CN210223653U - Communication cable - Google Patents
Communication cable Download PDFInfo
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- CN210223653U CN210223653U CN201921333373.5U CN201921333373U CN210223653U CN 210223653 U CN210223653 U CN 210223653U CN 201921333373 U CN201921333373 U CN 201921333373U CN 210223653 U CN210223653 U CN 210223653U
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Abstract
The utility model relates to a communication cable, including cable core, shielding layer and restrictive coating. The cable core comprises a plurality of twisted pairs and a polyester tape layer. The twisted pair wires are twisted into a whole, and a filling piece is arranged in a middle gap. The adjacent twisted pairs have different twisting pitches, each twisted pair comprises two insulated wires, and the two insulated wires are twisted into a whole. The polyester belt layer is coated on the outer surfaces of the twisted pairs. The shielding layer includes ground wire and compound aluminium foil layer, compound aluminium foil layer with the restrictive coating is the cladding in proper order from inside to outside the surface of cable core, the ground wire sets up compound aluminium foil layer with between the cable core. The utility model discloses the product can have good signal shielding, excellent high frequency characteristic impedance, practice thrift a great deal of advantages such as installation space.
Description
Technical Field
The utility model relates to the technical field of cables, especially a communication cable.
Background
In recent years, the Chinese rail transit is rapidly developed, Chinese high-speed rails enable the world to feel the Chinese speed, and the technology in the rail transit field also reaches the top-grade level of the world. With the rapid development of urban subways, light rails, high-speed railways, standard motor train units and the like at home and abroad, the demand of cables for rolling stock is increasing day by day. The 5G era is coming, the updating of communication cables is trending, and the video transmission requirement of rail transit is increasing.
At present, the traditional communication cable has poor applicability in the field of rail transit due to the reasons of materials, structures, performances and the like.
The conventional video transmission cable has the following disadvantages:
1. most of cable materials are halogen materials and are not flame-retardant, and the cable materials can not meet the requirements of cables for rail transit.
2. Most of video cables are single-core coaxial cables, and the twisted pair electromagnetic shielding effect is common.
3. The cable is only used in a low frequency band, and the characteristic impedance of the high frequency band cable is poor.
4. When a plurality of cables are used, the occupied space is large, and the installation and the operation are inconvenient.
Conventional video transmission cables are generally used only at low frequency bands; most of the traditional video transmission cables are coaxial cables, and the traditional video transmission cables have the advantages that the shielding effect is good, but when a plurality of groups of video signals are required to be transmitted, the number of cables and connectors can be increased; the space occupancy rate of the twisted wire with a simple structure is relatively lower than that of a coaxial cable, but the shielding effect is poor; none of these conventional cables is the best option for locomotives with tight shielding requirements due to the narrow installation space.
SUMMERY OF THE UTILITY MODEL
The invention of the utility model aims to: there is traditional video transmission cable to prior art and is mostly coaxial cable, can only be through increasing cable root and connector during the transmission of multiunit video signal, especially to the narrow condition of track traffic installation space, occupation space is big, the relatively poor scheduling problem of traditional video transmission cable high frequency characteristic impedance, provides a communication cable for track traffic, and this cable has excellent high frequency section cable characteristic impedance, practices thrift installation space, good shielding effect a great deal of advantage.
In order to realize the purpose, the utility model discloses a technical scheme be:
a communication cable comprises a cable core, a shielding layer and a sheath layer.
The cable core comprises a plurality of twisted pairs and polyester tape layers.
The twisted pair wires are twisted into a whole, and a filling piece is arranged in a middle gap.
The twisting pitches of the adjacent twisted pairs are different.
Each twisted pair comprises two insulated wires which are twisted into a whole.
The polyester belt layer is coated on the pair of twisted wires which are twisted into a whole.
The shielding layer includes ground wire and compound aluminium foil layer, compound aluminium foil layer with the restrictive coating is the cladding in proper order from inside to outside the surface of cable core, the ground wire sets up compound aluminium foil layer with between the cable core.
