CN219575228U

CN219575228U - Flame-retardant waterproof environment-friendly medium-voltage power cable

Info

Publication number: CN219575228U
Application number: CN202223396102.9U
Authority: CN
Inventors: 王小新; 陈玺; 许兴刚
Original assignee: FEIZHOU GROUP CO LTD
Current assignee: FEIZHOU GROUP CO LTD
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-08-22
Anticipated expiration: 2032-12-14

Abstract

The utility model discloses a flame-retardant waterproof environment-friendly medium-voltage power cable, which comprises a cable core, a radial waterproof layer, a flame-retardant oxygen-insulating layer, a heat-insulating protective layer and an outer protective layer; the cable core comprises three metal shielding insulating wire cores and a filling frame, wherein the three metal shielding insulating wire cores are mutually stranded, and the filling frame is filled in the area between the three metal shielding insulating wire cores; each metal shielding insulating wire core comprises a conductor, and the periphery of the conductor is sequentially coated with a conductor shielding layer, a plastic insulating layer, an insulating shielding layer and a metal shielding layer from inside to outside; the periphery of the cable core is sequentially coated with a radial waterproof layer, a flame-retardant oxygen-insulating layer, a heat-insulating protective layer and an outer protective layer from inside to outside. The cable has smaller outer diameter and better flame retardance, waterproof performance and environmental protection performance.

Description

Flame-retardant waterproof environment-friendly medium-voltage power cable

Technical Field

The utility model relates to a power cable, in particular to a flame-retardant waterproof environment-friendly medium-voltage power cable.

Background

The medium-voltage power cable is widely used, and occupies an important position in a power system, and because the cable is large and heavy, the cable is extremely easy to be subjected to the action of external force in the installation and laying process, when the cable outer protective layer is damaged locally, if the cable outer environment is wet or water exists in the cable circuit, external moisture or water enters the cable and can influence the normal operation of the circuit.

However, the waterproof structure of the present medium-voltage waterproof power cable is generally a waterproof layer outside a cable core, the waterproof layer is specifically a combined structure of a waterproof tape (inner) +a polyethylene sheath (outer), and because the structure is arranged on the periphery of the cable core, the polyethylene sheath of the non-armored cable is also easy to be damaged due to the action of external force, when external moisture or water enters the waterproof tape in the non-armored cable, the waterproof tape can effectively block the water outside, but because the cable runs for a long time to generate heat, the waterproof tape material can slowly age and lose efficacy under a certain high temperature, and the external moisture or water enters the cable, so that the normal running of the cable is finally affected.

Disclosure of Invention

Aiming at the problems of flame retardance and water resistance of the traditional medium-voltage waterproof power cable, the utility model aims to provide the flame retardance and water resistance environment-friendly medium-voltage power cable which has better flame retardance, water resistance and environment friendliness and can effectively overcome the problems in the prior art.

In order to achieve the aim, the flame-retardant waterproof environment-friendly medium-voltage power cable comprises a cable core, a radial waterproof layer, a flame-retardant oxygen-insulating layer, a heat-insulating protective layer and an outer protective layer;

the cable core comprises three metal shielding insulating wire cores and a filling frame, wherein the three metal shielding insulating wire cores are mutually stranded, and the filling frame is filled in the area between the three metal shielding insulating wire cores;

each metal shielding insulating wire core comprises a conductor, and the periphery of the conductor is sequentially coated with a conductor shielding layer, a plastic insulating layer, an insulating shielding layer and a metal shielding layer from inside to outside;

the periphery of the cable core is sequentially coated with a radial waterproof layer, a flame-retardant oxygen-insulating layer, a heat-insulating protective layer, a waterproof layer and an outer protective layer from inside to outside.

In a preferred embodiment of the utility model, the filling frame is a halogen-free low-smoke elastomer triangular filling bar, and the edges of the filling bar are respectively in tangential contact with the metal shielding insulating wire core.

In a preferred embodiment of the utility model, the radial waterproof layer is formed by extruding polyethylene sheath material on the cable core.

In a preferred embodiment of the utility model, the flame-retardant oxygen-insulating layer is formed by extruding fireproof mud on a radial waterproof layer.

In a preferred embodiment of the utility model, the thermal insulation protection layer is formed by overlapping wrapped thermal insulation protection strips.

In a preferred embodiment of the utility model, the water-blocking layer is constituted by overlapping wrapped insulating water-blocking tapes.

In a preferred embodiment of the present utility model, the outer sheath may be an extruded halogen-free low smoke flame retardant polyolefin outer sheath.

