CN210777977U

CN210777977U - Waterproof, compression-resistant and wear-resistant crosslinked polyethylene insulated power cable

Info

Publication number: CN210777977U
Application number: CN201921889732.5U
Authority: CN
Inventors: 王立; 许军; 王静杰
Original assignee: Aerospace Rich Cable Co ltd
Current assignee: Aerospace Rich Cable Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-06-16
Anticipated expiration: 2029-11-05

Abstract

The utility model provides a waterproof, resistance to compression, wear-resisting crosslinked polyethylene insulation power cable. The power cable comprises at least two stranded conductors, a PP filling rope, a water-blocking structure layer and an outer sheath, wherein the at least two stranded conductors and the PP filling rope form a cable core after being subjected to steam crosslinking, and each stranded conductor consists of a plurality of tightly pressed and stranded monofilament conductors and a crosslinked polyethylene insulating layer extruded outside the plurality of tightly pressed and stranded monofilament conductors; the water-blocking structure layer comprises a water-blocking tape waterproof layer which is radially wrapped outside the cable core and an aluminum-plastic composite tape water-proof layer which is longitudinally wrapped outside the water-blocking tape waterproof layer, and the protective sleeve is of a high-density high-hardness polyethylene protective sleeve structure with a concave-convex gear-shaped cross section. The utility model discloses a structure of blocking water can reach radial and vertical effect of blocking water, and the oversheath adopts the direct extrusion of mould to form gear type structure, has increased stand wear and tear ability again when possessing traditional steel band armor power cable's compressive resistance, has still reduced power cable's weight.

Description

Waterproof, compression-resistant and wear-resistant crosslinked polyethylene insulated power cable

Technical Field

The utility model relates to a technical field is equipped in the transmission of electricity, specifically is a waterproof, resistance to compression and wear-resisting crosslinked polyethylene insulated power cable.

Background

As the construction environment for the economic and rapid development of capital construction projects in China is more and more complicated. The demands of customers for cables for such complex topographical environments are increasing. The most used power cables on the market today are cross-linked polyethylene insulated power cables. The cross-linked polyethylene (XLPE) insulated power cable is an insulation material with the most extensive application due to its excellent electrical and mechanical physical properties, simple production process, light structure, large transmission capacity, convenient maintenance, no fall restriction and other advantages, but it is particularly sensitive to moisture, and if the insulation is impregnated with water during the manufacturing and operation processes, the cable is easy to have 'water tree' breakdown, and the service life of the cable is greatly shortened. Therefore, crosslinked polyethylene insulated cables, in particular medium-high voltage cables under the action of alternating voltage, must have a "water-blocking structure" for use in a watery or humid environment. When the cable is laid in a water-immersed or wet place, the cable is required to have a water-proof function, namely, a full water-blocking function is required, so that the situation that water is immersed in the cable to damage the cable is avoided, and the long-term stable operation of the cable under water is ensured.

In addition, in the using process of the cable, if the insulating layer and other fireproof layers outside the cable are worn or aged to cause the conductor at the center of the cable to leak, potential safety hazards can be caused, and the requirements on the wear-resisting and pressure-resisting protective performance of the cable are higher.

Disclosure of Invention

The utility model discloses not enough according to prior art provides a waterproof, resistance to compression and wear-resisting crosslinked polyethylene insulation power cable, and this cable can reach radial and vertical water-blocking effect, changes the protective sheath material and the structure of cable simultaneously, has adopted high density high rigidity polyethylene sheath material and the gear type sheath structure that gradually bursts at seams, has also strengthened the wearability of cable when improving cable compressive resistance.

In order to realize above-mentioned technical purpose, the utility model provides a technical scheme is a waterproof, resistance to compression, wear-resisting crosslinked polyethylene insulated power cable, its characterized in that: the power cable comprises at least two stranded conductors, a PP (polypropylene) filling rope, a water-blocking structure layer and a protective sleeve, wherein the at least two stranded conductors and the PP filling rope form a cable core after being crosslinked through steam, and each stranded conductor consists of a plurality of tightly pressed and stranded monofilament conductors and a crosslinked polyethylene insulating layer extruded outside the tightly pressed and stranded monofilament conductors; the water-blocking structure layer comprises a water-blocking tape waterproof layer which is radially wrapped outside the cable core and an aluminum-plastic composite tape water-proof layer which is longitudinally wrapped outside the water-blocking tape waterproof layer, and the protective sleeve is of a high-density high-hardness polyethylene protective sleeve structure with a concave-convex gear-shaped cross section.

The utility model discloses further technical scheme: the stranded conductor is formed by respectively pressing and stranding copper or aluminum alloy materials.

The utility model discloses further technical scheme: the twisted conductors are provided with three conductors, and the cross sections of the conductors are arranged in a shape of Chinese character' pin

The utility model discloses better technical scheme: the waterproof layer of the water-blocking tape is formed by lapping the water-blocking tape in an overlapped radial direction.

The utility model has the advantages that:

(1) the cable in the utility model is added with the water-blocking tape and the double-layer water-blocking structure of the longitudinal aluminum-plastic-coated composite tape on the basis of the common copper (aluminum and aluminum alloy) core crosslinked polyethylene insulated power cable to achieve the radial and longitudinal water-blocking effect, the cable is soaked in water for 72 hours, and the outer surface of the insulating layer is dry without any visible water vapor and water stain trace by naked eye observation;

(2) the utility model changes the protective sleeve material and structure of the cable, adopts the high-density high-hardness polyethylene sheath material and the involute gear type sheath structure, improves the pressure resistance of the cable, and simultaneously enhances the wear resistance of the cable, when the cable is deformed by 0.4mm displacement, the pressure resistance reaches more than 500N and is consistent with the pressure resistance of a common armored power cable, thus being capable of adapting to more use occasions;

(3) the utility model discloses a gear type sheath structure that gradually bursts at seams replaces ordinary armor, has alleviateed the weight of cable and has reduced the degree of difficulty of laying of cable.

