CN208970218U - High-frequency digital communication cable - Google Patents

Abstract

The utility model discloses a kind of high-frequency digital communication cables, and including the cable core constituted to line group by four Duis, each pair of pair of line group is mutually twisted by two insulation core wires；It is coated with shielded layer on cable core, outer jacket is coated on the shielded layer, the insulation core wire includes cored wire conductor, is successively coated with silica gel internal layer, froth bed, silica gel outer layer and film layer inside-out on cored wire conductor.The silica gel internal layer and silica gel outer layer are formed by room temperature Silicone Rubber Coated.The film layer be PET film, the film layer with a thickness of 4 μm -6 μm.The high-frequency digital communication cable, erosion of the harmful chemical component to insulation core wire insulating layer can not only effectively be blocked, avoid the variation of insulator dielectric constant, and the adhesive force between cored wire conductor and insulating layer is high, it is firm that conductor physical location is stablized, especially suitable for ultra-high frequency digital data transmission cable.

Description

High-frequency digital communication cable

Technical field

The utility model relates to cable for digital communication more particularly to a kind of communications that can transmit high frequency, high-speed digital signal Cable.

Background technique

As digital communications network is constantly to large capacity, high-frequency, the development of high-speed longitudinal direction, cable for digital communication It need to develop from seven classes to the communication cable product of eight classes and superelevation transmission frequency.Existing cable for digital communication is mostly thoroughly done away with by eight Edge core wire is twisted into four pairs to line group two-by-two, then finally squeezes into oversheath to line group twisted synthesizing cable by this four pairs and finished product is made Cable.

Skin/three-layer insulated structure of bubble/skin, in fact intracardiac, exodermis are mostly used to the insulating layer of line group insulation core wire Between have many close and mutual disconnected foam hole froth bed, its dielectric constant greatly decline than solid skin insulating layer, Thus the insulation layer structure makes communication cable have the preferable technical performance for transmitting high-frequency digital signal.But when with using Between continuous extension, the chemical component from the cable external world and the plasticizer and solvent that are present in cable cover(ing) can gradually Or unexpectedly shift and to insulated single wire shielded layer corrode, especially when cable is in the chemical contamination of the complexity such as soda acid Environment in when, these harmful chemical components can not only form cable insulation single line and corrode, but also can corrode and change The insulating layer material performance and insulator dielectric constant of insulated single wire, to change the impedance behavior of communication cable, not only directly Influence the transmission performance of cable for digital communication, it is difficult to guarantee that the high-frequency steady in a long-term of communication cable digital signal, high speed pass It is defeated, or even seriously affect the safe and reliable transmission of digital signal.

The metallic conductor of insulation core wire and solid endodermis are due to being that different materials are constituted simultaneously, and solid endodermis is in metal Adhesive force on conductor is insufficient, so that three-layer insulated structure is easy the vibration on conductor and shifts, and makes to two in line group The relative position of metallic conductor is subjected to displacement or changes, and then causes to lead to the construction of cable to the change of line group structural parameters It is unstable, influence the raising of high-frequency digital communication cable working frequency and data transmission bauds.

Utility model content

For above-mentioned deficiency present in the prior art, the technical problem to be solved by the utility model is to provide a kind of high Frequency cable for digital communication can not only effectively block erosion of the harmful chemical component to insulation core wire insulating layer.Insulator is avoided to be situated between The variation of electric constant, and the adhesive force between cored wire conductor and insulating layer is high, and it is firm that conductor physical location is stablized.

In order to solve the above-mentioned technical problem, the high-frequency digital communication cable of the utility model, including by four pairs to line group structure At cable core, each pair of pair of line group be mutually twisted by two insulation core wires；Shielded layer is coated on cable core, in the shielding It is coated with outer jacket on layer, the insulation core wire includes cored wire conductor, is successively coated with silica gel inside-out on cored wire conductor Internal layer, froth bed, silica gel outer layer and film layer.

In said structure, since the cored wire conductor in insulation core wire is coated with silica gel internal layer, froth bed, silica gel outer layer And film layer, to constitute four layers of insulation system of core wire.Its silica gel internal layer makes the insulation system layer outside conductor closely firm Admittedly be adhered on conductor, to guarantee to stablize two cored wire conductor relative positions of line group, though cable in laying drawing or Torsion also ensures that insulation core wire relative position is not subjected to displacement and changes.Froth bed in insulating layer makes the work between core wire electric Appearance declines to a great extent, to make the reduction of line transmission attenuation constant, high frequency performance is good.It is set to the outermost film of insulation core wire Layer, can effectively block oversheath plasticizer and intrusion from environment harmful chemical to core insulation and transfer, guarantee The stabilizations of insulating dielectric constants.The silica gel outer layer being set between outer membrane layer and froth bed, not only ensure that foam The air-tightness and stability of layer micro-bubble, and ensure that the adhesion strength of film layer and froth bed, especially silica gel internal layer and Silica gel outer layer is located inside and outside froth bed, and froth bed is made to constitute strict confining bed, and foam is big at the gentle hole of cell size It is small to remain unchanged always, it is ensured that the stabilization of insulating dielectric constants.Therefore, four layers of core insulation knots in the utility model Structure ensure that immobilizing for cored wire conductor mutual alignment, so that the stabilization of insulating dielectric constants, so that communication cable With ideal input impedance, interconductor capacitance and pad value, it is ensured that signal of communication high speed, high frequency, safe and reliable transmission.