In a preferred embodiment of the present utility model, the outer sheath may be a composite structure of a metal armor layer and an outer extruded halogen-free low smoke flame retardant polyolefin outer sheath.

The beneficial effects of the utility model are as follows:

the flame-retardant waterproof environment-friendly medium-voltage power cable provided by the utility model has better flame retardance, waterproof performance and environment-friendly performance, and can effectively overcome the problems existing in the prior art.

The flame-retardant waterproof environment-friendly medium-voltage power cable provided by the utility model has a smaller overall outer diameter.

Drawings

The utility model is further described below with reference to the drawings and the detailed description.

Fig. 1 is a cross-sectional illustration of a flame retardant waterproof environmentally friendly medium voltage power cable in an example of the utility model.

Detailed Description

The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the utility model easy to understand.

Referring to fig. 1, an example of a flame-retardant waterproof environment-friendly medium voltage power cable is shown.

As can be seen from the figure, the flame-retardant waterproof environment-friendly medium voltage power cable provided by the present example is mainly composed of a cable core 300, a radial waterproof layer 400, a flame-retardant oxygen-insulating layer 500, a heat-insulating protective layer 600 and an outer protective layer 700.

The cable core 300 in this example mainly includes three metal shielding insulating wire cores 100 and a filling frame 200.

The three metal shielding insulating wire cores 100 are distributed in a triangle shape and are twisted with each other; at the same time, the filling frame 200 fills in the gaps between the three metal shielding insulated wire cores 100, thereby cooperating with the three metal shielding insulated wire cores 100 to form the corresponding cable cores 300.

In some embodiments of the present example, the metal shielding insulated wire core 100 specifically includes a conductor 110, and a conductor shielding layer 120, a plastic insulating layer 130, an insulating shielding layer 140 and a metal shielding layer 150 are sequentially coated on the periphery of the conductor 110 from inside to outside.

The conductor 110 is preferably a 2 nd compressed round stranded conductor.

Meanwhile, the conductor shielding layer 120, the plastic insulating layer 130 and the insulating shielding layer 140 are particularly preferably co-extruded on the conductor 110 through three layers, so that the insulating structure is stable, and the insulation of the conductor 110 can be ensured.

The metal shielding layer 150 is preferably formed on the insulating shielding layer 140 by overlapping and wrapping copper strips, which is used for uniform electric field, shielding external electromagnetic interference, and carrying short-circuit current.

In some embodiments of the present example, the filler frame 200 is preferably a halogen-free low smoke elastomer delta filler strip that reduces the effects of forces between the metallic shielded insulated wire cores 100.

Specifically, when the triangular filling strip is matched with the metal shielding insulating wire core 100, each piece of the triangular filling strip is in a circular arc shape matched with the metal shielding insulating wire core 100, and therefore each side of the triangular filling strip is respectively contacted with the surface of each metal shielding insulating wire core 100 in a tangent manner. The filling frame 200 thus arranged can fix the metal shielding layer 150, and is not loose and stable in structure even if the outer unprotected tape of the cable core is fastened.

For the cable core 300 constructed as described above, the present example further sequentially coats the radial waterproof layer 400, the flame-retardant oxygen-insulating layer 500, the heat-insulating protective layer 600 and the outer sheath 700 from inside to outside at the outer periphery of the cable core 300, thereby forming the flame-retardant waterproof environment-friendly medium voltage power cable.

In some embodiments of the present example, the radial waterproof layer 400 is specifically formed by vacuum-pumping extruded tube-like extrusion of polyethylene sheath material onto the cable core 300.

The radial waterproof layer 400 in this example is a compact plastic sleeve structure, and is substantially non-absorbent after encountering water, so that external moisture and humidity can be effectively prevented from entering the cable core 300 radially, corrosion of the flame-retardant oxygen-insulating layer 500 to the metal shielding insulating wire core 100 can be prevented, and the radial waterproof performance is good.

Specifically, the radial waterproof layer 400 formed by the polyethylene sheath material is tightly wrapped on the outer surface of the cable core 300, and is fully contacted with the metal shielding insulating wire core 100 but is not adhered.

As a further preferred scheme, the radial waterproof layer 400 is further formed with a plurality of uniformly distributed serration on the outer surface, wherein the serration is about 80% of the effective thickness of the radial waterproof layer 400, and the width of the serration is equal to the width of the groove and is 1.5-3 times of the height of the serration. Therefore, the radial waterproof layer 400 has good heat conduction performance, can absorb heat and transfer the heat to the metal shielding insulating wire core 100 when the cable burns, can effectively reduce the degree of insulation burnt, slows down the temperature rise of the external environment when burning, and has good flame retardant property from the surface.

