CN215815358U

CN215815358U - Composite shielding coaxial cable

Info

Publication number: CN215815358U
Application number: CN202122266176.XU
Authority: CN
Inventors: 杨林臻; 邹明; 丁博
Original assignee: Hunan Valin Wire and Cable Co Ltd
Current assignee: Hunan Valin Wire and Cable Co Ltd
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2022-02-11
Anticipated expiration: 2031-09-17

Abstract

The utility model discloses a composite shielding coaxial cable, which comprises a conductor, and an insulating layer, a composite shielding layer and a sheath which are sequentially wrapped outside the conductor from inside to outside, wherein the composite shielding layer is formed by combining a first shielding layer, a second shielding layer, a third shielding layer and a fourth shielding layer from inside to outside, the first shielding layer is formed by spirally wrapping a silver-plated copper flat tape, the second shielding layer and the fourth shielding layer are respectively woven by silver-plated round copper wires, and the third shielding layer is formed by wrapping a double-sided copper-plastic composite tape.

Description

Composite shielding coaxial cable

Technical Field

The utility model relates to the technical field of coaxial cables, in particular to a composite shielding coaxial cable.

Background

At present, the following situations exist in common coaxial cables: 1. the common product adopts a bare copper wire as a conductor, is not high-temperature resistant and is easy to oxidize; 2. the common product adopts polyethylene material as insulation, and the dielectric constant of the insulation material is large, so that the attenuation of the product is large, and the transmission capability of the product is reduced; 3. a common product adopts a layer of tinned copper wire woven as a shielding layer, and can only resist external low-frequency interference and cannot resist external high-frequency interference.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art and provides a composite shielding coaxial cable.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a composite shielded coaxial cable comprises a conductor, and an insulating layer, a composite shielding layer and a sheath which are sequentially wrapped outside the conductor from inside to outside.

Preferably, the conductor is made of silver-plated copper wires, is not easy to oxidize, and can resist the temperature of 200 ℃ for a long time, and the high-temperature resistance performance is good.

Preferably, the insulating layer is formed by stitching and wrapping polytetrafluoroethylene films, so that the weight of the cable is reduced, transmission attenuation is reduced, and the impedance of the cable can be matched with that of equipment (the nominal characteristic impedance of the equipment is 50 omega).

Furthermore, the composite shielding layer is formed by combining a first shielding layer, a second shielding layer, a third shielding layer and a fourth shielding layer from inside to outside. Specifically, the first shielding layer is formed by spirally winding a silver-plated copper flat belt, the second shielding layer and the fourth shielding layer are formed by weaving silver-plated round copper wires, the third shielding layer is formed by winding a double-sided copper-plastic composite belt, and a composite shielding structure is adopted, so that the product can resist external low-frequency interference, can resist external high-frequency interference, and ensures that a transmission signal is complete and undistorted.

Preferably, the material of the sheath is fluorinated ethylene propylene.

Compared with the prior art, the utility model has the beneficial effects that:

1. the conductor of the composite shielding coaxial cable is a silver-plated copper wire, is not easy to oxidize and has good high-temperature resistance;

2. the composite shielding coaxial cable adopts the microporous polytetrafluoroethylene film with low dielectric constant (about 1.4), high and low temperature resistance and light density, and the dielectric constant of the insulating material is low, so that the weight of the cable is reduced, the transmission attenuation is reduced, and the transmission capability of the cable is improved;

3. the composite shielding coaxial cable adopts a composite shielding structure, so that the product can resist external low-frequency interference and external high-frequency interference, and transmission signals are complete and undistorted.

Drawings

Fig. 1 is a schematic structural diagram of the composite shielded coaxial cable.

In the figure: 1. a conductor; 2. an insulating layer; 3. a shielding layer; 4. a sheath; 31. a first shielding layer; 32. a second shielding layer; 33. a third shielding layer; 34. and a fourth shielding layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1, the composite shielded coaxial cable includes a conductor 1, and an insulating layer 2, a composite shielding layer 3 and a sheath 4 sequentially wrapped outside the conductor 1 from inside to outside.

In this embodiment, 1 solid silver-plated copper wire with a nominal diameter of 1.40mm is used as the conductor 1.

In the embodiment, the insulating layer 2 is formed by butt-seam lapping of a white microporous polytetrafluoroethylene film with the dielectric constant of 1.4, the density of 0.7g/cm3, the width tolerance of +/-0.1 mm and the thickness tolerance of +/-10%, the lapping overlapping rate is 45% -50%, and the outer diameter after lapping is 3.85 +/-0.10 mm.

The composite shielding layer 3 is formed by combining a first shielding layer 31, a second shielding layer 32, a third shielding layer 33 and a fourth shielding layer 34 from inside to outside.

Specifically, first shielding layer 31 adopts the silver-plated copper bandlet that thickness is 0.07mm to carry out the spiral around the package and forms, adopts the butt joint form around the package, and the external diameter after the package is 4.00 +/-0.10 mm. The second shielding layer 32 is formed by weaving silver-plated round copper wires with the nominal diameter of 0.10mm, the weaving density is not less than 90%, and the outer diameter after weaving is 4.40 +/-0.10 mm. The third shielding layer 33 is formed by wrapping a double-sided copper-plastic composite tape with the nominal thickness of 0.05, the wrapping overlapping rate is not less than 25%, and the outer diameter after wrapping is 4.50 +/-0.10 mm. The fourth shielding layer 34 is formed by weaving silver-plated round copper wires with the nominal diameter of 0.10mm, the weaving density is not less than 90%, and the outer diameter after weaving is 4.90 +/-0.10 mm.

In this embodiment, a layer of fluorinated ethylene propylene is extruded outside the shielding layer 3 to form the sheath 4, the extruded nominal thickness is 0.25mm, and the extruded outer diameter is 5.40 ± 0.10 mm.

The conductor of the composite shielding coaxial cable in the embodiment is a silver-plated copper wire, so that the composite shielding coaxial cable is not easy to oxidize and has good high-temperature resistance; meanwhile, the dielectric constant of the insulating material of the cable is low, so that the weight of the cable is reduced, the transmission attenuation is reduced, and the transmission capability of the cable is improved; and the cable adopts compound shielding structure, not only makes the product can resist external low frequency interference, can also resist external high frequency interference, and transmission signal is complete undistorted.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.

Claims

1. A composite shielding coaxial cable is characterized by comprising a conductor (1), and an insulating layer (2), a composite shielding layer (3) and a sheath (4) which are sequentially wrapped outside the conductor (1) from inside to outside;

the composite shielding layer (3) is formed by combining a first shielding layer (31), a second shielding layer (32), a third shielding layer (33) and a fourth shielding layer (34) from inside to outside, the first shielding layer (31) is formed by spirally winding a silver-plated copper flat belt, the second shielding layer (32) and the fourth shielding layer (34) are formed by weaving silver-plated round copper wires, and the third shielding layer (33) is formed by winding a double-sided copper-plastic composite belt.

2. A composite shielded coaxial cable according to claim 1, characterized in that the material of the conductor (1) is silver-plated copper wire.

3. The composite shielded coaxial cable of claim 2, wherein the insulating layer (2) is formed by butt-wrapping polytetrafluoroethylene film.

4. A composite shielded coaxial cable according to claim 1 or 3, wherein the material of the sheath (4) is fluorinated ethylene propylene.