CN2550883Y

CN2550883Y - Shield structure of communication cable

Info

Publication number: CN2550883Y
Application number: CN 02217627
Authority: CN
Inventors: 姜正权; 高欢; 栗鸣; 伍小平
Original assignee: Shanghai Secri Optical Cable Co ltd; Shanghai Electric Cable Research Institute
Current assignee: Shanghai Secri Optical Cable Co ltd; Shanghai Electric Cable Research Institute
Priority date: 2002-05-23
Filing date: 2002-05-23
Publication date: 2003-05-14
Anticipated expiration: 2012-05-23

Abstract

The utility model relates to a shield structure of communication cable, which is characterized in that a shielding layer of the communication cable comprises an inner shielding layer, a wrapped fabric tape and an outer shielding layer, wherein, the inner shielding layer is formed by stranded metal wire, and the outer shielding layer wound by high magnetic-inductive steel strip. The utility model has the advantages of high electromagnetic shielding performance, low cost due to the adoption of aluminum wire inner shielding layer, applicability to various cables such as quad, twisted pair, photoelectric combined type, filled and non-filled communication cable, and greatly improved anti-interference capability of communication line.

Description

The shielding construction of the communications cable

Technical field:

The utility model is relevant with the communications cable, particularly a kind of shielding construction of the communications cable of high capability of electromagnetic shielding of anti-strong electromagnetic.

Background technology:

For making the place of the communications cable at anti-strong electromagnetic Capability Requirement; communications cable regular meeting as logical line main lines such as railway, tunnel, subway, light rail, magnetic suspension train and tramcars suffers strong electromagnetic, and therefore this communications cable must have good anti-strong electromagnetic performance.

Fig. 1 is an existing communication cable structure schematic diagram.Cable core is made up of 2 couple shielding broadcast wire 11 at 25 quads and center, the wrapped successively waterstop 9 of cable core, vertical alclad plastic composite strip 8, extrude polyethylene inner sheath 7, wrapped band 6, the wrapped double-deck copper strips 5 in gap, wrapped band 4, vertical Baogang plastic composite strip 3 extrudes fire-retardant oversheath 2.The wrapped double-deck copper strips 5 in its intermediate gap, wrapped band 4 and vertical copper-clad plastic composite strip are screen, employing is put up wrapped with the double-deck copper strips in cross section, both effectively prevented electromagnetic interference, has reduced the outside diameter of cable again.Its shielding factor is 0.63, and this screen is desirable not enough, and the one shielding factor is still waiting to reduce, its two, reach lower shielding factor, though the copper strips shielding is feasible, but the material cost of cable and technology cost are very high.

Summary of the invention:

The technical problems to be solved in the utility model is for further improving the capability of electromagnetic shielding of communications cable screen, and reduces the cost of screen, and a kind of shielding construction of the new communications cable is provided.

Technical solution of the present utility model is as follows:

A kind of shielding construction of the communications cable, be meant the outer electro-magnetic screen layer between inner sheath and fire-retardant oversheath of cable core of the communications cable, be made of internal shield and outer shielding layer, it is characterized in that this internal shield is a metal wire layer, this outer shielding layer is high magnetic conduction steel belt layer.

Also be provided with separator between said metal wire layer and the high magnetic conduction steel belt layer, this separator is wrapped band or extrusion molding layer.

Said metal wire layer can be formed by aluminium wire, copper wire or aluminum bronze mixing skein silk system.

Said metal wire layer is 2 layers of strand system structure.

Said high magnetic conduction steel belt layer is the wrapped structure of multilayer.

Said high magnetic conduction steel belt layer is 2 layers of wrapped structure.

Technique effect of the present utility model is as follows:

1, the utility model has increased the shielding cross-sectional area owing to adopt wire as internal shield, leads thereby improved the shielding electricity, has reached the purpose that reduces shielding factor;

2, particularly adopt aluminium wire strand system, reduced the material cost of screen; Also can be by changing the twisting technology of aluminium wire, stranded density reaches different shielding requirements with the aluminium wire diameter.

