Crosslinked polyethylene nano-composite power cable

Abstract

The utility model belongs to the technical field of cables, and particularly relates to a crosslinked polyethylene nano-composite power cable, which comprises a cable core, an insulating layer is arranged on the outer side of the cable core, and a buffer layer is filled between the insulating layer and the cable core; a flame-retardant layer is arranged on the outer side of the shielding layer, and a heat preservation layer is arranged on the outer side of the flame-retardant layer. By arranging the insulating layer, the shielding layer, the flame-retardant layer, the heat preservation layer, the anti-freezing layer and the wear-resistant layer, protection on the cable core can be effectively enhanced, and the cable has excellent cold resistance, good insulating performance, good flame retardance, improved wear resistance and pressure resistance when in use; therefore, the service life of the cable is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cable technical field especially relates to a cross -linked polyethylene nanometer composite power cable. BACKGROUND

[0002] In prior art, cable is constituted by wire core, insulator, filling material etc., and the outer surface of conductor is only provided with a layer of non -flame -retardant insulating layer. In order to improve the safety level of electrical circuit, the flame -retardant problem of wire and cable is more and more caused people's attention, and the flame -retardant of cable has become a comprehensive development direction of cable industry, and cross -linked polyethylene insulated cable is more and more widely used due to the advantages such as high temperature resistance grade and non -toxic gas release.

[0003] The existing cross -linked polyethylene cable has poor fire -resistant performance, and basically is only provided with a layer of protective sleeve on the outer side of cable core, so that the stability of overall structure is not good enough, and damage can occur with the increase of use time, and the cable is prone to damage under long -term use, has low fire -resistant performance, has safety hazard, affects overall safety performance, thereby reduces the service life, can not satisfy the existing demand, has poor practicality, and the cross -linked polyethylene nanometer composite power cable is provided. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of cross -linked polyethylene nanometer composite power cables, to solve the problems presented in the above background technology.

[0005] Therefore, the utility model provides a kind of cross -linked polyethylene nanometer composite power cable, comprising:

[0006] Cable core, the outer side of the cable core is provided with an insulating layer, the insulating layer is filled with a buffer layer between the cable core, the outer side of the insulating layer is equipped with a shielding layer;

[0007] The outer side of the shielding layer is provided with a flame -retardant layer, the outer side of the flame -retardant layer is provided with a thermal insulation layer;

[0008] The outer side of the thermal insulation layer is provided with an anti -freezing layer, and the outer side of the anti -freezing layer is provided with a wear -resistant layer.

[0009] In the above technical solution, further, the insulating layer is a cross-linked polyethylene nanocomposite insulating layer, which is a new type of insulating material formed by introducing nanofillers into a cross-linked polyethylene matrix. The addition of nanofillers can improve the dielectric properties of cross-linked polyethylene, such as reducing the dielectric constant and dielectric loss factor, increasing the insulation resistance and breakdown strength. For example, the XLPE nanocomposite with a mass fraction of 2% of silica nanofillers has the lowest maximum partial discharge value and significantly improved dielectric breakdown strength. The nanocomposite insulating layer can effectively inhibit the growth of water trees and electrical trees, improve the ability of the insulating material to resist environmental factors such as moisture, oxygen, and ultraviolet radiation, delay the aging process, and extend the service life of the cable.

[0010] In the above technical solution, further, the shielding layer is woven with fine copper wires, which can provide better shielding continuity and better shielding effect for low-frequency interference.

[0011] In the above technical solution, further, the flame-retardant layer is made of flame-retardant polyvinyl chloride material, which is inexpensive, low in production cost, has good insulating properties, and good flame retardancy.

[0012] In the above technical solution, further, the thermal insulation layer is made of glass fiber material, which has the advantages of high temperature resistance, heat insulation, and insulation, can effectively block heat transfer, and has good chemical stability and is not easily eroded by external environment. It is often used in combination with other thermal insulation materials to enhance the overall performance of the thermal insulation layer.

[0013] In the above technical solution, further, the anti-freezing layer is made of low-temperature polyvinyl chloride material, which has excellent cold resistance and can maintain softness and reliability at low temperatures.

[0014] In the above technical solution, further, the wear-resistant layer is made of silicon carbide material, which has a Mohs hardness of about 9.5, second only to diamond. This high hardness enables silicon carbide material to resist the intrusion of other objects when subjected to friction and wear, thereby effectively reducing wear and tear. When in contact with materials of lower hardness and subjected to relative motion, silicon carbide acts like a hard shield and is not easily scratched or abraded.

