CN2559080Y - Coaxial cable - Google Patents
Coaxial cable Download PDFInfo
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- CN2559080Y CN2559080Y CN 02231768 CN02231768U CN2559080Y CN 2559080 Y CN2559080 Y CN 2559080Y CN 02231768 CN02231768 CN 02231768 CN 02231768 U CN02231768 U CN 02231768U CN 2559080 Y CN2559080 Y CN 2559080Y
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- coaxial cable
- cable
- external diameter
- insulating barrier
- single core
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Abstract
The utility model relates to a coaxial cable, formed by eight single-core concentric cables coated by the polyester film and the outest outer jacket through 1+7 regular twist; each single-core concentric cable is arranged orderly from inside to outside with an inner conductor, an insulating barrier, an earthing conductor, a single-core metal woven shield and an inner jacket. The coaxial cable is characterized in that the insulating barrier is made of polyethylene foamed material; a total metal woven shield is arranged between the polyester film and the outer jacket and is knitted from the tin plating annealed copper wire, and the knitting tightness is greater than 90 percent. Due to the total metal woven shield added, the coaxial cable of the utility model has the capacity of powerful electromagnetic interference resistance and its total outer diameter is smaller; owing to the insulating barrier adopting polyethylene foamed material, the flexibility is not affected.
Description
Technical field
The utility model relates to the used communication cable of communication field, more particularly, relates to the more good coaxial cable of a kind of performance, is mainly used in the transmission of E1 signal.
Background technology
In the communications field, often use 75 ohm coaxial cable to transmit the E1 signal, wherein especially be that the coaxial cable of SYV75 series uses the most general with the model.When needs used multicore cable, often adopting 8 single-core cable twistings was 8 core coaxial cables, and for example cable SYV75-2-1x8 can adopt the regular stranded mode of 1+7 to obtain by 8 single-core cable SYV75-2-1.The cross section structure of cable SYV75-2-1x8 mainly is made up of braided outer conductor 4, inner wire 5, insulating barrier 8, polyester film 7 and the inserts 6 etc. of oversheath 1, earthing conductor 2, internal layer sheath 3, single-core cable as shown in Figure 1.Used main material, physical dimension and the electric property of this cable is respectively shown in table 1, table 2 and table 3:
The used main material of table 1-cable SYV75-2-1x8
| Project | Inner wire and earthing conductor | Insulating barrier | Single core woven shield | Inside and outside sheath | Total braiding screen |
| Material | The sub-thread bare copper wire | Solid polyethylene | Soft circular copper wire | Flame-proof polyvinyl chloride | Do not have |
The physical dimension (mm of unit) of table 2-cable SYV75-2-1x8
| Model | Conductor diameter | The insulating barrier external diameter | Metal knitted density | The finished product external diameter |
| SYV75-2-1x8 | 0.252±0.005 | 1.95±0.05 | ＞90％ | 14.3±0.3 |
| SYV75-2-1 | 0.252±0.005 | 1.95±0.05 | ＞90％ | 2.9±0.1 |
The electric property of table 3-cable SYV75-2-1x8
| Project | Condition (frequency, temperature etc.) | Index | Unit |
| Characteristic impedance | 1～2MHz | 75±5 | |
| 2～10MHz | 75±3 | Ω | |
| Attenuation constant | 1MHz | ≤2.1 | dB/100m |
| 2MHz | ≤3.2 | dB/100m | |
| 4MHz | ≤4.3 | dB/100m | |
| 10MHz | ≤7.3 | dB/100m | |
| Electric capacity | ≤72 | pF/m | |
| Far-end crosstalk | 1MHz | ≥80 | dB/100m |
| Insulation resistance | In the time of 20 ℃ | ≥10000 | MΩ |
| Conductor DC resistance | In the time of 20 ℃ | ≤365 | Ω/km |
| Withstand voltage | AC1500V 1min | Do not puncture |
As can be seen from Table 2, total external diameter of cable SYV75-2-1x8 is bigger, it is 14.3 millimeters, and communication equipment to go out line density increasing, under satisfying in the relevant criterion condition that electric property to such cable, physical and mechanical properties, fire resistance etc. require equally, wish that the external diameter of cable is the smaller the better.So model occurred is the 8 core coaxial cables of SFYZ75-2-1x8, the cross section structure of this cable as shown in Figure 2, as seen the cable SYV75-2-1x8 shown in its structure and Fig. 1 is basic identical, uniquely different be, between inner wire 5 and solid polyethylene layer 8, one deck fluoroplastics 9 have been increased, be equivalent to have inside and outside dielectric layers, inner insulating layer is fluoroplastics 9, and external insulation layer is solid polyethylene 8.Used main material, physical dimension and the electric property of cable SFYZ75-2-1x8 is respectively shown in table 4, table 5 and table 6:
