CN201166996Y - Torsion resistant rubber sheath flexible cable for wind power generation - Google Patents

Abstract

The utility model relates to a torsion-resistant rubber sleeve flexible cable, in particular to a torsion-resistant rubber sleeve flexible cable used for wind electric power generation; the pitch diameter ratio of a bunched strand of a conducting body is 15 to 18 times, the laying directions on the multiple stranded inner and outer layers of the strand are identical, the pitch diameter ratios of the inter and other layers are identical, the multiple stranded pitch diameter ratio is 8 to 9 times, the outside of a cable core is directly extruded and packaged with a protective sheath, so that the cable core is insulated and is combined into a whole with the protecting sheath. The structure ensures that torsion-resistance capacity of the cable is greatly increased. The one-time positive and negative torsion test is three weeks, the surface of the cable with 3600 times is free from crack, and 2.5 UO withstand voltage can not break down for 5 minutes; low-temperature-resistant rubber is provided and used, the surface of the cable with 500 times is free from crack at the temperature of minus 40 DEG C, 2.5 UO withstand voltage can not break down for 5 minutes, and the external diameter of a cable of the identical specification can be reduced by about 4 percent.

Description

Torsion resistant rubber sheath flexible cable for wind power generation

technical field

The utility model relates to a torsion-resistant rubber-sheathed flexible cable, in particular to a torsion-resistant rubber-sheathed flexible cable for wind power generation.

Background technique

In the design of wind power generation, in order to avoid the disadvantages of frequent wind deflection of major turbines, it is usually to make the turbines yaw with the wind, twist continuously for three weeks, and then rotate and reset again. This requires that the cable connected to the turbine should have good torsion resistance, especially in a low temperature environment such as -40°C, and the mechanical properties of the material will still have excellent twisting properties (the twisting performance will not decrease at low temperatures), so Extremely stringent requirements are placed on the twist resistance of the cable.

Existing rubber-sheathed flexible cables, except that conductors adopt stranded soft conductors, such as 5 and 6 types of thin copper conductors or tinned copper conductors for cables, are bundled into strands first, and then re-twisted to form stranded conductors. The pitch diameter ratio of the strands is usually set at 25 to 30 times. According to the twisting direction of the strands and the re-twisting direction, several strands are re-twisted into a stranded conductor. The inner and outer layers are twisted in opposite directions, and the inner layer has a larger pitch ratio. , 14 to 18 times, the outer pitch diameter ratio is small, 12 to 16 times. The stranded conductor with this structure not only has a relatively large outer diameter, but the bending performance of the resulting stranded conductor is still difficult to meet the torsion resistance requirements of the rubber-sheathed flexible cable for wind power generation. Frequent bending and twisting during use will easily lead to premature breakage of the conductor. Reduced useful life.

Secondly, the existing multi-core rubber-sheathed flexible cable has multiple insulated cores twisted to form a cable with a pitch ratio of 12 to 14 times, and the gap between the twisted insulated cores is filled with fibers or rubber strips, and then the rubber sheath is extruded The sheath is tubular, and the cable core and the sheath are independent and not tight. The single-core cable is completed by one-time co-extrusion of insulation and sheath, or by separate extrusion of insulation and sheath. The cable core and the sheath are independent of each other. When the cable is twisted, the sheath and the cable core will be twisted separately, which will also cause the sheath to be easily damaged and shorten the effective service life.

Due to the defects of the rubber-sheathed flexible cable in the prior art that the conductor structure is still relatively hard, the torsion resistance is not enough, and the cable core and the sheath are independent, the torsion resistance of the cable still cannot meet the requirements of the rubber-sheathed flexible cable for wind power generation. twist request.

The audio digital track circuit connection cable disclosed in Chinese patent CN2929919 adopts the twisting direction of several strand units in each layer to be consistent with the stranding direction of the layer; the pitch diameter ratio of strand unit stranding and layer stranding is It is a 4-20 times structure, and the twisting direction of several strand units in the outermost layer is opposite to the twisting direction of the layer-by-layer twisting direction. Although it adopts the shortened conductor stranding pitch and the same-direction stranding method, which increases the bending performance of the cable to a certain extent, this stranding structure only eliminates the processing residual stress of the conductor during the stranding process. The stress during winding makes the deformation after bending forming small. Actual testing according to this twisted wire structure still cannot meet the torsion resistance requirements of cables for wind power generation.

Chinese patent CN200959251 discloses a shielded control cable for a digital itinerant detection device. Two pairs of cable cores are twisted in the same direction into at least two groups, and then each group of cable cores is reversely twisted into a bundle. It solves the problem of stable signal transmission, which can reliably transmit weak analog and digital signals, but does not actually improve the torsion resistance performance much. Similarly, this structure cannot meet the torsion resistance requirements of wind power cables.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art, and provide a torsion-resistant rubber-sheathed soft cable with strong torsion resistance for wind power generation.

The purpose of the utility model is realized, and the main improvement is to address the defects of the existing technology by reducing the pitch diameter ratio of the strands to 15 to 18 times; Control it at 8-9 times; multi-core cables control the pitch ratio of insulated cores twisted to 8-10 times; and directly extrude the sheath without filling the core gap, three/four technical measures, so as to overcome the current situation. There are technical deficiencies, and the purpose of the utility model is realized. Specifically, the utility model twist-resistant rubber-sheathed soft cable for wind power generation includes thin copper wire strands, multi-twisted flexible conductors, rubber insulation and rubber outer sheath. The pitch ratio of the bundled strands of the conductor is 15 to 18 times, the twist direction of the inner and outer layers of the strands is the same, the ratio of the pitch diameters of the inner and outer layers is the same, the pitch ratio of the strands is 8 to 9 times, and the cable core is directly extruded and protected. Sheath, the cable core insulation and sheath combined into one.

