CN202711847U - Shielded type digital symmetrical cable - Google Patents
Shielded type digital symmetrical cable Download PDFInfo
- Publication number
- CN202711847U CN202711847U CN 201220353935 CN201220353935U CN202711847U CN 202711847 U CN202711847 U CN 202711847U CN 201220353935 CN201220353935 CN 201220353935 CN 201220353935 U CN201220353935 U CN 201220353935U CN 202711847 U CN202711847 U CN 202711847U
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- cable
- type digital
- crossing skeleton
- layer
- shield type
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Abstract
The utility model provides a shielded type digital symmetrical cable, which comprises a cross framework, an inner wrapping layer, a shielding layer, an outer wrapping layer and an outer jacket arranged in turn from centre to outside, wherein the cross framework and the inner wrapping layer form four chambers; each chamber is provided with a twisted line set; the twisted line set is formed by twisting two signal insulation lines; each single insulation line comprises a line core and an insulation layer; the insulation layer is wrapped outside the line core; and the cross framework is a polyethylene cross framework. The shielded type digital symmetrical cable disclosed by the utility model has good flexibility and is convenient to wire and construct; due to the cross framework, the tensile property and the compression resistance of the cable are increased; by arranging the twisted pitch, the balance characteristic of the cable by using the twisted lien set in low-frequency interference is effectively offset, therefore, the good working condition of the cable in low-frequency interference is ensured; furthermore, crosstalk can be controlled when data frequency is higher.
Description
Technical field
The utility model relates to a kind of cable, relates in particular to a kind of shield type digital symmetric electric cable.
Background technology
Digital communications network is constantly to multi-functional, large capacity, high-frequency and two-forty development, shielding properties to the anti-electromagnetic interference of cable for digital communication is had higher requirement, the shielding properties of the screen of cable shield effectiveness when frequency is higher is more obvious, but how the interference when lower frequency solves the antijamming capability that also affects whole cable.Simultaneously, cable in use easily is stressed, and the structural change of cable is exerted an influence, and should guarantee that with this cable structure when being subject to certain extruding force is still stable, thereby does not affect the normal use of cable.
The utility model content
The purpose of this utility model provides a kind of shield type digital symmetric electric cable, and to solve shielding properties shield effectiveness when frequency is higher of screen of cable more obvious, but how the interference when lower frequency solves the problem of the antijamming capability that also affects whole cable.
Technical solution of the present utility model is:
A kind of shield type digital symmetric electric cable, comprise the crossing skeleton that is outwards set gradually by the center, interior belting layer, screen, outer belting layer and oversheath, described crossing skeleton and described interior belting layer form four chambers, be equipped with the twisted pair wire group in each described chamber, described twisted pair wire group is stranded the forming of two eradication edge single lines, described insulated single wire comprises core and insulating barrier, described core is wrapped with insulating barrier, described core is the annealed copper core, described insulating barrier is solid polyethylene layer, described crossing skeleton is the polyethylene crossing skeleton, and the external diameter of described crossing skeleton is 4.5mm-5.2mm, and the vane thickness of described crossing skeleton is 0.021mm-0.03mm, described interior belting layer is the polyester band, described screen is the double-layer aluminum-foil screen, and described outer belting layer is the polyester band, and described oversheath is the polyolefin oversheath.
Further improve and be: the pair twist pitch of described twisted pair wire group is 16.4mm-17.8mm.
Further improve and be: the diameter of described copper core is 0.57mm-0.58mm.
Further improve and be: the thickness of described oversheath is 0.6-0.7mm.
Further improve and be: be filled with waterproofing rope in the described chamber.
A kind of shield type digital symmetric electric cable of the utility model, adopt softer low density polyethylene (LDPE) crossing skeleton, make crossing skeleton can isolate twisted pair wire group and stable electrical cable structure, but crossing skeleton should not be too large, external diameter is 4.5mm-5.2mm, and vane thickness is 0.021mm-0.03mm.When stranding, cross the fixedly position of twisted pair wire group and crossing skeleton of line guide die by special use, four twisted pair wire groups are embedded in four chambers, and simultaneously stranded moulding is for preventing the Damage to insulation core, add one deck polyester band wrapped, form a highly stable cable core structure.Because crossing skeleton is softer and tiny, make cable have good flexibility simultaneously, make things convenient for cable wiring manufacture.And from setting angle, crossing skeleton has improved tensile property and the anti-extrusion performance of cable, and aspect bending required, because crossing skeleton being arranged, even cable is crooked excessive, the construction of cable also was not easy to change.
