CN210925520U

CN210925520U - Reinforced flat pipe aluminum sheath copper core waterproof cable

Info

Publication number: CN210925520U
Application number: CN201921876193.1U
Authority: CN
Inventors: 吴惠明
Original assignee: DONGGUAN MINXING CABLES CO LTD
Current assignee: DONGGUAN MINXING CABLES CO LTD
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-07-03
Anticipated expiration: 2029-10-31

Abstract

The utility model relates to a reinforced flat tube aluminum sheath copper core waterproof cable, which comprises a wire core, wherein the outer layer of the wire core is provided with an outer sheath, the wire core is provided with a copper conductor, an XLPE insulating layer and a water-blocking layer with water absorption expansion characteristic, and the XLPE insulating layer and the water-blocking layer are sequentially coated on the outer surface of the copper conductor from inside to outside; the cable comprises a cable core and is characterized by further comprising an aluminum-plastic film wrapping tape, a water blocking tape and a PE inner sheath, wherein the aluminum-plastic film wrapping tape, the water blocking tape and the PE inner sheath sequentially wrap the cable core from inside to outside, and the aluminum-plastic film wrapping tape, the water blocking tape and the PE inner sheath are all located on the inner side of the outer sheath. The utility model discloses an adopt the initiative technique of blocking water, divide vertically to block water and radially block water and carry out comprehensive protection, can effectively prevent to produce the water branch in the XLPE insulating layer, prevent that the XLPE insulating layer from being punctured by the electricity to the service reliability of guarantee cable.

Description

Reinforced flat pipe aluminum sheath copper core waterproof cable

Technical Field

The utility model relates to a flat tub of aluminum sheath copper core waterproof cable of strenghthened type.

Background

Crosslinked polyethylene (XLPE) insulated cables have been widely used in cables because of their good electrical and mechanical physical properties, simple production process, light structure, large transmission capacity, convenient installation, laying, maintenance and protection, and no fall restriction. However, when mechanical stress or external force causes damage to the cable sheath and insulation or joint damage during laying and operation of XLPE cables, moisture or humidity can infiltrate along the longitudinal and radial gaps of the cable, causing a rapid rise in the probability of water tree formation in XLPE insulated cables at operating voltage. When the water tree grows to a certain length, the permanent electric tree defects can be caused at the tip of the water tree, and the cable insulation breakdown is caused in a short time, so that the power failure accident is caused.

In order to prevent the XLPE cable from generating water tree branches, the prior art mainly considers the modification of XLPE, and adopts a voltage stabilizer and other additives to inhibit the generation of the water tree branches, so that the cable has certain effect, but the problem is not fundamentally solved. Preventing moisture and humidity from entering XLPE cables is the fundamental way to prevent water tree branches from forming in the insulation.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an improve the weak point among the prior art, and provide a strenghthened type flat tube aluminum sheath copper core waterproof cable that can prevent the water branch production.

Therefore, the reinforced flat tube aluminum sheath copper core waterproof cable comprises a wire core, wherein the outer layer of the wire core is provided with an outer sheath, the wire core is provided with a copper conductor, an XLPE insulating layer and a water-blocking layer with water absorption expansion characteristics, and the XLPE insulating layer and the water-blocking layer are sequentially coated on the outer surface of the copper conductor from inside to outside;

the cable comprises a cable core and is characterized by further comprising an aluminum-plastic film wrapping tape, a water blocking tape and a PE inner sheath, wherein the aluminum-plastic film wrapping tape, the water blocking tape and the PE inner sheath sequentially wrap the cable core from inside to outside, and the aluminum-plastic film wrapping tape, the water blocking tape and the PE inner sheath are all located on the inner side of the outer sheath.

Further, the water-resistant layer is specifically a water-resistant aramid yarn containing super absorbent resin.

Further, the water-blocking layer is specifically a water-blocking rope or water-blocking powder.

Furthermore, the wire core is also provided with an inner semi-conductive shielding layer, the inner semi-conductive shielding layer is made of semi-conductive polyolefin, the conductive surface of the inner semi-conductive shielding layer is attached to the XLPE insulating layer, and the insulating surface of the inner semi-conductive shielding layer is attached to the copper conductor.

Furthermore, the wire core is also provided with a copper strip shielding layer, and the copper strip shielding layer is arranged between the XLPE insulating layer and the water-blocking layer.