The used main material of table 4-cable SFYZ75-2-1x8
| Project | Inner wire and earthing conductor | Insulating barrier | Single core woven shield | Inside and outside sheath | Total braiding screen | |
| Inner insulating layer | External insulation layer | |||||
| Material | The sub-thread bare copper wire | Fluoroplastics | Solid polyethylene | Soft circular copper wire | Flame-proof polyvinyl chloride | Do not have |
The physical dimension (mm of unit) of table 5-cable SFYZ75-2-1x8
| Model | Conductor diameter | The insulating barrier external diameter | Metal knitted density | The finished product external diameter | |
| Inner insulating layer | External insulation layer | ||||
| SFYZ75-2-1x8 | 0.252±0.005 | 0.55±0.05 | 1.47±0.05 | ＞90％ | 9.8±0.2 |
| SFYZ75-2-1 | 0.252±0.005 | 0.55±0.05 | 1.47±0.05 | ＞90％ | 2.6±0.1 |
The electric property of table 6-cable SFYZ75-2-1x8
| Project | Condition (frequency, temperature etc.) | Index | Unit |
| Characteristic impedance | 1～2MHz | 75±5 | |
| 2～10MHz | 75±3 | Ω | |
| Attenuation constant | 1MHz | ≤2.9 | dB/100m |
| 2MHz | ≤4.0 | dB/100m | |
| 4MHz | ≤5.7 | dB/100m | |
| 10MHz | ≤9 | dB/100m | |
| Electric capacity | ≤72 | pF/m | |
| Far-end crosstalk | 1MHz | ≥100 | dB/100m |
| Insulation resistance | In the time of 20 ℃ | ≥10000 | MΩ |
| Conductor DC resistance | In the time of 20 ℃ | ≤365 | Ω/km |
| Withstand voltage | AC1500V 1min | Do not puncture |
Be at conductor diameter under 0.252 millimeter the situation, the parameters of cable SYV75-2-1x8 and cable SFYZ75-2-1x8 is compared and can find: the attenuation constant of cable SFYZ75-2-1x8 is bigger, but total external diameter has reduced 4.5 millimeters, reduce approximately 31%, improved the line density that of equipment greatly.
In the E1 cable type selecting of turnover rack in early days, often use the cable of above-mentioned two kinds of models, but without any the electromagnetic shielding safeguard measure.But along with the development of electronic product, more and more higher to the requirement of electronic equipment EMC aspect, often need select multicore coaxial cable for use with total metal knitted screen.Adding up metal knitted screen on the basis of existing multicore cable is a kind of better solution, but two unfavorable factors are arranged: the one, its total external diameter will strengthen, after adding up metal knitted screen as SFYZ75-2-1x8, its model is SFYZP75-2-1x8, total external diameter becomes 11 millimeters by original 9.8 millimeters, has reduced the line density that of equipment; The 2nd, increase total metal knitted screen after, the flexibility variation of cable brings very big inconvenience for the processing and the installation of cable.
The utility model content
The technical problems to be solved in the utility model is, at existing 8 core coaxial cables do not have total metal knitted screen and increase the back external diameter can be too big, flexibility can variation etc. defective, a kind of 8 new core coaxial cables are provided, when making it have total metal knitted screen, external diameter is littler, and flexibility also is further improved.
The technical solution of the utility model is, construct a kind of coaxial cable, by 8 single core coaxial cables by regular stranded the forming of 1+7, and described 8 single core coaxial cables are encased by polyester film and outermost oversheath, each root single core coaxial cable is inner wire, insulating barrier, earthing conductor, single core metal woven shield and inner sheath from inside to outside successively, it is characterized in that, described insulating barrier is made for the polyethylene foamed material, also is provided with the total metal knitted screen of one deck between described polyester film and the oversheath.
In coaxial cable described in the utility model, described insulating barrier is the polyethylene foamed of low dielectric loss, and its external diameter is 1.2 ± 0.05mm, and insulation resistance is greater than 10000M Ω Km.
In coaxial cable described in the utility model, described total metal knitted screen is that the tin annealed copper wire braiding forms, its count is greater than 90%, its specification is 24 * 11 * 0.12, expression wherein has 24 ingots braiding tin annealed copper wire, each ingot has 11 copper cash, and the external diameter of every copper cash is 0.12mm.
