CN212434323U

CN212434323U - Power cable for nuclear power ship

Info

Publication number: CN212434323U
Application number: CN202021218128.2U
Authority: CN
Inventors: 王丽萍; 李斌; 金华东; 雷亚清; 程强
Original assignee: Jiangsu Shangshang Cable Group Co Ltd
Current assignee: Jiangsu Shangshang Cable Group Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-29
Anticipated expiration: 2030-06-28

Abstract

A nuclear power ship power cable is formed by sequentially wrapping a wrapping layer and an outer protective layer outside a cable core; the cable core is formed by twisting a plurality of wire cores and a plurality of filling strips; the wire core is formed by wrapping an insulating layer outside a conductor; the conductor is formed by twisting annealed soft round copper monofilaments, and the twisting direction of the copper monofilaments is left; the insulating layer is made of soft low-smoke halogen-free flame-retardant radiation-resistant ethylene propylene rubber insulating material; the wire core and the filling strip are of a common right-handed twisted structure; the filling strip is formed by wrapping flame-retardant EVA materials outside aramid fibers; the radial section of the filling strip is oval; the wrapping layer is formed by left-handed wrapping of thin non-woven fabric; the outer protective layer is made of radiation-resistant thermosetting low-smoke halogen-free flame-retardant EVA materials. The cable has the advantages of good bending resistance, nuclear radiation resistance, light weight, good flame retardant property and long service life.

Description

Power cable for nuclear power ship

Technical Field

The utility model relates to a power cable, in particular to power cable for nuclear power naval vessel is applicable to rated voltage 0.6/1 kV's power cable, belongs to cable technical field.

Background

The cable used for power transmission on the ship in the past needs a flexible cable for connecting power equipment, and the cable is often bent at a large angle when being laid. The space on the ship body is narrow, and the risk that the cable spreads the fire source is very large when a fire disaster happens. Since nuclear powered ships generate electricity using nuclear energy, cables for power transmission connection need to withstand radiation of β, γ, or the like for a long period of time.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

To nuclear power naval vessel power cable's the actual requirement condition, the utility model discloses the cable is on the basis that possesses basic electrical property and the mechanical properties of cable itself, and the problem that needs to solve emphatically mainly has:

in order to ensure that the cable can still work normally under nuclear radiation, the insulating layer and the outer protective layer are required to have radiation resistance;

in order to prevent the spread of fire, the composition structure of the cable is required to have low-smoke halogen-free flame retardant performance;

in order to avoid frequent replacement of the cable, it is necessary to increase the service life of the cable (mainly the service life of the insulation structure).

In order to be suitable for bending and laying more corners, the bending radius of the cable in use needs to be reduced, and the flexibility of the cable is enhanced.

Technical scheme adopted for solving the technical problems

In order to achieve the technical purpose, the utility model adopts the following technical scheme:

a nuclear power ship power cable is structurally formed by sequentially wrapping a wrapping layer and an outer protective layer outside a cable core;

the cable core is formed by twisting a plurality of wire cores and a plurality of filling strips;

the wire core is formed by wrapping an insulating layer outside a conductor; the diameter range of the conductor is 0.9 mm-2.08 mm; the conductor is formed by twisting annealed soft round copper monofilaments, the ratio of the twisting pitch diameter of the copper monofilaments ranges from 20 to 25, and the twisting direction of the copper monofilaments is in the left direction; the diameter range of the copper monofilament is 0.15 mm-0.20 mm; the thickness of the insulating layer is 0.63-0.77 mm; the insulating layer is made of soft low-smoke halogen-free flame-retardant radiation-resistant ethylene propylene rubber insulating material;

the wire core and the filling strip are of a common right-handed twisting structure, and the twisting pitch-diameter ratio ranges from 20 to 40;

the filling strip is formed by wrapping flame-retardant EVA materials outside aramid fibers; the radial cross section of the filler rod is elliptical. The shape enables the side gaps of 2-5 core cables to be easily filled, the roundness of the cables is improved, and the risk that circular filling protrudes out to form a cable circle is avoided. The elliptical filling is closer to the shape of a side gap, the extrusion difficulty is far smaller than that of special-shaped filling, and the filling shape is an ideal filling shape of a power cable (mostly 2-5 wire cores).

The wrapping layer is formed by left-handed wrapping of thin non-woven fabric; the thickness range of the thin non-woven fabric is 0.09-1.01 mm; the lapping rate range is 20-25%

The outer protective layer is made of radiation-resistant thermosetting low-smoke halogen-free flame-retardant EVA materials; the nominal thickness of the outer protective layer is 1.2-1.8 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.

In this example, the insulating layer is an extruded structure, the nominal thickness of the insulating layer is 0.7mm, and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value.

The filling strips are formed by arranging a plurality of aramid fibers in parallel, and flame-retardant EVA materials are filled outside the aramid fibers and between the aramid fibers. The flame-retardant EVA material can be obtained by extruding aramid fiber filaments by an extruder and then extruding the aramid fiber filaments by an extrusion die.

The power cable for the nuclear power ship adopts a plurality of strands of fine soft annealed copper wire stranded conductors, soft low-smoke halogen-free flame-retardant radiation-resistant ethylene propylene rubber insulation, soft flame-retardant EVA filling, radiation-resistant thermosetting low-smoke halogen-free flame-retardant EVA sheaths and the like on the premise of meeting basic requirements such as cable electrical performance and the like. On the premise of adopting the radiation-resistant and long-life insulating sheath material to improve the service life and the radiation-resistant performance of the cable, the relevant structures are softer, and the bending performance of the cable is improved.

