High speed transmission cable

Abstract

A kind of high-speed transmission cable. It solves the problem of weak transmission performance of existing high-speed transmission cable. It includes a sheath layer, and further comprises: a braided layer, the braided layer is arranged in the sheath layer;First wire harness, arranged in the braided layer;The first wire harness includes a first conductor, an insulating layer and a first aluminum foil layer, the insulating layer is sleeved outside the first conductor, the first aluminum foil layer is arranged outside the insulating layer, and the insulating layer includes a foamed polypropylene layer.The utility model has the advantages that the foamed polypropylene layer is arranged, the transmission performance is improved, compared with the traditional solid polypropylene, the dielectric constant of insulation is effectively reduced, which lays the foundation for the stability of signal transmission;Compared with perfluoroethylene propylene copolymer, it is more environmentally friendly.The utility model also has the advantages of simple structure, high safety, long service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a high-speed transmission cable. Background Technology

[0002] High-speed transmission cabling is a crucial medium or carrier for signal transmission between high-speed backplanes. A high-speed backplane is a core interconnecting circuit board within large electronic devices (especially communication equipment such as core routers, high-end switches, large servers, telecom base station controllers, and testing instruments). High-speed transmission cabling is used to transmit high-speed electrical or optical signals between two physically separate devices or between modules over long distances within a device. Existing high-speed transmission cabling typically consists of conductors and insulation. The insulation is usually made of solid polypropylene in a single molding process, which increases the dielectric constant of the insulation, leading to unstable signal transmission. Ordinary solid materials are insufficient to meet this transmission performance requirements. Another option is to use perfluoroethylene-propylene copolymer, which does not meet PFAS standards (PFAS definition: compounds containing at least one perfluoromethyl or methylene carbon atom). Due to its persistence, bioaccumulation, and toxicity, it is considered to require stricter control. Its slow degradation rate results in poor environmental performance, and polypropylene materials have poor flame retardancy, generally failing to meet UL level flammability tests (UL certification refers to the industry standard for product safety certification in the United States, established by US safety testing laboratories; UL standards protect people from electric shock, fire, and bodily injury). Utility Model Content

[0003] To address the problem of weak transmission performance in existing high-speed transmission cabling in the background art, this utility model provides a high-speed transmission cabling.

[0004] The technical solution of this utility model is: a high-speed transmission cable, including a sheath layer, and further comprising:

[0005] The braided layer is disposed within the sheath layer;

[0006] The first wire harness is disposed within the braided layer; the first wire harness includes a first conductor, an insulating layer and a first aluminum foil layer, the insulating layer is sleeved outside the first conductor, the first aluminum foil layer is disposed outside the insulating layer, and the insulating layer includes a foamed polypropylene layer.

[0007] As a further improvement of this utility model, the insulating layer includes a solid polypropylene layer, which has two layers, and the foamed polypropylene layer is disposed between the two solid polypropylene layers.

[0008] As a further improvement of this utility model, the thickness of the insulating layer is 0.13-0.17 mm, and the thickness of the foamed polypropylene layer is 0.03-0.06 mm.

[0009] As a further improvement of this utility model, it also includes a second aluminum foil layer, which is disposed outside the first aluminum foil layer.

[0010] As a further improvement of this utility model, the first aluminum foil layer is wrapped around the outside of the insulating layer along the axial direction of the first wire bundle, and the second aluminum foil layer is wound around the first aluminum foil layer circumferentially.

[0011] As a further improvement of this utility model, it also includes a first Mylar layer, which covers the second aluminum foil layer.

[0012] As a further improvement of this utility model, the first wire harness has two wires arranged side by side; the first wire harness is covered with a third aluminum foil layer; and a second wire harness is provided between the third aluminum foil layer and the braided layer.

[0013] As a further improvement of this utility model, the second wire harness has multiple strands, and a second Mylar layer is provided between the third aluminum foil layer and the braided layer. The multiple second wire harnesses are arranged in a ring between the third aluminum foil layer and the second Mylar layer.

[0014] As a further improvement of this utility model, it also includes a middle sheath layer. The first wire harness includes two first conductors, each of which is provided with an insulating layer. The middle sheath layer covers the insulating layers of the two first conductors.

[0015] As a further improvement of this utility model, it also includes a ground wire. Each first wire bundle is arranged in a flat shape. There are two ground wires and they are located at both ends of the flat first wire bundle. The ground wires are located on the outside of the first aluminum foil layer. The middle sheath is integrally molded using LLDPE.