In coaxial cable described in the utility model, described inner wire and earthing conductor all are the sub-thread bare copper wires, and its diameter is all 0.252 ± 0.005mm; Described single core metal woven shield (4) forms for soft circular copper wire braiding, and its count is greater than 90%, and specification is 16 * 6 * 0.08, and expression wherein has 16 ingots braiding copper cash, and each ingot has 6 copper cash, and the external diameter of every copper cash is 0.08mm; The inner sheath of described single core coaxial cable is a flame-proof polyvinyl chloride, and its external diameter is 2.2 ± 0.1mm.
In coaxial cable described in the utility model, described oversheath is a flame-proof polyvinyl chloride, its external diameter 9.6 ± 0.2mm.
In the coaxial cable of the present utility model, owing to increased a total metal knitted screen, make it to have stronger anti-electromagnetic interference capability and total external diameter is littler, simultaneously because its insulating barrier adopts the polyethylene foamed material, material is than solid polyethylene softness, so its flexibility does not affect adversely after increasing total metal knitted screen, whole flexibility is better.
The utility model is described in further detail below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the cross section structure figure of cable SYV75-2-1x8 in the prior art;
Fig. 2 is the cross section structure figure of cable SFYZ75-2-1x8 in the prior art;
Fig. 3 is the cross section structure figure of 8 core coaxial cables in the utility model;
Fig. 4 is the cross section structure figure of single core coaxial cable employed in figure 3.
Embodiment
Though industry is being pursued the line density that exceeds of telecommunication cable always, pursue the good EMC performance of cable, but untappedly always go out thisly in the utility model to have total metal knitted screen of tool and insulating barrier to adopt the little 8 core coaxial cables to 9.6 millimeters of polyethylene foamed, total external diameter.
But the single-core cable called after SYFVZ75-1-1 among the utility model embodiment, its cross section structure are as shown in Figure 4, wherein:
Single core metal woven shield 4 forms for soft circular copper wire braiding, and its count is greater than 90%, and specification is 16 * 6 * 0.08, and expression braiding copper cash has 16 ingots, and each ingot has 6 copper cash, and the external diameter of every copper cash is 0.08mm;
Be an earthing conductor 2 between single core metal woven shield 4 and insulating barrier 10, this earthing conductor also is the sub-thread bare copper wire, and its diameter is 0.252 ± 0.05mm;
The most external of single-core cable is the inner sheath 3 that flame-proof polyvinyl chloride is made, and the external diameter of this inner sheath 3 is 2.2 ± 0.1mm.
The cross section structure of 8 core coaxial cables among the utility model embodiment as shown in Figure 3 can be with its called after SYFVZP75-1-1x8, wherein:
Total metal knitted screen 11 is a tin annealed copper wire, and its count is greater than 90%, and specification is 24 * 11 * 0.12, and expression wherein weaves copper cash 24 ingots, and each ingot has 11 copper cash, and the external diameter of every copper cash is 0.12mm;
The outermost sheath 1 of cable is a flame-proof polyvinyl chloride, total external diameter 9.6 ± 0.2mm.
For the ease of relatively, now list the employed material of the utility model cable SYFVZP75-2-1x8, physical dimension and electric property, respectively shown in table 7, table 8 and table 9.
The used main material of table 7-cable SYFVZP75-1-1x8
| Project | Inner wire and earthing conductor | Insulating barrier | Single core woven shield | Inside and outside sheath | Total braiding screen |
| Material | The sub-thread bare copper wire | Polyethylene foamed | Soft circular copper wire | Flame-proof polyvinyl chloride | Tin annealed copper wire |
The used main material (mm of unit) of table 8-cable SYFVZP75-1-1x88
| Model | Conductor diameter | The insulating barrier external diameter | Metal knitted density | The finished product external diameter |
| SYFVZP75-2-1x8 | 0.252±0.005 | 1.2±0.1 | ＞90％ | 9.6±0.3 |
| SYFVZ75-2-1 | 0.252±0.005 | 1.2±0.1 | ＞90％ | 2.2±0.1 |
The electric property of table 9-cable SYFVZP75-1-1x8
| Project | Condition (frequency, temperature etc.) | Index | Unit |
| Characteristic impedance | 1～2MHz | 75±5 | |
| 2～10MHz | 75±3 | Ω | |
| Attenuation constant | 1MHz | ≤2.9 | dB/100m |
| 2MHz | ≤4.0 | dB/100m | |
| 4MHz | ≤5.7 | dB/100m | |
| 10MHz | ≤9 | dB/100m | |
| Electric capacity | ≤72 | pF/m | |
| Far-end crosstalk | 1MHz | ≥100 | dB/100m |
| Insulation resistance | In the time of 20 ℃ | ≥10000 | MΩ |
| Conductor DC resistance | In the time of 20 ℃ | ≤365 | Ω/km |
| Withstand voltage | AC1500V 1min | Do not puncture |
With model is that the various performances of three kinds of cables of SYV75-2-1x8, SFYZ75-2-1x8, SYFVZP75-2-1x8 compare, as can be seen:
1, two kinds of cables of SYV75-2-1x8, SFYZ75-2-1x8 do not have total metal knitted screen, and the utility model has one deck density greater than 90% total metal knitted screen 11, not only improved the shield effectiveness of cable in transmission course greatly, the bad problem of EMC in the time of cable can also effectively be solved going out rack.
