CN107993753A - A kind of small outside diameter high-speed cable of low-loss - Google Patents

Abstract

The invention discloses a high-speed cable with low loss and small outer diameter, which is characterized in that it includes several wire core groups, a first shielding layer covering the several wire core groups, and a first shielding layer covering the first shielding layer. The outer second shielding layer and the outer sheath covered outside the second shielding layer; each of the core groups includes two core wires, and the first L/EPTFE polymer wrapping the two core wires at the same time The tetrafluoroethylene insulating layer, the third shielding layer wrapped outside the L/EPTFE polytetrafluoroethylene insulating layer and the small outer layer wrapped outside the third shielding layer; the core wire includes The inner conductor and the second L/EPTFE polytetrafluoroethylene layer wrapped around the inner conductor. The invention can achieve 100% shielding effect, and the insulation protection effect is also very good; and the inner conductor of the invention is wrapped with L/EPTFE polytetrafluoroethylene layer, which not only makes the wire soft, but also improves the temperature resistance of the wire , and its temperature resistance reaches ‑45°C to 200°C.

Description

A low-loss small outer diameter high-speed cable

technical field

The invention relates to the technical field of electronic signal interface cables, in particular to a high-speed cable with low loss and small outer diameter.

Background technique

At present, electronic signal interface lines such as SFP, QSFP, and CXP are gradually applied in communication equipment. SFP (SmallForm-factor Pluggables) can be simply understood as an upgraded version of GBIC; the SFP module (half the size of the GBIC module, can configure more than double the number of ports on the same panel; because the SFP module is functionally the same as the GBIC Basically the same, therefore, it is also called miniaturized GBIC (Mini-GBIC) by some switch manufacturers; the SFP module compresses the size and power consumption by placing the CDR and electrical dispersion compensation outside the module; it is used for telecommunications and data Optical communication applications in communication; SFP connects network equipment such as switches, routers, etc. The density of high-speed pluggable solutions was born; the transmission rate of this 4-channel pluggable interface has reached more than 40Gbps. The transmission rate of CXP optical modules is as high as 12×10Gbps, which supports hot swapping. CXP optical modules mainly For the high-speed computer market, it is a supplement for CFP optical modules in Ethernet data centers.

At present, the shielding and insulation protection effects of interface wires such as SFP, QSFP, and CXP are poor, and the insulator of the core wire adopts a solid or foamed extrusion insulation structure, which has relatively hard insulation and poor temperature resistance. It is difficult to connect in a small indoor space. inconvenient.

Contents of the invention

The technical problem to be solved by the present invention is to provide a low-loss small outer diameter high-speed cable with good shielding and insulation protection effects, soft wires, and good temperature resistance based on the above-mentioned deficiencies in the prior art.

In order to solve the above technical problems, the technical solution of the present invention is: a low-loss small outer diameter high-speed cable, including several strand core groups, wrapped in the first shielding layer outside the strand core groups, wrapped in The second shielding layer outside the first shielding layer and the outer sheath covering the outside of the second shielding layer; each core group includes two core wires, and the second core wire wrapping the two core wires at the same time An L/EPTFE polytetrafluoroethylene insulating layer, a third shielding layer wrapped outside the L/EPTFE polytetrafluoroethylene insulating layer, and a small outer layer wrapped outside the third shielding layer; The core wire includes an inner conductor and a second L/EPTFE polytetrafluoroethylene layer wrapped around the inner conductor.

Preferably, the first shielding layer is an aluminum foil layer or a copper foil layer with a thickness of 6-25 μm, wherein the aluminum foil layer is pure aluminum foil, single-sided aluminum foil Mylar, double-sided aluminum foil Mylar, single-sided aluminum foil hot-melt Mylar , any one of double-sided aluminum foil hot-melt Mylar, the copper foil layer is pure copper foil, single-sided copper foil Mylar, double-sided copper foil Mylar, single-sided copper foil hot-melt Mylar, double-sided copper foil hot Any one of melting mylar; the second shielding layer is a braided layer of tinned copper wire or a braided layer of tinned copper-clad aluminum wire, and the diameter of the tinned copper wire or tinned copper-clad aluminum wire is 102- 127 μm; the outer sheath is any one of flame-retardant PVC polyvinyl chloride, LSZH low-smoke halogen-free polyolefin, TPU thermoplastic polyurethane elastomer rubber, and PE polyethylene.