The screen of this kind shield type digital symmetric electric cable adopts the double-layer aluminum-foil shielding, and by outer belting layer screen is fixed further.When the frequency of interfere with electromagnetic field is higher, utilize the eddy current that produces in the metal material of low-resistivity, externally come electromagnetic wave to form negative function, thereby reach the effect of shielding.If can not carry out effective filtering to data line, that just requires in the 30-1000MHz scope interference such as radio frequency, static to be shielded.Cable shield must cooperate with outer cover by 360 ° metallic bone.The screen of this kind shield type digital symmetric electric cable adopts the double-layer aluminum-foil shielding.For the electromagnetic wave more than 10 MHz, utilize reflection, absorption and the kelvin effect of screen to eliminate external electromagnetic interference and externally electromagnetic radiation.So-called kelvin effect refers to that electric current is tending towards conductive surface in the distribution of cross-sectional area of conductor with the rising of frequency.Frequency is higher, and skin depth is less, and namely electromagnetic penetration capacity is more weak.Therefore, frequency is higher, and the effect of screen is more obvious.Electromagnetic wave can only see through the thick aluminium foil of 38 μ m when frequency surpasses 5 MHz.If the thickness of screen surpasses 38 μ m, just make the electromagnetic interference frequency that enters cable inside through screen mainly below 5 MHz, and can effectively offset with the equilibrium response of twisted pair wire group for the low-frequency disturbance below 5 MHz.
When adopting the twisted pair wire group, the pair twist pitch is less, and anti-interference just better, transmission band is just higher.When the pair twist pitch is l=25n (mm) (n〉1), nearly 20 dB of attenuation.This kind shield type digital symmetric electric cable pair twist pitch is 16.4mm-17.8mm, and during for the low-frequency disturbance below 5 MHz, working condition is good, and can control cross-talk when data frequency is higher.
The beneficial effects of the utility model are: a kind of shield type digital symmetric electric cable of the utility model, have good flexibility, and make things convenient for cable wiring manufacture.And from setting angle, crossing skeleton has improved tensile property and the anti-extrusion performance of cable, and aspect bending required, even owing to there being the crossing skeleton cable crooked excessive, cable structure also was not easy to change.This kind shield type digital symmetric electric cable makes cable use the equilibrium response of twisted pair wire group effectively to offset in low-frequency disturbance by the setting of pair twist pitch, thereby guarantee that cable working condition when low-frequency disturbance is good, and when data frequency is higher, can control cross-talk.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Wherein: belting layer in the 1-crossing skeleton, 2-, 3-screen, the outer belting layer of 4-, 5-oversheath, 6-core, 7-insulating barrier, 8-chamber.
Embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the present embodiment provides a kind of shield type digital symmetric electric cable, comprise the crossing skeleton 1 that is outwards set gradually by the center, interior belting layer 2, screen 3, outer belting layer 4 and oversheath 5, described crossing skeleton 1 forms four chambers 8 with described interior belting layer 2, be equipped with the twisted pair wire group in each described chamber 8, described twisted pair wire group is stranded the forming of two eradication edge single lines, described insulated single wire comprises core 6 and insulating barrier 7, described core 6 is wrapped with insulating barrier 7, described core 6 is the annealed copper core, described insulating barrier 7 is solid polyethylene layer, described crossing skeleton 1 is polyethylene crossing skeleton 1, the external diameter of described crossing skeleton 1 is 4.8mm, the vane thickness of described crossing skeleton 1 is 0.023mm, described interior belting layer 2 is the polyester band, described screen 3 is the double-layer aluminum-foil screen, described outer belting layer 4 is the polyester band, described oversheath 5 is the polyolefin oversheath, the pair twist pitch of described twisted pair wire group is 16.8mm, the diameter of described copper core is 0.574mm, the thickness of described oversheath 5 is 0.65mm, is filled with waterproofing rope in the described chamber 8.
A kind of shield type digital symmetric electric cable of the present embodiment adopts softer low density polyethylene (LDPE) crossing skeleton, make crossing skeleton 1 can isolate twisted pair wire group and stable electrical cable structure, but crossing skeleton 1 should not be too large, and external diameter is 4.8mm, and vane thickness is 0.023mm.When stranding, cross the fixedly position of twisted pair wire group and crossing skeleton 1 of line guide die by special use, four twisted pair wire groups are embedded in four chambers 8, and simultaneously stranded moulding is for preventing the Damage to insulation core, add one deck polyester band wrapped, form a highly stable cable core structure.Owing to the cross bone, 1 is softer and tiny, makes cable have good flexibility, makes things convenient for cable wiring manufacture simultaneously.And from setting angle, crossing skeleton 1 has improved tensile property and the anti-extrusion performance of cable, and aspect bending required, because crossing skeleton 1 being arranged, even cable is crooked excessive, the construction of cable also was not easy to change.
