Search

CN-122000120-A - High-flexibility torsion-resistant control cable for wind power generation system

CN122000120ACN 122000120 ACN122000120 ACN 122000120ACN-122000120-A

Abstract

The invention discloses a high-flexibility torsion-resistant control cable for a wind power generation system, belongs to the technical field of torsion-resistant cables, and is used for solving the technical problems that the flexibility and the reciprocating torsion-resistant cycle life of the control cable facing the working condition characteristics of the wind power generation system in the prior art are required to be further improved in a wide temperature range from low temperature to high temperature. According to the invention, after the multi-strand annealed soft copper conductor is matched with the SZ cable, a non-woven fabric layer, a woven layer, an inner sheath layer, a torsion-resistant layer and an outer sheath layer are sequentially arranged outside a wire core, so that the crack resistance and the wide-temperature-range stability of a cable material are improved, the high flexibility and the high torsion-resistant service life are both considered under the working condition of-40 ℃ to 105 ℃, and the bending rigidity is kept in a controllable window.

Inventors

  • ZENG ZHAOLONG
  • YANG QINGYI
  • Peng Yongdi

Assignees

  • 南方一线(广东)科技有限公司

Dates

Publication Date
20260508
Application Date
20260306

Claims (10)

  1. 1. The high-flexibility torsion-resistant control cable for the wind power generation system is characterized by comprising a wire core, a non-woven fabric layer, a braiding layer, an inner sheath layer, a torsion-resistant layer and an outer sheath layer, wherein the non-woven fabric layer, the braiding layer, the inner sheath layer, the torsion-resistant layer and the outer sheath layer are sequentially coated outside the wire core; The cable comprises a cable body and is characterized in that the cable core comprises at least one central core wire and a plurality of peripheral core wires, wherein the central core wire is arranged at the central position of the cable, and the plurality of peripheral core wires are arranged around the central core wire.
  2. 2. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the conductors of the central core wire and/or the peripheral core wire are stranded conductors of annealed soft copper wires or tinned annealed soft copper wires, the diameter of a single wire is 0.15-0.25mm, an insulating layer is arranged on the periphery of the conductors of the central core wire and/or the peripheral core wire, the insulating layer is made of one or more of thermoplastic polyurethane TPU, thermoplastic elastomer TPEE, crosslinked polyethylene XLPE or polyvinyl chloride PVC, and the insulating layer is formed by extrusion coating.
  3. 3. A highly flexible torsion resistant control cable for a wind energy power generation system according to claim 1 wherein a plurality of said peripheral and central core wires are cabled in SZ cabling with a lay length of 12-20 times the outer diameter of the cable to reduce torsional stress concentrations and increase reciprocation torsion resistance life.
  4. 4. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the non-woven fabric layer is a polyester PET non-woven fabric, a polypropylene PP non-woven fabric or an aramid non-woven fabric, and the non-woven fabric layer is formed by spiral lap-lapping and wrapping, and the lap-lapping rate is 10-50%.
  5. 5. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the braid is formed by braiding one or more of polyester fibers, aramid fibers and metal wires, and the braiding coverage rate of the braid is 90-98% and the braiding angle is 30-40 °.
  6. 6. A highly flexible torsion resistant control cable for a wind energy generation system according to claim 1 wherein the inner jacket layer material is one or more of TPU, TPEE, PVC and the inner jacket layer is extrusion overmolded.
  7. 7. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the torsion-resistant layer is composed of at least two torsion-resistant sublayers, the two torsion-resistant sublayers are spirally wrapped or braided in opposite directions, the torsion-resistant sublayers are made of one or more of aramid fiber tows, ultra-high molecular weight polyethylene fiber tows, high-strength polyester fiber tows or stainless steel wires/tinned copper wires, and the wrapping angle of the torsion-resistant sublayers is 40-60 degrees.
  8. 8. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the outer sheath layer material consists of TPU, activated silicone rubber powder, an accelerator and an auxiliary additive in a weight ratio of 70-80:30-40:1-2:3-4, the accelerator is 2-methylimidazole, the auxiliary additive consists of pigment, lubricant, dispersing agent, plasticizer, heat stabilizer and anti-aging agent in a weight ratio of 5:2:3:2:3:3, the pigment is pigment carbon black, the lubricant is ethylene bis-stearamide, the dispersing agent is stearate, the plasticizer is phthalate, the heat stabilizer is triethyl phosphite, the anti-aging agent is anti-aging agent AW, and the outer sheath layer is molded by extrusion coating.
  9. 9. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the silicone rubber is crushed into silicone rubber powder with a particle size of 50-100nm, then the silicone rubber powder, absolute ethyl alcohol and KH-560 are mixed, the reaction system is heated to 50-60 ℃, alkali liquor is added into the reaction system, the reaction is carried out for 60-80min under heat preservation, and the activated silicone rubber powder is obtained after post-treatment.
  10. 10. The high-flexibility torsion-resistant control cable for a wind power generation system according to claim 1, wherein the dosage ratio of the silicone rubber powder to the absolute ethyl alcohol to the KH-560 to the alkali solution is 7g to 50mL to 2.1 to 2.5g to 10mL, the alkali solution is2 to 3mol/L sodium hydroxide solution, the post-treatment comprises the steps of cooling the reaction system to room temperature after the reaction is completed, suction filtering, washing a filter cake to be neutral by purified water, pumping the filter cake, transferring the filter cake into a drying box with the temperature of 60 to 70 ℃, and vacuum drying the filter cake to constant weight to obtain the activated silicone rubber powder.

