CN214476580U - Medium-voltage fireproof power cable - Google Patents

Abstract

The utility model discloses a middling pressure fire prevention power cable, its technical scheme main points are: the cable comprises a plurality of cable cores, wherein the cable cores are mutually twisted, the cable core sequentially comprises a cable core conductor, a first winding tape layer and an insulating layer from inside to outside, the insulating layer is made of ethylene propylene rubber materials, an inner winding tape layer is arranged on the outer side of the cable core and made of expanded polytetrafluoroethylene materials, a filler is filled in a gap between the inner winding tape layer and the cable core, a shielding layer is arranged on the outer side of the inner winding tape layer, a fireproof layer is arranged on the outer side of the shielding layer and is made of alumina ceramics, an outer winding tape layer is arranged on the outer side of the fireproof layer and is formed by winding polytetrafluoroethylene raw material tapes, an armor layer is arranged on the outer side of the outer winding tape layer, a sheath layer is extruded on the outer side of the armor layer, and fireproof paint is coated on the outer side of the sheath layer; the utility model provides a current power cable fire prevention, fire resistance and the relatively poor problem of waterproof nature.

Description

Medium-voltage fireproof power cable

Technical Field

The utility model belongs to the technical field of the cable technique and specifically relates to a middling pressure fire prevention power cable.

Background

With the development of economy in China, the urbanization process is accelerated, urban power load is increased year by year, and medium-voltage power cables are widely applied to power supply systems of large buildings, residential houses, hotels, hospitals and other places. In recent years, in a fire accident of a power system in China, the proportion of power supply interruption of the power system due to the fire of a power cable tends to increase, and the safety of the power system under the fire condition in a medium-voltage distribution system is particularly important. Once a fire disaster occurs, thick smoke and toxic gas are released when the common flame-retardant medium-voltage power cable is burnt, the burning delay speed is high, the rescue time is short, the loss and the casualty are large, and huge personal safety injury and property loss are caused.

The existing power cable has poor fire resistance, flame retardancy and water resistance when in use, so that a new medium-voltage fireproof power cable needs to be developed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

To the problem of mentioning in the background art, the utility model aims at providing a middling pressure fire prevention power cable to solve the current power cable fire prevention that mentions in the background art, fire resistance and waterproof nature relatively poor problem.

The above technical purpose of the present invention can be achieved by the following technical solutions:

a medium-voltage fireproof power cable comprises a plurality of cable cores, wherein the cable cores are mutually twisted, the cable cores sequentially comprise a cable core conductor, a first winding band layer and an insulating layer from inside to outside, the insulating layer is made of ethylene propylene rubber materials, the inner winding band layer is arranged on the outer side of each cable core and made of expanded polytetrafluoroethylene materials, a filler is filled in a gap between the inner winding band layer and each cable core, the filler is a water blocking rope, a shielding layer is arranged on the outer side of the inner winding band layer, a fireproof layer is arranged on the outer side of the shielding layer and made of alumina ceramics, an outer winding band layer is arranged on the outer side of the fireproof layer and made of polytetrafluoroethylene raw material band, and an armor layer is arranged on the outer side of the outer winding band layer, the outside of armor is crowded package and is had the restrictive coating, the outside coating of restrictive coating has fire prevention coating.

Furthermore, the cable core conductor is formed by twisting a plurality of strands of tinned copper wires and tinned nickel wires in a composite manner.

By adopting the technical scheme, the cable core can be ensured to have good conductivity.

Further, the first wrapping tape layer is a fire-resistant mica tape.

By adopting the technical scheme, the fire-resistant mica tape has good fire resistance and heat resistance.

Furthermore, the shielding layer is formed by mixing and weaving tinned copper wires and an aluminum foil composite tape.

Through adopting above-mentioned technical scheme, make the utility model discloses possess stronger shielding external signal interference's ability.

Furthermore, the armor layer is formed by lapping and overlapping copper strips, and the lapping and overlapping rate is not less than 70%.

