CN203386535U

CN203386535U - Coaxial cable

Info

Publication number: CN203386535U
Application number: CN201320459162.2U
Authority: CN
Inventors: 徐冉; 李衡; 李锐; 孙亮; 王惠斌
Original assignee: Guangzhou Zhujiang Digital Group Co Ltd
Current assignee: GUANGZHOU ZHUJIANG DIGITAL MEDIA GROUP CO Ltd
Priority date: 2013-07-30
Filing date: 2013-07-30
Publication date: 2014-01-08
Anticipated expiration: 2023-07-30

Abstract

The utility model discloses a coaxial cable which comprises an inner conductor, an insulating layer, a shielding layer and a sheath in sequence from the inside out, wherein the inner conductor, the insulating layer, the shielding layer and the sheath extend along a longitudinal axis of the cable, and the insulating layer separates the inner conductor from the shielding layer. The coaxial cable is characterized in that the shielding layer is of a four-layer structure and comprises a self-adhesive aluminum-plastic composite shielding tape, an aluminum-magnesium alloy wire woven mesh, a non-self-adhesive aluminum-plastic composite shielding tape and an aluminum-magnesium alloy wire woven mesh in sequence from the inside out; and the outermost layer of the shielding layer and the sheath are provided with a semi-solid state anti-corrosive coating therebetween. Tinned copper wires are replaced by high-strength aluminum-magnesium wires, thereby saving a lot of copper materials, being light in weight, facilitating transportation and erecting construction at the same time, and reducing the cost of transportation and construction. In addition, the coaxial cable is additionally provided with the anti-corrosive coating, thereby being excellent in oxidation resistance and acid and alkali resistance, capable of effectively preventing water vapor or other gases from immerging into the internal part of products, and excellent in anti-corrosion performance. Stable performance can also be kept after long-time use of the products, and the service life of the products can be greatly prolonged.

Description

A kind of coaxial cable

Technical field

The utility model relates to the structure of the coaxial cable used in cable TV network.

Background technology

Along with the development of the integration of three networks and the propelling of light entering and copper back technology, the status that the coaxial cable of last 100 meters is even more important demonstrating of broadcast television industry.The coaxial cable of last 100 meters belongs to drop cable, after laying, can use for a long time, requires longer service life and more stable electric property.Particularly, along with the radio, TV and film industries two-way services are carried out, the requirement of the stability that can provide cable and high bandwidth bearing capacity is also improving.

At present aspect drop cable, four shielded type cables that industry generally adopts, from inside to outside, ground floor is the plastic-aluminum combined mask tape 31 ' of single side self, the second layer is tinned copper wire 32 ', the 3rd layer is used two-sided non-sticky plastic-aluminum combined mask tape 33 ', the 4th layer of use tinned copper wire 34 ', as shown in Figure 1.The larger city in humidity such as southern coastal cities, coaxial cable is used about 5 years, will there will be oxidation at joint and breakage, needs the regular network rebuilding.And, in the drop cable used at present, metal material is heavy metal copper substantially, along with the rise in price of copper material, cable cost is also constantly soaring in recent years.

The utility model content

It is strong that the present invention aims to provide a kind of oxidation resistance, and the coaxial cable that can reduce production costs when guaranteeing electricity function index.

Coaxial cable described in the utility model, comprise successively from inside to outside the inner wire extended along the longitudinal axis of cable, insulating barrier, screen and sheath, insulating barrier separates inner wire, screen, described screen is four-layer structure, be followed successively by from the inside to the outside the plastic-aluminum combined mask tape of self-adhesion, aluminum-magnesium alloy wire mesh grid, the plastic-aluminum combined mask tape of non-self-adhesion and aluminum-magnesium alloy wire mesh grid; Semi-solid corrosion-inhibiting coating is set between screen outermost layer and sheath.

Described inner wire is metal wire, can be the metal wire of any one conductance and the mechanical strength excellence of soft circular copper wire, copper covered steel wire or composite metal wire, as the signal transmission.

Described insulating barrier can be the physical blowing polyethylene, or real core polyethylene.The polyethylene foamed foam degrees be take more than 60% as good, foaming layer is comprised of sealing one by one, independent, uniform vesicle, can not make moist under the condition without being filled with dry gas yet, can prevent the intrusion of aqueous vapor and moisture, effectively guarantee the long-time stability of cable performance.

The plastic-aluminum combined mask tape of ground floor screen-self-adhesion of described screen, can be bilateral structure, also can be single-sided structure, and thickness is advisable with 0.06-0.08 mm.

The second layer screen of described screen-aluminum-magnesium alloy wire mesh grid, density should be not less than 60%, the tensile strength of high-strength aluminium-magnesium B alloy wire should be not less than 296 MPa, elongation at break should be not less than 3%.