Compared with the traditional video transmission cable which is mostly coaxial cable, the communication cable of the utility model adopts the twisted pair wire design, and has the advantages of simple structure and small occupied space; the pitches of adjacent twisted pairs are different, so that the anti-interference effect is formed between the twisted pairs, and the high-frequency characteristic impedance is excellent; the design that the filling pieces and the polyester tape layers are arranged among the twisted pairs is adopted, so that the roundness of the cable core is ensured, and the pitch is more stable; the shielding mode of the ground wire and the aluminum foil can achieve good shielding effect.
As the preferred scheme of the utility model, a plurality of the whole stranding of pair stranded conductor is to with two the stranding of insulated wire is to keeping unanimous.
As a preferable aspect of the present invention, the filling member is a filling rope.
As the utility model discloses an optimal selection scheme constitutes two of same pair stranded conductor the different of insulated wire colour, the different colours are convenient for cable insulated wire's discernment installation and inspection.
As a preferred embodiment of the present invention, the insulated wire includes a conductor and an insulating layer, and the insulating layer covers the outer surface of the conductor.
Further, the conductor is bare copper wire or tinned wire or silver-plated wire.
Preferably, the conductor is a tinned annealed copper wire, which may increase the overall softness of the cable.
Further, the cross-sectional area of the conductor is 0.2mm2To 0.75mm2The flexibility of the whole cable is improved, and the bending radius of the cable is increased.
Further, the thickness of the insulating layer is 0.18mm to 0.3 mm.
As a preferable embodiment of the present invention, the tower jointing rate of the polyester tape layer and the composite aluminum foil layer is less than 45% and greater than or equal to 25%.
As the utility model discloses a preferred scheme, communication cable is applied to the look screen transmission cable of track locomotive.
Still exist cable material in prior art mostly have steamed material and be fire-retardant, unsatisfied track traffic cable requirement's problem, the utility model discloses a following technical scheme:
as the preferred scheme of the utility model, the restrictive coating is the lamellar structure who adopts the material that satisfies standard EN50264-1:2008 requirement, and this material both can satisfy low smoke and zero halogen flame retardant material requirement, also can improve the holistic compliance of cable.
The stranding pitch refers to the distance that a single wire advances along the axis of a stranded wire by one rotation.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a cable conductor is made to a plurality of stranded conductor stranding mode as an organic whole, has saved installation space, conveniently lays the installation.
2. The utility model discloses the pitch is different between every group stranded conductor, not only can reach interference killing feature and excellent characteristic impedance between the pair line, can guarantee roundness, the structural stability of cable core moreover.
3. The utility model discloses add the filling member in the cable conductor gap, can make roundness, pitch stability and the superior bending property of guaranteeing the cable core.
4. The utility model discloses select for use polyester tape to wrap a plurality of twisted pairs, the polyester tape has the effect of restrainting, can be so that cable structure is compact, strengthens holistic stability.
5. The utility model discloses preferred scheme adopts tin-plating annealing annealed soft copper line preparation conductor, and the conductor sectional area is at 0.2mm2To 0.75mm2The flexibility of the cable can be enhanced, the bending radius can reach 4 times of the outer diameter of the cable, and the installation and the laying are convenient.
6. The utility model discloses a good shielding effect can be reached to the shielding mode of ground wire + aluminium foil to it is better than the compliance of braided shield, helps the bending of cable.
7. The utility model discloses the preferred scheme adopts the sheath material that satisfies standard EN50264-1:2008 requirement, has not only satisfied the low smoke and zero halogen fire-retardant requirement of cable for the track traffic, can improve the high temperature resistance ability of cable, ensures the safety in utilization of cable; and the typical value of the Shore A hardness of the material is 80 +/-2, so that the flexibility of the cable can be ensured, and the cable can be conveniently installed and laid subsequently.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a characteristic impedance diagram of a cable.
The labels in the figure are: 1-conductor, 2-insulating layer, 3-polyester tape layer, 4-ground wire, 5-filling piece, 6-composite aluminum foil layer and 7-sheath layer.
