CN201298399Y

CN201298399Y - Double shielding coaxial cable

Info

Publication number: CN201298399Y
Application number: CNU200820143044XU
Authority: CN
Inventors: 张岩; 徐文广; 延治国; 刘士龙
Original assignee: TIANJIN YIXINTONG TECHNOLOGY Co Ltd
Current assignee: TIANJIN YIXINTONG TECHNOLOGY Co Ltd
Priority date: 2008-11-13
Filing date: 2008-11-13
Publication date: 2009-08-26
Anticipated expiration: 2018-11-13

Abstract

The utility model relates to a double shielding coaxial cable. The coaxial cable comprises a tinned copper conductor, an insulating layer, a tinned ground wire and a single-side aluminum-plastic composite tape arranged from inside to outside in sequence, and a unit coaxial core wire which consists of a polyester film tinned copper wire braided shielding layer and a sheath; and a polyester film, a tear line and the sheath are sequentially arranged outside a plurality of unit coaxial core wires. The coaxial cable has the advantages of high conductivity, high oxidation resistance, no signal dispersion, no leakage and no mutual interference, and helps the connection of late-stage component terminals; furthermore, the coaxial cable has the advantages of steady signal transmission, high capacity of external disturbance resistance, flame retardancy, little pollution to the environment, simple process, steady structure, reduced production cost and improved production efficiency; and the coaxial cable facilitates the realization of high frequency and high speed of signal transmission.

Description

Coaxial cable with double layer screen

Technical field

The utility model relates to a kind of communication cable, particularly a kind of coaxial cable with double layer screen.

Background technology

In recent years, development along with the computer technology and the network communications technology, the digitlization of information, intelligent, the broadband has changed into development today trend, thereby the technology to cable has proposed requirements at the higher level, require cable to have stable input impedance, lower decay, between core and the core and the delay inequality of core inside, far, near-end crosstalks etc. all will reach certain technical requirements, and the technology of existing signal transmission coaxial-cable has lagged behind, performance does not catch up with the high speed development needs, the cable of taking in the present home communications system equipment that mostly is external import, the cost costliness; Perhaps use some bulky domestic substitutes, poor stability, result of use is difficult to reach aspiration level.In addition, along with widening of communication cable institute transmission current increase frequency and frequency band, the corresponding increase of electromagnetic induction effect, interfere with each other between each core, and external interference aggravates thereupon, makes to reduce to disturb, and guarantees that the data information security transmission becomes outstanding problem; On the other hand, because the extensive application of signal-transmitting cable, fire prevention, safety problem such as fire-retardant are serious day by day.

Summary of the invention

In view of the problem that prior art exists, the utility model provides a kind of Stability Analysis of Structures, dependable performance, the coaxial cable with double layer screen that little, the industrial manufacturing cost of volume is lower.This cable has that anti-tampering performance is strong, electric property is stable, can transmit faint analog signal and digital signal reliably, and has characteristics such as fire-retardant, environmental protection.

The utility model for achieving the above object, the technical scheme of being taked is: a kind of coaxial cable with double layer screen, it is characterized in that: comprise the tin-coated copper conductor, insulating barrier, zinc-plated ground wire, the single face aluminium-plastic tape that are provided with successively from inside to outside, the unit coaxial inner conductor that polyester film tinned copper wire woven shield and sheath constitute, described several unit coaxial inner conductor is provided with polyester film, tear line and sheath outward successively.

The beneficial effects of the utility model are: 1, conductor adopts solderability 0.32 tin-coated copper conductor, and conductivity is strong, and good in oxidation resistance is convenient to the connection of later stage assembly terminal, and impedance is little.2, insulating material adopts high-purity, high performance import polyethylene foamed material.Material is even, superior electrical property, dielectric loss is less, and dielectric constant is stable, and anti-high frequency is good, be compared to high-density polyethylene material, the pliability height, easier bending, indeformable, little to the transmission performance influence, even the measured value of " signal attenuation " the most rambunctious index is compared with standard value the remaining of 4-5dB/100m value is arranged also.3, replaced traditional total shielding with single core double layer screen technology generations, each core cross-talk secrecy that the minimizing defective workmanship causes is not enough, when each core carries out the signal transmission respectively, and the shortcoming that has signal to disturb mutually.Can guarantee that signal propagates in medium alone, not scattering of signal does not leak, non-interference.Use double-layer shielding technology, stable signal transmission, each electricity function index is higher than the technology application level fully.Wrapped aluminium strip shielding and the such double-layer shielding structure of braid shielded, shield effectiveness is remarkable, and anti-external interference ability is strong, is more conducive to the signal transmission and realizes high-frequency high-speed, thereby further guaranteed the signal safety of transmission, basic no electromagnetic pollution.4, fire-retardant low smoke and zero halogen environment-friendly materials have been adopted, replace traditional PVC sheath material, when cable burns in accident, polyvinyl chloride can produce a large amount of toxic gases, the low smoke and zero halogen material itself has anti-flaming function, and experiment shows that this material can be from putting out in 30 seconds, do not discharge toxic gas in the burning, pollution-free substantially to environment.5, manufacturability improves, traditional product, and the manufacturing process complexity consumes great human and material resources, financial resources.And the transmission coaxial cable that the utility model provides, technology is simple, and Stability Analysis of Structures can realize on general device with few personnel.Thereby further reduce production costs, enhance productivity.

