CN223501595U

CN223501595U - A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable

Info

Publication number: CN223501595U
Application number: CN202422945771.XU
Authority: CN
Inventors: 王丽; 陈楠; 陈文龙; 彭永领; 高国彪; 张鹏飞; 雷俊霞; 唐建军; 韩兵; 陈建新; 张奇; 余鑫
Original assignee: SIAIT CABLE CO Ltd
Current assignee: SIAIT CABLE CO Ltd
Priority date: 2024-12-02
Filing date: 2024-12-02
Publication date: 2025-10-31
Anticipated expiration: 2034-12-02

Abstract

This utility model relates to the field of characteristic cable technology, specifically to a halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable, comprising: a cable core, the cable core being composed of several conductors; the conductors being sequentially covered by a first insulation layer, a second insulation layer, and a third insulation layer; a flame-retardant layer, overlapping and wrapped around the outside of the cable core, the flame-retardant layer containing flame-retardant filler in the gaps between the cable cores; an inner protective layer; an extruded layer on the outside of the flame-retardant layer; an armor layer; a composite braid covering the outside of the inner protective layer; and an outer protective layer, extruded on the outside of the armor layer. It possesses excellent electrical and mechanical properties such as aging resistance, bending resistance, hot oil resistance, high temperature resistance, high radiation resistance, long lifespan, high flame retardancy, tear resistance, resistance to strong electromagnetic interference, lightweight, low smoke, halogen-free, and low toxicity, meeting the special 1E-class operating environment of nuclear power plants on ships.

Description

Halogen-free low-smoke low-toxicity long-service-life light-weight power cable

Technical Field

The utility model relates to the technical field of characteristic cables, in particular to a halogen-free low-smoke low-toxicity long-service-life light-weight power cable.

Background

The power cable for the ship is specially designed for the environment of offshore floating buildings such as warships, river and sea ships, offshore oil platforms and the like, and is used for power and energy transmission of equipment, instruments and meters. The cable needs to have excellent electrical properties, aging resistance, bending resistance, long life, tear strength, hot oil resistance, high flame retardance, strong fire resistance, low smoke zero halogen characteristics, and low toxicity to ensure that excellent electrical and mechanical properties are maintained in severe environments.

However, the power cable of the marine nuclear power station for electric energy transmission in the market at present is relatively deficient, and the cable for the civil nuclear power station is mainly relied on for replacement. Although the cable can meet the severe environmental conditions of high temperature, high radiation, strong electromagnetic interference and the like of a nuclear power station, the performance of the cable is difficult to meet the requirements in the ship application environment, such as conditions of narrow space, limited load, easiness in corrosion by seawater and greasy dirt, strong sun exposure and the like.

In addition, in recent years, the technological level of aluminum alloy conductors is improved, so that the electric performance and mechanical performance of the aluminum alloy conductors are close to those of copper conductors, and the weight of the aluminum alloy conductors is only 1/3 of that of the copper conductors. Therefore, the high-strength high-conductivity aluminum alloy conductor can be used as an excellent substitute for a copper conductor.

In order to solve the problems, a 1E-level halogen-free low-smoke low-toxicity high-service-life light power cable for a marine nuclear power station is provided.

Disclosure of utility model

The halogen-free low-smoke low-toxicity long-service-life light-weight power cable comprises a cable core, wherein the cable core is composed of a plurality of conductors, a first insulating layer, a second insulating layer and a third insulating layer are sequentially coated outside the conductors, a flame-retardant layer is overlapped and wrapped outside the cable core, flame-retardant filler is filled in gaps among the cable cores in the flame-retardant layer, an inner protective layer is extruded outside the flame-retardant layer, an armor layer is compositely woven and wrapped outside the inner protective layer, and an outer protective layer is extruded outside the armor layer.

Preferably, the conductor is formed by twisting aluminum alloy monofilaments in the same direction in a bunching mode and a multi-twisting mode.