The screen of this kind shield type digital symmetric electric cable adopts the double-layer aluminum-foil shielding, and fixes further by 4 pairs of screens 3 of outer belting layer.When the frequency of interfere with electromagnetic field is higher, utilize the eddy current that produces in the metal material of low-resistivity, externally come electromagnetic wave to form negative function, thereby reach the effect of shielding.If can not carry out effective filtering to data line, that just requires in the 30-1000MHz scope interference such as radio frequency, static to be shielded.Cable shield must cooperate with outer cover by 360 ° metallic bone.The screen of this kind shield type digital symmetric electric cable adopts the double-layer aluminum-foil shielding.For the electromagnetic wave more than 10 MHz, utilize reflection, absorption and the kelvin effect of screen 3 to eliminate external electromagnetic interference and externally electromagnetic radiation.So-called kelvin effect refers to that electric current is tending towards conductive surface in the distribution of cross-sectional area of conductor with the rising of frequency.Frequency is higher, and skin depth is less, and namely electromagnetic penetration capacity is more weak.Therefore, frequency is higher, and the effect of screen 3 is more obvious.Electromagnetic wave can only see through the thick aluminium foil of 38 μ m when frequency surpasses 5 MHz.If the thickness of screen 3 surpasses 38 μ m, just make the electromagnetic interference frequency that enters cable inside through screen 3 mainly below 5 MHz, and can effectively offset with the equilibrium response of twisted pair wire group for the low-frequency disturbance below 5 MHz.
When adopting the twisted pair wire group, the pair twist pitch is less, and anti-interference just better, transmission band is just higher.When the pair twist pitch is l=25n (mm) (n〉1), nearly 20 dB of attenuation.This kind shield type digital symmetric electric cable pair twist pitch is 16.4mm-17.8mm, and during for the low-frequency disturbance below 5 MHz, working condition is good, and can control cross-talk when data frequency is higher.
The beneficial effect of the present embodiment is: a kind of shield type digital symmetric electric cable of the present embodiment, have good flexibility, and make things convenient for cable wiring manufacture.And from setting angle, crossing skeleton has improved tensile property and the anti-extrusion performance of cable, and aspect bending required, even owing to there being the crossing skeleton cable crooked excessive, cable structure also was not easy to change.This kind shield type digital symmetric electric cable makes cable use the equilibrium response of twisted pair wire group effectively to offset in low-frequency disturbance by the setting of pair twist pitch, thereby guarantee that cable working condition when low-frequency disturbance is good, and when data frequency is higher, can control cross-talk.
Claims (5)
1. shield type digital symmetric electric cable, it is characterized in that: comprise the crossing skeleton (1) that is outwards set gradually by the center, interior belting layer (2), screen (3), outer belting layer (4) and oversheath (5), described crossing skeleton (1) forms four chambers (8) with described interior belting layer (2), be equipped with the twisted pair wire group in each described chamber (8), described twisted pair wire group is stranded the forming of two eradication edge single lines, described insulated single wire comprises core (6) and insulating barrier (7), described core (6) is wrapped with insulating barrier (7), described core (6) is the annealed copper core, described insulating barrier (7) is solid polyethylene layer, described crossing skeleton (1) is polyethylene crossing skeleton (1), the external diameter of described crossing skeleton (1) is 4.5mm-5.2mm, the vane thickness of described crossing skeleton (1) is 0.021mm-0.03mm, described interior belting layer (2) is the polyester band, described screen (3) is the double-layer aluminum-foil screen, described outer belting layer (4) is the polyester band, and described oversheath (5) is the polyolefin oversheath.
2. a kind of shield type digital symmetric electric cable as claimed in claim 1, it is characterized in that: the pair twist pitch of described twisted pair wire group is 16.4mm-17.8mm.
3. a kind of shield type digital symmetric electric cable as claimed in claim 1 or 2, it is characterized in that: the diameter of described copper core is 0.57mm-0.58mm.
4. a kind of shield type digital symmetric electric cable as claimed in claim 1 or 2, it is characterized in that: the thickness of described oversheath (5) is 0.6-0.7mm.
5. a kind of shield type digital symmetric electric cable as claimed in claim 1 or 2, it is characterized in that: described chamber is filled with waterproofing rope in (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220353935 CN202711847U (en) | 2012-07-20 | 2012-07-20 | Shielded type digital symmetrical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220353935 CN202711847U (en) | 2012-07-20 | 2012-07-20 | Shielded type digital symmetrical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202711847U true CN202711847U (en) | 2013-01-30 |
Family
ID=47592127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220353935 Expired - Fee Related CN202711847U (en) | 2012-07-20 | 2012-07-20 | Shielded type digital symmetrical cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202711847U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779579A (en) * | 2012-07-20 | 2012-11-14 | 安徽江淮电缆集团有限公司 | Shielding type digital symmetrical cable |
| CN103295674A (en) * | 2013-05-16 | 2013-09-11 | 江苏亨通线缆科技有限公司 | Anti-interference composite data cable |
-
2012
- 2012-07-20 CN CN 201220353935 patent/CN202711847U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779579A (en) * | 2012-07-20 | 2012-11-14 | 安徽江淮电缆集团有限公司 | Shielding type digital symmetrical cable |
| CN103295674A (en) * | 2013-05-16 | 2013-09-11 | 江苏亨通线缆科技有限公司 | Anti-interference composite data cable |
| CN103295674B (en) * | 2013-05-16 | 2016-03-23 | 江苏亨通线缆科技有限公司 | Anti-interference composite data cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20150720 |
|
| EXPY | Termination of patent right or utility model |