Preferably, the third shielding layer is a wrapping aluminum foil layer or copper foil layer with a thickness of 6-25 μm, wherein the aluminum foil layer is pure aluminum foil, single-sided aluminum foil Mylar, double-sided aluminum foil Mylar, single-sided aluminum foil hot-melt Any one of Mylar and double-sided aluminum foil hot-melt Mylar, the copper foil layer is pure copper foil, single-sided copper foil Mylar, double-sided copper foil Mylar, single-sided copper foil hot-melt Mylar, double-sided copper Any one of foil hot-melt Mylar; the small outer layer is a hot-melt PET tape layer with a thickness of 6-25 μm; the inner conductor is silver-plated copper, tin-plated copper, bare copper, or silver-plated copper clad Any one of steel and silver-plated copper-clad aluminum conductors, with a diameter of 40-511 μm and a coating thickness of 0.3-2.0 μm.

Preferably, a ground wire is also provided between the first L/EPTFE polytetrafluoroethylene insulating layer and the third shielding layer, and the ground wire is located on the side of the gap between the two core wires; the ground wire is silver-plated Any one of copper, tinned copper, bare copper, silver-plated copper-clad steel, and silver-plated copper-clad aluminum conductors, with a diameter of 40-511 μm; the thickness of the coating is 0.3-2.0 μm.

Preferably, the wire core group has two strands, four strands or eight strands, all of which are arranged in the first shielding layer.

Preferably, the wire core group has 24 strands, and every two wire core groups form a wire core group pair, forming a total of 12 wire core group pairs, and each wire core group pair is covered with a fourth shielding layer; the 12-strand wire core group pair is divided into three inner wire core group pairs and nine outer wire core group pairs. The rings are evenly distributed on the outer side of the inner wire core group.

Preferably, two ground wires are also provided between the first L/EPTFE polytetrafluoroethylene insulating layer and the third shielding layer, and the two ground wires are respectively located on both sides of the two core wires; the ground wires It is any one of silver-plated copper, tin-plated copper, bare copper, silver-plated copper-clad steel, and silver-plated copper-clad aluminum conductor, with a diameter of 40-511 μm and a thickness of 0.3-2.0 μm. Further, the wire core group has 8 strands, and the 8-strand wire core group is divided into 2 inner wire core groups and 6 outer wire core groups, and the 6 outer wire core groups are evenly distributed on the outside of the inner wire core group in a ring.

Preferably, the third shielding layer is a circle of closely arranged copper wires or aluminum wires, the small outer layer is a hot-melt PET tape layer with a thickness of 6-25 μm; the inner conductor is silver-plated copper, Any one of tin-copper, bare copper, silver-plated copper-clad steel, and silver-plated copper-clad aluminum conductors, with a diameter of 40-511 μm and a coating thickness of 0.3-2.0 μm. Further, the wire core group has 8 strands, and the 8-strand wire core group is divided into 2 inner wire core groups and 6 outer wire core groups, and the 6 outer wire core groups are evenly distributed on the outside of the inner wire core group in a ring.

The beneficial effects of the present invention are: one, the multi-layer shielding layer and the sheath layer outside several strands of coaxial lines or wire core groups of the present invention can make the present invention achieve 100% shielding effect on signals, and the insulation protection effect is also Very good; second, the inner conductor of the present invention is wrapped with an L/EPTFE polytetrafluoroethylene layer, which not only makes the wire soft, but also improves the temperature resistance of the wire, and its temperature resistance reaches -45°C to 200°C. ℃.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a core set in Embodiment 1.