Preferably, the first insulating layer is an irradiation crosslinked polyethylene insulating layer, and the second insulating layer is an irradiation crosslinked polyolefin insulating layer.

Preferably, the first insulating layer and the second insulating layer are formed by double-layer co-extrusion at one time.

Preferably, the third insulating layer is formed by overlapping and wrapping polyimide insulating tapes.

Preferably, the flame-retardant layer is formed by wrapping a low-smoke halogen-free high-flame-retardant belt.

Preferably, the flame retardant filler is a low smoke zero halogen high flame retardant filler.

Preferably, the inner protective layer is extruded from thermosetting low-smoke halogen-free flame retardant polyolefin sheath material.

Preferably, the armor layer is formed by compositely braiding tinned copper wires and aramid fibers.

Preferably, the outer protective layer is extruded from thermosetting low-smoke halogen-free flame retardant polyolefin sheath material.

Compared with the prior art, the utility model has the advantages of aging resistance, bending resistance, hot oil resistance, high temperature resistance, high radiation resistance, long service life, high flame retardance, tear resistance, strong electromagnetic interference resistance, light weight, low smoke, no halogen, low toxicity and other excellent electrical performance and mechanical performance, and can meet the special use environment of 1E level in the nuclear power station on the ship.

Drawings

Fig. 1 is a schematic structural view of a halogen-free low-smoke low-toxicity high-life light-weight power cable of the utility model.

The reference numbers in the figure are 1, a conductor, 2, a first insulating layer, 3, a second insulating layer, 4, a third insulating layer, 5, a flame-retardant filler, 6, a flame-retardant layer, 7, an inner protective layer, 8, an armor layer, 9 and an outer protective layer.

Detailed Description

The utility model will be further described in detail with reference to the drawings and the detailed description below, in order to further understand the features and technical means of the utility model and the specific objects and functions achieved.

The halogen-free low-smoke low-toxicity long-life light-weight power cable shown in fig. 1 comprises a cable core, wherein the cable core is composed of a plurality of conductors 1, a first insulating layer 2, a second insulating layer 3 and a third insulating layer 4 are sequentially coated outside the conductors 1, a flame retardant layer 6 is lapped and wrapped outside the cable core, flame retardant fillers 5 are filled in gaps between the cable cores in the flame retardant layer 6, an inner protective layer 7, extruded and molded outside the flame retardant layer 6, an armor layer 8, composite braiding and coated outside the inner protective layer 7, and an outer protective layer 9 is extruded and molded outside the armor layer 8.

The conductor 1 is formed by twisting aluminum alloy monofilaments in the same direction in a bundle and in a compound manner. The first insulating layer 2 is an irradiation crosslinking polyethylene insulating layer, and the second insulating layer 3 is an irradiation crosslinking polyolefin insulating layer. The first insulating layer 2 and the second insulating layer 3 are formed by double-layer co-extrusion at one time. The third insulating layer 4 is formed by overlapping and wrapping polyimide insulating tapes. The flame-retardant layer 6 is formed by wrapping a low-smoke halogen-free high-flame-retardant belt. The flame-retardant filler 5 is a low-smoke halogen-free high-flame-retardant filler 5. The inner protective layer 7 is formed by extruding thermosetting low-smoke halogen-free flame retardant polyolefin sheath material. The armor layer 8 is formed by compositely braiding tinned copper wires and aramid fibers, and the braiding density is not less than 95%. The outer protective layer 9 is formed by extruding thermosetting low-smoke halogen-free flame retardant polyolefin sheath material.

The conductor 1 adopts a 5 th type soft structure design, and adopts high-quality high-strength high-conductivity aluminum alloy monofilaments as main materials. And carrying out homodromous beam twisting and compound twisting process treatment by special beam silk and compound twisting equipment. This design results in a conductor 1 with better bending properties and smaller outer diameter than conventional inner and outer layer counter structures. Meanwhile, the weight of the aluminum alloy conductor 1 is reduced by 2/3 as compared with copper material.