[0016] The beneficial effects of this invention are that the addition of a foamed polypropylene layer improves transmission performance and effectively reduces the dielectric constant of insulation compared to traditional solid polypropylene, laying the foundation for stable signal transmission; it is also more environmentally friendly than perfluoroethylene-propylene copolymer. This invention also boasts advantages such as simple structure, high safety, and long service life. Attached Figure Description

[0017] Appendix Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0018] Appendix Figure 2 This is a schematic diagram of the structure of the first wire harness in an embodiment of this utility model.

[0019] Appendix Figure 3 This is a schematic diagram of the structure of the insulating layer in an embodiment of the present invention.

[0020] In the diagram, 1 is the sheath layer; 2 is the braided layer; 3 is the first wire harness; 31 is the first conductor; 32 is the insulation layer; 321 is the foamed polypropylene layer; 322 is the solidified polypropylene layer; 33 is the first aluminum foil layer; 34 is the second aluminum foil layer; 35 is the first Mylar layer; 36 is the middle sheath layer; 37 is the ground wire; 4 is the third aluminum foil layer; 5 is the second wire harness; and 6 is the second Mylar layer. Detailed Implementation

[0021] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0022] Depend on Figure 1 Combination Figure 2-3 As shown, a high-speed transmission cable includes a sheath layer 1, and further includes:

[0023] Braided layer 2, wherein the braided layer 2 is disposed within the sheath layer 1;

[0024] The first wire harness 3 is disposed within the braided layer 2. The first wire harness 3 includes a first conductor 31, an insulation layer 32, and a first aluminum foil layer 33. The insulation layer 32 is sleeved outside the first conductor 31, and the first aluminum foil layer 33 is disposed outside the insulation layer 32. The insulation layer 32 includes a foamed polypropylene layer 321. The beneficial effects of this invention are that the foamed polypropylene layer improves transmission performance, effectively reducing the dielectric constant of the insulation compared to traditional solid polypropylene, thus laying the foundation for stable signal transmission; and it is more environmentally friendly than perfluoroethylene-propylene copolymer. This invention also has advantages such as simple structure, high safety, and long service life. Specifically, the first conductor of this invention is integrally molded from silver-plated copper material, and the alloy conductor has high tensile strength and good conductivity. The braided layer of this invention can effectively impede external signal interference, enhance the mechanical strength of the cable, prevent internal breakage, maintain the overall internal shape, and the sheath layer provides excellent protection.

[0025] The insulation layer 32 includes two layers of solid polypropylene 322, with a foamed polypropylene layer 321 disposed between the two solid polypropylene layers 322. Specifically, the thickness of the insulation layer 32 is 0.13-0.17 mm, and the thickness of the foamed polypropylene layer 321 is 0.03-0.06 mm. This invention improves transmission performance through foaming. Since increased foaming leads to greater changes in bending impedance, conventional processes struggle to simultaneously meet both bending impedance and transmission performance requirements. This invention employs an FSF sheath structure for the core wire extrusion, consisting of a solid polypropylene layer + a foamed polypropylene layer + a solid polypropylene layer. This structure effectively prevents the drawback of foamed wires being less pressure-resistant. This invention offers the following advantages: small wire diameter, small size, light weight, easy to carry and use; good transmission performance; strong bending resistance; and good flame retardant performance, meeting FT2 requirements (FT2 flame retardant standard is an indicator of a material's flame retardancy, based on the degree of flame spread and the degree of protection for sensitive objects).

[0026] This invention also includes a second aluminum foil layer 34, which is disposed outside the first aluminum foil layer 33. Specifically, the first aluminum foil layer 33 is wrapped around the insulation layer 32 along the axial direction of the first wire harness 3, and the second aluminum foil layer 34 is wound around the first aluminum foil layer 33 circumferentially. A layer of PP aluminum foil (first aluminum foil layer) is dragged around the core wire inside the whole. This wrapping tape is soft and does not increase the product's hardness, has high tensile strength, and low dielectric constant, which can effectively prevent the external transmission of internal signals. A layer of aluminum foil (second aluminum foil layer) is uniformly wrapped around the dragging aluminum foil tape to form a shielding layer with an overlap rate of 25%, which plays a good role in impeding external signal interference. Specifically, the first aluminum foil layer is arranged longitudinally (along the axial direction of the first conductor), and the second aluminum foil layer is arranged laterally (wound circumferentially along the first conductor).