Fig. 2 is a schematic cross-sectional structure diagram of a flexible packaging interface wire with two wire core groups in the first embodiment.

Fig. 3 is a schematic cross-sectional structure diagram of a flexible packaging interface wire with a four-strand wire core group in Embodiment 1.

Fig. 4 is a schematic cross-sectional structure diagram of a flexible packaging interface wire with an eight-strand wire core set in Embodiment 1.

Fig. 5 is a schematic cross-sectional structure diagram of a flexible packaging interface wire with 24 wire core groups in the first embodiment.

Fig. 6 is a schematic cross-sectional structure diagram of the wire core group in the second embodiment.

Fig. 7 is a schematic cross-sectional structure diagram of a low-loss small outer diameter high-speed cable with an eight-strand wire core group in Embodiment 2.

Fig. 8 is a schematic cross-sectional structure diagram of the wire core group in the third embodiment.

Fig. 9 is a schematic cross-sectional structure diagram of a low-loss small outer diameter high-speed cable with an eight-strand core group in Embodiment 3.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

As shown in Figures 1-5, a high-speed cable with low loss and small outer diameter includes several strand core groups 100, the first shielding layer 1 wrapped outside the several strand core groups 100, and the first shielding layer 1 coated on the second A second shielding layer 2 outside the shielding layer and an outer sheath 3 covering the outside of the second shielding layer; each of the core groups 100 includes two core wires 4, and wrapping the two cores at the same time The first L/EPTFE polytetrafluoroethylene insulating layer 5 of the wire 4, the third shielding layer 6 wrapped outside the L/EPTFE polytetrafluoroethylene insulating layer, and the third shielding layer wrapped outside the third shielding layer The small outer layer 7; the core wire 4 includes an inner conductor 41 and a second L/EPTFE polytetrafluoroethylene layer 42 wrapped around the inner conductor.

The first shielding layer 1 is an aluminum foil layer or a copper foil layer with a thickness of 6-25 μm, wherein the aluminum foil layer is pure aluminum foil, single-sided aluminum foil Mylar, double-sided aluminum foil Mylar, single-sided aluminum foil hot-melt Mylar, double-sided Any one of the surface aluminum foil hot-melt Mylar, the copper foil layer is pure copper foil, single-sided copper foil Mylar, double-sided copper foil Mylar, single-sided copper foil hot-melt Mylar, double-sided copper foil hot-melt Mylar Any one of the pulls; the second shielding layer 2 is a braided layer of tinned copper wire or a braided layer of tinned copper-clad aluminum wire, and the diameter of the tinned copper wire or tinned copper-clad aluminum wire is 102-127 μm ; The outer sheath 3 is any one of flame-retardant PVC polyvinyl chloride, LSZH low-smoke halogen-free polyolefin, TPU thermoplastic polyurethane elastomer rubber, and PE polyethylene.

The third shielding layer 5 is a wrapping aluminum foil layer or copper foil layer with a thickness of 6-25 μm, wherein the aluminum foil layer is pure aluminum foil, single-sided aluminum foil Mylar, double-sided aluminum foil Mylar, single-sided aluminum foil hot-melt Mylar , any one of double-sided aluminum foil hot-melt Mylar, the copper foil layer is pure copper foil, single-sided copper foil Mylar, double-sided copper foil Mylar, single-sided copper foil hot-melt Mylar, double-sided copper foil hot Any one of melting mylar; the small outer layer 7 is a hot-melt PET tape layer with a thickness of 6-25 μm; the inner conductor 41 is silver-plated copper, tin-plated copper, bare copper, or silver-plated copper clad Any one of steel and silver-plated copper-clad aluminum conductors, with a diameter of 40-511 μm and a coating thickness of 0.3-2.0 μm.