[0015] In the above technical solution, further, the buffer layer is made of asbestos material, which has good thermal insulation and fire resistance. Asbestos fibers have a certain tensile strength and flexibility, and can play a role in strengthening and protecting the cable. It can help the cable resist certain external tensile forces, bending, and other effects, so that the cable is not easily damaged during installation and use.

[0016] In the above technical solution, further, the wear-resistant layer is provided with a cavity, the cavity is provided with longitudinal reinforcing ribs and transverse reinforcing ribs, the longitudinal reinforcing ribs and the transverse reinforcing ribs are staggered and arranged in a mesh shape in the cavity, the longitudinal reinforcing ribs and the transverse reinforcing ribs can enhance the wear resistance of the wear-resistant layer, improve the wear resistance, and avoid damage of the cable.

[0017] The utility model discloses the beneficial effect is:

[0018] The crosslinked polyethylene nanometer composite power cable can effectively enhance the protection of the cable core, has excellent cold resistance, good insulation and good flame retardance, improves wear resistance and compression resistance, prevents stretching, and thus prolongs the service life of the cable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;

[0020] Fig. 2 It is the structure schematic diagram of the insulation layer, the shielding layer, the flame-retardant layer, the heat preservation layer, the anti-freezing layer and the wear-resistant layer of the utility model;

[0021] Fig. 3 It is the wear-resistant layer cross section structure schematic diagram of the utility model.

[0022] The marks in the figure are:

[0023] 1, cable core; 2, insulation layer; 3, shielding layer; 4, flame-retardant layer; 5, heat preservation layer; 6, anti-freezing layer; 7, wear-resistant layer; 8, cavity; 9, transverse reinforcing rib; 10, longitudinal reinforcing rib; 11, buffer layer. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0025] In the description of the present application, it should be noted that the terms used herein are merely for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. For the purpose of description, the dimensions of the various parts shown in the drawings are not drawn to scale. The techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification when appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0026] It should be noted that the terms "first", "second", and the like in the description and claims of the application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of such terms as "first" and "second" are arbitrary labels and are used for purposes of distinguishing between the elements being referred to, and therefore, it is to be understood that the "first" and "second" elements can be interchangeable and that the embodiments of the application can operate in other sequences than those described or illustrated herein. Moreover, the terms "first", "second", and the like are not necessarily used consistently throughout the description and claims of this application and, as such, are not necessarily used consistently in respect to a particular element of the application.

[0027] It should be noted that in the description of the present application, the orientation or positional relationships indicated by the terms such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description. Without being contrary, these orientation terms do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be understood as limiting the scope of protection of the present application. The orientation terms "inner, outer" refer to the inner and outer relative to the contour of the parts themselves.

[0028] It should be noted that in this application, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed, or further include elements inherent in such processes, methods, articles or devices. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to certain examples can be combined in other examples. Embodiment 1

[0029] Please refer to Figs. 1-3 The present embodiment provides a cross-linked polyethylene nanocomposite power cable.

[0030] Comprising:

[0031] The cable core 1 is provided with an insulation layer 2 on the outer side, a buffer layer 11 is filled between the insulation layer 2 and the cable core 1, and a shielding layer 3 is provided on the outer side of the insulation layer 2;

[0032] The outer side of the shielding layer 3 is provided with a flame-retardant layer 4, and the outer side of the flame-retardant layer 4 is provided with a thermal insulation layer 5;

[0033] The outer side of the thermal insulation layer 5 is provided with an anti-freezing layer 6, and the outer side of the anti-freezing layer 6 is provided with a wear-resistant layer 7.

[0034] The insulation layer 2 is a cross-linked polyethylene nanocomposite insulation layer, which is a new type of insulation material formed by introducing nanofiller into a cross-linked polyethylene matrix. The addition of nanofiller can improve the dielectric properties of cross-linked polyethylene, such as reducing the dielectric constant and dielectric loss factor, increasing the insulation resistance and breakdown strength. For example, the XLPE nanocomposite with 1% mass fraction of silica nanofiller has the lowest maximum partial discharge value, and the dielectric breakdown strength is significantly improved. The nanocomposite insulation layer can effectively inhibit the growth of water tree branches and electrical tree branches, improve the ability of the insulation material to resist environmental factors such as moisture, oxygen, ultraviolet light, etc., delay the aging process, and prolong the service life of the cable. Embodiment 2

[0035] The present embodiment provides a cross-linked polyethylene nanocomposite power cable, in addition to the technical solutions of the above-mentioned embodiments, further having the following technical features.

[0036] The shielding layer 3 is woven with fine copper wires, which can provide better shielding continuity and better shielding effect for low-frequency interference. Embodiment 3

[0037] The embodiment provides a cross-linked polyethylene nanocomposite power cable, in addition to the technical solutions of the above-mentioned embodiments, further has the following technical features.

