CN215954904U - Moisture-proof power cable with good water resistance - Google Patents

Abstract

The utility model relates to the technical field of power cables, in particular to a moisture-proof power cable with good water resistance, which comprises: the cable guide core is formed by twisting a plurality of conducting wires, and an insulating layer is extruded outside the conducting wires; the filling layer is longitudinally wrapped on the outer sides of the two tangent conductive wire cores, and a wrapping layer is wrapped on the outer side of the filling layer so that the filling layer and the conductive wire cores are fixedly formed into a circular cross section; the fire retardant layer is wrapped on the outer side of the wrapping layer; the shielding layer is woven on the outer side of the fire retardant layer; an axial water-blocking rope is twisted at the axis position of the cable guide core, gap filling sections are arranged at intervals and periodically along the axial direction of the axial water-blocking rope and are used for filling gaps between the conducting wire and the insulating layer so as to block water and/or water vapor from being conducted along the longitudinal direction of the conducting wire, and the water/water vapor can be absorbed by the water gel after contacting the hydrogel along the conducting wire direction so as to block the water/water vapor from further moving along the conducting wire and achieve the effect of longitudinal blocking.

Description

Moisture-proof power cable with good water resistance

Technical Field

The utility model relates to the technical field of power cables, in particular to a moisture-proof power cable with good water resistance.

Background

Power cables are important media for transmitting and distributing electrical energy, and are commonly used in urban underground power grids, typically buried in soil or laid indoors, in trenches, tunnels. In the long-term use process, due to the influence of underground environment and temperature rise, great moisture and even accumulated water can be generated in the laying environment, although a water-blocking layer (such as waterproof yarn, non-woven fabric and the like) is usually arranged on the structural design of the cable, and is isolated and protected by an outer sheath, an inner sheath and the like, the water-blocking layer is generally considered to be good only in the radial direction of the cable, for the longitudinal water blocking of the cable, particularly for the wires which are twisted mutually, the water-blocking layer usually occurs in the cable laying process, the sealing performance of the sealing sleeve at the end of the cable is insufficient due to the lack of the sealing sleeve or the sealing sleeve manufactured on site, and moisture/water can longitudinally extend along the gaps twisted among the wires, so that the conductors are oxidized, the contact resistance among the conductors is increased, and the normal use of the cable is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a moisture-proof power cable with good water resistance, which comprises: the cable comprises a plurality of cable guide cores, a plurality of cable cores and a plurality of insulating layers, wherein the cable guide cores are arranged in a pairwise tangent mode and are wound and wrapped outside through a wrapping layer to form a cable core with a circular section; the filling layer is filled between the cable guide core and the wrapping layer; the fire retardant layer, the shielding layer and the radial water-resistant layer are sequentially arranged on the outer side of the wrapping layer; the outer sheath is wrapped and coated on the outer side of the radial water-resistant layer in an extruding way; the axial water blocking rope is twisted at the axis position of the cable guide core, and gap filling sections are arranged at intervals and periodically along the axial direction of the axial water blocking rope and are used for filling gaps between the conducting wire and the insulating layer so as to block moisture and/or water from being conducted along the longitudinal direction of the conducting wire.

Further, the length of the gap filling section is 5-15 CM, and the interval distance of the gap filling section along the axial direction is 1-2M.

Further, the gap-filling section includes a layer of hydrogel particles impregnated on the axial water-blocking cord.

Further, the hydrogel layer is squeezed and filled between the wire gaps twisted with each other in a twisted state.

Further, the radial water-blocking layer comprises water-blocking yarns.

Furthermore, a plurality of groups of convex ribs distributed in parallel are fixedly arranged on the outer surface wall of the water blocking yarn.

Furthermore, a water-blocking filling layer is arranged on the outer side of the water-blocking yarn.

Further, the water-blocking filling layer comprises hot melt adhesive or petroleum filling paste.

Compared with the prior art, the utility model has the advantages that:

the utility model provides a moisture-proof power cable with good water resistance, wherein an axial water-blocking rope is twisted at the axis position of a cable guide core, and the axial water-blocking rope is provided with gap filling sections at intervals along the axial direction and periodically for filling gaps between a lead and an insulating layer so as to block the longitudinal conduction of moisture and/or water vapor along the lead, so that the moisture/water vapor can be absorbed by the partial hydrogel after contacting the hydrogel along the lead direction, so that the moisture/water vapor is prevented from further moving along the lead, and the longitudinal blocking effect is achieved.

The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.