Advantageous effects

After the technical scheme is adopted, the utility model discloses following beneficial effect has:

(1) the cable structure has simple and reasonable design: the complex wrapping structure in the conventional cable structure is reduced, the bending radius in the bending direction is reduced, and the cable is easier to bend.

(2) The pitch range of the stranded annealed soft copper conductor is controlled, so that the conductor structure can keep the soft characteristic and cannot be loosened. The cable is suitable for the occasion of small bending laying.

(3) The low-smoke halogen-free flame-retardant insulating, filling and sheath materials are used, so that the whole cable meets the low-smoke halogen-free flame-retardant performance, and the fire disaster is prevented from spreading due to the cable.

(4) The outer protective layer uses the insulation and sheath structure with radiation resistance and long service life, so that the service life and the radiation resistance of the cable are improved.

(5) Conventional stuffer cords are formed of a collection of thin, round elastomeric materials that are then twisted together with the core. Under this structure, the density of packing rope is higher, and its function only is the circularity that improves the cable.

The filling rope of the cable not only improves the roundness of the cable, but also more importantly, the aramid fiber is wrapped by the flame-retardant EVA material to obtain the single filling rope with the elliptic section. The aramid fiber wire is utilized to ensure the tensile property of the cable, and the flame-retardant EVA material has elasticity, so that the bending property of the cable is improved. The flame-retardant EVA material has high flame-retardant performance, and can further improve the flame-retardant performance of the cable. The oval section of the filling rope is suitable for being filled outside the wire core in structure to obtain a cable core close to a perfect circle, and the wrapping tape is combined to enable the roundness of the cable core to be high. When the outer protective layer is wrapped, the cable with high roundness is finally obtained through the extrusion die of the outer breathing layer.

The utility model discloses the cable has used high-quality material and specific structural parameter in order to reach the life of extension cable simultaneously on the basis of new design cable shape structure, and the cable can be used on nuclear power warship ship or in other nuclear power station similar environment.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a filler strip;

in the figure: 1. a conductor; 2. an insulating layer; 3. filling the strip; 4. wrapping a covering; 5. an outer jacket; 6. a flame-retardant EVA material; 7. a flame-retardant EVA material.

Detailed Description

As shown in fig. 1, the power cable for a nuclear-powered ship of the present embodiment has a structure in which: the cable is formed by sequentially wrapping a wrapping layer and an outer protective layer outside a cable core;

the cable core is formed by twisting a plurality of wire cores and a plurality of filling strips; typically 3-5, in this case 3.

The wire core is formed by wrapping an insulating layer outside a conductor; the diameter range of the conductor is 0.9 mm-2.08 mm; the conductor is formed by twisting annealed soft round copper monofilaments, the ratio of the twisting pitch diameter of the copper monofilaments ranges from 20 to 25, and the twisting direction of the copper monofilaments is in the left direction; the diameter range of the copper monofilament is 0.15 mm-0.20 mm; the thickness of the insulating layer is 0.63-0.77 mm; the insulating layer is made of soft low-smoke halogen-free flame-retardant radiation-resistant ethylene propylene rubber insulating material; in this example, the insulation material is selected from XJ-33 HB-3.

as shown in fig. 2, the filling strip is made of aramid fiber filament wrapped with flame-retardant EVA material; the radial section of the filling strip is oval; the shape enables the side gaps of 2-5 core cables to be easily filled, the roundness of the cables is improved, and the risk that circular filling protrudes out to form a cable circle is avoided. The elliptical filling is closer to the shape of the side gap, the extrusion difficulty is far less than that of special-shaped filling, and the filling shape is an ideal filling shape of the power cable. The filling strip is obtained by arranging a plurality of aramid fibers in parallel, filling flame-retardant EVA materials outside the aramid fibers and among the aramid fibers and extruding the aramid fibers through an extrusion die.

The outer protective layer is made of radiation-resistant thermosetting low-smoke halogen-free flame-retardant EVA material, and in the example, the grade of the protective layer material is XH-33 HB-6; the nominal thickness of the outer protective layer is 1.2-1.8 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.

The utility model discloses the cable has following advantage: 1. the bending resistance is good; 2. nuclear radiation resistance; 3. the weight is light; 4. the flame retardant property is good; 5. the service life is long.

After the scheme is adopted, the service life of the cable reaches more than 40 years, the bending performance is good, the irradiation resistance is good, the processing performance is good, and the production efficiency can be effectively improved. And simultaneously meets the basic requirements of electrical and mechanical properties.

The cable of this example can be subjected to the following tests, the test result being a pass.

Claims

1. A power cable for nuclear power ships is characterized in that a cable core is sequentially wrapped with a wrapping layer and an outer protective layer;

the filling strip is formed by wrapping flame-retardant EVA materials outside aramid fibers; the radial section of the filling strip is oval;

the wrapping layer is formed by left-handed wrapping of thin non-woven fabric; the thickness range of the thin non-woven fabric is 0.09-1.01 mm; the lapping rate range is 20-25%;

2. The power cable for nuclear powered ships according to claim 1, wherein the insulating layer is of an extruded structure, the insulating layer has a nominal thickness of 0.7mm, and the thinnest point thickness is not less than 90-0.1 mm of the nominal value.

3. The power cable for nuclear powered ships according to claim 1, wherein the filler strip is formed by arranging a plurality of aramid filaments in parallel, filling a flame-retardant EVA material outside the aramid filaments and between the aramid filaments, and extruding the mixture through an extrusion die.