-plastic composite tape is composed of a single-sided steel strip and a composite ethylene-acrylic acid copolymer (EAA), which is a comprehensive product of rigid materials and flexible materials, has high strength and stiffness, and has a good shielding effect on interfering magnetic signals. The thickness of the steel-plastic composite tape is 0.2 mm, the strength is 350 MPa, and the elongation rate > 15%. The tinned copper wire braid layer and the steel-plastic composite tape enhance the tensile strength of the cable while also improving the anti-interference and electromagnetic radiation of the cable.

[0031] The inner sheath 7 is a silicone rubber inner sheath. The silicone rubber material is softer than ordinary rubber materials, so that the cable can have a buffering process when being extruded, avoiding affecting the internal cable core. As an embodiment of the present invention, the tensile strength of the silicone rubber inner sheath is 8 Mpa, and the elongation at break > 200%. The silicone rubber material has excellent heat resistance, low temperature resistance, and high resistivity, can maintain elasticity and stability at high temperatures, can still work at low temperatures, and can maintain a stable resistance value within a wide temperature and frequency range. At the same time, the silicone rubber material also has good processing performance, insulation performance, and certain flame retardancy and radiation resistance.

[0032] The strengthening layer 8 is a fine galvanized steel wire strengthening layer. The strengthening layer 8 is wound around the outer sheath 7 with 6 fine galvanized steel wires evenly, which can not affect the overall torsional and bending performance of the cable. At the same time, when the cable is subjected to torsional and bending, the fine galvanized steel wire strengthening layer can bear the tensile force, so that the tensile force transmitted to the inside of the cable core is reduced, and the anti-external mechanical damage ability of the cable is enhanced, preventing the cable from bending and deforming, thereby ensuring the normal operation and service life of the cable.

[0033] The outer sheath 9 is a high-strength polyether-type polyurethane outer sheath. The high-strength polyether-type polyurethane has good elasticity and flexibility, can maintain the stability of its shape and structure when the cable is bent or under external force, enhance the mechanical strength of the cable, protect key components such as the cable core and the braid layer 5 from external damage and erosion, reduce stress concentration and plastic deformation inside the cable. At the same time, the high-strength polyether-type polyurethane has excellent hydrolysis resistance, solvent resistance, wear resistance and cold resistance, can maintain the integrity and safety of the cable, and extend the service life of the cable. As an embodiment of the present invention, the tensile strength of the high-strength polyether-type polyurethane ≥ 30 N / mm 2 , the elongation at break ≥ 300%, and the tear strength of the large trouser-shaped cutter (tested according to GB / T529-2008 trouser-shaped test) ≥ 40 N / mm.

[0034] By providing three layers, namely the outer sheath 9, the strengthening layer 8, and the inner sheath 7, the flexibility of the cable is enhanced, ensuring the normal operation of the cable and extending its service life.

[0035] For the bend-resistant high-shielding wind energy control cable provided by the present utility model, by adding a conductive carbon fiber structure into the conductor 1, the repeated tensile property of the conductor 1 is enhanced, the stress on the tinned copper wires in the conductor 1 is reduced, and the phenomenon of broken cores is avoided. Meanwhile, during the repeated bending of the cable during torsion, the strengthening layer 8 plays a role in tensile resistance, and the inner sheath 7 plays a role in buffering extrusion, increasing the repeated bend resistance of the cable, solving the problem of broken cores after long-term use of the cable, improving the electromagnetic shielding effect of the cable, and ensuring the service life of the cable.

[0036] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments understandable to those skilled in the art.

[0037] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present utility model, and they are not used to limit the protection scope of the present utility model. Any equivalent embodiments or modifications made without departing from the technical spirit of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A wind energy control cable with high bending resistance and high shielding, characterized in that: It includes a plurality of cable cores. Each cable core includes a conductor (1) and a conductor insulation layer (2) coated outside the conductor (1). The conductor (1) is formed by stranding tinned copper wires and conductive carbon fibers. An inner sheath (7), a strengthening layer (8), and an outer sheath (9) are sequentially coated outside the plurality of cable cores. The inner sheath (7) is a silicone rubber inner sheath, the strengthening layer (8) is a fine galvanized steel wire strengthening layer, and the outer sheath (9) is a high-strength polyether-type polyurethane outer sheath.

2. The wind energy control cable with high bending resistance and high shielding according to claim 1, characterized in that: The cross-sectional area of the conductor (1) is 0.75 to 2.5 mm 2 , the conductive carbon fiber is located at the center of a plurality of stranded tinned copper wires, the tensile strength of the conductive carbon fiber is 4 GPa, the diameter of the tinned copper wire is 0.15 mm, and the elongation at break of the tinned copper wire is ≥ 15%.

3. The wind energy control cable with high bending resistance and high shielding according to claim 1, characterized in that: The conductive carbon fibers and tinned copper wires of the conductor (1) are arranged and stranded, and the stranding pitch ratios from the inside to the outside are sequentially controlled to be 18 - 20 times, and the stranding direction is the same-direction stranding.

4. The wind energy control cable with high bending resistance and high shielding according to claim 1, characterized in that: The conductor insulation layer (2) is a high-strength thermoplastic elastomer insulation layer.

5. The wind energy control cable with high bending resistance and high shielding according to claim 1, characterized in that: A first wrapping layer (4) is coated outside the plurality of cable cores. A strengthening filler (3) is arranged inside the first wrapping layer (4) and outside the conductor insulation layer (2). The strengthening filler (3) is a polyester strengthening yarn.

6. The wind energy control cable with high bending resistance and high shielding according to claim 5, characterized in that: A tinned copper wire braiding layer is arranged outside the first wrapping layer (4) and inside the inner sheath (7).

7. The wind energy control cable with high bending resistance and high shielding according to claim 6, characterized in that: A steel-plastic composite tape is arranged outside the tinned copper wire braiding layer and inside the inner sheath (7).

8. The wind energy control cable with high bending resistance and high shielding according to claim 1, characterized in that: There are 6 galvanized steel wires in the strengthening layer (8) and they are evenly wound outside the inner sheath (7).

9. The wind energy control cable with high bending resistance and high shielding according to claim 4, characterized in that: The tensile strength of the high-strength thermoplastic elastomer insulation layer ≥ 15 N / mm 2 , the elongation at break ≥ 300%, and the Shore hardness is 82 HA.

10. The wind energy control cable with high bending resistance and high shielding according to claim 1, characterized in that: The tensile strength of the silicone rubber inner sheath is 8 Mpa, and the elongation at break > 200%; the tensile strength of the high-strength polyether-type polyurethane outer sheath ≥ 30 N / mm 2 , the elongation at break ≥ 300%, and the tear strength ≥ 40 N / mm.

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