CN211858196U

CN211858196U - Flexible multi-core waterproof oil-resistant high-low temperature-resistant cable

Info

Publication number: CN211858196U
Application number: CN202020528018.XU
Authority: CN
Inventors: 李明道; 赵亚超; 胡承伟; 孟宪伟
Original assignee: Zhejiang Wanma Co Ltd
Current assignee: Zhejiang Wanma Co Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-11-03
Anticipated expiration: 2030-04-10

Abstract

The utility model relates to the technical field of cables, and discloses a flexible multi-core waterproof oil-resistant high-low temperature-resistant cable, which comprises a plurality of twisted insulating wire cores, a water-blocking filler, a water-blocking tape, an aluminum-plastic composite tape, a butyronitrile polyvinyl chloride sheath and a polytetrafluoroethylene coating; the water blocking tape, the aluminum-plastic composite tape, the butyronitrile polyvinyl chloride sheath and the polytetrafluoroethylene coating are sequentially wrapped outside the plurality of insulated wire cores from inside to outside; and the water blocking filler is filled in a gap between the insulating wire core and the water blocking tape. The utility model discloses a cable still has better flexibility and resistant oily and high low temperature resistance ability when having better waterproof performance.

Description

Flexible multi-core waterproof oil-resistant high-low temperature-resistant cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a waterproof resistant high low temperature resistant cable of resistant oil of flexible multicore.

Background

In recent years, the electric power industry of China is rapidly developed, particularly, the development of the electric wire and cable industry is rapid, and the variety development of electric wires and cables shows a diversified trend. The electric wire and cable has been developed from pure power transmission to multi-functionalization, i.e. new characteristics are added according to different purposes. Previous requirements for water blocking were mainly limited to submarine, extra high voltage and telecommunication cable applications. With the deepening of research and understanding on insulation, water absorption and water trees, people are aware of the importance of waterproof performance on low-voltage power cables. At present, in regions with high underground water level or rainy years, low-voltage cables are mostly laid in a direct-buried mode or an open-air mode, so that the cables are often in a wet environment. However, in the cable, water easily enters the cable and is further decomposed into hydrogen and OH-ions, so that the transmission loss of the cable is increased, the performance of the cable is reduced, and the service life of the cable is shortened. Moreover, the cable is required to be immersed in oil for a long time and to operate normally in low-temperature and high-temperature environments, so that the cable is required to have high oil resistance and high and low temperature resistance.

Chinese patent publication No. CN209071013U discloses a waterproof safety cable, which comprises a cable body, a water-blocking ring, a water-blocking structure, a water-blocking tape and an outer protective layer, which are sequentially arranged from inside to outside, wherein the cable body comprises an inner core and an insulating layer wrapped on the inner core, the cable body is arranged in the water-blocking ring, and the water-blocking structure and the water-blocking tape are arranged between the water-blocking ring and the outer protective layer; the water blocking structure comprises a water blocking rope and a moisture-proof film comprising the water blocking rope, and the water blocking rope fills a gap formed between the water blocking tape and the water blocking ring. Wherein, the outer protective layer is butyronitrile polyvinyl chloride. The utility model discloses a through the setting of circle, the structure of blocking water and outer protective sheath of hindering water, improved the waterproof performance of cable, nevertheless have following problem: polyvinyl chloride has poor thermal stability, HCl gas can be released at high temperature, nitrile rubber is easy to age at high temperature, and after the polyvinyl chloride and the nitrile rubber are blended, although the heat resistance is improved to some extent, the range is not large, so that the cable is not suitable for being used in a high-temperature environment; and because only the outer protective layer plays a role of radial waterproofing in the cable structure, and the water blocking ring, the water blocking tape and the water blocking rope all play a role of radial water blocking, if the thickness of the outer protective layer is reduced for improving the high temperature resistance of the cable, the loss of the waterproof performance cannot be compensated by increasing the thicknesses of other layers.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a flexible multicore is waterproof resistant oily resistant high low temperature cable. The waterproof coating has better waterproof performance and better high-temperature resistance.

