CN112885509A

CN112885509A - Cold-resistant power line

Info

Publication number: CN112885509A
Application number: CN202110275985.9A
Authority: CN
Inventors: 陈杰
Original assignee: Guangzhou Yuedao Industrial Co ltd
Current assignee: Guangzhou Yuedao Industrial Co ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2021-06-01

Abstract

The invention provides a cold-resistant power line which comprises an outer layer sheath and a plurality of insulated wires, wherein the outer layer sheath is coated outside the insulated wires, each insulated wire comprises a conductive wire core and a fire-resistant layer coated outside the conductive wire core, a cold-resistant insulating material is used, the fire-resistant layer comprises a fire-resistant inner layer and a fire-resistant outer layer, a heat-conducting insulating piece is arranged in the fire-resistant layer, a first end of the heat-conducting insulating piece penetrates through the fire-resistant inner layer so as to extend to the conductive wire core, and a second end of the heat-conducting insulating piece penetrates through the fire-. The fire-resistant inner layer and the fire-resistant outer layer can play a flame-retardant role in the heat-conducting insulating part when a fire occurs, so that the power line has a fire-resistant characteristic. When the insulated wire is electrified, heat emitted by the conductive wire core can be transferred to the outer sheath through the heat-conducting insulating piece, so that the outer sheath is not hard and brittle due to cold, and the power line is not easy to break even if being moved and bent in a cold environment. The product uses special insulating and sheathing materials.

Description

Cold-resistant power line

Technical Field

The invention relates to the technical field of cables, in particular to a cold-resistant power line.

Background

The power cord is a cable used to build up an electrical power supply network. The power cord mainly includes insulated wire and outer sheath, and outer sheath cladding plays the effect of protection insulated wire outside the insulated wire. A mica tape wrapping layer is usually arranged between the insulated wire and the outer sheath, and the mica tape wrapping layer enables the power line to have fire-resistant characteristics. However, the fire-resistant mica tape wrapping layer also has a heat insulation characteristic, so the mica tape wrapping layer can not transfer heat between the insulated conducting wire and the outer sheath of the power line, and the heat generated when the insulated conducting wire is electrified can not be transferred to the outer sheath, so that the outer sheath of the power line laid in a cold area is easy to be hardened and embrittled due to cold in a cold environment, so that the power line is easy to break when being moved and bent by workers, and the normal supply of electric power is influenced.

Disclosure of Invention

The invention aims to provide a power cord with fire-resistant characteristics, which is not easy to break even if moved and bent under a cold environment.

In order to solve the technical problem, the invention provides a cold-resistant power line which comprises an outer layer sheath and a plurality of insulated wires, wherein the outer layer sheath is covered outside the insulated wires, each insulated wire comprises a conductive wire core and a fire-resistant layer covered outside the conductive wire core, the fire-resistant layer comprises a fire-resistant inner layer and a fire-resistant outer layer, a heat-conducting insulating piece is arranged in the fire-resistant layer, a first end of the heat-conducting insulating piece penetrates through the fire-resistant inner layer so as to extend to the conductive wire core, and a second end of the heat-conducting insulating piece penetrates through the fire-resistant outer.

Preferably, in each insulated conductor, a shielding layer is arranged between the conductive wire core and the fireproof inner layer, an insulating layer is arranged between the fireproof outer layer and the outer layer sheath, the first end of the heat conduction insulating part penetrates through the fireproof inner layer to contact the shielding layer, and the second end penetrates through the fireproof outer layer and the insulating layer to contact the outer layer sheath.

Preferably, the shielding layer is a metal mesh braid.

Preferably, the material of the metal mesh braid is tin-plated copper.

Preferably, the material of the insulating layer is polytetrafluoroethylene.

Preferably, the material of the outer sheath is polytetrafluoroethylene.

Preferably, the conductive wire core comprises a plurality of oxygen-free copper wires stranded with each other.