Description of drawings

Fig. 1 is a structural representation of the present utility model and as Figure of abstract.

Fig. 2 is a unit of the present utility model coaxial inner conductor structural representation.

Embodiment

As Fig. 1, shown in 2, coaxial cable with double layer screen, outside tin-coated copper conductor 11, extrude one deck polyethylene foamed insulating barrier 12, polyethylene foamed foaming insulation layer 12 outer wrapped one deck single face aluminium-plastic tapes 14, aluminium is towards interior wrapped, single face aluminium-plastic tape 14 outer wrapped one deck polyester films 15, polyester film 15 outer establishment one deck tinned copper wire woven shields 16, the tinned copper wire woven shield 16 outer low-smoke halogen-free flame-retardant sheaths 17 that extrude, indulge between polyethylene foamed insulating barrier 12 and the single face aluminium-plastic tape 14 and put a zinc-plated ground wire 13, constituted unit copper shaft core line 1 thus.

The utility model adopts seven root unit coaxial inner conductors 1 to constitute, its arrangement is that the center is a root unit coaxial inner conductor 1, six roots of sensation unit coaxial inner conductor 13 is arranged the wrapped polyester film 2 in outside, back along center circumferential, extrude low-smoke halogen-free flame-retardant sheath 4 at last, be provided with tear line 3 between polyester film 2 and low-smoke halogen-free flame-retardant sheath 4, above structure has constituted the coaxial cable with double layer screen.

Tin-coated copper conductor 11 diameters are 0.32mm, and zinc-plated ground wire 13 diameters are 0.25mm.

Several unit coaxial inner conductor 1 lettering on the sheath of its every root unit coaxial inner conductor 1 makes to bring convenience easier differentiation between the unit coaxial inner conductor 1 to construction.

Unit of the present utility model copper shaft core line adopts double layer screen, and the wrapped single face aluminium-plastic tape of ground floor, aluminium are towards interior wrapped, and vertical Bao Yigen ground wire forms the aluminium strip screen.Ground wire and aluminium strip are formed composite shielding, and ground wire can make unnecessary charge leakage with in signals transmission, thereby reduce the interference of electromagnetic field, improve shield effectiveness; The shielding of second layer braid has effectively stoped the intrusion of external signal, thereby antijamming capability is improved, and is more conducive to the signal transmission and realizes high-speed high frequency, thereby guaranteed safety of data transmission.

Adopt wrapped polyester film between the unit of the present utility model copper shaft core line double layer screen, guarantee that the core screen does not contact, form two-layer independently screen, guarantee screen effect, make electrical property more stable, inner shield effectively prevents the electromagnetic radiation of core to space outerpace; The electromagnetic radiation of space outerpace to electric wire inside stopped in outer shielding again, and two-layer shielding can distinguish ground connection or connect miscellaneous equipment in the use afterwards, thereby effectively eliminated inside and outside electromagnetic interference.

Claims

1, a kind of coaxial cable with double layer screen, it is characterized in that: comprise the tin-coated copper conductor (11), insulating barrier (12), zinc-plated ground wire (13), the single face aluminium-plastic tape (14) that are provided with successively from inside to outside, the unit coaxial inner conductor (1) that polyester film (15) tinned copper wire woven shield (16) and sheath (17) constitute, outer polyester film (2), tear line (3) and the sheath (4) of being provided with successively of described several unit coaxial inner conductors (1).

2, the coaxial cable with double layer screen according to claim 1, it is characterized in that: described several unit coaxial inner conductors (1) are seven, its arrangement is that the center is a root unit coaxial inner conductor (1), and six roots of sensation unit coaxial inner conductor (1) is arranged along center circumferential.

3, the coaxial cable with double layer screen according to claim 1 is characterized in that: described tin-coated copper conductor (11) diameter is 0.32mm.

4, the coaxial cable with double layer screen according to claim 1 is characterized in that: described zinc-plated ground wire (13) is vertical to be placed between insulating barrier (12) and the single face aluminium-plastic tape (14), and zinc-plated ground wire (13) diameter is 0.25mm.

5, the coaxial cable with double layer screen according to claim 1 is characterized in that: described insulating barrier (12) is the polyethylene foamed material.

6, the coaxial cable with double layer screen according to claim 1 is characterized in that: described sheath (17,4) is a halogen-free low-smoke flame retardant material.