CN220651682U - Multilayer bonding insulated cable - Google Patents

Abstract

The utility model discloses a multilayer bonding insulated cable, which comprises a plurality of wire cores and a sheath for wrapping the wire cores, wherein the structure of the wire cores is sequentially provided with conductors and insulating layers from inside to outside, and the insulating layers are provided with multiple layers; the sheath structure comprises three layers of wrapping tape layers, two layers of shielding layers, two layers of protection layers and an armor layer. The utility model has reasonable structural design and has the following beneficial effects: the temperature resistance grade of the cable reaches 105 ℃, the flame retardant grade meets the requirements of national standard flame retardant A class, the cable is more environment-friendly, meanwhile, the flame is furthest retarded and delayed to spread and extend along the cable, the extension of the fire range of the cable is furthest reduced, and all plastics in the cable structure adopt halogen-free low-smoke raw materials without halogen, so that the cable is more environment-friendly.

Description

Multilayer bonding insulated cable

Technical Field

The utility model relates to the technical field of cables, in particular to a multilayer adhesive insulated cable.

Background

The power cable is a cable for transmitting and distributing electric energy, and is commonly used for urban underground power grids, power station outgoing lines, power supply in industrial and mining enterprises and power transmission lines under sea water passing through the river. In the electric power line, the proportion of the cable is gradually increasing. Power cables are cable products used in the main line of power systems to transmit and distribute high power electrical energy, including various voltage classes of 1-500KV and above, and various insulated power cables.

The number of fires caused by electrical causes in national fires is statistically about 30% of the total number, wherein fires caused by aging of wires account for more than half of the total electrical fires. Along with the increasing demands of people on living standard, the safety and environmental protection, especially the safety and environmental protection in buildings are more and more emphasized, and the demands of high flame retardance and environmental protection of building cables and the research on the building cables are forming a new hot trend. It is known that in the past, PVC has been used in most conventional wire and cable applications, whether insulation or sheathing, and that such halogen-containing materials have been used to form cables that produce toxic gases during the combustion process and do not self-extinguish, thereby compromising health or even life.

Then, in order to change the current situation that the cable is easy to burn, flame retardants such as chlorinated paraffin, antimony trioxide, magnesium hydroxide and the like are added into the plastic to improve the flame retardant property. However, halogen cannot meet the higher demand of people on flame retardance of cables and is harmful to health, so that low-smoke halogen-free materials and low-smoke halogen-free wires and cables step into the stage of the cable industry.

Disclosure of Invention

The utility model aims to provide an insulated and environment-friendly cable with a flame retardant grade reaching national standard flame retardant class A.

In order to achieve the above purpose, the technical scheme of the utility model provides a multi-layer adhesive insulated cable, which comprises a plurality of wire cores and a sheath for wrapping the wire cores, wherein the structure of the wire cores is sequentially provided with conductors and insulating layers from inside to outside, and the insulating layers are multi-layer; the sheath structure comprises three layers of wrapping tape layers, two layers of shielding layers, two layers of protection layers and an armor layer.

Further, the sheath is provided with a first belting layer, an inner shielding layer, a second belting layer, an outer shielding layer, an inner protection layer, an armor layer, a third belting layer and an outer protection layer from inside to outside in sequence.

Further, the insulating layer is three layers, and the conductor, the inner insulating layer, the middle insulating layer and the outer insulating layer are sequentially arranged in the structure of the wire core from inside to outside.

Further, the conductor is an oxygen-free copper conductor.

Further, the inner insulating layer, the middle insulating layer and the outer insulating layer are 105 ℃ halogen-free low-smoke flame-retardant silane crosslinked polyolefin insulating layers.

Further, the first strap layer and the second strap layer are polyester strap layers, and the third strap layer is a flame-retardant strap layer.

Further, the inner shielding layer is a copper strip shielding layer, and the outer shielding layer is a copper wire braided shielding layer.

Further, the inner protective layer and the outer protective layer are halogen-free low-smoke high-flame-retardance thermoplastic polyolefin protective layers.

Further, the armor is a galvanized steel wire armor.