The utility model discloses a concrete technical scheme does:

a flexible multi-core waterproof oil-resistant high-low temperature-resistant cable comprises a plurality of twisted insulating wire cores, a water-blocking filler, a water-blocking tape, an aluminum-plastic composite tape, a butyronitrile polyvinyl chloride sheath and a polytetrafluoroethylene coating; the water blocking tape, the aluminum-plastic composite tape, the butyronitrile polyvinyl chloride sheath and the polytetrafluoroethylene coating are sequentially wrapped outside the plurality of insulated wire cores from inside to outside; and the water blocking filler is filled in a gap between the insulating wire core and the water blocking tape.

The utility model discloses a manufacturing process of cable as follows: twisting a plurality of insulated wire cores together, wrapping a water-blocking tape outside the insulated wire cores, and filling water-blocking filler in a gap between each insulated wire core and the water-blocking tape; then longitudinally wrapping an aluminum-plastic composite belt outside the water-blocking belt, extruding and wrapping a butyronitrile polyvinyl chloride protective sleeve, and finally coating a polytetrafluoroethylene coating.

In the cable structure, the aluminum-plastic composite belt, the butyronitrile polyvinyl chloride sheath and the polytetrafluoroethylene coating play a role in radial water prevention, so that water is prevented from radially permeating into the insulated wire core; the water-blocking filler and the water-blocking tape play a role in longitudinally blocking water, and when water enters from the end of the cable or the defect of the sheath, the water-blocking filler and the water-blocking tape can rapidly expand, so that the water is prevented from further diffusing along the longitudinal direction of the cable. Through radial waterproof and vertical dual function that blocks water, the utility model discloses a cable waterproof performance is better.

Besides the waterproof function, the butyronitrile polyvinyl chloride sheath also has good flexibility, bending property, extrusion resistance, oil resistance and low temperature resistance; the polytetrafluoroethylene coating on the outermost layer also has oil resistance, high and low temperature resistance, corrosion resistance, weather resistance and lubricating property.

Polyvinyl chloride has poor thermal stability, HCl gas can be released at high temperature, nitrile rubber is easy to age at high temperature, and the nitrile polyvinyl chloride obtained by blending the two materials has improved heat resistance but small amplitude, so that the nitrile polyvinyl chloride sheath has excellent waterproof capability, but the use of the nitrile polyvinyl chloride sheath can limit the high temperature resistance of a cable. Compared with the prior art, the utility model discloses an increase compound area of plastic-aluminum and polytetrafluoroethylene coating among the cable structure. The aluminum-plastic composite belt has a radial waterproof effect, and the heat resistance is better than that of a butyronitrile polyvinyl chloride sheath, so that more than the butyronitrile polyvinyl chloride sheath which plays a radial waterproof effect in a cable structure can still keep higher waterproof performance when the waterproof capability of the butyronitrile polyvinyl chloride sheath is damaged at high temperature, and the waterproof performance of the cable can be improved. The polytetrafluoroethylene coating on the outermost layer can also be radially waterproof, so that the function can be achieved; in addition, the cable has poor thermal conductivity, can play a role in heat insulation, reduces the influence of a high-temperature environment on the butyronitrile polyvinyl chloride sheath, has a long-term use temperature of-180-250 ℃, and can bear a high temperature of 200-260 ℃, so that the high-temperature resistance of the cable can be improved to a great extent; in addition, the polytetrafluoroethylene coating has a protective effect on the butyronitrile polyvinyl chloride sheath inside, and the butyronitrile polyvinyl chloride sheath can be prevented from being scratched and damaged in the laying and using processes of the cable, so that the waterproof performance of the cable is better guaranteed.

Preferably, each insulated wire core comprises a conductor and an insulated waterproof layer wrapped outside the conductor.