The said cable core of the utility model can be single-core or multi-core as required.

Among them, multi-core cables such as three cores, the insulated cores are stranded and the pitch ratio of the cable is controlled at 8-10 times. After stranded, the gap between the cable cores is not filled, and the outer sheath is directly extruded, and the cable core insulation and sheath are also combined into a One.

The utility model twist-resistant rubber-sheathed soft cable for wind power generation adopts the reduction of the pitch ratio of the strands; the strands are re-twisted and the inner and outer layers are twisted in the same direction, and the inner and outer layer pitch ratios are consistent, and the pitch ratio is controlled at 8~ 9 times; for multi-core cables, control the stranded pitch ratio of insulated cores to 8-10 times; and directly extrude the rubber sheath without filling the core gap, so that the cable core and the sheath are integrated, so that the cable The torsional ability is greatly enhanced. Torsion test, three weeks in front and back, no cracks on the cable surface 3600 times, 2.5U0 pressure resistance for 5 minutes without breakdown; equipped with low temperature resistant rubber, at -40 ° C, 500 times the cable surface has no cracks, 2.5U0 pressure resistance 5 minutes without breakdown. The pitch of the strands of the utility model becomes smaller, which makes the strands distinct, which is more conducive to bending and re-twisting; the twisting direction of the inner and outer layers of the re-twisting is the same (same direction twisting), and the pitch diameter ratio of the inner and outer layers is consistent, and the pitch diameter ratio is reduced. The resulting double-stranded conductor has a small outer diameter (the outer diameter of the same specification is reduced by about 4%), good flexibility, the conductor is easy to bend, and is not easy to break after repeated bending; the small section diameter ratio is cabled, and the required torsion is pre-twisted in the cable core. When twisted, it is gradually released, thereby improving the torsion resistance; the rubber sheath is directly extruded outside the cable core, especially for multi-core cables. The sheath will not loosen, which is beneficial to ensure the integrity of the sheath; in addition, the sheath is directly extruded outside the cable core, the cable surface is rounded, and the outer diameter of the cable is further reduced, which is also conducive to improving the torsion resistance of the cable.

The utility model is further described below in conjunction with two specific embodiments.

Description of drawings

Figure 1 is a schematic cross-sectional structure diagram of a torsion-resistant rubber-sheathed single-core flexible cable for a utility model for wind power generation.

Fig. 2 is a schematic cross-sectional structure diagram of a three-core soft cable with a torsion-resistant rubber sheath for a utility model for wind power generation.

Fig. 3 is a schematic diagram of the utility model stranded conductor structure.

Detailed ways

Embodiment 1: See Figures 1 and 3, a utility model of twist-resistant rubber-sheathed single-core flexible cable for wind power generation, including a cable core composed of a stranded conductor, a tight wrapping tape 4 and a rubber insulation 5, and the rubber sheath is directly extruded outside. Set of 6. Among them, soft and thin copper wire 1 is used for the stranded conductor, and the 5 types of copper conductors or tinned copper conductors for cables are used. First, they are twisted to the right and the pitch diameter ratio is 16 times to form strands 2, and then twisted again according to the strands Twisted to the left (the double twisted direction is opposite to the twisted direction of the strands), and the inner and outer layers are twisted in the same direction, and the pitch diameter ratio (L/D) of the inner and outer layers is 8 times. Belt 4 is fastened, and rubber insulation 5 is extruded, and rubber sheath 6 is extruded simultaneously.

Embodiment 2: Referring to Fig. 2, as in Embodiment 1, the twist-resistant rubber-sheathed three-core flexible cable for utility model wind power generation is composed of three insulated wire cores twisted into a cable core, and the pitch ratio of the cable is 8 times. After twisting, it is directly Squeeze the rubber sheath6.

In addition, the rubber can also use other functional rubbers, such as oil-resistant rubber, flame-retardant rubber, low-temperature rubber, or rubber with oil-resistant, flame-retardant, and low-temperature characteristics at the same time; the cable structure can also be a cable with a control core to meet various occasions. Cable requirements for power generation.

Claims (3)

1. Torsion-resistant rubber-sheathed flexible cables for wind power generation, including fine copper wire strands, multi-twisted flexible conductors, rubber insulation and rubber outer sheaths, in which the twisting direction of the strands is opposite to that of the double-twisting, which is characterized by the conductor's The pitch diameter ratio of bundled strands is 15 to 18 times, the twist direction of the inner and outer layers of the strands is the same, the pitch diameter ratio of the inner and outer layers is the same, and the pitch diameter ratio of the multiple strands is 8 to 9 times, and the sheath is directly extruded outside the cable core, so that The core insulation is integrated with the sheath. 2. The torsion-resistant rubber-sheathed flexible cable for wind power generation according to claim 1, characterized in that the outside of the stranded conductor is tightened by a tape, and then the sheath is extruded. 3. The torsion-resistant rubber-sheathed flexible cable for wind power generation according to claim 1 or 2, characterized in that the pitch ratio of the twisted multi-core cable insulated cores is 8-10 times.

Images