CN212694861U

CN212694861U - Small-section high-voltage special cable

Info

Publication number: CN212694861U
Application number: CN202021948928.XU
Authority: CN
Inventors: 潘磊; 高帅
Original assignee: Hunan Valin Wire and Cable Co Ltd
Current assignee: Hunan Valin Wire and Cable Co Ltd
Priority date: 2020-09-09
Filing date: 2020-09-09
Publication date: 2021-03-12
Anticipated expiration: 2030-09-09

Abstract

The utility model discloses a small cross section high pressure special cable, from interior to exterior includes conductor, functional layer and restrictive coating in proper order, the conductor is formed by stranded conductive metal wire transposition, the functional layer from interior to exterior includes first insulation layer and second insulating layer, the first insulation layer includes a plurality of layers of semi-directional polytetrafluoroethylene membrane, a half directional polytetrafluoroethylene membrane is just alternately crossed around the package and is in the conductor outside, the second insulating layer includes a plurality of layers of directional polytetrafluoroethylene membrane, a directional polytetrafluoroethylene membrane is just alternately crossed around the package in the first insulation layer outside, the restrictive coating includes thermoplasticity vulcanize rubber layer, the rubber layer is crowded package in the second insulating layer outside. The cable has the advantages of small section, small outer diameter, light weight, softness and convenience in transportation and connection, can keep high-voltage transmission on a conductor with a small section, has the characteristics of mould resistance and flame retardance, and is suitable for being used in places with strict requirements on outer diameter and weight or special devices.

Description

Small-section high-voltage special cable

Technical Field

The utility model relates to a special type cable field specifically is a small-section high pressure special type cable.

Background

The traditional high-voltage cable is generally formed by extruding and wrapping polyethylene or cross-linked polyethylene on a conductor, the polyethylene and the cross-linked polyethylene have excellent electrical property, and the common cross-linked polyethylene is more used on the high-voltage cable, but the high-voltage cable is usually thicker in insulation thickness and larger in outer diameter, and is not suitable for being used on special occasions with outer diameter requirements or weight requirements and the like.

Patent CN110690008A discloses a manufacturing method of a radiation-resistant small-section high-voltage direct-current cable for a nuclear power station, wherein the nominal sectional area range of a conductor of the cable is 4-10 mm². The structure of the cable is as follows: the conductor, the inner semi-conductive shielding layer, the insulating layer, the outer semi-conductive shielding layer, the metal shielding layer, the polyimide film layer and the sheath are arranged from inside to outside in sequence. Also, although a method of manufacturing the same is disclosed, the conductor used therein has an excessively large nominal cross-sectional area and does not satisfy the characteristic of a small cross-section. The nominal sectional area of a conductor that this patent designed is 1mm²The special cable has the advantages of small section, small outer diameter, light weight, flexibility and convenience in transportation and connection, can keep high-voltage transmission on a conductor with a small section, has the characteristics of mould resistance and flame retardance, and is suitable for being used in places with strict requirements on outer diameter and weight or special devices.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a small cross-section high pressure special type cable to the cross-section that proposes in solving above-mentioned background is not little enough, and the external diameter is big, problem that weight is big.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a small-section high pressure special cable, from interior to exterior includes conductor, functional layer and restrictive coating in proper order, the conductor is formed by the transposition of stranded conductive metal wire, the functional layer from interior to exterior includes first insulation layer and second insulating layer, the first insulation layer includes a plurality of layers of semi-directional polytetrafluoroethylene membrane, a positive reverse cross of semi-directional polytetrafluoroethylene membrane is in around the package the conductor outside, the second insulating layer includes a plurality of layers of directional polytetrafluoroethylene membrane, a positive reverse cross of directional polytetrafluoroethylene membrane is in the first insulation layer outside around the package, the restrictive coating includes thermoplasticity vulcanized rubber layer, the rubber layer crowded package is in the second insulating layer outside.

As a further improvement of the above technical solution:

the nominal cross-sectional area of the conductor is not more than 1mm². The existing small-section high-voltage cable can only achieve the area of 4mm²The utility model discloses a 1mm can be realized to the cable²And the high pressure resistance is ensured.

The conductor is one or a combination of silver-plated copper wires, tinned copper wires and copper wires. The conductor is used as a main element, the conductivity is influenced by the characteristics of the conductor, different conductors can be selected according to actual use, copper wires are usually used, and silver-plated copper wires are selected when the transmission efficiency is required.

The number of the layers of the semi-oriented polytetrafluoroethylene film is 4-6. The semi-oriented polytetrafluoroethylene film can be sintered and molded at high temperature and can be adhered together, the sealing property is improved, and partial discharge can be effectively prevented.

The lapping overlapping rate of the semi-oriented polytetrafluoroethylene film is not less than 50%. The lapping overlapping rate is too low to facilitate high-temperature adhesion.

The number of layers of the oriented polytetrafluoroethylene film is 6-10. The oriented polytetrafluoroethylene film has excellent volume resistivity and surface resistivity, is suitable for being used in multilayer wrapping in high-voltage occasions, can improve the high-voltage resistance strength of the oriented polytetrafluoroethylene film, and prevents partial discharge.