Preferably, the insulating waterproof layer is butyronitrile polyvinyl chloride.

In the prior art, rubber is usually adopted as an insulating layer for separating a conductor and a water-blocking filler, and after moisture permeates into the water-blocking filler, the water-blocking filler absorbs water to expand so as to play a role of longitudinally blocking water, but at the moment, the humidity in the water-blocking filler is very high, and the rubber is easy to age in the environment and loses the insulating protection effect. The utility model discloses with the crowded package of butyronitrile polyvinyl chloride insulating and waterproof layer outside the conductor, the effect of radial waterproof and insulation of performance can not be ageing impaired under the high humidity environment, therefore can give the better waterproof performance of cable.

Preferably, the water-blocking tape comprises one or more layers of polypropylene film.

Preferably, the thickness of the polypropylene film is 0.25-0.35 mm.

Preferably, the water-blocking filler is a water-blocking rope.

Preferably, the conductor is formed by twisting a plurality of single wires having the same diameter.

Preferably, the aluminum-plastic composite belt is a double-sided aluminum-plastic composite belt.

Preferably, the thickness of the aluminum-plastic composite belt is 0.2-0.3 mm.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the aluminum-plastic composite belt, the butyronitrile polyvinyl chloride sheath and the polytetrafluoroethylene coating play a role in radial water resistance, the water-blocking filler and the water-blocking belt play a role in longitudinal water resistance, and the water-blocking filler and the water-blocking belt are matched with each other, so that the water resistance of the cable is improved;

(2) the butyronitrile polyvinyl chloride sheath and the polytetrafluoroethylene coating can endow the cable with better flexibility, oil resistance and low-temperature resistance;

(3) the arrangement of the aluminum-plastic composite belt and the polytetrafluoroethylene coating can improve the high-temperature resistance of the cable.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The reference signs are: the cable comprises an insulating wire core 1, conductors 1-1, an insulating waterproof layer 1-2, a water-blocking filler 2, a water-blocking tape 3, an aluminum-plastic composite tape 4, a butyronitrile polyvinyl chloride sheath 5 and a polytetrafluoroethylene coating 6.

Detailed Description

The present invention will be further described with reference to the following examples. The devices, connections, and methods referred to in this disclosure are those known in the art, unless otherwise indicated.

As shown in fig. 1, the flexible multi-core waterproof oil-resistant high-low temperature-resistant cable comprises three twisted insulated wire cores 1, a water-resistant filler 2, a water-resistant tape 3, an aluminum-plastic composite tape 4, a butyronitrile polyvinyl chloride sheath 5 and a polytetrafluoroethylene coating 6. Each insulated wire core 1 comprises a conductor 1-1 formed by twisting a plurality of single wires with the same diameter and an insulated waterproof layer 1-2 made of butyronitrile polyvinyl chloride and wrapped outside the conductor 1-1. The water blocking tape 3, the aluminum-plastic composite tape 4, the butyronitrile polyvinyl chloride sheath 5 and the polytetrafluoroethylene coating 6 are sequentially wrapped outside the insulating wire cores 1 from inside to outside. The water-blocking filler 2 is a water-blocking rope and is filled in a gap between the insulating wire core 1 and the water-blocking tape 3. The water-blocking tape 3 comprises two layers of polypropylene films, and the thickness of each layer of polypropylene film is 0.3 mm. The aluminum-plastic composite belt 4 is a double-sided aluminum-plastic composite belt, and the thickness of the aluminum-plastic composite belt is 0.25 mm.

The manufacturing process of the cable is as follows: firstly, twisting a plurality of single wires with the same diameter into a conductor, and extruding and coating an insulating waterproof layer 1-2 outside the conductor to obtain an insulating wire core 1; twisting three insulating wire cores 1 together, wrapping a water-blocking tape 3 outside the insulating wire cores, and filling a water-blocking filler 2 into a gap between each insulating wire core and the water-blocking tape; then longitudinally wrapping an aluminum-plastic composite belt 4 outside the water-blocking belt 3, extruding and wrapping a butyronitrile polyvinyl chloride sheath 5, and finally coating a polytetrafluoroethylene coating 6.

