CN101393784B - Coaxial communication cable - Google Patents

Abstract

The invention relates to the field of communication, particularly to a woven coaxial communication cable. The woven coaxial communication cable includes an inner conductor, an insulating layer, an outer conductor and a sheath in sequence from inside to outside, wherein, the inner conductor extends along the longitudinal axis of the cable, the insulating layer is used for separating the inner conductor from the outer conductor, a shielding layer is arranged on the outer surface of the outer conductor, and the shielding layer is made of tinning copper-clad steel wires. The woven coaxial communication cable changes the material and the structure of the shielding layer of the prior woven coaxial communication cable. The tinning copper-clad steel wire is adopted to replace the tinning copper wire, as the specific gravity of the tinning copper-clad steel wire is small. The greatest advantage of adopting the tinning copper-clad steel wire is that the weight and the size are far smaller than those of the tinning copper wire under the condition of satisfying the shielding requirement, thereby greatly facilitating the transportation and the erection construction of the cable, and substantially reducing the size of the cable.

Description

Coaxial communication cable

Technical field

The present invention relates to communication field, relate in particular to a kind of Weaving type coaxial communication electric cable.

Background technology

The fast development of information industry can not break away from the basis of corresponding long distance communication and independent development.The TV programme quantity that increases clear picture and acoustical sound is the major impetus of the limited television system of development.In the information age of current develop rapidly, also be faced with unprecedented opportunity to develop and challenge as cable TV (CATV) net of one of national information infrastructure.For mainly being used in cable TV network branch line and subscribers feeder, a most advanced generation wired (CATV) cable---the performance and the material requirements of physically-foamed coaxial cable are also more and more higher.So far, China has only producer few in number can produce this product.Physically-foamed coaxial cable is general main to be made up of inner wire, insulating barrier, outer conductor and sheath four major parts.Internal and external conductor is placed on the same axis with one heart, middle uses low-loss insulating material to separate, and to guarantee the alignment of internal and external conductor, prevents that simultaneously it is in contact with one another and makes the signal attenuation of transmission.In order to guarantee under the constant situation of insulation property, improve mechanical performance (bending property), the shielding properties of cable and reduce cost, just need the material and the structure of cable be optimized.Metal knitted in the electronic cable industry, use very extensive.Requirement according to electric wire often weaves outside insulated wire cores or outer conductor.With wire and become strand with certain rules to interweave mutually and cover on the outer conductor of electric wire, become a protective layer closely.At present the screen of the coaxial cable that uses mostly is tinned copper wire, because the proportion of copper is bigger, it is relatively poor that its bending property and the aluminium of same diameter are compared with magnesium, and raw material---the price of copper skyrockets now simultaneously.

Summary of the invention

The Weaving type coaxial communication electric cable that the purpose of this invention is to provide a kind of good bending property.

For achieving the above object, provide following technical scheme:

Weaving type coaxial communication electric cable, it comprises an inner wire from inside to outside successively, it extends along the longitudinal axis of cable; Insulating barrier, outer conductor and sheath, this insulating barrier separates internal and external conductor, and the outer surface of outer conductor also is provided with screen, and wherein, the material of described screen is the tinning steel-in-copper silk.

Coaxial cable of the present invention has changed existing Weaving type cable shield material and structure, replace tinned copper wire with the tinning steel-in-copper silk, because the proportion of tinning steel-in-copper silk is little, the great advantage of using the tinning steel-in-copper silk is to satisfy weight and size under the situation of shielding requirements than little many of tinned copper wire, bring great convenience for like this transportation and the erection construction of cable, reduce cable dimension on the whole.Simultaneously, because the tinning steel-in-copper silk is than tinned copper wire softness, so coat the many of cable softness with the cable of tinning steel-in-copper silk coating than tinned copper wire, bending property is more excellent.Can save a large amount of copper materials with the tinning steel-in-copper silk as Weaving type cable outer conductor material.Because in the All Around The World scope, aluminum ore and iron ore are very abundant, and copper mine has relatively just lacked, particularly present China, because raw-material rise in price, the copper resource is very nervous.

Description of drawings

Fig. 1 is the sectional view of coaxial communication cable of the present invention.