Preferably, the fire-resistant layer is a double-layer mica tape lapping layer, and the fire-resistant inner layer and the fire-resistant outer layer are two layers of mica tapes of the double-layer mica tape lapping layer respectively.

Preferably, the heat-conducting insulating member is a heat-conducting silicone sheet.

Preferably, there are a plurality of the thermally conductive insulating members on each insulated conductor, and the plurality of thermally conductive insulating members are arranged axially along the insulated conductor.

The invention has the following beneficial effects: because the heat conduction insulating part is established in the flame retardant coating, so fire-resistant inlayer and fire-resistant outer can play fire-retardant effect to the heat conduction insulating part when taking place the condition of a fire for the power cord possesses fire-resistant characteristic. Because the first end of the heat-conducting insulating part runs through the fireproof inner layer and extends to the conductive wire core, and the second end runs through the fireproof outer layer and extends to the outer layer sheath, when the insulated wire is electrified, heat emitted by the conductive wire core can be transferred to the outer layer sheath through the heat-conducting insulating part, so that the outer layer sheath cannot become hard and brittle due to cold, and the power line cannot be easily broken even if being moved and bent in a cold environment.

Drawings

Fig. 1 is a radial cross-sectional view of a cold-resistant power cord.

Description of reference numerals: 1-outer sheath; 2-an insulated wire; 21-a conductive core; 22-a shielding layer; 23-a refractory layer; 231-a refractory inner layer; 232-a refractory outer layer; 24-an insulating layer; 25-thermally conductive insulation.

Detailed Description

The invention is described in further detail below with reference to specific embodiments.

As shown in fig. 1, the cold-resistant power cord comprises an outer sheath 1 and three insulated wires 2, wherein the outer sheath 1 is covered outside the three insulated wires 2. Each insulated wire 2 comprises a conductive wire core 21, a shielding layer 22, a fire-resistant layer 23, an insulating layer 24 and a heat-conducting insulating part 25, the conductive wire core 21 comprises seven mutually-twisted anaerobic copper wires, and the shielding layer 22, the fire-resistant layer 23 and the insulating layer 24 are sequentially wrapped outside the conductive wire core 21 from inside to outside.

The outer sheath 1 and the insulating layer 24 are made of Polytetrafluoroethylene (PTFE) which has the characteristics of heat resistance, cold resistance, acid resistance, alkali resistance and various organic solvents resistance, so that the insulated wire 2 can be protected.

The shielding layer 22 is a metal mesh braid made of tin-plated copper. When the insulated conducting wire 2 of the power line is electrified, the current passing through the conductive wire core 21 is larger, so that an electromagnetic field can be generated around the conductive wire core 21, and the metal mesh braid can shield the electromagnetic field generated when the insulated conducting wire 2 is electrified in the insulated conducting wire 2, thereby reducing the mutual influence among the insulated conducting wires 2.

The flame retardant coating 23 is a double-layer mica tape wrapping layer, which comprises two layers of mica tapes, wherein the two layers of mica tapes are a flame-retardant inner layer 231 and a flame-retardant outer layer 232 respectively, the shielding layer 22 is positioned between the conductive wire core 21 and the flame-retardant inner layer 231, and the insulating layer 24 is positioned between the flame-retardant outer layer 232 and the outer sheath 1.