Detailed Description
The present invention will be described in detail with reference to fig. 1 and 2.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 1, the utility model discloses a communication cable, including cable core, shielding layer and restrictive coating 7.
The cable core comprises a plurality of twisted pairs and a polyester tape layer 3. A plurality of the twisted pair lines are twisted into a whole, the twisted pair line design is adopted, the advantages of simple structure and small occupied space are achieved, the adjacent twisted pair lines are provided with different pitches, and therefore anti-interference is achieved between the twisted pair lines, and excellent high-frequency characteristic impedance is achieved. Be provided with filler 5 in the middle gap, guarantee the circularity of cable core to it is more stable to make the pitch. Each twisted pair comprises two insulated wires, and the polyester tape layer 3 covers the outer surfaces of the twisted pairs. The shielding layer includes ground wire 4 and compound aluminium foil layer 6, and this kind of shielding is effectual, compound aluminium foil layer 6 and restrictive coating 7 from inside to outside in proper order the cladding at the surface of cable core, the ground wire sets up between compound aluminium foil layer 6 and cable core.
Example 2
As shown in FIG. 1, a communication cable is prepared by first preparing two conductors 1 having a cross-sectional area of 0.2mm on a drawing machine2The precision of the finished product die of the wire drawing machine of the tinned annealed copper wire must reach the nominal diameter +/-0.0005 mm of the die, so that the diameter of a single wire of the drawn wire is ensured to meet the technological requirements.
The insulating layer 2 is coated on the outer surface of the conductor 1 to manufacture the insulating wire, the insulating layer 2 is made of polyethylene material, the insulating material is dried before extrusion molding, the drying temperature is 90 ℃, the time is 3 hours, the processing temperature of the insulating material is 220 ℃, the insulating thickness must meet the process requirement of 0.22mm, and the concentricity of the insulating wire must be ensured to be more than 0.8. During insulation production, the conductor needs to be preheated, otherwise, insulation retraction, unqualified insulation elongation rate and the like can occur.
And twisting the two insulated wire harnesses into a whole to prepare the twisted pair.
Preparing 9 twisted pairs, twisting the 9 twisted pairs into a whole, arranging different twisting pitches for each twisted pair, tightly surrounding 8 twisted pairs at the periphery of the twisted pairs according to the middle 1 twisted pair, and adding a filling rope into the gap of the middle twisted pair, wherein the pitch error must be ensured within the range of +/-3 mm of the set pitch. The twisting direction of two insulated wires forming the same twisted wire pair is consistent with that of 9 twisted wire pairs, and the pitch change is caused by the different twisting directions of the two insulated wires. The arrangement of the positions of the twisted wires and the arrangement of the cabling pitches can ensure the roundness, the structural stability and the superior bending performance of the cable core, and the unique arrangement mode can achieve the anti-interference effect and the excellent characteristic impedance between the twisted wires.
After the 9 twisted pairs are wrapped with the polyester tape layer 3, the ground wire 4 needs to be twisted, and the single-side composite aluminum foil layer 6 is wrapped again, and the single-side composite aluminum foil layer 6 needs to face inwards. The sufficient overlapping rate can ensure the bending of the cable and the sufficient shielding, but the excessive overlapping rate can cause waste and affect the negative effect of the bending of the cable, therefore, the overlapping rate of the polyester tape layer 3 and the composite aluminum foil layer 6 must be more than or equal to 25 percent, but not more than 45 percent. The shielding mode of the ground wire 4+ the composite aluminum foil layer 6 can achieve a good shielding effect, is better than the flexibility of a braided shield, and is beneficial to bending of a cable.
The sheath layer 7 is made of a low-smoke halogen-free flame-retardant material, the performance of the material meets the relevant requirements of the standard EN50264-1:2008, the Shore A typical value of the material is 80 +/-2, the requirements of cables for rail transit are met, the flexibility of the cables is guaranteed, and the cables are convenient to install and lay subsequently.