Drawings

The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a cut surface of a moisture-proof power cable with good water-blocking performance according to an embodiment of the present invention;

FIG. 2 is a schematic view of a hierarchical structure of a moisture-proof power cable having good water resistance according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a radial water-blocking layer in the moisture-proof power cable with good water-blocking performance according to the embodiment of the utility model;

fig. 4 is a schematic diagram of a distribution structure of gap filling sections in a conductive core of a moisture-proof power cable with good water-blocking performance according to an embodiment of the present invention.

Detailed Description

In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.

In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the utility model. It should be understood that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways with moisture-resistant, moisture-resistant power cables, as the disclosed concepts and embodiments are not limited to any embodiment. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.

The moisture-proof power cable with good water resistance is mainly applied to urban underground power grids and mainly laid in areas with large moisture, such as underground channels or tunnels, and can provide good water resistance in the radial direction of the cable and also provide good water resistance in the longitudinal direction, particularly the longitudinal direction of a wire, so that the moisture/water vapor can be prevented from being diffused for a long distance in the cable laying process (for example, the moisture enters the cable head end in field construction), and the excellent performance of the whole wire of the cable is ensured.

With reference to fig. 1 and 2, the utility model provides a technical scheme of a moisture-proof power cable with good water resistance, which comprises a cable guide core, a filling layer 4, a wrapping layer 5, a fire retardant layer 6, a shielding layer 7, a radial water-resistant layer 8 and an outer sheath 9.

The plurality of cable guide cores are arranged in a pairwise tangent mode, as shown in fig. 1, and then the cable cores are wound around the winding layer 5 to form cable cores with round sections, and the cabling process is completed.

Each cable core comprises a conductor 1 which is twisted with each other and an insulating layer 3 which is extruded outside the conductor 1.

Referring to fig. 1, an axial water-blocking rope 2 is twisted at an axial center position of the cable core, and the axial water-blocking rope 2 is provided with gap filling sections 21 at intervals and periodically along an axial direction, so as to fill a gap between the conductor 1 and the insulating layer 3, so as to block moisture and/or water from being conducted along the longitudinal direction of the conductor 1.

In a preferred embodiment, the wire 1 is a copper wire or a tin-plated copper wire.

The axial water-blocking rope 2 is a conductive fiber rope and is arranged at the axis position of the cable guide core, so that the flexibility of the cable guide core is improved.

Wherein the gap-filling section 21 comprises a layer of hydrogel particles that is impregnated onto the axial water-blocking cord 2. As the surface of the conductive fiber rope is porous, the conductive fiber rope can easily absorb hydrogel to form a hydrogel layer. Specifically, the gap filling section 21 used in the present invention employs a commercially available gel layer having a hydrophilic three-dimensional network structure as a water blocking layer, and swells and retains water molecules by crosslinking the network. The gap is filled by arranging a particle layer in the preset segmented interval.

In the preparation process, in the stranding process of the wires 1, the conductive fiber rope is pulled by a tractor, 18 strands of wire coils are distributed on a lapping machine and used for stranding the wires 1 outside the conductive fiber rope and extruding the insulating layer 3 to form a cable guide core, the insulating layer 3 can be made of PVC (polyvinyl chloride) plastics or crosslinked plastic materials, the conductive fiber rope penetrates through a containing box filled with gel particles at the front section of the stranding step in the paying-off process, the upper end face of the containing box is open, the upper part of the containing box is provided with a pressing wheel capable of reciprocating up and down and pressing the conductive fiber rope to the containing box, the conductive fiber rope can be pressed down discontinuously by the pressing wheel through the pressing wheel and is soaked with the gel particles, and therefore, a gap filling section 21 is formed on the conductive fiber rope.

Further, as shown in fig. 4, the length of the gap filling section 21 is 5-15 CM, the distance between the gap filling sections 21 in the axial direction is 1-2M, hydrogel is extruded and filled between the twisted conductor gaps in the twisted state, and the gap filling sections 21 distributed at intervals can avoid the increase of resistance caused by the small contact area between the conductors 1 due to the filling of a water blocking medium (hydrogel) between the conductors 1.

Therefore, when the cable is laid, the coiled cable is cut off, so that a new end which is not protected is formed on the cable, water enters or is affected by damp due to water entering in the cable trench in the dragging process or poor sealing of a temporarily manufactured sealing sleeve, and moisture/steam is absorbed by the partial hydrogel after contacting the hydrogel along the direction of the lead 1, so that the moisture/steam is prevented from further moving along the lead 1, and the longitudinal cut-off effect is achieved.

With reference to fig. 1-3, the filling layer 4 is longitudinally wrapped on the outer sides of every two tangent conductive wire cores, the outer side of the filling layer 4 is wrapped with the wrapping layer 5, so that the filling layer 4 and the conductive wire cores form a circular cross section, the fire retardant layer 6 is wrapped on the outer side of the wrapping layer 5, and the shielding layer 7 is woven on the outer side of the fire retardant layer 6.