Embodiment

Referring to Fig. 1, be the sectional view of coaxial communication cable of the present invention, it comprises inner wire 1 from inside to outside successively this radio frequency coaxial-cable, along the longitudinal axis extension of cable; Interior thin layer 2, insulating barrier 3, outer thin layer 4, outer conductor 5 and sheath 6.This insulating barrier 3 separates inner wire 1 and outer conductor 3.This outer conductor 5 is several layers structure (according to the decision of specific product specification), generally be to be base material, be coated on outside the insulating barrier 3, coat screen 7 then outside with aluminium strip or copper strips, adopt the material of tinning steel-in-copper silk, utilize existing weaving to produce as screen 7.For the combination property that realizes communication cable improves, the percentage by weight of copper is 4-6% in the screen 7, and the percentage by weight of tin is 4-6%, and the percentage by weight of steel is 88-92%.Best proportioning is: the percentage by weight of copper is 5%, and the percentage by weight of tin is 5%, and the percentage by weight of steel is 90%.Through evidence, another kind of proportioning, the percentage by weight of copper is 4%, and the percentage by weight of tin is 4%, and the percentage by weight of steel is 92%, also has better comprehensive performance.Another selectable optimal components ratio is, the percentage by weight of copper is 6%, and the percentage by weight of tin is 6%, and the percentage by weight of steel is 88%.The manufacturing process of tinning steel-in-copper silk is, at first according to the quality ratio requirement, coats copper product on the surface of steel wire, and is zinc-plated at the outer surface of copper again, just forms described tinning steel-in-copper silk.

The manufacturing process of screen is, at first is to determine and number of share of stock, then wire is carried out Split Down, sends into braiding machine at last and weaves.The key condition of Weaving type outer conductor manufacturing process is count and number of share of stock, single cord footpath and the pitch of screen.In the present invention, be to set under the constant situation of count, change the material and the single cord footpath of virgin metal screen.

Be the theoretical calculation formula (removing loss and gap) of count, material usage and physical dimension below

1 count P

P＝(2p-p ²)×100％　　　 $\mathrm{\α}=\mathrm{arctg}\frac{h}{\mathrm{\π}\·D_{\mathrm{cp}}}$ 　　　　　　　 $p=\frac{a\·n\·d}{h\·\cos \mathrm{\α}}$

2 physical dimensions (braiding back external diameter)

D＝D ₀+4d(mm)

In the formula: P---count; P---unidirectional count; Half of a---number of spindle unit; N---every ingot radical wiry; D---braiding diameter wiry; α---braiding angle;

D---braiding back external diameter; DCP=D ₀+ 2d; D ₀---the product diameter that is woven;

DCP---by the average diameter of assembling-disassembling; H---lay of braiding

Following table is the theoretic count of several prods, material usage and the physical dimension of calculating according to formula

In order to reach identical count,, adopt identical braiding machine production as can be seen from the table with a kind of product.Select for use metal knitted solid wire footpath different.The multi-thread footpath of number of share of stock little than number of share of stock lack line footpath big under the identical situation of unit length, material usage will reduce about 16.5～21%, braiding back construction of cable size will descend 0.9～2.4%, the size minimizing 16～20% directly of shielding layer line.Higher with its flexibility of tinning steel-in-copper silk, can effectively improve the bending radius of cable, make the combination property of cable, prolonged the useful life of cable.Through measuring, the shield effectiveness of novel cable is better than the tinned copper wire cable under the similarity condition.Simultaneously can save a large amount of copper materials.

Weaving type telecommunication cable of the present invention makes when guaranteeing good electric property by the improvement of external conductor screen layer material and structure, has improved the bending radius of product, has reduced the volume of cable.Simultaneously, the production of cable and transportation and set up cost and all can decrease, what have great convenience for the user selects for use, is the excellent novel cable of a kind of cost performance.

Above example is the unrestricted technical scheme of the present invention in order to explanation only.Any modification or partial replacement that does not break away from spirit and scope of the invention all should be encompassed in the middle of the claim scope of the present invention.

Claims (3)

1. coaxial communication cable, it comprises an inner wire from inside to outside successively, it extends along the longitudinal axis of cable; Insulating barrier, outer conductor and sheath, this insulating barrier separates internal and external conductor, the outer surface of outer conductor also is coated with screen, it is characterized in that, the material of described screen is the tinning steel-in-copper silk, the percentage by weight of copper is 4-6% in the described screen, and the percentage by weight of tin is 4-6%, and the percentage by weight of steel is 88-92%.

2. coaxial communication cable according to claim 1 is characterized in that, the percentage by weight of copper is 5% in the described screen, and the percentage by weight of tin is 5%, and the percentage by weight of steel is 90%.

3. according to any described coaxial communication cable among the claim 1-2, it is characterized in that the manufacturing process of described tinning steel-in-copper silk is, and is at first at the surface of steel wire coating copper product, zinc-plated at the outer surface of copper again.

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