CN203300238U - Flexible cable specialized for wind power generation - Google Patents

Abstract

The utility model discloses a special flexible cable for wind power generation, which comprises an outer protective layer and three wire cores wrapped in the outer protective layer. The outer protective layer is composed of a polyether type thermoplastic polyurethane compound sheath and a wrapping tape from the outside to the inside. , each wire core is composed of ethylene-propylene rubber-type elastomer insulation layer wrapped conductor, which is characterized in that the conductor is twisted by several tinned annealed copper wire bundles, and a shield is provided between the sheath and the wire core The shielding layer has a three-layer structure, the inner layer is an aluminum-magnesium alloy wire, the middle layer is an aluminum-plastic composite film, and the outer layer is an iron-nickel alloy strip. Preferably, two high-strength steel wires are arranged parallel to each other and arranged along the longitudinal direction of the cable at the central position of the wall thickness of the sheath. The utility model is characterized in that it not only has better strength, is not easy to break the core, and is not easy to generate electromagnetic interference.

Description

Special flexible cable for wind power generation

technical field

The utility model belongs to the technical field of cables, in particular to a special flexible cable for wind power generation.

Background technique

Wind energy cables are mainly used for connecting wires of wind turbines. The operating environment is very harsh. They must not only have excellent electrical properties and torsion resistance, but also have excellent wear resistance, cold resistance, oil resistance, water resistance, aging resistance, high water resistance, and moisture permeability. , windproof, weather aging resistance, antibacterial, mildew-proof, environmental protection and other characteristics. At present, the flexible cables used in wind turbines are mostly ordinary flexible cables, which cannot fully meet the harsh requirements of the cable environment, and are prone to quality problems such as broken cores and cracks. The service life of the cables is short, which affects the efficiency of the fan system. Therefore, the research and development of torsion-resistant soft cables for wind power generation and the promotion of their specialization and serialization to ensure the long-term stable operation of wind power cables have positive significance for social progress and economic development prospects. For this reason, Chinese patent CN201220289504.6 discloses a torsion-resistant flexible cable for wind power generation, including an outer protective layer and three wire cores wrapped in the outer protective layer; the outer protective layer is made of polyether thermoplastic polyurethane from the outside to the inside. Composed of compound sheath and tape; each core is composed of ethylene propylene rubber type elastomer insulation layer wrapped conductor. The advantage of this technical solution is that through the improvement of the structural design and material selection of the cable, the torsion resistance, weather resistance, low temperature resistance and corrosion resistance of the cable are improved, the safety of the cable is enhanced, and the safety of the cable is improved. service life. However, there is also an obvious disadvantage, namely: insufficient strength, easy to break the core, and sometimes electromagnetic interference will be generated when it is actually used in electronic equipment.

Utility model content

The purpose of the utility model is to provide a special flexible cable for wind power generation with a new structure, which not only has better strength, is not easy to break the core, and is not easy to generate electromagnetic interference.

To achieve this purpose, the technical solution of the present utility model is: a special flexible cable for wind power generation, including an outer protective layer and three wire cores wrapped in the outer protective layer, and the outer protective layer is made of polyether type Composed of thermoplastic polyurethane compound sheath and tape, each wire core is composed of ethylene-propylene rubber type elastomer insulation layer wrapped conductor, the conductor is twisted by several tinned annealed copper wire bundles, the sheath and wire core There is a shielding layer between them, and the shielding layer has a three-layer structure, the inner layer is an aluminum-magnesium alloy wire, the middle layer is an aluminum-plastic composite film, and the outer layer is an iron-nickel alloy strip.

Preferably, two high-strength steel wires are arranged parallel to each other and arranged along the longitudinal direction of the cable at the central position of the wall thickness of the sheath.

Preferably, there is synthetic fiber filler in the space between the outer protective layer and the wire core.

Preferably, an aramid braided torsion-resistant layer is further provided between the polyether thermoplastic polyurethane compound sheath and the strap.