The heat conductive insulator 25 is a heat conductive silicone sheet, which is provided between the fire resistant inner layer 231 and the fire resistant outer layer 232 of the fire resistant layer 23, and the heat conductive insulator 25 has a first end penetrating the fire resistant inner layer 231 to contact the shielding layer 22 and a second end penetrating the fire resistant outer layer 232 and the insulating layer 24 to contact the outer sheath 1. Because the heat-conducting insulating member 25 is arranged between the fire-resistant inner layer 231 and the fire-resistant outer layer 232, the fire-resistant inner layer 231 and the fire-resistant outer layer 232 can play a flame-retardant role in the heat-conducting insulating member 25 in case of fire, so that the power line has fire-resistant characteristics. Since the shielding layer 22 is a metal mesh braid, the heat generated by the conductive wire core 21 when the conductive wire core 21 is energized is transferred to the shielding layer 22, and the heat-conducting insulator 25 contacting the shielding layer 22 is equivalent to extending to the conductive wire core 21, so that when the insulated wire 2 is energized, the heat generated by the conductive wire core 21 is transferred to the heat-conducting insulator 25 through the shielding layer 22 and then transferred to the outer sheath 1 through the heat-conducting insulator 25, so that the outer sheath 1 is not hard and brittle due to cold even in an extremely cold environment (e.g., -100 ℃), and the power line is not easily broken even if being moved and bent in the extremely cold environment.

In this embodiment, there are a plurality of heat conducting and insulating members 25 on each insulated conducting wire 2, and the plurality of heat conducting and insulating members 25 are arranged along the insulated conducting wire 2 axially, so that when the insulated conducting wire 2 is powered on, the heat emitted by the heat conducting wire core 21 can be uniformly transferred to each position of the outer sheath 1 through each heat conducting and insulating member 25, so that the outer sheath 1 is not hardened and embrittled by cold.

The above description is only the embodiments of the present invention, and the scope of protection is not limited thereto. The insubstantial changes or substitutions will now be made by those skilled in the art based on the teachings of the present invention, which fall within the scope of the claims.

Claims

1. Cold-resistant power cord, including outer sheath (1) and many insulated wire (2), outer sheath (1) cladding is outside many insulated wire (2), and every insulated wire (2) are including electrically conductive sinle silk (21) and cladding flame retardant coating (23) outside electrically conductive sinle silk (21), characterized by, flame retardant coating (23) are equipped with heat conduction insulating part (25) including fire-resistant inlayer (231) and fire-resistant outer layer (232) in flame retardant coating (23), thereby heat conduction insulating part (25) first end runs through fire-resistant inlayer (231) and extends to electrically conductive sinle silk (21), thereby the second end runs through fire-resistant outer layer (232) and contacts outer sheath (1).

2. The cold-resistant power cord as claimed in claim 1, wherein in each insulated conductor (2), a shielding layer (22) is arranged between the conductive core (21) and the fire-resistant inner layer (231), an insulating layer (24) is arranged between the fire-resistant outer layer (232) and the outer sheath (1), the heat-conducting insulating member (25) has a first end penetrating through the fire-resistant inner layer (231) to contact the shielding layer (22), and a second end penetrating through the fire-resistant outer layer (232) and the insulating layer (24) to contact the outer sheath (1).

3. The cold-resistant power cord as claimed in claim 2, wherein the shielding layer (22) is a metal mesh braid.

4. The cold-resistant power cord as claimed in claim 3, wherein the metallic mesh braid is made of tin-plated copper.

5. The cold-resistant power cord as claimed in claim 2, wherein the insulating layer (24) is made of polytetrafluoroethylene.

6. The cold-resistant power cord as claimed in claim 1, wherein the outer sheath (1) is made of polytetrafluoroethylene.

7. The cold-resistant power cord as claimed in claim 1, wherein the conductive core (21) comprises a plurality of oxygen-free copper wires twisted with each other.

8. The cold-resistant power cord as claimed in claim 1, wherein the fire-resistant layer (23) is a double-layer mica tape wrapping layer, and the fire-resistant inner layer (231) and the fire-resistant outer layer (232) are two layers of mica tapes of the double-layer mica tape wrapping layer respectively.

9. The cold-resistant power cord as claimed in claim 1, wherein the heat-conductive insulating member (25) is a heat-conductive silicone sheet.

10. The cold-resistant power cord as claimed in claim 1, wherein there are a plurality of heat conductive and insulating members (25) on each insulated conductor (2), and the plurality of heat conductive and insulating members (25) are arranged along the axial direction of the insulated conductor (2).