CN217544220U - Fireproof and waterproof medium-voltage cable - Google Patents

Abstract

The utility model relates to the technical field of cables, especially relate to a fire and water proof's middling pressure cable, current middling pressure cable fire prevention, waterproof, protection against rodents ant performance level is lower, a fire and water proof's middling pressure cable, including the transposition conductor, the transposition conductor is conductor shielding layer, insulating barrier, metallic shield, one deck water blocking tape, inner sheath, fire prevention packing, two layers water blocking tape, fire-retardant area, oxygen barrier and oversheath from inside to outside in proper order outward, the transposition conductor is the conductor that blocks water including annealing copper line and water blocking tape and surface adhesion water blocking powder, the insulating layer is water-resistant tree cross-linking polyethylene, possesses good radial water blocking and vertical water blocking performance simultaneously, meets the fire crusting, protection against rodents ant one-level, has good development prospect in cable technical field.

Description

Fireproof and waterproof medium-voltage cable

Technical Field

The utility model relates to the technical field of cables, especially, relate to a fire and water proof medium voltage cable.

Background

With the development of high-rise buildings and the improvement of fire protection grades, more and more large buildings adopt medium-voltage cross-linked cables for power supply. Correspondingly, customers put higher requirements on the flame retardance, fire resistance and moisture resistance of the medium-voltage cable, and meanwhile, in certain areas seriously damaged by rats and termites, the requirements on the rat and termite prevention performance of the cable are also higher.

The medium voltage cable produced by the current standard has simple structure without overhigh requirement in the early stage, and the medium voltage cable has common moisture-proof and waterproof performance, fireproof performance, flame retardant performance and rat and ant resistance performance and can not meet the current requirement, and the medium voltage cable is improved aiming at the problems.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned condition, for overcoming prior art's defect, the utility model provides a fire and water proof's medium voltage cable solves the lower problem of current medium voltage cable fire prevention waterproof performance grade.

The technical scheme is that the fireproof and waterproof medium-voltage cable comprises a stranded conductor, wherein the stranded conductor sequentially comprises a conductor shielding layer, an insulating shielding layer, a metal shielding layer, a water blocking tape, an inner sheath, fireproof filling, a water blocking tape, a flame retardant tape, an oxygen barrier layer and an outer sheath from inside to outside;

the stranded conductor is a water-blocking conductor which comprises an annealed copper wire and a water-blocking tape, and water-blocking powder is attached to the surface of the annealed copper wire and the water-blocking tape, and the specific mode is as follows: adding a water blocking tape in the twisting process of the annealed copper wire, and attaching water blocking powder outside a twisted conductor by using an electrostatic spraying technology to realize a good longitudinal water blocking function;

the insulating layer is made of water tree-resistant crosslinked polyethylene, the production speed of water trees is only 10 percent of that of common crosslinked insulation, and the water tree-resistant effect is good;

the conductor shielding layer, the insulating layer and the insulating shielding layer are formed by extruding in a three-layer co-extrusion mode, and the metal shielding layer is a wrapped copper strip.

Furthermore, the fireproof filling is fireproof mud comprising magnesium hydroxide, aluminum hydroxide and sodium silicate, the fireproof mud is prepared by uniformly mixing all component materials in proportion through a stirring machine, and then is formed by extruding and wrapping the components by using a grouting machine, the flame-retardant belt is a low-smoke halogen-free belt or a glass fiber belt, the oxygen isolation layer is ceramic polyolefin, the ceramic polyolefin has a heating 'incrustation' effect, when a fire disaster occurs, the internal conductor and an external fire source of the cable are quickly incrusted and separated, and meanwhile, the fireproof mud can also form a hard 'shell' after being heated, so that the physical ability of the cable can be effectively protected, and the fireproof performance is enhanced.

Furthermore, the first water-blocking tape and the second water-blocking tape are semiconductive water-blocking expansion tapes and are formed in a wrapping mode, so that a good radial water-blocking function is realized.