Preferred embodiments of the present invention, the silica gel internal layer and silica gel outer layer are formed by room temperature Silicone Rubber Coated. Good bonding agent effect can be played at room temperature, it is easy to process.

Preferred embodiments of the present invention, the film layer be PET film, the film layer with a thickness of 4 μm -6 μ m.Using PET film, there is excellent physics, chemical property and good air-tightness and chemical resistance.

The utility model further embodiment, the shielded layer are foil shielded layer or woven shield.The outer shield Layer is that low smoke halogen-free flame-retardant polyolefin extrudes layer.Aerial drainage line is provided between the shielded layer and outer jacket.

Detailed description of the invention

The utility model high-frequency digital communication cable is made further specifically with reference to the accompanying drawings and detailed description It is bright.

Fig. 1 is the cross section structure schematic diagram of the utility model high-frequency digital communication cable specific embodiment；

Fig. 2 is the cross section structure schematic diagram of the insulation core wire in Fig. 1 illustrated embodiment.

In figure, 1-cored wire conductor, 2-silica gel internal layers, 3-froth beds, 4-silica gel outer layers, 5-film layers, 6-shieldings Layer, 7-outer shields, 8-aerial drainage lines.

Specific embodiment

The cable core of high-frequency digital communication cable as shown in Figure 1, the cable is twisted line group by four pairs, and cable core is twisted 65 ㎜ of pitch；Every a pair of line group is mutually twisted by two insulation core wires, and insulation core wire is led by cored wire conductor 1 and being coated on Insulating layer of conductor on body is constituted.Shielded layer 6 is coated on cable core, which is also possible to aluminum foil screen Shield tape or proof copper-wire braided shielded layer.Outer jacket 7 is extruded on shielded layer 6, outer jacket 7 is that low-smoke non-halogen flame-retardant polyolefin extrudes Layer, is provided with an aerial drainage line 8 between shielded layer 6 and outer jacket 7, and aerial drainage line 8 is 0.5 ㎜ tinned wird of diameter, aerial drainage line 8 It is arranged longitudinally along the cable.

As shown in Fig. 2, the cored wire conductor 1 of insulation core wire is the copper wire of 0.58 ㎜ of diameter, the elongation control of conductor exists Between 24% -26.5%, the insulating layer on conductor includes silica gel internal layer 2, froth bed 3, silica gel outer layer 4 and film layer 5.Silica gel Internal layer 2 between conductive surface and froth bed, silica gel internal layer 2 with a thickness of 5 μm, froth bed 3 with a thickness of 70 μm, the foam Layer 3 is material by chemically or physically foaming using mixed high density polyethylene (HDPE).Positioned at core insulation outmost surface The material of film layer 5 be high-temperature polyester film (PET film), with a thickness of 5 μm, coated between film layer 5 and froth bed 3 and The silica gel outer layer 4 of formation with a thickness of 5 μm.Silica gel internal layer 2 and silica gel outer layer 4 are formed by room temperature Silicone Rubber Coated.

Claims (6)

1. a kind of high-frequency digital communication cable, including the cable core constituted to line group by four Duis, each pair of pair of line group thoroughly does away with edge by two Core wire is mutually twisted；It is coated with shielded layer (6) on cable core, is coated with outer jacket (7) on the shielded layer (6), it is special Sign is: the insulation core wire includes cored wire conductor (1), is successively coated with silica gel internal layer inside-out on cored wire conductor (1) (2), froth bed (3), silica gel outer layer (4) and film layer (5).

2. high-frequency digital communication cable according to claim 1, it is characterised in that: outside the silica gel internal layer (2) and silica gel Layer (4) is formed by room temperature Silicone Rubber Coated.

3. high-frequency digital communication cable according to claim 1, it is characterised in that: the film layer (5) is PET film, The film layer (5) with a thickness of 4 μm -6 μm.

4. high-frequency digital communication cable according to claim 1, it is characterised in that: the shielded layer (6) is foil shielding Layer or woven shield.

5. high-frequency digital communication cable according to claim 1, it is characterised in that: the outer jacket (7) is low smoke and zero halogen Fire retardant polyolefin extrudes layer.

6. high-frequency digital communication cable according to claim 1, it is characterised in that: the shielded layer (6) and outer jacket (7) Between be provided with aerial drainage line (8).