Through adopting above-mentioned technical scheme, can play good support, the effect of protection for the cable.

Further, the sheath layer is a crosslinked polyethylene sheath.

By adopting the technical scheme, the cross-linked polyethylene sheath has the comprehensive properties of good mechanical property, environmental stress cracking resistance, chemical corrosion resistance, temperature resistance, creep resistance, electrical property and the like, and the temperature resistance grade is obviously improved.

To sum up, the utility model discloses mainly have following beneficial effect:

1. the utility model discloses a, through being provided with flame retardant coating and outer winding band layer in the outside of shielding layer, the flame retardant coating is alumina ceramics, alumina ceramics has better mechanical strength and high temperature resistance to light in weight, wear resistance is fabulous, is a good refractory material, outer winding band layer adopts polytetrafluoroethylene raw material area to wind to form, polytetrafluoroethylene raw material area has good corrosion-resistant, high temperature resistance's characteristic, and self-adhesion, laminating nature are good, have fine leakproofness, cooperate with the flame retardant coating to use and can guarantee that the cable has good fire prevention, fire resistance; the fireproof coating is coated on the outer side of the sheath layer, the cable has an obvious fireproof and flame-retardant effect due to the arrangement of the fireproof coating, the fireproof coating can prevent cable fire from spreading outwards, and the damage of external fire to the cable can be reduced.

2. The utility model discloses a, for the rope blocks water through setting up the filler, interior making for adopting expanded polytetrafluoroethylene material around the band layer, the rope that blocks water can absorb the inside moisture that gets into the cable, and play good supporting role to the cable, expanded polytetrafluoroethylene has porousness, the gas permeability, hydrophobicity and fabulous pliability, make the cable have good waterproof nature, the insulating layer adopts the ethylene propylene rubber material to make simultaneously, ethylene propylene rubber has good chemical resistance, electric insulation performance, impact elasticity, low temperature performance, low density and high fillibility and hot water resistance and water vapor resistance, can make it have good waterproof nature when making the insulating layer have good insulating nature.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. a cable core; 101. a cable core conductor; 102. a first wrapping tape layer; 103. an insulating layer; 2. internally winding a belting layer; 3. a filler; 4. a shielding layer; 5. a fire barrier layer; 6. externally winding a wrapping tape layer; 7. An armor layer; 8. a sheath layer; 9. a fire-retardant coating.

Detailed Description

In order to make the objects and technical solutions of the present invention clear and fully described, and the advantages thereof more clearly understood, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1, a medium voltage fireproof power cable comprises a plurality of cable cores 1, wherein the plurality of cable cores 1 are twisted with each other, the cable cores 1 sequentially comprise a cable core conductor 101, a first winding band layer 102 and an insulating layer 103 from inside to outside, the insulating layer 103 is made of ethylene propylene rubber, an inner winding band layer 2 is arranged on the outer side of each cable core 1, the inner winding band layer 2 is made of expanded polytetrafluoroethylene, a filler 3 is filled in a gap between the inner winding band layer 2 and the cable core 1, the filler 3 is a water-blocking rope, a shielding layer 4 is arranged on the outer side of the inner winding band layer 2, a fireproof layer 5 is arranged on the outer side of the shielding layer 4, the fireproof layer 5 is made of alumina ceramic, the sintering temperature of the alumina ceramic is up to 1650-1990 ℃, an outer winding band layer 6 is arranged on the outer side of the fireproof layer 5, and the outer winding band layer 6 is made of polytetrafluoroethylene raw material, the outside of outer wrap band layer 6 is provided with armor 7, and the crowded package in the outside of armor 7 has restrictive coating 8, and the outside coating of restrictive coating 8 has fire retardant coating 9, and fire retardant coating 9 adopts resin to make the film agent, joins in marriage the composite fuel material, coats in the cable surface, has obvious fire prevention flame retardant efficiency.