Compared with the prior art, the filling core of the utility model adopts aramid yarn with small elongation, high tensile strength, good flexibility, no combustion, corrosion resistance and low linear density, which has small elongation and high tensile strength in the cable In the case of stress, it protects the cable and ensures the transmission quality of the cable. The aramid yarn is stranded and filled into the gap of the cable, which improves the breaking force of the cable and stabilizes the structure of the cable. Transmission in a special environment, the quality is more stable. In the center of the wall thickness of the sheath, a tensile member composed of two high-strength steel wires placed in parallel is arranged, which helps to improve the strength of the cable and can correctly protect the core when the cable is subjected to a large tensile force. The three-layer composite shielding structure of aluminum-magnesium alloy wire, aluminum-plastic composite film and iron-nickel alloy tape is used, and the aluminum-magnesium alloy is placed in the innermost layer. Using its weak magnetic properties and low density, it will not cause interference and effectively reduce cable stress. Weight, and the iron-nickel alloy strip is a strong magnetic material, which can effectively overcome the interference of strong magnetic fields. The aluminum-plastic composite film as the middle layer can effectively shield on the one hand, and isolate the aluminum-magnesium alloy wire from the iron on the other hand. The nickel alloy strip prevents the coupling effect between the two, interacts with each other and offsets the magnetic shielding, which greatly improves the anti-electromagnetic pulse performance of the utility model.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the utility model.

Among them: 1 is the conductor; 2 is the ethylene-propylene rubber type elastomer insulating layer; 3 is the synthetic fiber filler; 4 is the tape; 5 is the polyether thermoplastic polyurethane compound sheath; 6 is the shielding layer.

Detailed ways

The utility model is further described below in conjunction with embodiment with reference to accompanying drawing.

As shown in Figure 1, a special flexible cable for wind power generation includes an outer protective layer and three wire cores wrapped in the outer protective layer, and the outer protective layer is sheathed and wrapped by a polyether thermoplastic polyurethane compound Composition, each wire core is composed of ethylene-propylene rubber type elastomer insulation layer wrapped conductor, the conductor is twisted by several tinned annealed copper wire bundles, a shielding layer is provided between the sheath and the wire core, so The shielding layer has a three-layer structure, the inner layer is an aluminum-magnesium alloy wire, the middle layer is an aluminum-plastic composite film, and the outer layer is an iron-nickel alloy strip. Wherein, two high-strength steel wires parallel to each other and arranged along the longitudinal direction of the cable are arranged at the central position of the wall thickness of the sheath; there is a synthetic fiber filler in the gap between the outer protective layer and the wire core; the polyether There is also an aramid braided torsion layer between the thermoplastic polyurethane compound sheath and the tape.

This utility model is mainly aimed at the improvement of the flexible cable structure for wind power generation. The above is only a preferred embodiment of the utility model, and it does not limit the patent scope of the utility model. The simple changes and equivalent transformations of the content should be included in the patent scope of the present utility model.

Claims (4)

1. wind power generation Special flexible cable; comprise external protection and be wrapped in three cores in external protection; described external protection is comprised of polyether-type thermoplastic polyurethane compound sheath and band from outside to inside; every core is comprised of the elastic body insulated layer parcel of ethylene-propylene rubber type conductor; it is characterized in that; described conductor adopts some stranded the forming of tin annealed copper wire bundle; between described sheath and core, be provided with screen; described screen is three-decker; internal layer is aluminum-magnesium alloy wire; intermediate layer is plastic-aluminum combined film, and skin is the iron-nickel alloy band.

2. wind power generation Special flexible cable according to claim 1, is characterized in that, described sheath wall thickness middle position is provided with two high-tensile steel wires that are parallel to each other and arrange along the cable longitudinal direction.

3. wind power generation Special flexible cable according to claim 1, is characterized in that the synthetic fibers filler is arranged in the space between described external protection and core.

4. wind power generation Special flexible cable according to claim 3, is characterized in that, between described polyether-type thermoplastic polyurethane compound sheath and band, also is provided with the anti-layer of turning round of an aramid fiber braiding.