The lapping overlapping rate of the oriented polytetrafluoroethylene film is not less than 50%.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a small cross-section high pressure special cable, conductor adopt nominal cross sectional area 1mm²The metal realizes the characteristic of small section, and simultaneously utilizes the combination of the multilayer semi-oriented polytetrafluoroethylene film and the oriented polytetrafluoroethylene film to realize the prevention of partial discharge and improve the high-pressure resistance of the cableThe high-voltage transmission characteristic is kept on the cable body, and the cable has the characteristics of mould resistance and flame retardance, and is suitable for being used in places with strict requirements on the outer diameter and the weight or special devices.

Drawings

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

Reference numerals: 1. a conductor; 2. a functional layer; 3. a sheath layer; 21. a first insulating layer; 22. a second insulating layer.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the small-section high-voltage special cable of the embodiment sequentially includes a conductor 1, a functional layer 2 and a sheath layer 3 from inside to outside, the conductor 1 is formed by twisting a plurality of silver-plated copper wires, and the nominal cross-sectional area of the twisted conductor 1 is 1mm²。

The functional layer 2 comprises a first insulating layer 21 and a second insulating layer 22 from inside to outside, the first insulating layer 21 comprises 4 layers of semi-oriented polytetrafluoroethylene films, a first semi-oriented polytetrafluoroethylene film is wrapped on the outer side of the conductor 1 in a positive and negative crossing mode, the wrapping overlapping rate is 50%, the second insulating layer 22 comprises 6 layers of oriented polytetrafluoroethylene films, a first directional polytetrafluoroethylene film is wrapped on the outer side of the first insulating layer 21 in a positive and negative crossing mode, the wrapping overlapping rate is not lower than 50%, the sheath layer 3 comprises a thermoplastic vulcanized rubber layer, and the rubber layer is wrapped on the outer side of the second insulating layer 22 in a squeezing mode. The polytetrafluoroethylene has excellent volume resistivity and surface resistivity, and is suitable for high-pressure occasions, the semi-oriented polytetrafluoroethylene films can be adhered together after high temperature, the cables are sintered at the high temperature of 300 ℃ after being wound forwards and backwards, the films are easy to burn and explode when the sintering temperature is too high, and the films are not sintered when the sintering temperature is too low, so that the electrical property is influenced. After sintering, the films are closely adhered together to form an integral protective layer, namely the first insulating layer 21, so that high-voltage partial discharge can be effectively prevented, and normal use of the cable is ensured. The first insulating layer 21 is externally connected with 6 layers of oriented polytetrafluoroethylene films in a positive and negative wrapping mode to form a second insulating layer 22, the tension is properly increased during wrapping, the films are prevented from loosening, and sintering is not needed after wrapping. The multi-layer polytetrafluoroethylene film wrapping can improve the insulating strength and enable the multi-layer polytetrafluoroethylene film to resist higher voltage. The sheath layer 3 is thermoplastic vulcanized rubber (TPV), and the TPV has the characteristics of good flame retardance and mould resistance and is relatively soft. The prepared cable has the characteristics of small section, high pressure resistance, small outer diameter and light weight.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a small cross section high pressure special cable, from inside to outside includes conductor (1), functional layer (2) and restrictive coating (3) in proper order, its characterized in that: conductor (1) is twisted by stranded conductive metal wire and forms, functional layer (2) from inside to outside includes first insulating layer (21) and second insulating layer (22), first insulating layer (21) include a plurality of layers of semi-directional polytetrafluoroethylene membrane, the package is in around crossing in the positive one of semi-directional polytetrafluoroethylene membrane conductor (1) outside, second insulating layer (22) include a plurality of layers of directional polytetrafluoroethylene membrane, the package is in the first insulating layer (21) outside in the positive one of directional polytetrafluoroethylene membrane is crossing in the opposite direction, restrictive coating (3) include thermoplasticity vulcanize rubber layer, the rubber layer is crowded package in the second insulating layer (22) outside.

2. A small-section high-voltage special cable according to claim 1, characterized in that: the nominal cross-sectional area of the conductor (1) is not more than 1mm²。

3. A small-section high-voltage special cable according to claim 2, characterized in that: the conductor (1) is one or a combination of silver-plated copper wires, tinned copper wires and copper wires.

4. A small-section high-voltage special cable according to claim 1, characterized in that: the number of the layers of the semi-oriented polytetrafluoroethylene film is 4-6.

5. A small-section high-voltage special cable according to claim 2, characterized in that: the lapping overlapping rate of the semi-oriented polytetrafluoroethylene film is not less than 50%.

6. A small-section high-voltage special cable according to claim 1, characterized in that: the number of layers of the oriented polytetrafluoroethylene film is 6-10.

7. A small-section high-voltage special cable according to claim 6, characterized in that: the lapping overlapping rate of the oriented polytetrafluoroethylene film is not less than 50%.