CN214671968U

CN214671968U - Fire-resistant waterproof type medium-voltage crosslinked polyethylene insulated environment-friendly power cable

Info

Publication number: CN214671968U
Application number: CN202121027339.2U
Authority: CN
Inventors: 刘伟; 唐俊; 彭欣欣
Original assignee: Hunan Valin Wire and Cable Co Ltd
Current assignee: Hunan Valin Wire and Cable Co Ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-11-09
Anticipated expiration: 2031-05-12

Abstract

The utility model discloses a fire-resistant waterproof type middling pressure crosslinked polyethylene insulation environmental protection power cable, including conductor shield, crosslinked polyethylene and the insulation shielding three-layer insulation core of crowded formation outside the conductor altogether, insulation core has the copper strips as the shielding layer around wrapping outward, three have the shielding layer insulation core strands into the cable core, it has the glass fiber rope layer to fill in the cable core, the cable core is wrapped around ceramic silicon rubber area outward and is regarded as first flame retardant coating, first flame retardant coating is outer to be indulged outward and is wrapped the autohension aluminium-plastic tape as the waterproof layer, the high fire-retardant oxygen material of crowded package outward of waterproof layer is as the second flame retardant coating, the outer crowded package pottery polyolefin material of second flame retardant coating is as third flame retardant coating, the outer package pottery silicon rubber area of third flame retardant coating is as the enhancement layer, the outer crowded package low smoke material of enhancement layer is as the halogen-free oversheath. The problem of poor fire resistance and flame retardant property of the cable is solved.

Description

Fire-resistant waterproof type medium-voltage crosslinked polyethylene insulated environment-friendly power cable

Technical Field

The utility model relates to a fire resisting cable field especially relates to an insulating environmental protection power cable of fire-resistant waterproof type middling pressure crosslinked polyethylene.

Background

At present, medium-voltage cross-linked polyethylene insulated power cables familiar to people are formed by simultaneously extruding a conductor shield, a cross-linked polyethylene insulator and an insulation shield outside a conductor core to form an insulated wire core, winding a shielding copper strip, filling common non-hygroscopic fillers to form a cable, winding the non-hygroscopic winding tape to tighten the cable, and extruding an outer sheath. The cable can not be used in important places such as high-rise buildings, exhibition centers, subways, power plants, nuclear power stations, tunnels and the like with higher fire safety requirements. Patent CN202022249737.0 discloses a waterproof and fire-resistant medium-voltage crosslinked polyethylene cable for tunnel, which has good tensile property and fire resistance, but the processing technology is complex, the cost is too high, and the mass production is not facilitated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire-resistant waterproof type middling pressure crosslinked polyethylene insulation environmental protection power cable to solve the poor problem of cable fire resistance and fire behaviour.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a fire-resistant waterproof type middling pressure crosslinked polyethylene insulation environmental protection power cable, includes conductor shield, crosslinked polyethylene and the insulation shielding three-layer insulation core of coextruding formation outside the conductor, insulation core winds outward and has the copper strips as the shielding layer, and three have the shielding layer insulation core transposition becomes the cable core, it has glass fiber rope layer to fill in the cable core, the cable core winds outward and wraps ceramic silicon rubber area as first flame retardant coating, the outer vertical package autohension plastic-aluminum area of first flame retardant coating is as the waterproof layer, the outer crowded high fire-retardant oxygen insulation material of wrap of waterproof layer is as the second flame retardant coating, the outer crowded package pottery polyolefin material of second flame retardant coating is as third flame retardant coating, the outer package pottery silicon rubber area of third flame retardant coating is as the enhancement layer, the outer crowded package of enhancement layer is steamed low smoke material as the oversheath.

As a further improvement of the above technical solution:

the roundness of the cable core at least reaches 98 percent.

The conductor adopts a tin-plated copper core material. By adopting the tinned copper core conductor, copper corrosion and color change can be prevented, the conductivity of the cable is improved, the comprehensive performances such as mechanical property, environmental stress cracking resistance, chemical corrosion resistance, creep resistance, electrical property and the like are obviously improved through the structure, and the temperature resistance grade is obviously improved.

The first fireproof layer and the reinforcing layer are opposite in wrapping direction. Positive and negative can guarantee that whole cable is round even around the package, makes crowded package thickness keep unanimous, guarantees the performance of cable.

The extrusion thickness of the third fire prevention layer is 3.0mm-4.0 mm. The ceramic polyolefin material cable forms a ceramic honeycomb-shaped hard shell when being burnt by high-temperature flame, and can well play a role in heat dissipation and heat insulation.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses an insulating environmental protection power cable of fire-resistant waterproof type middling pressure crosslinked polyethylene adopts the fine rope of glass to fill among the cable structure, can be fine fire-retardant and dispel the heat when the cable is heated. The cable structure is wrapped with a fireproof ceramic silicon rubber belt and extruded ceramic polyolefin for multiple times, and a ceramic honeycomb hard shell is formed by ceramic materials when the ceramic materials are burnt by high-temperature flame, so that the cable structure has the functions of heat dissipation and heat insulation. The high flame-retardant oxygen-isolating material is extruded on the inner layer of the ceramic polyolefin, so that the heat transfer of the insulating ceramic material to the insulating wire core is enhanced, and the insulating layer is prevented from being melted. The structure enables the cable to have excellent fire resistance. The self-adhesive aluminum-plastic composite tape is longitudinally wrapped in front of the oxygen isolation layer and is in a structure with the oxygen isolation layer, so that the cable has waterproof property. The sheath is made of halogen-free low-smoke material, and meets the environment-friendly requirement of halogen-free low smoke.