As shown in Figure 1, a ground wire 8 is also provided between the first L/EPTFE polytetrafluoroethylene insulating layer 5 and the third shielding layer 6, and the ground wire 8 is located on the side of the gap between the two core wires 41. The ground wire 8 is any one of silver-plated copper, tin-plated copper, bare copper, silver-plated copper-clad steel, and silver-plated copper-clad aluminum conductor, with a diameter of 40-511 μm; the thickness of the coating is 0.3-2.0 μm .

As shown in FIGS. 2-4 , the wire core set 100 has two strands, four strands or eight strands, all of which are arranged inside the first shielding layer 1 . A control wire 9 is provided in the middle of the cable with the four-strand wire core group 100 .

As shown in Figure 5, the wire core group 100 has 24 strands, and every two wire core groups 100 form a wire core group pair, forming a total of 12 wire core group pairs, and each wire core group pair is wrapped Covered with a fourth shielding layer; the 12-strand core pair is divided into three inner core pairs and nine outer core pairs, and the three inner core pairs are arranged in the middle of a low-loss small outer diameter high-speed cable. Nine strands of outer wire core group pairs are evenly distributed on the outer side of the inner wire core group pairs.

Embodiment two

As shown in Fig. 6 and Fig. 7, compared with embodiment one, the difference between embodiment two is that two grounds are also arranged between the first L/EPTFE polytetrafluoroethylene insulating layer 5 and the third shielding layer 6 of embodiment two. wire 10, the two ground wires 10 are located on both sides of the two core wires 4; Any one of them, the diameter is 40-511μm; the thickness of the coating is 0.3-2.0μm.

As shown in FIG. 7 , the core set 100 has 8 strands. The 8-strand core set is divided into 2 inner core sets and 6 outer core sets. The 6 outer core sets are evenly distributed on the outside of the inner core set.

Embodiment Three

As shown in Figures 8 and 9, compared with Embodiment 1, Embodiment 3 differs in that the third shielding layer 6 of Embodiment 3 is a circle of closely arranged copper wires or aluminum wires, and the wire core group 100 has 8 The 8-strand wire core group is divided into 2 inner wire core groups and 6 outer wire core groups, and the 6 outer wire core groups are evenly distributed on the outside of the inner wire core group.

The above is only a preferred embodiment of the present invention, and any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical solution of the present invention fall within the scope of the technical solution of the present invention.

Claims (10)