The armor layer 8 is formed by compositely braiding tinned copper wires and aramid wires. The aramid fiber is used as a novel high-tech synthetic fiber, has excellent physical properties that the strength is 5-6 times of that of the steel wire, the modulus is 2-3 times of that of the steel wire or glass fiber, the toughness is 2 times of that of the steel wire, and the weight is only about 1/5 of that of the steel wire. At a high temperature of 560 ℃, the aramid fiber does not decompose or melt. The characteristics enable the cable to have excellent performances of ultra-high strength, high modulus, high temperature resistance, acid resistance, alkali resistance and the like, and further reduce the overall weight of the cable. Meanwhile, the tinned copper wire braid also plays a role in shielding, and the strong electromagnetic interference resistance of the cable is effectively improved.

In the aspect of insulating layer design, the first insulating layer 2 and the second insulating layer 3 adopt a double-layer coextrusion technology of irradiation crosslinked polyethylene and irradiation crosslinked polyolefin. Further, the third insulating layer 4 is also formed by overlapping and wrapping a polyimide insulating tape. The gaps among the cable cores are filled by adopting a low-smoke halogen-free high-flame-retardant filler 5.

In terms of the protection layers, the inner protection layer 7 and the outer protection layer 9 are extruded by thermosetting low-smoke halogen-free flame retardant polyolefin. The design not only ensures that the cable has excellent electrical performance and mechanical performance, but also obviously improves the performances of aging resistance, bending resistance, heat oil resistance, high temperature resistance, high radiation resistance, long service life, high flame retardance, tear resistance, strong electromagnetic interference resistance and the like of the cable. Meanwhile, the cable also has the environmental protection characteristics of low smoke, no halogen, low toxicity and the like so as to meet the special use environment requirements in the nuclear power station on the ship.

The foregoing examples merely illustrate one or more embodiments of the utility model, which are described in greater detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.

Claims

1. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable, characterized in that it comprises:

The cable core is composed of a plurality of conductors (1); the conductors (1) are covered in sequence by a first insulating layer (2), a second insulating layer (3) and a third insulating layer (4);

A flame-retardant layer (6) is wrapped around the outside of the cable core, and flame-retardant filler (5) is filled in the gap between the cable cores within the flame-retardant layer (6).

Inner protective layer (7); extruded onto the outside of flame retardant layer (6);

Armor layer (8); composite braided covering the outside of the inner protective layer (7);

The outer protective layer (9) is extruded and formed outside the armor layer (8).

2. The halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 1, characterized in that the conductor (1) is formed by stranding and re-stretching aluminum alloy monofilaments in the same direction.

3. The halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 1, characterized in that the first insulation layer (2) is an irradiated cross-linked polyethylene insulation layer, and the second insulation layer (3) is an irradiated cross-linked polyolefin insulation layer.

4. The halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 3, characterized in that the first insulation layer (2) and the second insulation layer (3) are formed by double-layer co-extrusion in one step.

5. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 1, characterized in that the third insulation layer (4) is formed by overlapping and wrapping polyimide insulation tape.

6. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to any one of claims 1-5, characterized in that the flame-retardant layer (6) is formed by wrapping with a low-smoke, halogen-free, high flame-retardant tape.

7. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 6, characterized in that the flame-retardant filler (5) is a low-smoke, halogen-free, high flame-retardant filler (5).

8. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 7, characterized in that the inner protective layer (7) is extruded from thermosetting low-smoke, halogen-free, flame-retardant polyolefin sheath material.

9. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 8, characterized in that the armor layer (8) is made of tin-plated copper wire and aramid wire composite braiding.

10. A halogen-free, low-smoke, low-toxicity, long-life, lightweight power cable according to claim 9, characterized in that the outer protective layer (9) is extruded from thermosetting low-smoke, halogen-free, flame-retardant polyolefin sheath material.