CN212694862U

CN212694862U - High-temperature-resistant small-section high-voltage special cable

Info

Publication number: CN212694862U
Application number: CN202021968517.7U
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: 2020-09-10
Filing date: 2020-09-10
Publication date: 2021-03-12
Anticipated expiration: 2030-09-10

Abstract

The utility model discloses a high temperature resistant small cross section high pressure special cable, from interior and outer conductor, functional layer and restrictive coating include in proper order, and the conductor is formed by stranded conductive metal wire transposition, and the functional layer from interior and outer including first insulation layer, second insulating layer and heat-resistant layer, first insulation layer include a plurality of layers of semi-directional polytetrafluoroethylene membrane, and the positive anticrossing of semi-directional polytetrafluoroethylene membrane is around the package the conductor outside, the second insulating layer include a plurality of layers of directional polytetrafluoroethylene membrane, and the positive anticrossing of directional polytetrafluoroethylene membrane is around the package in the first insulation layer outside, and the heat-resistant layer includes a sandwich around the package, and the sandwich is around the package in the second insulating layer outside, and it is including the glass fiber band layer that is located the compound band layer of pottery in the middle of being located and being located both sides, and the restrictive coating is the glass fiber weaving layer. The obtained cable has the advantages of small cross section, small outer diameter, light weight, softness, convenient transportation and connection and good high-temperature resistance, and can be suitable for various use environments.

Description

High-temperature-resistant small-section high-voltage special cable

Technical Field

The utility model relates to a special type cable field specifically is a high temperature resistant small-cross 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 CN201920596101.8 discloses a lightweight high-voltage flexible cable for new energy automobiles, which comprises a central conductor, a twisted conductor, a protection component and a shielding component, wherein the central conductor comprises a plurality of strands of inner-layer conductor monomers, and the inner-layer conductor monomers are twisted with each other; the compound twisted conductor comprises a plurality of strands of outer layer lead monomers, and each outer layer lead monomer is wound outside the central conductor in a compound twisted mode; the protection assembly comprises an insulating sheath and an inner protection layer, the inner side wall of the insulating sheath is coated outside the twisted conductor, and the inner protection layer is spirally wound outside the outer side wall of the insulating sheath. The light-weight high-voltage flexible cable for the new energy automobile is characterized in that aluminum alloy filaments with the diameter of less than 0.5mm are arranged as conducting wires, so that the high-voltage flexible cable has the characteristics of good flexibility and light weight; through setting up insulating sheath, can be so that this cable possesses high temperature resistant and low temperature resistant performance, prolong the life of this cable. The nominal sectional area range of the conductor of the prepared cable is 4-10 mm². However, the nominal cross-sectional area of the conductor used is too large, and the characteristic of a small cross-section is not satisfied. Meanwhile, when the conductor is used, the conductor is found to have poor high-temperature resistance and heavy weight, so that the nominal sectional area of the conductor designed by the patent is 1mm²The special cable has the advantages of small section, small outer diameter, light weight, flexibility, convenient transportation and connection, can keep high-voltage transmission on a conductor with a small section, and has the characteristic of high temperature resistance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high temperature resistant small cross-section high pressure special type cable to the cable that provides in solving above-mentioned background art is high temperature resistant can the difference, 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 high temperature resistant small cross section high pressure special cable, from inside to outside 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 inside to outside includes first insulating layer, second insulating layer and heat-resistant layer, first insulating layer includes a plurality of layers of semi-directional polytetrafluoroethylene membrane, a half directional polytetrafluoroethylene membrane is just alternately around wrapping the conductor outside, the second insulating layer includes a plurality of layers of directional polytetrafluoroethylene membrane, a directional polytetrafluoroethylene membrane is just alternately around wrapping the first insulating layer outside, the heat-resistant layer includes a sandwich around the covering, the sandwich is around wrapping the covering outside the second insulating layer, and it includes the compound band layer of pottery and the glass fiber band layer that is located both sides that is located in the middle of it, the restrictive coating is the glass fiber silk weaving layer.

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

The number of layers of the oriented polytetrafluoroethylene film is 6-10. The lapping overlapping rate of the oriented polytetrafluoroethylene film is not less than 50%. 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 weaving density of the glass fiber yarn weaving layer is more than 95%. The glass fiber yarns have high weaving density, can keep the tightness of the internal cable, and can improve the heat resistance of the cable.

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

the utility model discloses a high temperature resistant small cross section high pressure special cable, conductor adopt nominal cross sectional area 1mm²The prepared cable has the advantages of small section, small outer diameter, light weight, softness and convenience in transportation and connection, can keep the characteristic of high-voltage transmission on a conductor with a small section, has the characteristics of mildew resistance and flame retardance, and is suitable for being used in places with strict requirements on outer diameter and weight or special devices.