Though 2, the utility model has increased total metal knitted screen, total external diameter does not increase, and SYV75-2-1x8 compares with cable, reduces greatly, SFYZ75-2-1x8 compares with cable, also slightly reduces, and has improved the line density that of cable in the unit are.
3, insulating barrier 10 of the present utility model adopts polyethylene foamed, material is than the solid polyethylene softness of insulating barrier 8 in preceding two kinds of cables, contribute very big to the flexibility that improves cable, do not affect adversely so the utility model increases total metal knitted screen 11 its flexibilities of back, be optimized on the contrary.
Claims (8)
1, a kind of coaxial cable, by 8 single core coaxial cables by regular stranded the forming of 1+7, and described 8 single core coaxial cables are encased by film (7) and outermost oversheath (1), each root single core coaxial cable is inner wire (5), insulating barrier (10), earthing conductor (2), single core metal woven shield (4) and inner sheath (3) from inside to outside successively, it is characterized in that, described insulating barrier (10) is made for the polyethylene foamed material, also is provided with the total metal knitted screen of one deck (11) between described film (7) and the oversheath (1).
2, coaxial cable according to claim 1 is characterized in that, described insulating barrier (10) is the polyethylene foamed of low dielectric loss, and its external diameter is 1.2 ± 0.05mm, and insulation resistance is greater than 10000M Ω Km.
3, coaxial cable according to claim 1 is characterized in that, described total metal knitted screen (11) forms for the tin annealed copper wire braiding, and its count is greater than 90%.
4, coaxial cable according to claim 3 is characterized in that, the specification of described total metal knitted screen (11) is 24 * 11 * 0.12, and expression wherein has 24 ingots braiding tin annealed copper wire, and each ingot has 11 copper cash, and the external diameter of every copper cash is 0.12mm.
5, coaxial cable according to claim 1 is characterized in that, described inner wire (5) and earthing conductor (2) all are the sub-thread bare copper wires, and its diameter is all 0.252 ± 0.005mm.
6, coaxial cable according to claim 1, it is characterized in that, described single core metal woven shield (4) forms for soft circular copper wire braiding, its count is greater than 90%, specification is 16 * 6 * 0.08, expression wherein has 16 ingots braiding copper cash, and each ingot has 6 copper cash, and the external diameter of every copper cash is 0.08mm.
7, coaxial cable according to claim 1 is characterized in that, the inner sheath of described single core coaxial cable (3) is a flame-proof polyvinyl chloride, and its external diameter is 2.2 ± 0.1mm.
According to each described coaxial cable among the claim 1-7, it is characterized in that 8, described film (7) is a polyester film; Described oversheath (1) is a flame-proof polyvinyl chloride, its external diameter 9.6 ± 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02231768 CN2559080Y (en) | 2002-04-22 | 2002-04-22 | Coaxial cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02231768 CN2559080Y (en) | 2002-04-22 | 2002-04-22 | Coaxial cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2559080Y true CN2559080Y (en) | 2003-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02231768 Expired - Fee Related CN2559080Y (en) | 2002-04-22 | 2002-04-22 | Coaxial cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2559080Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375204C (en) * | 2004-06-30 | 2008-03-12 | 日立电线株式会社 | Differential signal transmission cable |
| WO2008074179A1 (en) * | 2006-12-04 | 2008-06-26 | Zte Corporation | A coaxial cable and its manufacturing approach |
| CN104672691A (en) * | 2013-11-29 | 2015-06-03 | 上海凯波特种电缆料厂有限公司 | Foamed polyvinyl chloride cable |
-
2002
- 2002-04-22 CN CN 02231768 patent/CN2559080Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375204C (en) * | 2004-06-30 | 2008-03-12 | 日立电线株式会社 | Differential signal transmission cable |
| WO2008074179A1 (en) * | 2006-12-04 | 2008-06-26 | Zte Corporation | A coaxial cable and its manufacturing approach |
| CN104672691A (en) * | 2013-11-29 | 2015-06-03 | 上海凯波特种电缆料厂有限公司 | Foamed polyvinyl chloride cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20030702 Termination date: 20100422 |