阅读说明：本技术 一种高抗压电力线缆及其制备与应用 (High-compression-resistance power cable and preparation and application thereof ) 是由 曾智 于 2019-09-27 设计创作，主要内容包括：本发明提出了一种高抗压电力线缆,包括由内至外依次套设的电缆芯、绝缘层、抗压过渡层、屏蔽层、防护抗压套,其中,抗压过渡层包括环形过渡套管以及环形阵列设于环形过渡套管与绝缘层间的弧形支撑件,弧形支撑件外弧面与绝缘层外圆侧面相切,弧形支撑件内弧面与环形过渡套管内壁间形成的空腔内填充有抗压缓冲材料；防护抗压套采用含抗压增强骨架的塑料合金,本发明通过对线缆结构和材料双重改进优化,大大提高了线缆的力学性能,抗压强韧性显著提高,同时具有优异的缓冲绝缘性,线缆有效使用寿命延长了2倍以上。(The invention provides a high-compression-resistance electric power cable which comprises a cable core, an insulating layer, a compression-resistance transition layer, a shielding layer and a protective compression-resistance sleeve, wherein the cable core, the insulating layer, the compression-resistance transition layer, the shielding layer and the protective compression-resistance sleeve are sequentially sleeved from inside to outside; the protective compression-resistant sleeve is made of plastic alloy containing a compression-resistant reinforced framework, the cable structure and the material are improved and optimized, the mechanical property of the cable is greatly improved, the compression-resistant strength and toughness are obviously improved, meanwhile, the cable has excellent buffering insulation property, and the effective service life of the cable is prolonged by more than 2 times.)

1. A high resistance to compression power cable which characterized in that: comprises a cable core, an insulating layer, a compression-resistant transition layer, a shielding layer and a protective compression-resistant sleeve which are sleeved from inside to outside in sequence, wherein,

The compression-resistant transition layer comprises an annular transition sleeve and arc-shaped supporting pieces arranged between the annular transition sleeve and the insulating layer in an annular array, the outer arc surface of each arc-shaped supporting piece is tangent to the outer circle side surface of the insulating layer, and a cavity formed between the inner arc surface of each arc-shaped supporting piece and the inner wall of the annular transition sleeve is filled with a compression-resistant buffer material; the protective pressure-resistant sleeve is made of plastic alloy containing a pressure-resistant reinforced framework.

2. The high crush-resistant power cable of claim 1, wherein: the diameter and thickness of the cable core are taken as a measurement basis, and the thickness of the insulating layer, the compression-resistant transition layer, the shielding layer and the protective compression-resistant sleeve accounts for 1.5-3%, 7-15%, 0.5-2% and 10-20% of the measurement basis respectively.

3. the high crush-resistant power cable of claim 1, wherein: the cable core adopts a copper alloy cable or an aluminum alloy cable; the insulating layer adopts fluorosilicone rubber doped with high-porosity modified ore filler; the shielding layer adopts graphite fiber with metallized surface.

4. The high crush-resistant power cable of claim 1, wherein: the annular transition sleeve is made of an HDPE/PET composite material containing modified silicone oil coated glass fibers, wherein the modified silicone oil is silicone oil containing epoxy groups and vinyl groups for co-modification, the addition amount of the modified silicone oil coated glass fibers accounts for 13-17wt% of the total mass of the HDPE/PET composite material, and the mass ratio of the HDPE to the PET in the composite material is 1: 0.5-0.7.

5. the high crush-resistant power cable of claim 1, wherein: the compression-resistant buffer filler is a composition of ceramic micro powder and wood chips, the particle size of the ceramic micro powder is less than 3 mu m, the particle size of the wood chips is less than 10 mu m, and the mass ratio of the ceramic micro powder to the wood chips is 1: 0.5-1.

6. The high crush-resistant power cable of any one of claims 1 to 5, wherein: arc support piece includes big arc and the little arc that the annular array set up, and big arc, the interval setting in turn of little arc, and big arc cambered surface end is tangent with the insulating layer, and its both ends are along linking firmly with annular transition sleeve pipe inner wall, and little arc cambered surface end is tangent with the insulating layer, and its both ends are along linking firmly with big arc extrados, and this arc support piece also adopts the plastic alloy who contains resistance to compression reinforcing skeleton.

7. The high crush-resistant power cable of claim 6, wherein: the plastic alloy containing the compression-resistant reinforced skeleton is prepared by taking fluorine-containing PE as a plastic alloy matrix and taking carbon fiber/glass fiber composite fiber doped with nano oxide as a reinforced skeleton, and the content of the reinforced skeleton accounts for 6-9% of the mass of the alloy matrix.

8. the high crush-resistant power cable of claim 7, wherein: the nano oxide is a composition of nano titanium dioxide and nano silicon dioxide or nano magnesium dioxide, wherein the content of the nano titanium dioxide is not less than 60wt%, and the doping amount of the nano oxide is 8-10wt% of the mass of the carbon fiber/glass fiber composite fiber; in the composite fiber, the carbon fiber content accounts for 25-40 wt%.