In optional embodiment, the conductive core sets up to three groups, and two liang tangents of three group conductive core, back packing layer 4 can adopt the back-fire relief filler rope, indulge the package and fill in two liang tangents three group conductive core outsides and central point and put, make the cable more round, and play certain fire prevention effect, can adopt the polyester area to wrap the outside at back-fire relief filler rope around covering 5, be used for wrapping back-fire relief filler rope, back-fire relief layer 6 can adopt the mica area, wrap the outside at covering 5 around, good high temperature resistance and fire resistance have, shielding layer 7 can adopt the aluminium foil and weave the copper mesh combination that density is 80% -90%, mainly play the effect of shielding electric field.

Referring to fig. 2 and 3, the radial water-blocking layer 8 wraps the outer side of the shielding layer 7, and the outer sheath 9 wraps the outer side of the radial water-blocking layer 8 in an extruding manner.

In an optional embodiment, the radial water-blocking layer 8 may be wrapped outside the shielding layer 7 by water-blocking yarns, the water-blocking yarns have a strong water absorption effect and can prevent moisture/steam from continuously diffusing radially, and the outer sheath 9 may be made of flame-retardant polyethylene or silicone rubber.

Wherein, the fixed protruding muscle 81 that is provided with multiunit parallel distribution of the exterior wall of the yarn that blocks water, and the outside of the yarn that blocks water is equipped with the filling layer 82 that blocks water, protruding muscle 81 is the rib that the winding of dacron yarn formed, can increase the roughness on yarn surface that blocks water, be favorable to the adhering to of the filling layer 82 that blocks water, can also form the wall on vertical, slow down moisture/aqueous vapor longitudinal movement, the filling layer 82 that blocks water includes hot melt adhesive or oil filling paste, utilize its hydrophobic property, 9 damaged points at the overcoat directly keep apart moisture/aqueous vapor, make it unable entering cable body, play radial separation effect.

With the above embodiment, the axial water-blocking rope 2 is twisted at the axial center of the cable core, the axial water-blocking rope 2 is provided with gap filling sections 21 at intervals and periodically along the axial direction for filling the gap between the conductor 1 and the insulating layer 3 to block the moisture and/or the water vapor from being conducted along the longitudinal direction of the conductor 1, so that the moisture/the water vapor can be absorbed by the partial hydrogel after contacting the hydrogel along the direction of the conductor 1 to block the moisture/the water vapor from further moving along the conductor 1, thereby achieving the effect of longitudinal blocking.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (8)

1. A moisture-proof power cable with good water resistance is characterized by comprising:

the cable comprises a plurality of cable guide cores, a plurality of cable cores and a plurality of insulating layers, wherein the cable guide cores are arranged in a pairwise tangent mode and are wound and wrapped outside through a wrapping layer to form a cable core with a circular section;

the filling layer is filled between the cable guide core and the wrapping layer;

the fire retardant layer, the shielding layer and the radial water-resistant layer are sequentially arranged on the outer side of the wrapping layer;

the outer sheath is wrapped and coated on the outer side of the radial water-resistant layer in an extruding way;

the axial water blocking rope is twisted at the axis position of the cable guide core, gap filling sections are periodically arranged at intervals along the axial direction of the axial water blocking rope, gaps between the conducting wires and the insulating layer are filled, and the longitudinal conduction of moisture and/or water vapor along the conducting wires can be blocked.

2. The moisture-proof power cable with good moisture resistance as claimed in claim 1, wherein the length of the gap filling section can be designed to be 5-15 CM, and the gap filling section can be spaced apart from 1-2M in the axial direction.

3. The moisture-resistant power cable with good water-blocking properties as recited in claim 1, wherein the gap-filling section comprises a layer of hydrogel particles impregnated on the axial water-blocking cord.

4. The moisture-proof power cable with good moisture resistance as claimed in claim 3, wherein the hydrogel particle layer is compressed and filled between the conductor gaps twisted with each other in a twisted state.

5. The moisture-resistant power cable with good water-blocking property of claim 1, wherein the radial water-blocking layer comprises water-blocking yarn.

6. The moisture-proof power cable with good water blocking performance as claimed in claim 5, wherein a plurality of sets of parallel ribs are fixed on the outer surface of the water blocking yarn.

7. The moisture-proof power cable with good water-blocking property as claimed in claim 6, wherein a water-blocking filling layer is provided outside the water-blocking yarn.

8. The moisture-proof power cable with good water-blocking property as claimed in claim 7, wherein the water-blocking filling layer comprises a hot melt adhesive or a petroleum filling paste.

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