The utility model discloses a set up the heat-resistant layer, adopt two-layer glass fiber band layer with filling pottery compound band layer around the package, pottery compound band begins to become the casing of pottery form hardening under the temperature more than 350 ℃ after being heated. The ceramic hard shell can play a good role in flame retardance, fire resistance, fire prevention and fire insulation, the maximum temperature can reach 3000 ℃, the smoothness of a circuit is effectively guaranteed, and the glass fiber yarns are woven outside the sandwich layer, so that the whole cable is compact, and the high-temperature resistance performance is better.

Drawings

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

Fig. 2 is an enlarged schematic view of a point a in fig. 1.

Reference numerals: 1. a conductor; 2. a functional layer; 3. a sheath layer; 21. a first insulating layer; 22. a second insulating layer; 43. a heat-resistant layer; 431. ceramizing the composite tape layer; 432. a layer of fiberglass tape; 433. the glass fiber silk weaving 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 and fig. 2, the high temperature resistant small cross-section high voltage special cable of the present embodiment comprises a conductor 1, a functional layer 2 and a sheath layer 3 in sequence from inside to outside, the conductor 1 is formed by twisting a plurality of conductive metal wires, the functional layer 2 comprises a first insulating layer 21, a second insulating layer 22 and a heat resistant layer 43 from inside to outside, the first insulating layer 21 comprises 5 layers of semi-oriented polytetrafluoroethylene film, the semi-oriented polytetrafluoroethylene film is wrapped around the conductor 1 in a positive-negative crossing manner with a wrapping overlapping rate of 50%, the second insulating layer 22 comprises 8 layers of oriented polytetrafluoroethylene film, the oriented polytetrafluoroethylene film is wrapped around the first insulating layer 21 in a positive-negative crossing manner with a wrapping overlapping rate of not less than 50%, the sheath layer 3 comprises a thermoplastic vulcanized rubber layer, the rubber layer is extruded around the second insulating layer 22, polytetrafluoroethylene has excellent volume resistivity and surface resistivity, and is suitable for high voltage application, the semi-oriented polytetrafluoroethylene film can be adhered together after high temperature, the cable is sintered at the high temperature of 300 ℃ after positive and negative wrapping, the film is easy to burn and fry when the sintering temperature is too high, and the film is 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, the first insulating layer 21 is externally connected with 6 layers of oriented polytetrafluoroethylene films in a positive and negative wrapping mode to form the second insulating layer 22, the tension is properly increased during wrapping, the films are prevented from being loose, and sintering is not needed after wrapping. Can effectively prevent high-voltage partial discharge and ensure the normal use of the cable. The multi-layer polytetrafluoroethylene film wrapping can improve the insulating strength and enable the multi-layer polytetrafluoroethylene film to resist higher voltage. The heat-resistant layer 43 comprises a sandwich wrapping layer, the sandwich wrapping layer is wrapped outside the second insulating layer 22 and comprises a ceramic composite tape layer 431 in the middle and glass fiber tape layers 432 on two sides, and the sheath layer 3 is a glass fiber woven layer 433. The weaving density of the glass fiber yarn weaving layer 433 is more than 95 percent. So both guaranteed the lightweight of cable, guaranteed the high temperature resistance performance of cable again, be applicable to multiple service environment. 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 high temperature resistant small cross section high pressure special cable, from interior to exterior includes conductor (1), functional layer (2) and restrictive coating (3) in proper order, its characterized in that: the conductor (1) is formed by twisting a plurality of strands of conductive metal wires, the functional layer (2) comprises a first insulating layer (21), a second insulating layer (22) and a heat-resistant layer (43) from inside to outside, the first insulating layer (21) comprises a plurality of layers of semi-oriented polytetrafluoroethylene films, the semi-oriented polytetrafluoroethylene films are wrapped outside the conductor (1) in a positive-negative crossing manner, the second insulating layer (22) comprises a plurality of layers of oriented polytetrafluoroethylene films, the oriented polytetrafluoroethylene films are wrapped outside the first insulating layer (21) in a positive-negative crossing manner, the heat-resistant layer (43) comprises a sandwich wrapping layer which is wrapped on the outer side of the second insulating layer (22), the composite cable comprises a ceramic composite belt layer (431) positioned in the middle and glass fiber belt layers (432) positioned on two sides, wherein the sheath layer (3) is a glass fiber woven layer (433).

2. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 1, wherein: the nominal cross-sectional area of the conductor (1) is not more than 1mm²。

3. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 2, wherein: the conductor (1) is one or a combination of silver-plated copper wires, tinned copper wires and copper wires.

4. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 1, wherein: the number of the layers of the semi-oriented polytetrafluoroethylene film is 4-6.

5. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 2, wherein: the lapping overlapping rate of the semi-oriented polytetrafluoroethylene film is not less than 50%.

6. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 1, wherein: the number of layers of the oriented polytetrafluoroethylene film is 6-10.

7. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 4, wherein: the lapping overlapping rate of the oriented polytetrafluoroethylene film is not less than 50%.

8. The special high-temperature-resistant small-section high-pressure cable as claimed in claim 1, wherein: the weaving density of the glass fiber yarn weaving layer (433) is larger than 95%.