Referring to fig. 1, the cable core conductor 101 is formed by twisting a plurality of strands of tin-plated copper wires and tin-plated nickel wires in a composite bundle.

Referring to fig. 1, the first wrapping layer 102 is a fire resistant mica tape.

Referring to fig. 1, the shielding layer 4 is formed by weaving a composite tape of tinned copper wire and aluminum foil.

Referring to fig. 1, the armor layer 7 is formed by overlapping and lapping copper strips, and the lapping and lapping rate is not less than 70%.

Referring to fig. 1, the sheath layer 8 is a crosslinked polyethylene sheath.

The utility model discloses, flame retardant coating 5 is alumina ceramics, alumina ceramics has better mechanical strength and high temperature resistance to light in weight, wear resistance is fabulous, is a good refractory material, and outer winding band layer 6 adopts polytetrafluoroethylene raw material area to wind the package and forms, and polytetrafluoroethylene raw material area has good corrosion-resistant, high temperature resistance's characteristic, and self-adhesion, laminating nature are good, have fine leakproofness, can guarantee that the cable has good fire prevention, fire resistance with flame retardant coating 5 uses in coordination; the fireproof coating 9 is coated on the outer side of the sheath layer 8, the cable has an obvious fireproof and flame-retardant effect due to the arrangement of the fireproof coating 9, and the fireproof coating 9 can prevent a cable fire from spreading outwards and reduce the damage of the external fire to the cable; the water-blocking rope can absorb water entering the cable, the expanded polytetrafluoroethylene has porosity, air permeability, hydrophobicity and excellent flexibility, so that the cable has good water resistance, meanwhile, the insulating layer 103 is made of an ethylene propylene rubber material, and the ethylene propylene rubber has good chemical resistance, electric insulation performance, impact elasticity, low-temperature performance, low density, high filling property, hot water resistance and steam resistance, so that the insulating layer 103 has good insulativity and good water resistance.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a middling pressure fire prevention power cable, includes many cable cores (1), its characterized in that: the cable comprises a plurality of cable cores (1) which are mutually twisted, wherein each cable core (1) sequentially comprises a cable core conductor (101), a first winding band layer (102) and an insulating layer (103) from inside to outside, the insulating layer (103) is made of ethylene propylene rubber materials, an inner winding band layer (2) is arranged on the outer side of each cable core (1), the inner winding band layer (2) is made of expanded polytetrafluoroethylene materials, a filler (3) is filled in a gap between the inner winding band layer (2) and the cable core (1), the filler (3) is a water-blocking rope, a shielding layer (4) is arranged on the outer side of the inner winding band layer (2), a fireproof layer (5) is arranged on the outer side of the shielding layer (4), the fireproof layer (5) is made of alumina ceramics, and an outer winding band layer (6) is arranged on the outer side of the fireproof layer (5), outer around band layer (6) adopt polytetrafluoroethylene raw material area to form around the package, the outside of outer around band layer (6) is provided with armor (7), the crowded package in the outside of armor (7) has restrictive coating (8), the outside coating of restrictive coating (8) has fire retardant coating (9).

2. A medium voltage fire power cable according to claim 1, characterized in that: the cable core conductor (101) is formed by twisting a plurality of strands of tinned copper wires and tinned nickel wires in a composite manner.

3. A medium voltage fire power cable according to claim 1, characterized in that: the first wrapping band layer (102) is a fire-resistant mica tape.

4. A medium voltage fire power cable according to claim 1, characterized in that: the shielding layer (4) is formed by mixing and weaving tinned copper wires and aluminum foil composite tapes.

5. A medium voltage fire power cable according to claim 1, characterized in that: the armor layer (7) is formed by lapping and overlapping copper strips, and the lapping and overlapping rate is not less than 70%.

6. A medium voltage fire power cable according to claim 1, characterized in that: the sheath layer (8) is a cross-linked polyethylene sheath.

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