This example designs a 9X 2X 0.2mm2The characteristic impedance of the cable, the characteristic impedance of each pair of lines, is not more than 100 Ω + -10 Ω at 4-100 MHz, wherein the characteristic impedance of the cable is not more than 100 Ω + -5 Ω at 20MHz, as can be seen from FIG. 2. The 9-pair wire design of the cable belongs to the first category in video transmission cables, and the cable can normally work in a working environment at the temperature of-25-85 ℃.
It is from top to bottom visible, adopt the utility model discloses a video transmission cable for track traffic has low smoke and zero halogen flame retardant property, good signal shielding, excellent high frequency characteristic impedance, bending property are good, practice thrift installation space etc. a great deal of a bit.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A communication cable is characterized by comprising a cable core, a shielding layer and a sheath layer (7);
the cable core comprises a plurality of twisted pairs and a polyester tape layer (3);
a plurality of twisted wires are twisted into a whole, and a filling piece (5) is arranged in a middle gap;
the twisting pitches of the adjacent twisted pairs are different;
each twisted pair comprises two insulated wires;
the two insulated wires are twisted into a whole;
the polyester belt layer (3) is coated on the twisted pairs which are twisted into a whole;
the shielding layer includes ground wire (4) and compound aluminium foil layer (6), compound aluminium foil layer (6) with restrictive coating (7) from inside to outside in proper order the cladding be in the surface of cable core, ground wire (4) set up compound aluminium foil layer (6) with between the cable core.
2. The communication cable of claim 1, wherein the plurality of twisted pairs are integrally cabled in a direction corresponding to the direction of the two insulated wires.
3. The communication cable according to claim 1, wherein the filler element (5) is a filler rope.
4. The communication cable of claim 1, wherein the two insulated wires comprising the same twisted pair are different colors.
5. The communication cable according to claim 1, wherein the insulated wire comprises a conductor (1) and an insulating layer (2), and the insulating layer (2) covers the outer surface of the conductor (1).
6. The communication cable according to claim 5, wherein the cross-sectional area of the conductor (1) is 0.2mm2To 0.75mm2The thickness of the insulating layer (2) is 0.18mm to 0.3 mm.
7. The communication cable according to claim 5, wherein the conductor (1) is a bare copper wire or a tinned wire or a silvered wire.
8. The communication cable according to claim 1, characterized in that the lap ratio of the polyester tape layer (3) and the composite aluminium foil layer (6) is less than 45% and greater than or equal to 25%.
9. The communication cable according to claim 1, wherein the sheath layer (7) is a layered structure made of a low-smoke halogen-free flame-retardant material meeting the requirements of standard EN50264-1: 2008.
10. The communication cable according to any one of claims 1 to 9, wherein the communication cable is applied to a video transmission cable of a rail locomotive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921333373.5U CN210223653U (en) | 2019-08-16 | 2019-08-16 | Communication cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921333373.5U CN210223653U (en) | 2019-08-16 | 2019-08-16 | Communication cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210223653U true CN210223653U (en) | 2020-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921333373.5U Active CN210223653U (en) | 2019-08-16 | 2019-08-16 | Communication cable |
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| CN (1) | CN210223653U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113643852A (en) * | 2021-08-04 | 2021-11-12 | 江西伊发电线电缆有限公司 | Anti-interference 5G environment-friendly cable and preparation method thereof |
-
2019
- 2019-08-16 CN CN201921333373.5U patent/CN210223653U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113643852A (en) * | 2021-08-04 | 2021-11-12 | 江西伊发电线电缆有限公司 | Anti-interference 5G environment-friendly cable and preparation method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 610000 new route 18, high tech Zone (West District), Chengdu, Sichuan Province Patentee after: Chengdu Siwei Technology Co.,Ltd. Patentee after: CHENGDU ZHONGLING RADIO COMMUNICATIONS Co.,Ltd. Address before: No. 18, Xinhang Road, High-tech Zone (West Area), Chengdu, Sichuan 611731 Patentee before: CHENGDU PUTIAN TELECOMMUNICATIONS CABLE CO.,LTD. Patentee before: CHENGDU ZHONGLING RADIO COMMUNICATIONS Co.,Ltd. |
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| CP03 | Change of name, title or address |