In the cable structure, the aluminum-plastic composite belt 4, the butyronitrile polyvinyl chloride sheath 5 and the polytetrafluoroethylene coating 6 play a role in radial water resistance, and can prevent water from radially permeating into the insulating wire core; the water-blocking filler 2 and the water-blocking tape 3 play a role in longitudinally blocking water, and when water enters from the end of the cable or the defect of the sheath, the water-blocking filler 2 and the water-blocking tape 3 can rapidly expand, so that the water is prevented from further diffusing along the longitudinal direction of the cable. The dual functions of radial water resistance and longitudinal water resistance can endow the cable with better water resistance.

Besides the waterproof function, the butyronitrile polyvinyl chloride sheath 5 and the polytetrafluoroethylene coating 6 in the cable structure can endow the cable with better flexibility, oil resistance and low-temperature resistance; the arrangement of the aluminum-plastic composite belt 4 and the polytetrafluoroethylene coating 6 can improve the high-temperature resistance of the cable and make up for the defect of the butyronitrile polyvinyl chloride sheath 5 in thermal stability.

In conclusion, the cable structure has excellent waterproof performance, flexibility, oil resistance, low temperature resistance and high temperature resistance.

The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and equivalent structure transform of doing to above embodiment the utility model discloses technical scheme's protection scope.

Claims

1. A flexible multi-core waterproof oil-resistant high-low temperature-resistant cable is characterized by comprising a plurality of twisted insulating wire cores (1), a water-blocking filler (2), a water-blocking tape (3), an aluminum-plastic composite tape (4), a butyronitrile polyvinyl chloride sheath (5) and a polytetrafluoroethylene coating (6); the water blocking tape (3), the aluminum-plastic composite tape (4), the butyronitrile polyvinyl chloride sheath (5) and the polytetrafluoroethylene coating (6) are sequentially wrapped outside the plurality of insulating wire cores (1) from inside to outside; and the waterproof filler (2) is filled in a gap between the insulating wire core (1) and the waterproof tape (3).

2. The flexible multi-core waterproof oil-resistant high-temperature and low-temperature resistant cable as claimed in claim 1, wherein each of the insulated wire cores (1) comprises a conductor (1-1) and an insulating waterproof layer (1-2) wrapped outside the conductor (1-1).

3. The flexible multi-core waterproof oil-resistant high-temperature and low-temperature resistant cable as claimed in claim 2, wherein the insulating waterproof layer (1-2) is nitrile polyvinyl chloride.

4. The flexible multi-core waterproof oil-resistant high and low temperature-resistant cable as claimed in claim 1, wherein the water-blocking tape (3) comprises one or more layers of polypropylene films.

5. The flexible multi-core waterproof oil-resistant high and low temperature-resistant cable as claimed in claim 4, wherein the polypropylene film has a thickness of 0.25-0.35 mm.

6. The flexible multi-core waterproof oil-resistant high and low temperature-resistant cable as claimed in claim 1, wherein the water-blocking filler (2) is a water-blocking rope.

7. The flexible multi-core waterproof oil-resistant high and low temperature-resistant cable as claimed in claim 2, wherein the conductor (1-1) is formed by twisting a plurality of single wires having the same diameter.

8. The flexible multi-core waterproof oil-resistant high-low temperature-resistant cable as claimed in claim 1, wherein the aluminum-plastic composite tape (4) is a double-sided aluminum-plastic composite tape.

9. The flexible multi-core waterproof oil-resistant high-low temperature-resistant cable as claimed in claim 1, wherein the thickness of the aluminum-plastic composite tape (4) is 0.2-0.3 mm.