[0027] This invention also includes a first Mylar layer 35, which covers the second aluminum foil layer 34. The Mylar layer is integrally molded from PET polyester film, a material with a certain water-resistant effect. Adding this wrapping can prevent moisture from damaging the insulation of the wire in a humid household environment.

[0028] The first wire harness 3 consists of two wires arranged side-by-side. A third aluminum foil layer 4 is sheathed around the first wire harness 3. A second wire harness 5 is disposed between the third aluminum foil layer 4 and the braided layer 2. Specifically, there are multiple second wire harnesses 5, and a second Mylar layer 6 is disposed between the third aluminum foil layer 4 and the braided layer 2. The multiple second wire harnesses 5 are arranged in a ring between the third aluminum foil layer 4 and the second Mylar layer 6. This increases the overall roundness of the wire. More specifically, the structure of the second wire harness and the first wire harness of this invention is the same or similar, and will not be described in detail here.

[0029] This utility model also includes a middle sheath layer 36. The first wire harness 3 includes two first conductors 31, each of which is provided with an insulation layer 32. The middle sheath layer 36 covers the insulation layer 32 of the two first conductors 31. It also includes ground wires 37. Each first wire harness 3 is flat, and there are two ground wires 37 located at both ends of the flat first wire harness 3. The ground wires 37 are located outside the first aluminum foil layer 33. The middle sheath layer 36 is integrally molded from LLDPE. The middle sheath layer is integrally molded from linear low-density polyethylene (LLDPE), which has good elongation, puncture resistance, and tear resistance. The ground wires are made of tin-plated copper, an alloy conductor with high tensile strength and good oxidation resistance.

[0030] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0032] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A high-speed transmission cable, comprising a sheath layer (1), characterized in that: Also includes: Braided layer (2), wherein the braided layer (2) is disposed within the sheath layer (1); The first wire harness (3) is disposed within the braided layer (2); the first wire harness (3) includes a first conductor (31), an insulating layer (32) and a first aluminum foil layer (33), the insulating layer (32) is sleeved outside the first conductor (31), the first aluminum foil layer (33) is disposed outside the insulating layer (32), and the insulating layer (32) includes a foamed polypropylene layer (321).

2. The high-speed transmission cable according to claim 1, characterized in that... The insulating layer (32) includes a solid polypropylene layer (322), which has two layers, and the foamed polypropylene layer (321) is disposed between the two solid polypropylene layers (322).

3. The high-speed transmission cable according to claim 1, characterized in that... The thickness of the insulating layer (32) is 0.13-0.17 mm, and the thickness of the foamed polypropylene layer (321) is 0.03-0.06 mm.

4. A high-speed transmission cable according to claim 1, characterized in that... It also includes a second aluminum foil layer (34), which is disposed outside the first aluminum foil layer (33).

5. A high-speed transmission cable according to claim 4, characterized in that... The first aluminum foil layer (33) is wrapped around the insulation layer (32) along the axial direction of the first wire bundle (3), and the second aluminum foil layer (34) is circumferentially wound around the first aluminum foil layer (33).

6. A high-speed transmission cable according to claim 4, characterized in that... It also includes a first Mylar layer (35), which covers the second aluminum foil layer (34).

7. A high-speed transmission cable according to claim 1, characterized in that... The first wire harness (3) has two wires and the two first wire harnesses (3) are arranged side by side; the first wire harness (3) is covered with a third aluminum foil layer (4); a second wire harness (5) is provided between the third aluminum foil layer (4) and the braided layer (2).

8. A high-speed transmission cable according to claim 7, characterized in that... The second wire bundle (5) has multiple strands, and a second Mylar layer (6) is provided between the third aluminum foil layer (4) and the braided layer (2). The multiple second wire bundles (5) are arranged in a ring between the third aluminum foil layer (4) and the second Mylar layer (6).

9. A high-speed transmission cable according to claim 1, characterized in that... It also includes a middle sheath (36), the first wire harness (3) includes two first conductors (31), each of the first conductors (31) is provided with an insulation layer (32), and the middle sheath (36) covers the insulation layer (32) of the two first conductors (31).

10. A high-speed transmission cable according to claim 9, characterized in that... It also includes a ground wire (37), each first wire bundle (3) is flat, there are two ground wires (37) and they are located at both ends of the flat first wire bundle (3), the ground wires (37) are located on the outside of the first aluminum foil layer (33), and the middle layer (36) is integrally formed using LLDPE.

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