9. The high crush-resistant power cable according to claim 8, prepared by the following method:

1) Taking an alloy cable core rod material, carrying out rough drawing and fine drawing in sequence to obtain an alloy monofilament, then carrying out annealing treatment on the alloy monofilament, and carrying out doubling and stranding to obtain an alloy cable core, wherein the doubling operation is 2-4 monofilaments;

2) Taking an insulating layer material, extruding an insulating layer on the outer layer of the pre-alloyed cable core, vulcanizing, drying and degassing to obtain a cable preparation body;

3) Taking a compression-resistant transition layer material, and rolling and coating the compression-resistant transition layer material by taking the cable preparation body as an axis to obtain a cable intermediate;

4) And taking a shielding layer material to wrap the shielding layer, and finally wrapping the protective pressure-resistant sleeve.

10. A high withstand voltage power cable applied to a landfill depth of 1.0-1.5m by the high withstand voltage power cable of claim 9.

Technical Field

The invention relates to the technical field of power cables, in particular to a high-voltage-resistance power cable and preparation and application thereof.

Background

the wire and cable industry is an important matching industry for the economic construction of China and is widely applied to various fields of national economy. The electric wire and cable are essential basic equipment for transmitting electric energy, transmitting information and manufacturing various motors, electric appliances, instruments, automobiles, machine tools and other equipment. With the rapid growth of Chinese economy and the further acceleration of industrialization and urbanization processes, the wire and cable industry in China is rapidly developed in the subdivision industry of the mechanical industry, the production value scale of the wire and cable manufacturing industry accounts for one fourth of the electrical and electronic industry, is the second largest industry in the mechanical industry, which is second to the automobile industry, and occupies an important position in the national economy. In recent years, the progress of the continuous and rapid development of urbanization of economy in China is promoted, and the construction of large-scale power stations, western-to-east power transmission, power grid transformation and other heavy projects indicates that the wire and cable industry has a long prospect period.

The traditional wire cable is made of copper wires coated by outer cable sheaths, and in order to guarantee the safety of power utilization, the insulation and fire prevention of the cable are very important performance indexes. For example, chinese patent No. CN2904218Y discloses a fireproof cable, which comprises a copper core inner conductor, an insulating layer, and a sheath tube, wherein the insulating layer outside the copper core inner conductor is a ceramic magnesium oxide insulating layer, and a stainless steel sheath tube is disposed outside the insulating layer, so as to achieve the purpose of fire prevention through the sheath tube and the insulating layer.

The peripheral protective sleeve is a means adopted by most of cable protection at present, but the material of the cable becomes hard after the protective sleeve is sleeved on the cable, so that the laying of finished cables is influenced. On the contrary, if a rigid protective sleeve is not adopted, the cable is frequently treaded or extruded no matter in the construction process or the subsequent use process, so that the cable is slightly treaded or flattened, and the wire core in the cable is broken, so that the circuit cannot normally work. Therefore, it is necessary to design a cable having excellent compression resistance.

Disclosure of Invention

Aiming at the problems, the invention provides the high-pressure-resistant power cable and the preparation and application thereof, and the mechanical property of the cable is greatly improved by double improvement and optimization of the cable structure and materials, the pressure-resistant toughness and toughness are obviously improved, meanwhile, the cable has excellent buffer insulation property, and the effective service life of the cable is prolonged by more than 2 times.

In order to achieve the above object, the present invention adopts the following technical solutions:

A high pressure-resistant power cable comprises a cable core, an insulating layer, a pressure-resistant transition layer, a shielding layer and a protective pressure-resistant sleeve which are sequentially sleeved from inside to outside,

the compression-resistant transition layer comprises an annular transition sleeve and arc-shaped supporting pieces arranged between the annular transition sleeve and the insulating layer in an annular array, the outer arc surface of each arc-shaped supporting piece is tangent to the outer circle side surface of the insulating layer, and a cavity formed between the inner arc surface of each arc-shaped supporting piece and the inner wall of the annular transition sleeve is filled with a compression-resistant buffer material; the protective pressure-resistant sleeve is made of plastic alloy containing a pressure-resistant reinforced framework.

As a further optimization of the invention, the thickness of the diameter of the cable core is taken as a measurement basis, and the thickness of the insulating layer, the compression-resistant transition layer, the shielding layer and the protective compression-resistant sleeve accounts for 1.5-3%, 7-15%, 0.5-2% and 10-20% of the measurement basis respectively.

As a further optimization of the invention, the cable core adopts a copper alloy cable or an aluminum alloy cable; the insulating layer adopts fluorosilicone rubber doped with high-porosity modified ore filler; the shielding layer adopts graphite fiber with metallized surface.

As further optimization of the invention, the annular transition sleeve is made of an HDPE/PET composite material containing modified silicone oil coated glass fibers, wherein the modified silicone oil is silicone oil containing epoxy groups and vinyl groups for co-modification, the addition amount of the modified silicone oil coated glass fibers accounts for 13-17wt% of the total mass of the HDPE/PET composite material, and the mass ratio of HDPE to PET in the composite material is 1: 0.5-0.7.