The 3rd layer of screen of described screen-plastic-aluminum combined mask tape of non-self-adhesion, can be bilateral structure, also can be single-sided structure, and thickness is advisable with 0.03-0.05 mm.

The 4th layer of screen-aluminum-magnesium alloy wire mesh grid of described screen, density should be not less than 40%, and the tensile strength of high-strength aluminium-magnesium B alloy wire should be not less than 296 MPa, and elongation at break should be not less than 3%.

Semi-solid corrosion-inhibiting coating between described screen outermost layer and sheath can be semi-solid low-molecular-weight polyisobutylene compound, and molecular weight is about 1000-10000.

Described sheath adopts the sheath of polythene material or pvc material, wherein take the sheath of pvc material as good, has good weatherability, can be suitable for outdoor use.

Coaxial cable of the present invention, woven shield material and the structure of existing Weaving type coaxial cable have been changed, replace tinned copper wire with high-intensity magnalium silk, because the proportion of magnalium silk is little, using the great advantage of magnalium silk is in the situation that meet electric property and light 70% left and right of shielding requirements weight ratio tinned copper wire, thereby, can save a large amount of copper materials.Lightweight, facilitated transportation and erection construction simultaneously, reduced transportation and construction cost.In addition, the corrosion-inhibiting coating that the semi-solid low-molecular-weight polyisobutylene compound of environment-friendly type is arranged between sheath of the present invention and screen, there is resistance to oxidation, acid-proof alkaline is good, can effectively resist steam and other gas and immerse interiors of products, the antiseptic property excellence, the long-term use of product still can keep stability, can significantly improve the useful life of product.

By coaxial cable described in the utility model, with existing coaxial cable, carry out following control experiment:

Get coaxial cable sample two classes of the utility model structure, the complete disc that the first kind is 100 meters is stayed, and the making joint is linked to be loop; Equations of The Second Kind is the cable zero load, and the skylight of opening a 5mm*10mm at cable cover(ing), exposes the 4th layer of aluminum-magnesium alloy wire mesh grid.Enchashment in an identical manner has coaxial cable sample two classes.

After the coaxial cable of two class the utility model structures and the coaxial cable sample of prior art combine by the aging three kinds of modes of low temperature aging, high temperature ageing and smog successively, test oxidation resistance and electric property.

1. low temperature aging test (atmospheric low-temperature storage): all test specimens are put into to cryogenic box, and spin manifold temperature remains on-25 ± 3 ℃, and be 24 hours standing time.After off-test, test specimen is placed 16 hours under ordinary atmospheric conditions, then carries out high-temperature circulation test.

2. high-temperature circulation test (constant-pressure and high-temperature storage): all test specimens through low temperature aging are put into to the natural draft baking box, spin manifold temperature remains on 80 ± 2 ℃, in baking oven all air change number of times should be per hour between 8～20 times, whole pyroprocess is 168 hours.After off-test, test specimen under ordinary atmospheric conditions naturally cooling 1 hour, then carry out salt fog test when aging.

3. salt fog ageing test: will be placed on by operating state through the test specimen of high-temperature circulation test in the environment of 40 ± 2 ℃, and implement 5% the continuous atomization of salt solution in space, the duration is 168 hours.After off-test, with circulating water, wash away test specimen surface salt deposit, then rinsing in being no more than the distilled water of 35 ℃, 1-2 hour then under ordinary atmospheric conditions, recovered.

Test data sees the following form:

Coaxial cable after test shows to improve is improved largely on oxidation resistance, and electric property does not change.

The accompanying drawing explanation

Fig. 1 is the schematic diagram of existing coaxial cable structure.

The structural representation that Fig. 2 is coaxial cable described in the utility model.

Embodiment

embodiment mono-

A kind of coaxial cable, as Fig. 2, comprise the inner wire 1 extended along the cable longitudinal axis from inside to outside successively, is coated on insulating barrier 2, screen 3 and the sheath 4 in the described inner wire outside.Wherein, inner wire is soft circular copper wire, and insulating barrier is wrapped in the outer polyethylene foamed layer of inner wire, polyethylene layer outer wrapping screen.Described screen 3 is four-layer structure, be followed successively by from inside to outside the plastic-aluminum combined mask tape 31 of self-adhesion of ground floor, the aluminum-magnesium alloy wire mesh grid 32 of the second layer, the plastic-aluminum combined mask tape 33 of non-self-adhesion of the 3rd layer and the aluminum-magnesium alloy wire mesh grid 34 of the 4th layer, sheath covers the outside of screen.Fill semi-solid low-molecular-weight polyisobutylene compound coat between the outermost layer of sheath and screen, molecular weight is about 1000-10000.

