CN215451006U

CN215451006U - High flame retardant polyethylene sheath power cable

Info

Publication number: CN215451006U
Application number: CN202121057581.4U
Authority: CN
Inventors: 韩红明; 徐思远
Original assignee: Gold Cup Electric Hengyang Cable Co Ltd
Current assignee: Gold Cup Electric Hengyang Cable Co Ltd
Priority date: 2021-05-18
Filing date: 2021-05-18
Publication date: 2022-01-07
Anticipated expiration: 2031-05-18

Abstract

The utility model discloses a high-flame-retardance polyethylene sheath power cable which is characterized by comprising a core wire stranded body, a ceramic silicon rubber belt layer wound on the core wire stranded body, a low-smoke halogen-free oxygen-isolating layer extruded on the ceramic silicon rubber belt layer, a double-steel-belt armor layer wound on the low-smoke halogen-free oxygen-isolating layer and a flame-retardance polyethylene sheath extruded on the double-steel-belt armor layer; the core wire stranded body is formed by stranding a plurality of core wires and a flame-retardant filling rope. The high flame-retardant polyethylene sheath power cable disclosed by the utility model is good in flame-retardant property, safe and reliable, and can be better used in occasions with flame-retardant requirements. Through the structural design of the comprehensive product, the flame-retardant polyethylene sheathed cable passes the requirements of an A-level bundling test.

Description

High flame retardant polyethylene sheath power cable

Technical Field

The utility model relates to the technical field of cables, in particular to a high-flame-retardant polyethylene sheath power cable.

Background

The polyethylene sheath in the polyethylene sheath power cable has excellent low temperature resistance, easy processing and forming and excellent chemical stability, so the polyethylene sheath is widely applied to the field of electric wires and cables. Along with the improvement of the requirements of people on the performance of plastic products, the requirements of flame-retardant electric wires and cables are increasingly vigorous, and particularly in the petroleum and chemical industries, the cables are required to have better flame-retardant performance.

At present, sheath materials in a sheath power cable with better flame retardant property mainly comprise polyvinyl chloride and low-smoke halogen-free flame retardant, the polyvinyl chloride is mainly halogen-containing flame retardant, and a large amount of dense smoke and corrosive halide are released when the cable is burnt, so that casualties are caused. The low-smoke halogen-free sheath material has good flame retardant property and releases less toxic gas, but the low-smoke halogen-free sheath material has the problems of poor mechanical property, easy cracking in bending and the like due to the addition of a large amount of flame retardant.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the present invention is to provide a high flame retardant polyethylene sheathed power cable, aiming at the above disadvantages of the sheath material in the existing sheathed power cable, the flame retardant polyethylene sheathed material used in the high flame retardant polyethylene sheathed power cable not only has high strength and elongation and good wear resistance, but also has good flame retardant property through the structural design, thus gaining favor of the petrochemical industry.

The technical problem to be solved by the utility model can be realized by the following technical scheme:

a high flame-retardant polyethylene sheath power cable comprises a core wire stranded body, a ceramic silicon rubber tape layer wound on the core wire stranded body, a low-smoke halogen-free oxygen-insulating layer extruded on the ceramic silicon rubber tape layer, a double-steel-tape armor layer wound on the low-smoke halogen-free oxygen-insulating layer and a flame-retardant polyethylene sheath extruded on the double-steel-tape armor layer; the core wire stranded body is formed by stranding a plurality of core wires and a flame-retardant filling rope.

In a preferred embodiment of the utility model, the oxygen index of the low-smoke halogen-free oxygen insulation material in the low-smoke halogen-free oxygen insulation material layer is not less than 45, and the oxygen index of the flame-retardant polyethylene adopted by the flame-retardant polyethylene sheath is not less than 32.

In a preferred embodiment of the utility model, the thickness of the flame-retardant polyethylene sheath is 2.0-2.5 mm.

In a preferred embodiment of the utility model, each core wire is composed of a conductor and a crosslinked polyethylene insulation layer extruded on the conductor.

Due to the adoption of the technical scheme, compared with the existing sheath power cable, the sheath power cable has the following characteristics:

1. firstly, the low-smoke halogen-free oxygen-insulating layer is extruded, the oxygen index reaches more than 45, and the flame-insulating effect is better; the flame-retardant polyethylene sheath wrapped outside the outer sheath has an oxygen index of over 32, the sheath has certain temperature resistance, and the sheath does not drip or fall off during combustion and has a crusting effect.

