CN217035170U - Cable structure - Google Patents

Abstract

The utility model discloses a cable structure, comprising: two core wires, a resin film layer, two ground wires, a shielding layer and a Mylar layer; the core wire comprises a conductor and an insulating layer coated on the conductor; the conductor is arranged in the middle of the insulating layer; the resin film layer is coated on the two core wires in a longitudinal straight wrapping mode or a spiral wrapping mode. The two ground wires are positioned between the resin film layer and the shielding layer, and the shielding layer is wrapped on the ground wires in a spiral wrapping manner; or the two ground wires are positioned outside the shielding layer, and the shielding layer is coated on the resin film layer in a longitudinal straight-wrapping mode. The Mylar layer is provided with a plurality of layers and is positioned on the outermost layer of the cable. The utility model can realize the tight combination of each layer, thereby leading the cable to have better electrical insulation and chemical stability and improving the SI performance of the cable.

Description

Cable structure

Technical Field

The utility model relates to the technical field of cables.

Background

The PCI-Express bus is also called 3GIO, namely a third generation input/output bus, the transmission rate of the cable can reach 8 Gb/s or higher, the PCI-Express bus adopts a point-to-point technology, an independent channel can be distributed for each piece of equipment, and resources do not need to be shared among the equipment, so that the broadband resources of the equipment are fully ensured, and the data transmission rate is improved.

The existing cable structure layer is coated in a direct wrapping mode or a wrapping mode, the thickness of a direct wrapping mode is small, but the attachment is poor, the wrapping mode is too thick, impedance is prone to large fluctuation, and the performance of a wire rod is affected. Therefore, how to arrange each layer structure of the cable to improve the insulation performance, ensure the stability of the wire impedance and improve the SI performance of the cable is a technical problem to be solved urgently.

Disclosure of Invention

The utility model aims to provide a cable structure to improve the SI performance of a cable. In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model discloses a cable structure, comprising: two core wires, a resin film layer, two ground wires, a shielding layer and a Mylar layer; the core wire comprises a conductor and an insulating layer coated on the conductor; the conductor is arranged in the middle of the insulating layer; the resin film layer is coated on the two core wires in a longitudinal straight-coating mode or a spiral wrapping mode.

The two ground wires are positioned between the resin film layer and the shielding layer, and the shielding layer is wrapped on the ground wires in a spiral wrapping manner; or the two ground wires are positioned outside the shielding layer, and the shielding layer is coated on the resin film layer in a longitudinal straight-wrapping mode. The Mylar layer is provided with a plurality of layers and is positioned on the outermost layer of the cable.

Wherein the resin film layer is made of any one of PTFE, PP, expanded PTFE and expanded PP.

The insulating layer is made of any one of PE, PP, PTFE, FEP, foamed PE, foamed PP and foamed FEP. The material of the mylar layer is PET.

Furthermore, the mylar layer is wrapped outside the shielding layer in a spiral wrapping mode.

Wherein, the shielding layer is an aluminum foil.

Preferably, when adopting the heliciform around the package mode, overlap the coiling each other along the other end along the one end of cable.

Preferably, a =30% B to 50% B, where a represents the total overlapping area of each layer and B represents the total cladding area.

Wherein the concentricity of the conductor in the middle of the insulating layer is more than or equal to 90 percent.

Due to the adoption of the structure, the utility model has the following beneficial effects:

1. according to the utility model, the resin film layer is coated outside the insulating layer, and the resin film layer has contractibility, so that the resin film layer can be tightly combined with the insulating layer, and the cable has better electrical insulation and chemical stability.

2. According to different positions of the ground wire, the shielding layer selects a direct wrapping or wrapping mode: when the two ground wires are positioned between the resin film layer and the shielding layer, the shielding layer is coated on the ground wires in a spiral wrapping mode, and the ground wires can be better coated in an air gap between the shielding layer and the resin film layer by adopting spiral coating; when the two ground wires are positioned outside the shielding layer, the shielding layer is coated on the resin film layer in a direct coating mode, so that the coating thickness can be reduced, and the impedance of the wires is improved.

Drawings

Fig. 1 is a perspective view of a first embodiment.

Fig. 2 is a schematic cross-sectional view of fig. 1.

FIG. 3 is a schematic diagram of the shielding layer encapsulation according to the first embodiment.

Fig. 4 is a perspective view of the second embodiment.

Fig. 5 is a schematic cross-sectional view of fig. 4.

Fig. 6 is a schematic diagram of the shielding layer cladding in the second embodiment.

Description of the main component symbols:

1: conductor, 2: insulating layer, 3: resin film layer, 4: ground wire, 5: shielding layer, 6: a mylar layer.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example one

As shown in fig. 1 to 3, the present embodiment discloses a cable structure, including: two core wires, a resin film layer 3, two ground wires 4, a shielding layer 5 and a Mylar layer 6. Each core wire comprises a conductor 1 and an insulating layer 2 coated on the conductor 1.

