CN104332234A

CN104332234A - Two-core cable

Info

Publication number: CN104332234A
Application number: CN201410688452.3A
Authority: CN
Inventors: 刘军; 马壮; 韩俊杰; 鲍启伟; 李林森
Original assignee: Wuxi Jiangnan Cable Co Ltd
Current assignee: Wuxi Jiangnan Cable Co Ltd
Priority date: 2014-11-26
Filing date: 2014-11-26
Publication date: 2015-02-04

Abstract

The invention discloses a two-core cable. The two-core cable comprises a tying layer (1) and a cable core (2), wherein the tying layer (1) is arranged to cover the cable core (2); the cable core (2) is formed by stranding two wire cores (21). Each wire core (21) comprises a circular conductor (211) and an arched insulating sheath composite layer (212) which is extruded to cover the circular conductor (211). The two-core cable has the advantages that the wire cores are of an arched structure and compact in structure, the gap between the wire cores is small, flame retardant or fireproof materials such as a glass fiber rope, a glass fiber tape, a mica tape and an asbest rope are not needed so that the production cost can be reduced, and the flame retardant and fireproof properties are reliable. Besides, the conductors are of a circular compressed structure, and therefore, the process difficult is low and the insulating layers are not damaged.

Description

A kind of two core cable

Technical field

The invention belongs to technical field of electric wires and cables, particularly a kind of two core cable.

Background technology

Along with taking place frequently of fire incident, people constantly deepen electric wire fire risk understanding, and the requirement of relevant department to performances such as electric wire fire protection flame retardings is also more and more higher.Features such as spreading fast, difficulty of putting out a fire to save life and property because cable fire has, produce secondary harm, recovery time is long can bring huge loss to the lives and properties of national economy and the people.Therefore fire-retardant, fire performance, the security reliability of people to electric wire proposes harsher service conditions.As strong in fire prevention, explosion-proof, overload capacity, long service life, the particular/special requirements such as under Fire Conditions, Fire lift, fire pump need keep the normal operation in certain hour, and cable is low-smoke low-halogen low toxicity after combustion, and even smokeless halogen-free is nontoxic.Cable-flame retardant, fire prevention measure reduce the important means that ignition of cable prolongs combustion, and key is being relied mainly on prevention, and all kinds of flame retardant cable, fire-resisting cable, fireproof cable are used widely.

Burning occurs any material all must possess following three conditions: combustible, oxidant and temperature (ignition source).The oxygen contained in air is a kind of oxidant, therefore, in Cable Construction Design, reducing gap between cable is a kind of conventional method with the existence that this reduces air, therefore, prior art often adopts the method arranging the fire-retardant or refractory material such as glass cord, glass fiber tape, mica tape, asbestos cord between each structure of cable, can improve fire-retardant, the fire resistance of cable.This method one is that use that is fire-retardant or refractory material can increase production cost in a large number, and two is fire-retardant or the performance of refractory material own is unreliable or have Shanghai to human body.In order to reduce the gap between core, in prior art, two core cable also usually uses arc conductor, and extruded insulation forms stranding after arc core, and gap between core can be made to drop to minimum, but and gap between sheath still exist.There is an a lot of difficult problem and drawback in the processing of especially arc conductor: one is that technology difficulty is large in process of production, in order to meet the enough flexibilities of arc conductor and stability, all higher to the characteristic requirements of the design of conductor structure, moulds of industrial equipment, equipment; Two is want conductor to adopt compact conductor for preventing moisture from infiltrating, and to improve the activity coefficient of wire, reduced outside diameter, reduce gap between conductor, and arc conductor is arc pressing, the shape of every layer is different, and the difficulty of pressing increases; Three is easily cause electric field to concentrate in each angle course of processing of arc conductor and damage cable insulation.

summary of the invention

The present invention overcomes the shortcoming that prior art exists, and provides a kind of compact conformation, cost is low, technology difficulty is low, two core cable that flame-retardant performance is good.

Two core cable of the present invention, comprises and tightens layer and cable core, is outside equipped with tightens layer at cable core; Described cable core forms by two cores are stranded.

As the further improvement of technique scheme, described core comprises round conductor and arc insulating sleeve composite bed, and described arc insulating sleeve composite bed is extruded in outside round conductor.

Another kind as technique scheme improves, and described round conductor is round compacted comductor or presses circular molded line conductor.

Another kind as technique scheme improves, and described arc insulating sleeve composite bed is squash type or crowded tubular type.

Another kind as technique scheme improves, described in tighten layer and be wrapped, vertical bag, weave or extrude.

Another kind as technique scheme improves, described in tighten layer be braid, braid is coated with flame-retardant coating.

Two core cable of the present invention, core is bow-shaped structural, compact conformation, and between core, gap is little, does not need to use the fire-retardant or refractory materials such as glass cord, glass fiber tape, mica tape, asbestos cord, reduces production cost, flame-retardant dependable performance.Conductor adopts circle to press structure, and technology difficulty is little and can not Damage to insulation layer.

Accompanying drawing explanation

Fig. 1 is two core cable structural representation of the present invention.

Embodiment

Below in conjunction with accompanying drawing, a kind of two core cable that the present invention proposes is described in detail.

As shown in Figure 1, a kind of two core cable of the present embodiment comprises tightens layer 1 and cable core 2, is outside equipped with tightens layer 1 at cable core 2; Described cable core 2 forms by two cores 21 are stranded.

Described core 21 comprises round conductor 211 and arc insulating sleeve composite bed 212, and described arc insulating sleeve composite bed 212 is extruded in outside round conductor 211.Described round conductor 211 is for round compacted comductor or press circular molded line conductor.

Described arc insulating sleeve composite bed 212 is squash type or crowded tubular type.Preferred squash type.

Described layer 1 of tightening is wrapped, vertical bag, weaves or extrude.Be preferably braid, braid is coated with flame-retardant coating.

Claims

1. a two core cable, is characterized in that: comprise and tighten layer (1) and cable core (2), is outside equipped with tightens layer (1) at cable core (2); Described cable core (2) forms by two cores (21) are stranded.

2. two core cable according to claim 1, is characterized in that: described core (21) comprises round conductor (211) and arc insulating sleeve composite bed (212), and described arc insulating sleeve composite bed (212) is extruded in round conductor (211) outward.

3. two core cable according to claim 2, is characterized in that: described round conductor (211) is for round compacted comductor or press circular molded line conductor.

4. two core cable according to claim 2, is characterized in that: described arc insulating sleeve composite bed (212) is squash type or crowded tubular type.

5. two core cable according to claim 1, is characterized in that: described in tighten layer (1) and be wrapped, vertical bag, weave or extrude.

6. two core cable according to claim 5, is characterized in that: described in tighten layer (1) be braid, braid is coated with flame-retardant coating.