Furthermore, the inner sheath is a polyethylene sheath which is a good waterproof material, the water permeation rate per unit area is only about 1/10 of that of a polyvinyl chloride material adopted in a common cable, the inner sheath has a radial water-blocking function, and the inner sheath is combined with a water-blocking tape, a water-blocking conductor with a longitudinal waterproof function and a water-resistant tree material insulating layer, so that the purpose of being superior to the waterproof performance of a medium-voltage cable structure on the market is achieved, and the waterproof performance is improved.

Furthermore, the outer sheath is a special low-smoke halogen-free polyolefin sheath for rat prevention and termite prevention flame retardation of B1 level, can play a good rat prevention and termite prevention effect by adding an environment-friendly repellent, enables the flame retardation of the cable to reach the B1 level flame retardation effect by adding a halogen-free flame retardant and the integral structural design of the cable, and is formed by extruding.

The technical effects of the utility model are that, possess following three kinds of performances simultaneously: 1. the fireproof structure which can be heated and crusted in the combined form of fireproof filling and oxygen-isolating layer ceramic polyolefin can effectively protect the cable body. Good fireproof performance is achieved; 2. the stranded conductor with the longitudinal waterproof function is combined with the water-blocking tape with the radial waterproof function, and meanwhile, the stranded conductor is matched with the insulating layer with a good waterproof tree effect, so that good waterproof and moistureproof performances are achieved; 3. the outer sheath of the rat-proof and termite-proof flame-retardant B1-grade special low-smoke halogen-free sheath material is adopted, and the environment-friendly repellent is added, so that good rat-proof and termite-proof effects can be achieved. The halogen-free flame retardant is added and the overall structural design of the cable is adopted, so that the flame retardant property of the cable reaches the B1-level flame retardant effect; therefore, the existing medium-voltage cable is improved to meet the requirements of supplying power to more and more large buildings and preventing rats and ants in special areas.

Drawings

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

In the figure: 1. the cable comprises a stranded conductor, 2 conductor shielding layers, 3 insulating layers, 4 insulating shielding layers, 5 metal shielding layers, 6 water-blocking tapes, 7 inner sheaths, 8 fireproof filling layers, 9 water-blocking tapes, 10 flame-retardant tapes, 11 oxygen-isolating layers and 12 outer sheaths.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element 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," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, 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 by those skilled in the art according to specific situations.

The first embodiment is as follows: as shown in fig. 1, the fireproof and waterproof medium-voltage cable comprises a stranded conductor 1, wherein the stranded conductor 1 sequentially comprises a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a metal shielding layer 5, a first water-blocking tape 6, an inner sheath 7, fireproof filling 8, a second water-blocking tape 9, a flame-retardant tape 10, an oxygen barrier layer 11 and an outer sheath 12 from inside to outside;

the stranded conductor 1 is a water-blocking conductor which comprises an annealed copper wire and a water-blocking tape, wherein water-blocking powder is attached to the surface of the annealed copper wire and the water-blocking tape, and the specific mode is as follows: adding a water blocking tape in the twisting process of the annealed copper wire, and attaching water blocking powder outside a twisted conductor by using an electrostatic spraying technology to realize a good longitudinal water blocking function;

the insulating layer 3 is made of water tree resistant crosslinked polyethylene, the production speed of water trees is only 10% of that of common crosslinked insulation, and the water tree resistant effect is good;

the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are formed by extruding in a three-layer co-extrusion mode, and the metal shielding layer 5 is a wrapped copper strip.