[0038] The fire-retardant layer 4 is made of fire-retardant polyvinyl chloride material, which is cheap in price, low in production cost, good in insulation performance and good in fire-retardant property. Embodiment 4

[0039] The embodiment provides a cross-linked polyethylene nanocomposite power cable, in addition to the technical solutions of the above-mentioned embodiments, further has the following technical features.

[0040] The heat preservation layer 5 is made of glass fiber material, which has the advantages of high temperature resistance, heat insulation, insulation and the like, can effectively block heat transfer, and has good chemical stability and is not easy to be eroded by external environment. It is often used in combination with other thermal insulation materials to enhance the overall performance of the thermal insulation layer. Embodiment 5

[0041] The embodiment provides a cross-linked polyethylene nanocomposite power cable, in addition to the technical solutions of the above-mentioned embodiments, further has the following technical features.

[0042] The anti-freezing layer 6 is made of low-temperature polyvinyl chloride material, which has excellent cold resistance and can maintain softness and reliability at low temperature. Embodiment 6

[0043] The embodiment provides a cross-linked polyethylene nanocomposite power cable, in addition to the technical solutions of the above-mentioned embodiments, further has the following technical features.

[0044] The wear-resistant layer 7 is made of silicon carbide material, which has a Mohs hardness of about 9.5, only next to diamond. This high hardness enables the silicon carbide material to resist the intrusion of other objects when subjected to friction and wear, thereby effectively reducing wear. When in contact with materials with lower hardness and relative movement occurs, the silicon carbide acts like a hard shield, which is not easy to be scratched or abraded. Embodiment 7

[0045] The embodiment provides a cross-linked polyethylene nanocomposite power cable, in addition to the technical solutions of the above-mentioned embodiments, further has the following technical features.

[0046] The buffer layer 11 is made of asbestos material, has good heat insulation and fire resistance, the asbestos fiber has certain tensile strength and flexibility, can play the role of reinforcement and protection in the cable, and can help the cable resist certain external stretching, bending and other effects, so that the cable is not easy to be damaged during laying and use.

[0047] The cavity 8 is provided with longitudinal reinforcing ribs 10 and transverse reinforcing ribs 9, the longitudinal reinforcing ribs 10 and the transverse reinforcing ribs 9 are staggered and arranged in a mesh shape in the cavity 8, the longitudinal reinforcing ribs 10 and the transverse reinforcing ribs 9 can enhance the wear resistance of the wear-resistant layer 7, improve the wear resistance, and avoid damage to the cable.

[0048] In use, the insulation layer 2, the shielding layer 3, the flame-retardant layer 4, the heat preservation layer 5, the anti-freezing layer 6 and the wear-resistant layer 7 can effectively enhance the protection of the cable core 1, have excellent cold resistance, good insulation performance, good flame retardance, improved wear resistance and pressure resistance, and resistance to stretching, thereby prolonging the service life of the cable.

[0049] The embodiments of the present application are described above in combination with the drawings, the embodiments and the features in the embodiments in the present application can be combined with each other without conflict, the present application is not limited to the above specific embodiments, the above specific embodiments are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims, which all belong to the protection scope of the present application.

Claims

1. A cross-linked polyethylene nanocomposite power cable, characterized in that, include: The cable core (1) has an insulation layer (2) on its outer side, and a buffer layer (11) is filled between the insulation layer (2) and the cable core (1). A shielding layer (3) is provided on the outer side of the insulation layer (2). A flame-retardant layer (4) is provided on the outside of the shielding layer (3), and a heat-insulating layer (5) is provided on the outside of the flame-retardant layer (4). An antifreeze layer (6) is provided on the outside of the insulation layer (5), and a wear-resistant layer (7) is provided on the outside of the antifreeze layer (6).

2. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The insulating layer (2) is a cross-linked polyethylene nanocomposite insulating layer.

3. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The shielding layer (3) is woven from fine copper wire.

4. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The flame-retardant layer (4) is made of flame-retardant polyvinyl chloride material.

5. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The insulation layer (5) is made of glass fiber material.

6. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The antifreeze layer (6) is made of low-temperature polyvinyl chloride material.

7. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The wear-resistant layer (7) is made of silicon carbide material.

8. The cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The buffer layer (11) is made of asbestos material.

9. A cross-linked polyethylene nanocomposite power cable according to claim 1, characterized in that, The wear-resistant layer (7) has a cavity (8) inside, and longitudinal reinforcing ribs (10) and transverse reinforcing ribs (9) are provided inside the cavity (8). The longitudinal reinforcing ribs (10) and transverse reinforcing ribs (9) are arranged in a mesh pattern in the cavity (8).

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