In summary, the device provided by the utility model has reasonable structural design, and has the following beneficial effects by applying the technical scheme of the utility model: the utility model is provided with the multi-layer insulating layer, the three-layer wrapping tape layer, the two shielding layers, the two protective layers and the armor layer, the multi-layer insulating layer improves the insulativity of the cable, and the two shielding layers more effectively prevent the influence of external electromagnetic wave interference on signals; the temperature resistance grade of the cable reaches 105 ℃, the flame retardant grade meets the requirements of national standard flame retardant A class, the cable is more environment-friendly, meanwhile, the flame can be furthest retarded and delayed to spread and extend along the cable, the extension of the fire range of the cable is furthest reduced, and all plastics in the cable structure adopt halogen-free low-smoke raw materials without halogen, so that the cable is more environment-friendly.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

reference numerals illustrate: 1-conductors; 2-an inner insulating layer; 3-a middle insulating layer; 4-an outer insulating layer; 5-a first tape layer; 6-an inner shielding layer; 7-a second tape layer; 8-an outer shielding layer; 9-an inner protective layer; 10-armor layer; 11-a third tape layer; 12-an outer protective layer.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, but the scope of protection of the present utility model is not limited.

In the present utility model, for a clearer description, the following description is made: the observer views fig. 1 with the front left side of the observer set to the front, the rear right side of the observer set to the rear, the rear left side of the observer set to the left, the front right side of the observer set to the right, the upper side of the observer set to the upper side, and the lower side of the observer set to the lower side, and it should be noted that the terms "front end", "rear end", "left side", "right side", "middle", "upper", "lower", etc. in this text indicate orientations or positional relationships based on the orientations or positional relationships set in the drawings, and are merely for convenience of clearly describing the present utility model, but do not indicate or imply that the structures or components to be referred to must have specific orientations, be constructed in specific orientations, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," "fourth" and the like are used for clarity or to simplify the description, and are not to be construed as indicating or implying a relative importance or quantity.

Referring to fig. 1, the utility model provides a multi-layer adhesive insulated cable, which comprises a plurality of wire cores and a sheath for wrapping the wire cores, wherein the wire cores are sequentially provided with conductors 1 and insulating layers from inside to outside, and the insulating layers are multi-layer; the sheath is provided with a first belting layer 5, an inner shielding layer 6, a second belting layer 7, an outer shielding layer 8, an inner protection layer 9, an armor layer 10, a third belting layer 11 and an outer protection layer 12 from inside to outside in sequence.

As a preferred embodiment of the utility model, the insulating layer is three layers, and the conductor 1, the inner insulating layer 2, the middle insulating layer 3 and the outer insulating layer 4 are sequentially arranged on the wire core from inside to outside.

The common cable insulation adopts polyvinyl chloride (PVC) or crosslinked polyethylene (XLPE) for one-layer extrusion, the cable insulation adopts three layers of insulation of an inner insulation layer 2, a middle insulation layer 3 and an outer insulation layer 4, and adopts a three-layer co-extrusion system, so that the three extruders co-extrude the cable to meet the requirement of glue output, thereby realizing high-speed and stable production, and the three layers of materials have consistent quality, are extruded at high pressure, are tightly combined into a whole, are quick in color change, reduce material waste and respond to the environmental protection requirement of national low carbon emission reduction.

Specifically, the conductor 1 is an oxygen-free copper conductor 1, and the inner insulating layer 2, the middle insulating layer 3 and the outer insulating layer 4 are 105 ℃ halogen-free low-smoke flame-retardant silane crosslinked polyolefin insulating layers.

The common cable insulating material adopts polyvinyl chloride (PVC) or crosslinked polyethylene (XLPE), the cable temperature resistance grade only reaches 70 degrees or 90 degrees, and the cable insulating layer adopts 105 ℃ halogen-free low-smoke flame-retardant silane crosslinked polyolefin insulating material, so that the cable temperature resistance grade reaches 105 ℃.

Specifically, the first tape layer 5 and the second tape layer 7 are polyester tape layers, and the third tape layer 11 is a flame retardant tape layer.