In the second embodiment, on the basis of the first embodiment, the fireproof filling 8 is made of fireproof mud including magnesium hydroxide, aluminum hydroxide and sodium silicate, the fireproof mud is prepared by uniformly mixing the components in proportion through a stirrer, and then is extruded by using a grouting machine, the flame-retardant belt 10 is a low-smoke halogen-free belt or a glass fiber belt, the oxygen-insulating layer 11 is ceramic polyolefin, the ceramic polyolefin has a heating "crust" effect, when a fire disaster occurs, the ceramic polyolefin quickly crust separates a cable inner conductor and an external fire source, meanwhile, the fireproof mud can form a hard "shell" after being heated, the cable body can be effectively protected, and the fireproof performance is enhanced, the first water-blocking belt 6 and the second water-blocking belt 9 are semiconductive water-blocking expansion belts and are formed in a wrapping mode to achieve a good radial water-blocking function, the inner sheath 7 is a polyethylene sheath, the polyethylene sheath is a good waterproof material, the moisture permeation rate per unit area is only about 1/10 of a polyvinyl chloride material adopted in a common cable, the radial water-blocking function of achieving a longitudinal waterproof effect with a waterproof function of a waterproof function and a waterproof function of a waterproof sheath, the polyethylene sheath is superior to a rat-proof sheath, and a fire-proof cable with a fire-proof structure of a halogen-proof cable type cable with a halogen-resistant material of a halogen-resistant and a fire-resistant waterproof structure of a fire-resistant cable type cable with a fire-resistant and a fire-resistant structure of a fire-resistant rat-resistant type cable type.

The technical effect of the utility model is that, possess following three kinds of performance simultaneously: 1. the fireproof structure which can be heated and crusted in the combined form of fireproof filling and oxygen-isolating layer ceramic polyolefin can effectively protect the cable body. Good fireproof performance is achieved; 2. the stranded conductor with the longitudinal waterproof function is combined with the water-blocking tape with the radial waterproof function, and meanwhile, the stranded conductor is matched with the insulating layer with a good waterproof tree effect, so that good waterproof and moistureproof performances are achieved; 3. the outer sheath of the rat-proof and termite-proof flame-retardant B1-grade special low-smoke halogen-free sheath material is adopted, and the environment-friendly repellent is added, so that good rat-proof and termite-proof effects can be achieved. The halogen-free flame retardant is added and the overall structure design of the cable is adopted, so that the flame retardant property of the cable reaches the B1 level flame retardant effect; therefore, the existing medium-voltage cable is improved to meet the requirements of supplying power to more and more large buildings and preventing rats and ants in special areas.

The present invention has been described in detail with reference to the specific embodiments and examples, but these should not be construed as limitations of the present invention. Numerous variations and modifications can be made by those skilled in the art without departing from the principles of the invention, which should also be considered as within the scope of the invention.

Claims (5)

1. A fireproof and waterproof medium-voltage cable comprises a stranded conductor (1) and is characterized in that the stranded conductor (1) sequentially comprises a conductor shielding layer (2), an insulating layer (3), an insulating shielding layer (4), a metal shielding layer (5), a water-blocking tape (6), an inner sheath (7), fireproof filling (8), two water-blocking tapes (9), a flame-retardant tape (10), an oxygen-isolating layer (11) and an outer sheath (12) from inside to outside;

the stranded conductor (1) is a water-blocking conductor which comprises an annealed copper wire and a water-blocking tape, and water-blocking powder is attached to the surface of the water-blocking tape;

the insulating layer (3) is made of water tree resistant cross-linked polyethylene.

2. A fire and water resistant medium voltage cable according to claim 1, wherein the fire-resistant filler (8) is a fire clay comprising magnesium hydroxide, aluminium hydroxide and sodium silicate, the fire retardant tape (10) is a low smoke zero halogen tape or a glass fiber tape, and the oxygen barrier layer (11) is a ceramic polyolefin.

3. A fire and water resistant medium voltage cable according to claim 1 or 2, characterized in that the water-blocking tape (6) and the water-blocking tape (9) are semiconductive water-blocking intumescent tapes.

4. A fire and water resistant medium voltage cable according to claim 1 or 2, characterized in that the inner sheath (7) is a polyethylene sheath.

5. A fire and water resistant medium voltage cable according to claim 1 or 2, characterized in that said outer sheath (12) is a low smoke zero halogen polyolefin sheath.

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