In some embodiments of the present example, the flame retardant oxygen barrier layer 500 is formed by extrusion of fire clay over the radial waterproof layer 400.

The flame-retardant and oxygen-insulating layer 500 is crossed and matched with the radial waterproof layer 400, so that the flame-retardant and oxygen-insulating layer 500 can be ensured to have stable structure and uniform thickness. Meanwhile, the flame-retardant oxygen-insulating layer 500 formed by extrusion-type extrusion of fireproof mud is also used as a round filling part for forming the cable core 100, and because the thickness outside the radial waterproof layer 400 is very thin, when the cable is bent, the cable is mainly stressed by the metal shielding insulating wire core 100 and the radial waterproof layer 400 of the cable, and the stress of the flame-retardant oxygen-insulating layer 500 is smaller, so that the whole cable is not hardened and the bending performance of the cable is not influenced by the structure of the flame-retardant oxygen-insulating layer 500.

As an example, the fireproof mud in this example is specifically formed by mixing liquid sodium silicate with inorganic mineral powder, wherein the inorganic mineral powder can be one or two of magnesium hydroxide or aluminum hydroxide, and the structure is harder and has a certain external force resistance effect; the flame-retardant oxygen-insulating layer 500 covers the whole outer surface of the radial waterproof layer 400, can effectively protect the radial waterproof layer 400 from being damaged when the flame-retardant oxygen-insulating layer 500 is acted by external force, can separate out water when the cable burns, and has obvious effect on cooling the cable core; furthermore, as the main component of the structure is inorganic mineral substances, the structure becomes a hard shell after burning, has better effects of flame retardance, oxygen isolation, heat insulation and fire prevention, and can effectively slow down the burning degree of the metal shielding insulating wire core 100.

In some embodiments of the present example, the non-metal materials used for the radial waterproof layer 400, the flame retardant oxygen insulation layer 500, the thermal insulation protection layer 600 and the outer protection layer 700 are halogen-free low smoke materials, so that the present utility model has better environmental protection performance.

In addition, in the flame-retardant waterproof environment-friendly medium-voltage power cable provided by the embodiment, the metal shielding layer 150, the radial waterproof layer 400, the flame-retardant oxygen-insulating layer 500, the heat-insulating protective layer 600 and the outer coating layer 700 are all made of flame-retardant materials, so that the flame-retardant cable has better flame retardant performance.

Furthermore, in the flame-retardant waterproof environment-friendly medium-voltage power cable provided by the embodiment, the periphery of the metal shielding insulating wire core 100 of the cable core 300 is not filled with the filler, but the radial waterproof layer 400 and the flame-retardant oxygen-insulating layer 500 are combined together, so that the waterproof and flame-retardant effects are fully exerted, and the outer diameter of the cable is effectively reduced.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The flame-retardant waterproof environment-friendly medium-voltage power cable is characterized by comprising a cable core, a radial waterproof layer, a flame-retardant oxygen-insulating layer, a heat-insulating protective layer and an outer protective layer;

the periphery of the cable core is sequentially coated with a radial waterproof layer, a flame-retardant oxygen-insulating layer, a heat-insulating protective layer and an outer protective layer from inside to outside.

2. The flame-retardant waterproof environment-friendly medium-voltage power cable according to claim 1, wherein the filling frame is a halogen-free low-smoke elastomer triangular filling strip, and edges of the filling strip are respectively in tangential contact with the metal shielding insulating wire core.

3. The flame-retardant waterproof environment-friendly medium-voltage power cable according to claim 1, wherein the radial waterproof layer is formed by extruding polyethylene sheath material on a cable core.

4. The flame-retardant waterproof environment-friendly medium-voltage power cable according to claim 1, wherein the flame-retardant oxygen-insulating layer is formed by extruding fireproof mud on a radial waterproof layer.

5. The flame-retardant waterproof environment-friendly medium voltage power cable according to claim 1, wherein the heat insulation protection layer is formed by overlapped and wrapped heat insulation protection belts.

6. The flame retardant, waterproof, environmentally friendly medium voltage power cable of claim 1 wherein the outer jacket is an extruded halogen-free, low smoke flame retardant polyolefin jacket.

7. The flame-retardant, waterproof and environment-friendly medium-voltage power cable according to claim 1, wherein the outer protective layer can be a composite structure of a metal armor layer and a halogen-free low-smoke polyolefin flame-retardant outer sheath extruded outside the metal armor layer.