Specifically, the inner shielding layer 6 is a copper strip shielding layer, and the outer shielding layer 8 is a copper wire braided shielding layer.

The common cable has no shielding layer or only one shielding layer, the cable has poorer shielding performance, poorer anti-interference performance and unstable signal transmission. The cable provided by the utility model adopts the copper strip and copper wire braided double-layer shielding, and has the characteristics of better shielding performance, stronger anti-interference capability, more stable, reliable and stable signal transmission and the like. The scheme adopts high-quality high-purity copper strips, and the outer layer covers the copper wire braided shielding layer, so that the influence of external electromagnetic wave interference on signals is prevented more effectively.

Specifically, the inner protective layer 9 and the outer protective layer 12 are halogen-free low-smoke high-flame-retardance thermoplastic polyolefin protective layers.

Specifically, the armor 10 is a galvanized steel wire armor 10. The galvanized steel wire armor layer 10 is adopted in the cable, so that the integrity and the electrical performance of the cable structure can be effectively protected, and the service life of the cable is prolonged. The steel wire armor layer 10 is used for protecting the cable from being damaged and injured by external mechanical force, mice and termites can be prevented from being bitten, the problem of power transmission caused by penetration of the armor layer 10 is avoided, meanwhile, the bending radius of the armor layer 10 is large, and the cable can be grounded, so that the cable is protected.

In summary, with the progress of the age, building cables will be gradually developed in the field of high flame retardance so as to adapt to the higher and higher demands of people. The utility model adopts a unique cable structure and cable material design, so that the temperature resistance level of the cable reaches 105 ℃, the flame retardant level meets the requirements of national standard flame retardant A class, the cable is more environment-friendly, meanwhile, the flame can be furthest retarded and delayed to spread and extend along the cable, the extension of the fire range of the cable is furthest reduced, all plastics in the cable structure adopt halogen-free low-smoke raw materials without halogen, the cable is more environment-friendly, and the life safety and property loss of people are more protected when the fire occurs.

While the foregoing is directed to the preferred embodiments of the present utility model, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the utility model, such changes and modifications are also intended to be within the scope of the utility model.

Claims (9)

1. A multilayer bonded insulated cable comprising a plurality of cores and a jacket for wrapping the cores, characterized in that: the structure of the wire core is sequentially provided with a conductor and an insulating layer from inside to outside, and the insulating layer is provided with a plurality of layers; the sheath structure comprises three layers of wrapping tape layers, two layers of shielding layers, two layers of protection layers and an armor layer.

2. The multi-layer bonded insulated cable of claim 1, wherein: the sheath is provided with a first belting layer, an inner shielding layer, a second belting layer, an outer shielding layer, an inner protection layer, an armor layer, a third belting layer and an outer protection layer from inside to outside in sequence.

3. A multi-layer bonded insulated cable according to claim 2, wherein: the insulation layer is three layers, and the conductor, the inner insulation layer, the middle insulation layer and the outer insulation layer are sequentially arranged on the structure of the wire core from inside to outside.

4. A multi-layer bonded insulated cable according to claim 3, wherein: the conductor is an oxygen-free copper conductor.

5. The multi-layer bonded insulated cable of claim 4, wherein: the inner insulating layer, the middle insulating layer and the outer insulating layer are 105 ℃ halogen-free low-smoke flame-retardant silane crosslinked polyolefin insulating layers.

6. The multi-layer bonded insulated cable of claim 4, wherein: the first strap layer and the second strap layer are polyester strap layers, and the third strap layer is a flame-retardant strap layer.

7. The multi-layer bonded insulated cable of claim 4, wherein: the inner shielding layer is a copper strip shielding layer, and the outer shielding layer is a copper wire braided shielding layer.

8. The multi-layer bonded insulated cable of claim 4, wherein: the inner protective layer and the outer protective layer are halogen-free low-smoke high-flame-retardance thermoplastic polyolefin protective layers.

9. The multi-layer bonded insulated cable of claim 4, wherein: the armor is a galvanized steel wire armor.