3, outer shielding layer adopts high magnetic conduction steel band, has further reduced shielding factor.

Description of drawings:

Fig. 1 is a prior art communications cable structural representation.

Fig. 2 is the utility model embodiment 1 cable structure schematic diagram.

Fig. 3 is the utility model embodiment 2 cable structure schematic diagrames.

Fig. 4 is the utility model embodiment 3 cable structure schematic diagrames.Among the figure:

1-core group 2-oversheath 3-outer shielding layer

The wrapped band of the wrapped band 5-of 4-internal shield 6-

7-extrudes the vertical alclad plastic composite strip of polyethylene inner sheath 8-

The wrapped waterstop 10-of 9-petroleum jelly 11-is to the line group

Embodiment:

Fig. 2 is the utility model embodiment 1 cable structure schematic diagram, its cable structure is as follows: cable core 1 (50 quads), the wrapped successively waterstop 9 of cable core, vertical alclad plastic composite strip 8 extrudes polyethylene inner sheath 7, wrapped fire-retardant band 6, wrapped individual layer copper wire 5, wrapped fire-retardant band 4, the high magnetic conduction steel band 3 of wrapped bilayer extrudes fire-retardant oversheath 2.Wherein: 3,4,5 layers constitute screen.

Fig. 3 is the utility model embodiment 2 cable structure schematic diagrames, and cable structure is as follows:

Cable core 1 (7 quads), the wrapped successively band 9 of cable core, vertical alclad plastic composite strip 8 extrudes polyethylene inner sheath 7, strand system aluminium wire 5, wrapped band 4, the high magnetic conduction steel band 3 of wrapped bilayer extrudes LSOH anti-flaming oversheath 2.Wherein 3,4,5 layers constitute screen.

Fig. 4 is the utility model embodiment 3 cable structure schematic diagrames, and cable structure is as follows:

Cable core 1 (15 quads), the wrapped successively band 9 of cable core, vertical alclad plastic composite strip 8 extrudes polyethylene inner sheath 7, strand system aluminium wire 5, wrapped band 4, wrapped three floor height magnetic conduction steel bands 3 extrude LSOH anti-flaming oversheath 2.Wherein 3,4,5 layers constitute screen.

All through test, its shielding factor reaches 0.22,0.17,0.08 respectively to the foregoing description, adopts the cable coefficient 0.63 of prior art screen that significant reduction has been arranged than Fig. 1.Particularly adopt aluminium wire to make internal shield, can reduce cost greatly, the internal layer screen also is not limited to adopt materials such as aluminium wire, copper wire or aluminum bronze silk union all can adopt certainly.

The utility model shielding layer structure, to the communications cable of any cable core structure,, filled type box-like as quad, twisted pair wire, light resistance, the non-filling type communications cable all are suitable for, and make cable have good capability of electromagnetic shielding.

Claims

1, a kind of shielding construction of the communications cable, be meant the outer electro-magnetic screen layer between inner sheath and oversheath of cable core of the communications cable, be made of internal shield and outer shielding layer, it is characterized in that this internal shield is a metal wire layer, this outer shielding layer is high magnetic conduction steel belt layer.

2, the shielding construction of the communications cable according to claim 1 is characterized in that also being provided with separator between said metal wire layer and high magnetic conduction steel belt layer;

3, the shielding construction of the communications cable according to claim 2 is characterized in that said separator is wrapped band or extrusion molding layer.

4, the shielding construction of the communications cable according to claim 1 and 2 is characterized in that said metal wire layer can be formed by aluminium wire, copper wire or aluminum bronze mixing skein silk system.

5, the shielding construction of the communications cable according to claim 4 is characterized in that said metal wire layer is 2 layers of strand system structure.

6, the shielding construction of the communications cable according to claim 1 and 2 is characterized in that said high magnetic conduction steel belt layer is the wrapped structure of multilayer.

7, the shielding construction of the communications cable according to claim 6 is characterized in that said wrapped high magnetic conduction steel belt layer is 2 layers of wrapped structure.