2. The cable core is filled and the belting adopts pottery silicone rubber area and fire-retardant packing rope, and pottery silicone rubber area forms ceramic casing after meetting high temperature, effectively prevents high temperature to think the inside conduction of cable core, avoids the flammable phenomenon that combustible insulation material and air contact arouse in the cable core, effectively reduces thermal release.

3. The inner liner layer adopts an extruded low-smoke halogen-free oxygen-insulating layer, the oxygen index reaches more than 45, the material releases crystal water and forms a hard shell which is not melted and non-combustible when the cable burns due to the addition of a large amount of hydroxide, the charking performance is good after the cable burns, the flame is effectively isolated, and the internal insulation is well protected.

4. The outer sheath is made of a flame-retardant polyethylene material with an oxygen index of 32, and the overall extrusion thickness of the sheath is ensured to be 2.0-2.5mm by a double-layer co-extrusion technology, so that the sheath is suitable for crusting and not falling off during combustion, and flame spread and penetration can be effectively delayed.

The high flame-retardant polyethylene sheath power cable disclosed by the utility model is good in flame-retardant property, safe and reliable, and can be better used in occasions with flame-retardant requirements. Through the structural design of the comprehensive product, the flame-retardant polyethylene sheathed cable passes the requirements of an A-level bundling test.

Drawings

Fig. 1 is a schematic cross-sectional view of a power cable with a high flame retardant polyethylene sheath according to the present invention.

Detailed Description

The utility model is further described below in conjunction with the appended drawings and detailed description.

Referring to fig. 1, the high flame retardant polyethylene sheath power cable shown in the figure comprises a core wire stranded body, a ceramic silicon rubber tape layer 4 wound on the core wire stranded body, a low smoke zero halogen oxygen-insulating layer 5 extruded on the ceramic silicon rubber tape layer 4, a double steel strip armor layer 6 wound on the low smoke zero halogen oxygen-insulating layer 5, and a flame retardant polyethylene sheath 7 extruded on the double steel strip armor layer 6.

The core wire stranded body is formed by stranding a plurality of core wires (4 core wires in the embodiment) and the flame-retardant filling rope 2.

Each core wire is composed of a conductor 1 and a crosslinked polyethylene insulation layer 5 extruded on the conductor 1. The cable core is filled and the belting adopts pottery silicone rubber area and fire-retardant packing rope, and pottery silicone rubber area forms ceramic casing after meetting high temperature, effectively prevents high temperature to think the inside conduction of cable core, avoids the flammable phenomenon that combustible insulation material and air contact arouse in the cable core, effectively reduces thermal release.

The oxygen index of the low-smoke halogen-free oxygen insulation material in the low-smoke halogen-free oxygen insulation material layer 5 is not less than 45, due to the addition of a large amount of hydroxide, crystal water is released during cable combustion, a non-melting and non-combustible hard shell is formed, charing performance after combustion is good, flame is effectively isolated, a good fire insulation effect is achieved, and internal insulation is well protected.

The flame-retardant polyethylene oxygen index adopted by the flame-retardant polyethylene sheath is not less than 32, and the overall extrusion thickness of the sheath is ensured to be 2.0-2.5mm by a double-layer co-extrusion technology, so that the sheath is not easy to drip and crust during combustion and is not easy to fall off, and the flame spread and permeation can be effectively delayed.

Claims

1. A high flame-retardant polyethylene sheath power cable is characterized by comprising a core wire stranded body, a ceramic silicon rubber belt layer wound on the core wire stranded body, a low-smoke halogen-free oxygen-insulating layer extruded on the ceramic silicon rubber belt layer, a double-steel-belt armor layer wound on the low-smoke halogen-free oxygen-insulating layer and a flame-retardant polyethylene sheath extruded on the double-steel-belt armor layer; the core wire stranded body is formed by stranding a plurality of core wires and a flame-retardant filling rope.

2. The power cable with the high flame-retardant polyethylene sheath according to claim 1, wherein the oxygen index of the low-smoke halogen-free oxygen-insulating material in the low-smoke halogen-free oxygen-insulating material layer is not less than 45, and the oxygen index of the flame-retardant polyethylene adopted by the flame-retardant polyethylene sheath is not less than 32.

3. The power cable with the high flame retardant polyethylene sheath as claimed in claim 2, wherein the thickness of the flame retardant polyethylene sheath is 2.0-2.5 mm.

4. A high flame retardant polyethylene sheathed power cable according to any one of claims 1 to 3, wherein each core wire is comprised of a conductor and a layer of cross-linked polyethylene insulation extruded over said conductor.