The materials for each layer were as follows: the resin film layer 3 is made of any one of PTFE, PP, expanded PTFE and expanded PP. The insulating layer 2 is made of any one of PE, PP, PTFE, FEP, foamed PE, foamed PP and foamed FEP. The shielding layer 5 is an aluminum foil. In this embodiment, the insulating layer 2 is made of PTFE (teflon), the resin film layer 3 is a PTFE film, and the mylar layer 6 is a PET film.

Referring to FIG. 2, the conductor 1 is located in the middle of the insulating layer 2, and the concentricity of the conductor 1 in the middle of the insulating layer 2 is greater than or equal to 90%.

The resin film layer 3 is coated on the two core wires in a longitudinal straight wrapping mode or a spiral wrapping mode.

As shown in fig. 3, two ground wires 4 are located between the resin film layer 3 and the shielding layer 5, and the shielding layer 5 is wrapped around the ground wires 4 in a spiral manner. When the shielding layer 5 is spirally wound, the shielding layer is wound along one end of the cable and is mutually overlapped and wound along the other end of the cable. As shown in fig. 3, the areas of the overlapping regions during the spiral winding process when one shielding layer 5 is wrapped are a1, a2, A3, a4, a5, and a6 … … a11, respectively, the area of the total overlapping region is a = a1+ a2+ … … + a11, the area of the total covering region is B, and the area of the total covering region is the total outer surface area of the cable at this time, and a =30% B to 50% B. By coating with such an overlap ratio, SI performance of the cable can be improved.

The Mylar layer 6 is wrapped outside the shielding layer 5 in a spiral wrapping mode. The mylar layer 6 may be coated with one layer or two layers.

Example two

As shown in fig. 4 to 6, the present embodiment discloses a cable structure, including: two core wires, a resin film layer 3, two ground wires 4, a shielding layer 5 and a Mylar layer 6.

In this embodiment, the insulating layer 2 is made of PTFE (teflon), the resin film layer 3 is a PTFE film, and the mylar layer 6 is a PET film.

As shown in fig. 5, the core wire includes a conductor 1 and an insulating layer 2 covering the conductor 1. The conductor 1 is arranged in the middle of the insulating layer 2, and the concentricity of the conductor 1 in the middle of the insulating layer 2 is more than or equal to 90 percent.

The resin film layer 3 is coated on the two core wires in a longitudinal straight wrapping mode.

Two ground wires 4 are located the shielding layer 5 outside, and shielding layer 5 wraps on resin film layer 3 with the mode of heliciform around the package. When the shielding layer 5 is spirally wound, the shielding layer is wound along one end of the cable and is mutually overlapped and wound along the other end of the cable. As shown in fig. 6, the overlapping areas of the spiral winding process when one shielding layer 5 is wrapped are a1, a2, A3, a4, a5, and a6, respectively, so that the area of the total overlapping area is a = a1+ a2+ … … + a6, the area of the total wrapping area is B, and the total outer surface area of the cable when the total wrapping area is this time is a =45% B. By coating with such an overlap ratio, SI performance of the cable can be improved. The mylar layer 6 is wrapped outside the ground wire 4 in a spiral wrapping mode, so that the ground wire 4 is located in an air gap between the shielding layer 5 and the mylar layer 6.

While the utility model has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the following claims.

Claims (7)

1. A cable structure, comprising: two core wires, a resin film layer, two ground wires, a shielding layer and a Mylar layer;

the core wire comprises a conductor and an insulating layer coated on the conductor; the conductor is arranged in the middle of the insulating layer;

the resin film layer is coated on the two core wires in a longitudinal straight-wrapping mode or a spiral wrapping mode;

the two ground wires are positioned between the resin film layer and the shielding layer, and the shielding layer is coated on the ground wires in a spiral wrapping mode; when a spiral wrapping mode is adopted, the cables are wound along one end of the cable along the other end in an overlapping mode, the area of a total overlapping area of each layer is A, the area of a total coating area is B, and A =30% B-50% B;

the Mylar layer is arranged in a plurality of layers and is positioned on the outermost layer of the cable.

2. The cable structure of claim 1, wherein: the resin film layer is made of any one of PTFE, PP, expanded PTFE and expanded PP.

3. The cable structure of claim 1, wherein: the insulating layer is made of any one of PE, PP, PTFE, FEP, foamed PE, foamed PP and foamed FEP.

4. The cable structure of claim 1, wherein: the material of the mylar layer is PET.

5. The cable structure of claim 1, wherein: the Mylar layer is wrapped outside the shielding layer in a spiral wrapping mode.

6. The cable structure of claim 1, wherein: the shielding layer is an aluminum foil.

7. The cable structure of claim 1, wherein: the concentricity of the conductor in the middle of the insulating layer is more than or equal to 90 percent.

Images