Furthermore, the wire core is also provided with an outer semi-conductive shielding layer which is grounded, the outer semi-conductive shielding layer is made of semi-conductive polyolefin, the conductive surface of the outer semi-conductive shielding layer is attached to the copper strip shielding layer, and the insulating surface of the outer semi-conductive shielding layer is attached to the XLPE insulating layer.

Furthermore, the wire cores are provided with a plurality of wires, and the wire cores are sequentially coated by the aluminum-plastic film wrapping tape, the water blocking tape and the PE inner sheath after being twisted with one another.

Further, still include the steel wire armor, the steel wire armor cladding is in PE inner sheath surface and by the oversheath cladding.

Furthermore, the gap between the aluminum plastic film wrapping tape and the wire core is filled with fillers.

Further, the filler is specifically non-conductive water glue.

Has the advantages that:

the utility model discloses an adopt the initiative technique of blocking water, divide vertically to block water and radially block water and carry out comprehensive protection, can effectively prevent to produce the water branch in the XLPE insulating layer, prevent that the XLPE insulating layer from being punctured by the electricity to the service reliability of guarantee cable.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 shows the utility model discloses a section schematic diagram of strenghthened type plain tube aluminum sheath copper core waterproof cable.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1, the reinforced flat tube aluminum sheath copper core waterproof cable of the embodiment is of a three-core structure, and three core wires 1 are twisted with each other. Since the outer layer structures of the three wire cores 1 are the same, only one of the three wire cores is structurally described below, and the rest two wire cores are referred to without repeated description.

Referring to fig. 1, the conductor of the core 1 is a copper conductor 11, and an inner semiconductive shielding layer 12, an XLPE insulating layer 13, an outer semiconductive shielding layer 14, a copper tape shielding layer 15 and a water blocking layer 16 are sequentially laid on the outer surface of the copper conductor 11. The inner semi-conductive shielding layer 12, the outer semi-conductive shielding layer 14 and the copper strip shielding layer 15 are grounded, wherein the inner semi-conductive shielding layer 12 is made of semi-conductive polyolefin, one conductive surface of the inner semi-conductive shielding layer is attached to the XLPE insulating layer 13, the other insulating surface of the inner semi-conductive shielding layer is attached to the copper conductor 11, the influence of the surface smoothness of the copper conductor 11 is eliminated, the electric field intensity on the surface of the copper conductor 11 is increased due to the unsmooth surface, and after the inner semi-conductive shielding layer 12 is adopted, the phenomenon that the copper conductor 11 generates partial discharge to the XLPE insulating layer 13 due to the unsmooth surface of the copper.

The XLPE insulating layer 13 is used for realizing good insulation, has a remarkable temperature resistance, and can support the copper conductor 11 to transmit a large current, so that the current-carrying capacity of the conductor is high (the copper conductor 11 is in a thermally stable state when transmitting the large current, the temperature of the copper conductor is basically maintained above 60 ℃, and the temperature resistance of the XLPE insulating layer 13 can prevent fire due to the temperature of the copper conductor 11).

The material of the outer semi-conductive shielding layer 14 is the same as that of the inner semi-conductive shielding layer 12, the conductive surface of the outer semi-conductive shielding layer is attached with the copper strip shielding layer 15, and the insulating surface of the outer semi-conductive shielding layer is attached with the XLPE insulating layer 13, so that the free discharge between the copper strip shielding layer 15 and the defects such as surface cracks of the XLPE insulating layer 13 is prevented.

The copper strip shielding layer 15 is formed by wrapping the outer semi-conductive shielding layer 14 with a grounded copper strip, and is used for shielding signals and realizing electromagnetic isolation.

The water-blocking layer 16 is made of water-blocking aramid yarns containing super absorbent resin, the water-blocking aramid yarns are coated on the outer layer of the copper strip shielding layer 15 and used for achieving longitudinal water blocking, specifically, when a cable joint is damaged or a sheath is damaged under the action of external force, moisture or humidity can longitudinally penetrate along a wire core after extending to the wire core of the cable, at the moment, the water-blocking aramid yarns are arranged on the outer layer of the wire core and can absorb the moisture or humidity, so that the water-blocking aramid yarns can rapidly expand to form gel-like substances, a water seepage channel is blocked, further diffusion and extension of the moisture or humidity are stopped, and loss of the cable is reduced to the minimum.

After the longitudinal water-blocking measures are finished, radial water-blocking measures are required, and the radial water-blocking measures are mainly used for dealing with shallow water or accumulated water environments.