Drawings

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

Reference numerals: 1. an insulated wire core; 11. a conductor; 2. a shielding layer; 3. a layer of glass fiber strands; 4. a first fire resistant layer; 5. a waterproof layer; 6. a second fire-resistant layer; 7. a third fire prevention layer; 8. a reinforcing layer; 9. an outer sheath.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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 to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" 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," "disposed," "connected," and the like are to be construed broadly, and for example, "connected" may be either fixedly connected or 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.

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 work belong to the protection scope of the present invention.

Example 1

As shown in fig. 1, the fire-resistant waterproof medium-voltage crosslinked polyethylene insulated environment-friendly power cable of the embodiment includes a conductor shield, an insulated wire core 1 formed by co-extruding crosslinked polyethylene and an insulated shielding three layer outside a conductor 11, a copper strip wrapped outside the insulated wire core 1 as a shielding layer 2, three insulated wire cores 1 with the shielding layer 2 are twisted into a cable core, a glass fiber rope layer 3 is filled in the cable core, a ceramic silicone rubber strip wrapped outside the cable core is used as a first fireproof layer 4, a self-adhesive aluminum plastic strip longitudinally wrapped outside the first fireproof layer 4 is used as a waterproof layer 5, a high-fire-retardant oxygen-isolating material wrapped outside the waterproof layer 5 is used as a second fireproof layer 6, a ceramic polyolefin material wrapped outside the second fireproof layer 6 is used as a third fireproof layer 7, a ceramic silicone rubber strip wrapped outside the third fireproof layer 7 is used as a reinforcing layer 8, and a low-smoke halogen-free material wrapped outside the reinforcing layer 8 is used as an outer sheath 9.

The roundness of the cable core at least reaches 98 percent.

The conductor 11 is made of a tin-plated copper core material.

The wrapping directions of the first fireproof layer 4 and the reinforcing layer 8 are opposite.

The extrusion thickness of the third fire-proof layer 7 is 3.0mm-4.0 mm.

Adopt the glass fine rope to fill in the cable structure, fire-retardant and the heat dissipation when the cable is heated that can be fine. The cable structure is wrapped with a fireproof ceramic silicon rubber belt and extruded ceramic polyolefin for multiple times, and a ceramic honeycomb hard shell is formed by ceramic materials when the ceramic materials are burnt by high-temperature flame, so that the cable structure has the functions of heat dissipation and heat insulation. The high flame-retardant oxygen-isolating material is extruded on the inner layer of the ceramic polyolefin, so that the heat transfer of the insulating ceramic material to the insulating wire core is enhanced, and the insulating layer is prevented from being melted. The structure enables the cable to have excellent fire resistance. The self-adhesive aluminum-plastic composite tape is longitudinally wrapped in front of the oxygen isolation layer and is in a structure with the oxygen isolation layer, so that the cable has waterproof property. The sheath is made of halogen-free low-smoke material, and meets the environment-friendly requirement of halogen-free low smoke.

The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides an insulating environmental protection power cable of fire-resistant waterproof type middling pressure crosslinked polyethylene, includes that conductor shield, crosslinked polyethylene and insulation shield three-layer are crowded insulating core (1) of forming outside conductor (11), its characterized in that altogether: insulating sinle silk (1) is outer around the package have the copper strips as shielding layer (2), three have shielding layer (2) insulating sinle silk (1) strand is for the cable core, it has glass fiber rope layer (3) to fill in the cable core, the cable core is outer around package pottery silicone rubber area as first flame retardant coating (4), indulge outward in package autohension plastic-aluminum area as waterproof layer (5) first flame retardant coating (4), waterproof layer (5) are outer crowded package high fire-retardant oxygen barrier material as second flame retardant coating (6), second flame retardant coating (6) are outer crowded package pottery polyolefin material as third flame retardant coating (7), third flame retardant coating (7) are outer around package pottery silicone rubber area as enhancement layer (8), non-halogen free package low smoke material is as oversheath (9) outside enhancement layer (8).

2. The fire-resistant and waterproof medium-pressure crosslinked polyethylene insulated environment-friendly power cable according to claim 1, characterized in that: the roundness of the cable core at least reaches 98 percent.

3. The fire-resistant waterproof medium-voltage crosslinked polyethylene insulated environment-friendly power cable according to claim 2, characterized in that: the conductor (11) adopts a tin-plated copper core material.

4. The fire-resistant and waterproof medium-pressure crosslinked polyethylene insulated environment-friendly power cable according to claim 3, characterized in that: the first fireproof layer (4) and the reinforcing layer (8) are opposite in wrapping direction.

5. The fire-resistant and waterproof medium-pressure crosslinked polyethylene insulated environment-friendly power cable according to claim 4, characterized in that: the extrusion thickness of the third fire prevention layer (7) is 3.0mm-4.0 mm.