The ground floor of described screen 3 is the plastic-aluminum combined mask tape 31 of self-adhesion, is bilateral structure, and thickness is 0.08mm; The second layer is aluminum-magnesium alloy wire mesh grid 32, and its count is not less than 60%, and tensile strength is not less than 296MPa, and elongation at break is not less than 3%; The 3rd layer is the plastic-aluminum combined mask tape 33 of non-self-adhesion, is single-sided structure, and thickness is 0.03 mm; The 4th layer is aluminum-magnesium alloy wire mesh grid 34, and count is not less than 40%, and tensile strength is not less than 296MPa, and elongation at break is not less than 3%; Sheath 4 is pvc sheath.

embodiment bis-

A kind of coaxial cable, as Fig. 2, comprise the inner wire 1 extended along the cable longitudinal axis from inside to outside successively, is coated on insulating barrier 2, screen 3 and the sheath 4 in the described inner wire outside.Wherein, inner wire is copper covered steel wire, and insulating barrier is wrapped in the outer expanded polyolefin layer of inner wire, expanded polyolefin layer outer wrapping screen.Described screen 3 is four-layer structure, be followed successively by from inside to outside the plastic-aluminum combined mask tape 31 of self-adhesion of ground floor, the aluminum-magnesium alloy wire mesh grid 32 of the second layer, the plastic-aluminum combined mask tape 33 of non-self-adhesion of the 3rd layer and the aluminum-magnesium alloy wire mesh grid 34 of the 4th layer, sheath covers the outside of screen.Fill semi-solid low-molecular-weight polyisobutylene compound between the outermost layer of sheath and screen, molecular weight is about 4000-6000.

The ground floor of described screen 3 is the plastic-aluminum combined mask tape 31 of self-adhesion, is single-sided structure, thickness 0.06 mm; The second layer is aluminum-magnesium alloy wire mesh grid 32, and its count is not less than 60%, and tensile strength is for being not less than 296MPa, and elongation at break is for being not less than 3%; The 3rd layer is the plastic-aluminum combined mask tape 33 of non-self-adhesion, is bilateral structure, and thickness is 0.05 mm; The 4th layer is aluminum-magnesium alloy wire mesh grid 34, and count is not less than 40%, and tensile strength is not less than 296MPa, and elongation at break equals to be not less than 3%; Sheath 4 is pvc sheath.

Claims

1. a coaxial cable, comprise successively from inside to outside the inner wire extended along the longitudinal axis of cable, insulating barrier, screen and sheath, insulating barrier separates inner wire, screen, it is characterized in that: described screen is four-layer structure, be followed successively by from the inside to the outside the plastic-aluminum combined mask tape of self-adhesion, aluminum-magnesium alloy wire mesh grid, the plastic-aluminum combined mask tape of non-self-adhesion and aluminum-magnesium alloy wire mesh grid; Semi-solid corrosion-inhibiting coating is set between screen outermost layer and sheath.

2. coaxial cable according to claim 1, it is characterized in that: described inner wire is metal wire, any one in soft circular copper wire, copper covered steel wire or composite metal wire.

3. coaxial cable according to claim 1, it is characterized in that: described insulating barrier is the physical blowing polyethylene, or real core polyethylene.

4. coaxial cable according to claim 1, it is characterized in that: the plastic-aluminum combined mask tape of ground floor self-adhesion of described screen is bilateral structure or single-sided structure.

5. coaxial cable according to claim 1, it is characterized in that: the density of the aluminum-magnesium alloy wire mesh grid of the described screen second layer is not less than 60%, and tensile strength is not less than 296 MPa, and elongation at break is not less than 3%.

6. coaxial cable according to claim 1, it is characterized in that: the plastic-aluminum combined mask tape of non-self-adhesion that described screen is the 3rd layer is bilateral structure or single-sided structure.

7. coaxial cable according to claim 1, it is characterized in that: the aluminum-magnesium alloy wire mesh grid density that described screen is the 4th layer is not less than 40%, and tensile strength is not less than 296 MPa, and elongation at break is not less than 3%.

8. coaxial cable according to claim 1, it is characterized in that: the semi-solid corrosion-inhibiting coating between described screen outermost layer and sheath is semi-solid low-molecular-weight polyisobutylene compound, and molecular weight is 1000-10000.

9. coaxial cable according to claim 1, is characterized in that: the sheath that described sheath is polyethylene or pvc material.

10. coaxial cable according to claim 1, it is characterized in that: described insulating barrier is the physical blowing polyethylene, foam degrees is more than 60%.