In this embodiment, the radial water blocking measure is implemented in three layers. The first layer is an aluminum-plastic film wrapping tape 2, and after the three wire cores 1 are twisted with each other, the three are longitudinally wrapped and fixed by the aluminum-plastic film wrapping tape 2 to form a metal barrier in the circumferential direction and prevent water or moisture from entering. The second layer is a water-blocking tape 3, the water-blocking tape 3 is coated on the outer surface of the aluminum-plastic film wrapping tape 2, and the radial opening of the cable is subjected to expansion blocking by the aid of water absorption expansion characteristics. The third layer is a PE inner sheath 4 which is made of polyethylene, and the polyethylene has water-repellent property and can be used as an outermost layer waterproof measure for water isolation.

Further, in order to enhance the mechanical strength of the cable, a steel wire armor 5 is arranged on the outer layer of the PE inner sheath 4, and the steel wire armor 5 is used for forming metal protection, so that the cable becomes a bendable solid composite body. The outer layer of the steel wire armor 5 is wrapped by a conventional outer sheath 6, the outer sheath 6 is made of PVC, and the steel wire armor has wear-resisting characteristics and can prevent a cable from being damaged by friction.

Further, in order to fill the cable, gaps between the aluminum plastic film tape 2 and the three wire cores 1 are filled with fillers 7, wherein the fillers 7 are preferably non-conductive water adhesives, and have the characteristics of viscosity and water resistance, so that the water resistance of the cable can be further enhanced.

In the embodiment, the active water blocking technology is adopted, the longitudinal water blocking and the radial water blocking are respectively adopted for comprehensive protection, the water branches generated in the XLPE insulating layer 13 can be effectively prevented, the XLPE insulating layer 13 is prevented from being electrically punctured, and therefore the use reliability of the cable is guaranteed.

It should be noted that:

the water-blocking layer 16 can also be made of water-blocking ropes or water-blocking powder, and the water-blocking ropes or the water-blocking powder have water-absorbing expansion characteristics, can expand to dozens of times of the volume of the water-blocking layer after instant water absorption, and can be used for rapidly blocking a water seepage channel. Of course, the water-blocking powder has the defect of difficult powder attachment, and the outer diameter of the cable is increased when the water-blocking rope is adopted, so the water-blocking powder and the water-blocking rope are suboptimal schemes, and the water-blocking layer 16 is preferably made of water-blocking aramid yarns.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. The utility model provides a flat tub of aluminium sheath copper core waterproof cable of strenghthened type, includes that the skin is equipped with the sinle silk of oversheath, its characterized in that:

the cable core is provided with a copper conductor, an XLPE insulating layer and a water-blocking layer with water absorption expansion characteristics, and the XLPE insulating layer and the water-blocking layer are sequentially coated on the outer surface of the copper conductor from inside to outside;

2. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 1, characterized in that: the water-resistant layer is specifically a water-resistant aramid yarn containing super absorbent resin.

3. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 1, characterized in that: the water-resistant layer is specifically a water-resistant rope or water-resistant powder.

4. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 1, characterized in that: the cable core is also provided with an inner semi-conductive shielding layer which is grounded, the inner semi-conductive shielding layer is made of semi-conductive polyolefin, one conductive surface of the inner semi-conductive shielding layer is attached to the XLPE insulating layer, and the other insulating surface of the inner semi-conductive shielding layer is attached to the copper conductor.

5. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 4, characterized in that: the wire core is also provided with a copper strip shielding layer which is grounded and arranged between the XLPE insulating layer and the water-resistant layer.

6. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 5, characterized in that: the wire core is also provided with an outer semi-conductive shielding layer which is grounded, the outer semi-conductive shielding layer is made of semi-conductive polyolefin, the conductive surface of the outer semi-conductive shielding layer is attached to the copper strip shielding layer, and the insulating surface of the outer semi-conductive shielding layer is attached to the XLPE insulating layer.

7. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 1, characterized in that: the cable core is provided with a plurality of cable cores, and the cable cores are sequentially coated with an aluminum-plastic film wrapping tape, a water blocking tape and a PE inner sheath after being twisted with each other.

8. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 7, characterized in that: the PE inner sheath is characterized by further comprising a steel wire armor, and the steel wire armor is coated on the outer surface of the PE inner sheath and is coated by the outer sheath.

9. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 7 or 8, characterized in that: and the gap between the aluminum plastic film wrapping belt and the wire core is filled with a filler.

10. The reinforced flat tube aluminum sheath copper core waterproof cable of claim 9, characterized in that: the filler is specifically non-conductive water gel.