Description

High-flexibility torsion-resistant control cable for wind power generation system Technical Field The invention relates to the technical field of torsion-resistant cables, in particular to a high-flexibility torsion-resistant control cable for a wind power generation system. Background In the running process of the wind power generation system, the nacelle yaw, the pitch control, the lifting in the tower and the relative movement between the nacelle and the tower can lead the follow-up cable to bear continuous bending, torsion and the coupling action of the nacelle and the tower in a longer service period. Particularly in a yaw system, the cable is always in a reciprocating torsion working condition, the torsion angle is large, the circulation times are high, and a high-frequency torsion and rebound load spectrum is more easily formed when the wind condition changes and the wind condition is frequently started and stopped. Meanwhile, the wind turbine generator is mostly arranged in environments such as high and cold, high sea and the like, and the cable needs to keep stable mechanical and electrical properties under the action of environmental factors such as low temperature, damp heat and the like. The conventional flexible control cable for wind power generally adopts stranded conductors and thermoplastic or cross-linked materials as insulation and sheaths so as to meet certain bending performance and basic electrical requirements. However, under the special reciprocating torsion-resistant scene of wind power, if the cable core cabling mode and the twisting structure lack torque balance design, long-term reciprocating torsion can generate directional memory and residual torque accumulation, so that permanent kinking, core relative displacement accumulation, loose structure or local geometric rearrangement of the cable occur, and further fatigue failure such as conductor broken wire, insulation shear crack and the like is caused; the cable core and the outer layer constraint structure are lack of effective interface buffering and decoupling, relative sliding between layers in the twisting process brings friction abrasion and heating, abrasion marks or crack starting points are easily formed on the inner surface of the insulation and sheath, and the crack starting points are more easily generated particularly under the condition of low-temperature hardening, and the traditional braiding layers or reinforcing layers are limited in inhibiting capability on section distortion and outer diameter change during reciprocating twisting, so that local stress concentration and poor torsion-resistant service life consistency are caused if coverage rate is insufficient and angle matching is unreasonable, and part of cables adopt a higher-hardness sheath or a thicker reinforcing layer for improving abrasion resistance or strength, so that the surface abrasion resistance can be improved, but bending rigidity is increased, follow-up performance is reduced, larger additional stress is generated under dynamic working conditions, fatigue damage is accelerated, performance fluctuation of sheath materials under wide-temperature range is more obvious, brittle and cracking is easy to occur at low temperature, and creep deformation is easy to occur under high temperature, so that after outer layer protection is failed or water vapor is invaded, interlayer is aggravated, and the service life of the cable is further shortened. In order to improve the torsion resistance, the prior art also has the proposal of improving the structure constraint capability by increasing the number of reinforcing layers, improving the weaving density, adopting the modes of reinforcing high-strength fibers or metal wires, thickening a sheath and the like, but the excessively strong or excessively thick reinforcing layers can obviously improve the bending rigidity and cause follow-up difficulty, the excessively weak reinforcing layers can hardly inhibit torsion deformation accumulation, the contradiction of torsion resistance and flexibility and difficulty in compromise exists, and in addition, even if the high-strength fiber wrapping is adopted, the problems of incapability of effectively counteracting torque and bias of structural directivity can still occur if a symmetrical return path under positive and negative torsion is not formed, and the stable and reliable torsion resistance service life is difficult to maintain under the condition of high-cycle reciprocating torsion. Meanwhile, if the outer sheath lacks a material design for fatigue crack growth and environmental aging, even if the internal structure is enhanced, the outer sheath may crack earlier to cause interlocking failure. Therefore, there is an urgent need for a high-flexibility torsion-resistant control cable structure and material system for the working condition characteristics of a wind power generation system, which are cooperatively designed in the aspects of a cabling mode, an int