As a further optimization of the invention, the compression-resistant buffer filler is a composition of ceramic micro powder and wood chips, the particle size of the ceramic micro powder is less than 3 mu m, the particle size of the wood chips is less than 10 mu m, and the mass ratio of the ceramic micro powder to the wood chips is 1: 0.5-1.

As a further optimization of the invention, the arc-shaped supporting piece comprises large arc-shaped plates and small arc-shaped plates which are arranged in an annular array, the large arc-shaped plates and the small arc-shaped plates are alternately arranged at intervals, the arc surface end of the large arc-shaped plate is tangent to the insulating layer, the two ends of the large arc-shaped plate are fixedly connected with the inner wall of the annular transition sleeve, the arc surface end of the small arc-shaped plate is tangent to the insulating layer, the two ends of the small arc-shaped plate are fixedly connected with the outer arc surface of the large arc-shaped plate, and the arc.

As further optimization of the invention, the plastic alloy containing the compressive reinforcement framework is prepared by taking fluorine-containing PE as a plastic alloy matrix and taking carbon fiber/glass fiber composite fiber doped with nano oxide as a reinforcement framework, and the content of the reinforcement framework accounts for 6-9% of the mass of the alloy matrix.

as a further optimization of the invention, the nano oxide is a composition of nano titanium dioxide and nano silicon dioxide or nano magnesium dioxide, wherein the content of the nano titanium dioxide is not less than 60wt%, and the doping amount of the nano oxide is 8-10wt% of the mass of the carbon fiber/glass fiber composite fiber; in the composite fiber, the carbon fiber content accounts for 25-40 wt%.

The preparation method of the high-pressure-resistant power cable comprises the following steps:

1) Taking an alloy cable core rod material, carrying out rough drawing and fine drawing in sequence to obtain an alloy monofilament, then carrying out annealing treatment on the alloy monofilament, and carrying out doubling and stranding to obtain an alloy cable core, wherein the doubling operation is 2-4 monofilaments;

2) taking an insulating layer material, extruding an insulating layer on the outer layer of the pre-alloyed cable core, vulcanizing, drying and degassing to obtain a cable preparation body;

3) Taking a compression-resistant transition layer material, and rolling and coating the compression-resistant transition layer material by taking the cable preparation body as an axis to obtain a cable intermediate;

4) And taking a shielding layer material to wrap the shielding layer, and finally wrapping the protective pressure-resistant sleeve.

The high-pressure-resistant power cable prepared by the preparation method is applied to the landfill depth of 1.0-1.5 m.

Due to the adoption of the technical scheme, the invention has the beneficial effects that: through the double improvement and optimization of the cable structure and materials, the mechanical property of the cable is greatly improved, the compression-resistant toughness is obviously improved, meanwhile, the cable has excellent buffer insulation property, and the effective service life of the cable is prolonged by more than 2 times.

the pressure-resistant transition layer is arranged between the cable insulating layer and the shielding layer, the arch-shaped plate is used as a stress supporting frame, the pressure-bearing performance is effectively improved, the arch-shaped plate is divided into two arcs, the stress dispersion is good, the uniformity and the stability are strong, in addition, the pressure-resistant buffer material is filled in an inner cavity formed by the arch-shaped plate, good buffering, insulation and heat resistance are provided, the ceramic micro powder has smaller particle size, the ceramic micro powder is dispersedly filled in the wood chips and is easy to be in electrostatic conduction and matched with the wood chips, the protection performance of the current overflow and leakage of the inner cable core is effectively improved, and the safety protection performance.

As the main protection stress part of the power cable, a compressive reinforcement framework is embedded in the arc-shaped supporting piece and the protective compressive sleeve, so that the compressive strength is further improved, the framework takes plastic alloy as a matrix, reinforced filler is doped, the synergistic effect, the strong hardness and the flexibility are obviously improved, the plastic alloy matrix is favorable for fusion bonding between layers, the stripping resistance between cable layers is good, the network cross-linked winding structure has an excellent promoting effect on the structural stability, and meanwhile, the connection and the conduction of active groups or free ions on the interface between layers are also excellent, so that the stability of the structural performance is greatly improved, and the efficiency period is obviously prolonged.

The improved power cable has improved physical and chemical properties, and has obviously improved tensile strength, insulativity, toughness and effective service life, good application and popularization performance and strong comprehensive practicability compared with the existing power cable.

Drawings

FIG. 1 is a schematic diagram of a power cable according to the present invention;

FIG. 2 is a flow chart of the preparation process of the present invention;

In the figure: the cable comprises a cable core 1, an insulating layer 2, a compression-resistant transition layer 3, an annular transition sleeve 31, a 32 arc-shaped support piece, a large arc-shaped plate 321, a small arc-shaped plate 322, a compression-resistant buffer material 33, a shielding layer 4 and a protective compression-resistant sleeve 5.

Detailed Description

in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.