Drawings

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

fig. 2 is a flow chart of the preparation process of the present invention.

In the figure: the cable comprises 1-stranded conductor, 2-crosslinked polyethylene insulating layer, 3-PP filling rope, 4-waterproof water-blocking tape layer, 5-water-blocking aluminum-plastic composite tape layer and 6-protective sleeve.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 is a drawing of an embodiment, which is drawn in a simplified manner and is only used for the purpose of clearly and concisely illustrating an embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "inside" and "outside" are used to indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the product of the present invention is usually placed when in use, or the position or positional relationship that a person skilled in the art would conventionally understand, and are only used for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

The embodiment provides a waterproof, compression-resistant and wear-resistant cross-linked polyethylene insulated power cable, as shown in fig. 1, which comprises three stranded conductors 1, a PP filling rope 3, a water-blocking structure layer and a protective sleeve 6, wherein the three stranded conductors 1 and the PP filling rope 3 form a cable core after being cross-linked through steam, the cross sections of the three stranded conductors 1 are in a shape of Chinese character 'pin' after being twisted, each stranded conductor 1 is a conductor formed by tightly pressing and twisting a plurality of copper wires or a plurality of aluminum alloy materials, and a cross-linked polyethylene insulating layer 2 is extruded outside the plurality of tightly pressed and twisted monofilament conductors; the waterproof structure layer comprises a waterproof water tape layer 4 and an aluminum-plastic composite tape water-resisting layer 5, wherein the waterproof water tape layer 4 is wrapped outside the cable core in the radial direction, the aluminum-plastic composite tape water-resisting layer 5 is longitudinally wrapped outside the waterproof water tape layer 4, the waterproof water tape layer 4 is formed by overlapping waterproof tapes in the radial direction, and the protecting jacket 6 is of a high-density high-hardness polyethylene jacket structure with a concave-convex gear-shaped cross section.

The utility model discloses a preparation flow is as shown in fig. 2, at first strand copper wire conductor or aluminium alloy wire conductor with copper pole or aluminium alloy pole wire drawing, later with many copper wire conductor or aluminium alloy wire conductor transposition back crowded package crosslinked polyethylene insulating layer 2 formation single stranded conductor 1, and after passing through steam crosslinking with three same stranded conductor 1, pack into the cable through PP packing rope 3 again and constitute the cable core, then at cable core external diameter to around the band block, its band block is compound around the package multilayer, form band block waterproof layer 4, rethread aluminium-plastic composite tape indulges the package and forms aluminium-plastic composite tape water barrier 5, adopt high density high hardness polyethylene to extrude the high density high hardness polyethylene lag 6 that forms the cross-section for the ragged wheel form through the extrusion die that the cross-section is ragged wheel type at last.

Soaking the power cable prepared in the embodiment in water for 72h, and observing by naked eyes, wherein the outer surface of the insulating layer is dried and has no visible water vapor and water stain traces; then when the cable is deformed by 0.4mm displacement, the compressive resistance of the cable reaches more than 500N and is consistent with that of a common armored power cable, so that the cable can adapt to more use occasions. The utility model discloses the lag uses special mould to process into unsmooth gear type structure man-hour, has increased certain stand wear and tear ability when making it possess traditional steel band armor power cable's compressive resistance again, has still reduced power cable's weight.

The above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a waterproof, resistance to compression, wear-resisting crosslinked polyethylene insulated power cable which characterized in that: the power cable comprises at least two stranded conductors (1), PP filling ropes (3), a water-blocking structure layer and a protective sleeve (6), wherein the at least two stranded conductors (1) and the PP filling ropes (3) form a cable core after being crosslinked by steam, and each stranded conductor (1) consists of a plurality of compacted and stranded monofilament conductors and a crosslinked polyethylene insulating layer (2) extruded outside the compacted and stranded monofilament conductors; the water-blocking structure layer comprises a water-blocking tape waterproof layer (4) radially wrapped outside the cable core and an aluminum-plastic composite tape water-blocking layer (5) longitudinally wrapped outside the water-blocking tape waterproof layer (4), and the protective sleeve (6) is of a high-density high-hardness polyethylene protective sleeve structure with a concave-convex gear-shaped cross section.

2. The waterproof, pressure-resistant and wear-resistant crosslinked polyethylene insulated power cable according to claim 1, characterized in that: the stranded conductor (1) is formed by respectively pressing and stranding copper or aluminum alloy materials.

3. A water-resistant, pressure-resistant, abrasion-resistant cross-linked polyethylene insulated power cable according to claim 1 or 2, characterized in that: the number of the stranded conductors (1) is three, and the cross sections of the stranded conductors are arranged in a shape like a Chinese character 'pin'.

4. A water-resistant, pressure-resistant, abrasion-resistant cross-linked polyethylene insulated power cable according to claim 1 or 2, characterized in that: the waterproof layer (4) of the water-blocking tape is formed by radially wrapping the water-blocking tape in an overlapping mode.