CN201112006Y

CN201112006Y - High shielding cable television cable

Info

Publication number: CN201112006Y
Application number: CNU2007200575502U
Authority: CN
Inventors: 陈伟乐; 肖翠玉; 陈占山
Original assignee: ZHUHAI YUXUN COAXIAL CABLE CO Ltd
Current assignee: ZHUHAI YUXUN COAXIAL CABLE CO Ltd
Priority date: 2007-09-27
Filing date: 2007-09-27
Publication date: 2008-09-10
Anticipated expiration: 2017-09-27

Abstract

The utility model discloses a high shielding cable for a cable television. The cable aims at providing a high frequency cable of a cable television, with high shielding property and broader transmission bandwidth. The cable comprises an inner conductor (1), an insulation layer (2), an outer conductor and a sheath (5), and the inner conductor (1), the insulation layer (2), the outer conductor and the sheath (5) are coaxially arranged from the inside to the outside in sequence. The outer conductor is composed of a braiding layer (3) and an aluminum plastic composite tape (4) coating the braiding layer (3); the aluminum plastic composite tape (4) is composed of an aluminum-based layer (41) and a plastic layer (42). The aluminum-based layer (41) is closely contacted with the external surface of the braiding layer (3), and the plastic layer (42) is closely adhered to the internal surface of the sheath (5). The high shielding cable for a cable television can be applied in the transmission of video and audio signals of the cable television.

Description

High shielding cable of cable TV

Technical field

The utility model relates to a kind of high shielding cable of cable TV.

Background technology

In cable TV network, the cable of cable TV that is used for the audio-video signal transmission generally is mainly to be made up of inner wire, insulating barrier, outer conductor and sheath: inner wire is the carrier of information such as transmission cable TV simulation signal, digital signal; Outer conductor also claims screen, and its effect is the loop that is made of the signal of telecommunication internal and external conductor, guarantees that the signal of telecommunication transmits in outer conductor, and transmission signals is not revealed, and also makes the external electromagnetic signal can not invade outer conductor inside, thereby has prevented external interference; And the effect of insulating barrier is with the internal and external conductor insulation separately, makes internal and external conductor can constitute signal of telecommunication loop; Sheath is the outermost layer of cable; cable is played comprehensive protective effect; as moistureproof, prevent ageing of insulation, anti-slight mechanical damage etc., also can make some marks and sign on its outer surface, as manufacturer's title, product type, specification, metering or product user title etc.At present, electronic information technology improves constantly, requirement to the bandwidth of cable of cable TV transmission, degree of screening, attenuation constant index also improves constantly, and cable of cable TV of the prior art, mostly its outer conductor is aluminum plastic film+metal wire knitted outer conductor or independent metal wire knitted outer conductor, its degree of screening is lower, and the bandwidth of institute's transmission signals is wide inadequately, does not satisfy user's instructions for use.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of degree of screening height, the wideer high frequency cable of cable TV of transmission band are provided.

The technical scheme that the utility model adopted is: the utility model comprises inner wire, insulating barrier, outer conductor, sheath, the coaxial from inside to outside successively setting of described inner wire, described insulating barrier, described outer conductor, described sheath, described outer conductor is made up of the braid aluminium-plastic tape outer with being coated on described braid, described aluminium-plastic tape is made up of aluminum base layer and plastic layer, described aluminum base layer and described braid outer surface be close contact mutually, and described plastic layer tight bond is at described jacket inner surface.

Described aluminium-plastic tape is overlapping to be put up in described braid outer surface, and its Duplication is greater than 25%.

The thickness of described aluminum base layer is greater than 0.15mm.

Described insulating barrier can be made up of the interior thin layer, the foaming layer that are bonded as one, and described interior thin layer tight adhesion is on described inner wire surface.

Described insulating barrier also can be made up of the interior thin layer that is bonded as one successively, foaming layer, outer thin layer, and described interior thin layer tight adhesion is on described inner wire surface.

The beneficial effects of the utility model are: because outer conductor of the present utility model is made up of the braid aluminium-plastic tape outer with being coated on described braid, described aluminium-plastic tape is made up of aluminum base layer and plastic layer, described aluminum base layer and described braid outer surface be close contact mutually, described plastic layer tight bond is at described jacket inner surface, so can improve the shield effectiveness and the anti-electromagnetic interference capability of outer conductor, strengthened degree of screening, make degree of screening can reach 100%, the attenuation constant index that has reduced, make cable can transmit more wide band signal, satisfied user's instructions for use; Because insulating barrier of the present utility model is made up of the interior thin layer+foaming layer that is bonded as one or interior thin layer+foaming layer+outer thin layer, can effectively prevent entering of moisture and moisture, so improved the waterproof and dampproof performance of cable, made the transmission performance of cable more stable, longer service life.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the longitudinal profile schematic diagram of the utility model embodiment one;

Fig. 3 is the longitudinal profile schematic diagram of the utility model embodiment two.

Embodiment

Embodiment one:

As shown in Figure 1 and Figure 2, the utility model comprises inner wire 1, insulating barrier 2, outer conductor, sheath 5, the coaxial from inside to outside successively setting of described inner wire 1, described insulating barrier 2, described outer conductor, described sheath 5.