1. A kind of 1. small outside diameter high-speed cable of low-loss, it is characterised in that：Including some bursts of core groups, some bursts of core groups are coated on Outside first screen layer, the secondary shielding layer being coated on outside first screen layer and the outer shield being coated on outside secondary shielding layer Set；Each core group includes the first L/EPTFE teflon insulations of two articles of cored wires while wrapped two articles of cored wires Layer, around the 3rd shielded layer being wrapped in outside the L/EPTFE teflon insulations layer and around being wrapped in the 3rd shielded layer Outside small serving；The cored wire includes inner wire and around the 2nd L/EPTFE polytetrafluoroethyl-ne being wrapped in outside the inner wire Alkene layer.
2. 2. the small outside diameter high-speed cable of low-loss according to claim 1, it is characterised in that：The first screen layer is aluminium foil Layer or copper foil layer, thickness are 6-25 μm, wherein, aluminium foil layer is pure aluminum foil, single side aluminium foil wheat is drawn, double-sided aluminum foil wheat is drawn, single side aluminium The drawing of paper tinsel hot melt wheat, double-sided aluminum foil heat any one during wheat is drawn, and copper foil layer is pure copper foil, single side copper foil wheat is drawn, two-sided copper foil Mai La, single side copper foil heat any one in wheat drawing, the hot melt wheat drawing of two-sided copper foil；The secondary shielding layer is tinned copper wire A diameter of 102-127 μm of the braiding layer of braiding layer or tin-coated copper plated aluminium silk, tinned copper wire or tin-coated copper plated aluminium silk；It is described outer Sheath is flame-proof PVC polyvinyl chloride, in LSZH low-smoke halogen-free polyolefins, TPU thermoplastic polyurethane elastomer rubber, PE polyethylene It is any.
3. 3. the small outside diameter high-speed cable of low-loss according to claim 1, it is characterised in that：3rd shielded layer is wrapped Aluminium foil layer or copper foil layer, thickness are 6-25 μm, wherein, aluminium foil layer is pure aluminum foil, single side aluminium foil wheat is drawn, double-sided aluminum foil wheat is drawn, single Face aluminium foil hot melt wheat drawing, double-sided aluminum foil heat any one during wheat is drawn, and copper foil layer is pure copper foil, single side copper foil wheat is drawn, is two-sided The drawing of copper foil wheat, single side copper foil heat any one in wheat drawing, the hot melt wheat drawing of two-sided copper foil；The small serving melts PET for heat Belt, thickness are 6-25 μm；The inner wire is silver-plated copper, in tin-coated copper, naked copper, silver-copper plated steel clad, silver-plated copper coating aluminum conductor Any one, a diameter of 40-511 μm, the thickness of coating is 0.3-2.0 μm.
4. 4. the small outside diameter high-speed cable of low-loss according to claim 3, it is characterised in that：First L/EPTFE poly- four A ground wire is additionally provided between vinyl fluoride insulating layer and the 3rd shielded layer, the ground wire is positioned at the crack side of two cored wires；It is described Ground wire is silver-plated copper, tin-coated copper, naked copper, silver-copper plated steel clad, any one in silver-plated copper coating aluminum conductor, a diameter of 40-511 μ m；The thickness of coating is 0.3-2.0 μm.
5. 5. the small outside diameter high-speed cable of low-loss according to claim 4, it is characterised in that：The core group have two strands, Four strands or stereotyped writing, may be contained within first screen layer.
6. 6. the small outside diameter high-speed cable of low-loss according to claim 4, it is characterised in that：The core group has 24 strands, Every two bursts of core groups form one core group pair, form 12 bursts of core groups pair altogether, and per share core group is coated with the 4th to it Shielded layer；12 bursts of core groups are to being divided into core group pair and nine bursts of outer core groups pair in three strands, and core group is in product in three strands Font is arranged in the middle part of the small outside diameter high-speed cable of low-loss, and nine bursts of outer core groups are distributed in annular interior core group to outside.
7. 7. the small outside diameter high-speed cable of low-loss according to claim 3, it is characterised in that：First L/EPTFE poly- four Two ground wires are additionally provided between vinyl fluoride insulating layer and the 3rd shielded layer, two ground wire is respectively positioned at two sides of two cored wires； The ground wire is silver-plated copper, tin-coated copper, naked copper, silver-copper plated steel clad, any one in silver-plated copper coating aluminum conductor, a diameter of 40- 511μm；The thickness of coating is 0.3-2.0 μm.
8. 8. the small outside diameter high-speed cable of low-loss according to claim 7, it is characterised in that：The core group is with 8 strands, 8 Strand core component is core group and 6 bursts of outer core groups in 2 strands, and 6 bursts of outer core group annulars are distributed in the outside of interior core group.
9. 9. the small outside diameter high-speed cable of low-loss according to claim 1, it is characterised in that：3rd shielded layer is a circle Compact arranged copper conductor or aluminum conductor, the small serving melt PET strip layer for heat, and thickness is 6-25 μm；The inner wire is Any one in silver-plated copper, tin-coated copper, naked copper, silver-copper plated steel clad, silver-plated copper coating aluminum conductor, a diameter of 40-511 μm, coating Thickness be 0.3-2.0 μm.
10. 10. the small outside diameter high-speed cable of low-loss according to claim 9, it is characterised in that：The core group is with 8 strands, 8 Strand core component is core group and 6 bursts of outer core groups in 2 strands, and 6 bursts of outer core group annulars are distributed on the outside of interior core group.