Inner wire 1 is the flawless rounding conductor of size uniformity, smooth in appearance, is the analog signal in the transmission cable TV network, the carrier of audio-video signal, Digital Television, digital information symbols, and transmission frequency bandwidth can reach 3GHz.

Insulating barrier 2 is made up of interior thin layer 21, foaming layer 22: interior thin layer 21 is to extrude one deck polyolefin material evenly to mix the solid viscosity heat insulating lamina that is extruded in outside the inner wire with sizing outside inner wire 1, this thin layer can closely adhere to each other with inner wire, can stop moisture moisture to enter effectively, prevent the inner wire oxidation stain and influence its transmission performance, also can peel off simultaneously and be beneficial to continued access; Foaming layer 22 is after the high expanded polyolefin material of physics and nucleator are mixed by optimal proportion, add in the physics bubble extruder occurred frequently, the nitrogen that in extruder, adds stable chemical performance, rotatablely move through screw rod and to become compression with fused polyolefin mixture and nitrogen are mixing, the foaming body of uniform and smooth, extrude the back and form the foamed insulation body, and with interior thin layer 21 bonding becoming one, this foaming layer is the foaming structure high conformity not only, and smooth in appearance rounding, this insulating barrier dielectric constant is little, dielectric loss value is low, so good electric property and transmission performance are arranged in high-frequency transmission.

Outer conductor also claims screen, and its effect is the loop that is made of the signal of telecommunication internal and external conductor, guarantees that the signal of telecommunication transmits in outer conductor, and transmission signals is not revealed, and also makes the external electromagnetic signal can not invade outer conductor inside, thereby has prevented external interference.Outer conductor is made up of braid 3 and the aluminium-plastic tapes 4 that are coated on outside the described braid 3, described aluminium-plastic tape 4 is made up of aluminum base layer 41 and plastic layer 42 that thickness is not less than 0.15mm, described aluminium-plastic tape 4 adopts vertical bag or wrapped overlapping the putting up in described braid 3 outer surfaces of mode, its Duplication is greater than 25%, wherein said aluminum base layer 41 and described braid 3 outer surfaces are close contact mutually, described plastic layer 42 contacts with sheath 5, and described plastic layer 42 is plastic sheets of being made by the mixture of EAA (or EMA) and PE.The degree of screening of described outer conductor can reach 100%, and can make cable compare common cable of cable TV and have better performance: structure is more stable; Can reduce by 5% signal attenuation, prolong the high-frequency band signals transmission range, save the gain facility, reduce line cost; Humidity resistance is more excellent, can reach 100%; The impedance deviation range is littler; Signal transmission bandwidth is wideer; More help Digital Television, digital information transmission.

Sheath 5 is outermost layers of cable; cable is played comprehensive protective effect; as moistureproof, prevent ageing of insulation, anti-slight mechanical damage etc.; also can make some marks and sign on its outer surface; as manufacturer's title, product type, specification, metering or product user title etc., described sheath 5 can be a pe sheath, also can be pvc sheath; can also make two sheaths or low smoke and zero halogen sheath according to specific (special) requirements, present embodiment adopts pvc sheath.

Embodiment two:

As Fig. 1, Fig. 3 present embodiment is to increase thin layer 23 outside again in foaming layer 22, this layer is the solid polyethylene insulation thin layer of one deck, the general employing with 22 while of foaming layer co-extrusion becomes one two-layer bonding, thereby make insulating barrier 2 dimensional structures more stable, can be more effective waterproof and dampproof, and help half-finished keeping, and the transmission performance of finished product is improved, the life-span prolongs.Can also produce as requested coloured outer thin layer or outside the thin layer surface adorn out sign, help false proof, prevent to be falsely used replacement, be beneficial to the manufacturer that the user confirms product.Remainder is with embodiment one.

Claims

1, a kind of high shielding cable of cable TV, comprise inner wire (1), insulating barrier (2), outer conductor, sheath (5), described inner wire (1), described insulating barrier (2), described outer conductor, the coaxial from inside to outside successively setting of described sheath (5), it is characterized in that: described outer conductor is by braid (3) and be coated on the outer aluminium-plastic tape (4) of described braid (3) and form, described aluminium-plastic tape (4) is made up of aluminum base layer (41) and plastic layer (42), described aluminum base layer (41) and described braid (3) outer surface be close contact mutually, and described plastic layer (42) tight bond is at described sheath (5) inner surface.

2, high shielding cable of cable TV according to claim 1, it is characterized in that: described aluminium-plastic tape (4) is overlapping to be put up in described braid (3) outer surface, and its Duplication is greater than 25%.

3, high shielding cable of cable TV according to claim 1 and 2, it is characterized in that: the thickness of described aluminum base layer (41) is greater than 0.15mm.

4, high shielding cable of cable TV according to claim 3, it is characterized in that: described insulating barrier (2) is made up of the interior thin layer (21) that is bonded as one, foaming layer (22), and described interior thin layer (21) tight adhesion is on described inner wire (1) surface.

5, high shielding cable of cable TV according to claim 3, it is characterized in that: described insulating barrier (2) is made up of the interior thin layer (21) that is bonded as one successively, foaming layer (22), outer thin layer (23), and described interior thin layer (21) tight adhesion is on described inner wire (1) surface.