Fixed elliptical hole-shaped solid insulated differential transmission cable

Abstract

The utility model discloses a fixed elliptical hole-shaped solid insulation differential transmission cable. Comprising a pair of inner core wires, a metal shielding layer is coated outside the pair of inner core wires, and a polyester film layer is coated outside the metal shielding layer; each inner core wire comprises an inner conductor and an insulating layer wrapping the inner conductor, and a plurality of indwelling wire holes distributed in a lotus root shape are formed in the insulating layer. The indwelling wire holes of the insulating layer in the transmission cable reduce the dielectric constant of the insulating layer, and the insulating layers with different dielectric constant requirements can be obtained through the number and the size of the indwelling wire holes, and the indwelling wire holes are controllable and effective; the original tensile strength of the insulating layer is ensured, the weight is reduced, and the production and manufacturing cost of the cable is further reduced.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a differential transmission cable with fixed elliptical hole-shaped solid insulation. Background Art

[0002] In the signal transmission system, in order to ensure that the received signal is not distorted, it is required to minimize the energy lost in the transmission process. The main factor affecting the attenuation (energy loss) of the transmission cable signal is the dielectric constant of the cable insulation layer; the smaller the dielectric constant of the insulation layer, the smaller the signal energy loss passing through the cable. Therefore, how to reduce the dielectric constant of the insulation layer has become the primary issue in the use of high-end transmission cables.

[0003] Existing high-speed transmission cables generally use foaming technology to reduce the dielectric constant of insulation. Foaming technology is to produce foaming pores in solid insulating materials by physically injecting gas or adding chemical foaming agents. Since the gas produced by the decomposition of chemical foaming agents is still a physical foaming agent such as inert gas, the solubility of gas in the melt is fixed at a certain temperature and pressure. Excessive gas will form cavities and holes in the melt, resulting in poor density. Insufficient gas cannot achieve the ideal foaming effect, so the controllability is relatively complicated. At the same time, due to the presence of pores in the melt, the wire is relatively fragile as a whole and has poor mechanical properties. Utility Model Content

[0004] In order to solve the problems in the background technology, the utility model provides a differential transmission cable with fixed elliptical hole-shaped solid insulation. The wire holes in the insulation layer of the transmission cable reduce the dielectric constant of the insulation layer, making the transmission performance of the cable better and the insertion loss lower, solving the problem of overall fragility and poor mechanical properties of the wire caused by using foaming technology to reduce the dielectric constant of the insulation.

[0005] The technical solution adopted by the utility model is:

[0006] It comprises a pair of inner core wires, which are covered with a metal shielding layer, and the metal shielding layer is covered with a polyester film layer; each inner core wire comprises an inner conductor and an insulating layer covering the inner conductor, and a plurality of wire retention holes are opened in the insulating layer, and the plurality of wire retention holes are not connected.

[0007] The insulating layer is covered on the outside of the inner conductor in an extrusion molding manner.

[0008] The cross-sectional shape of the retention wire hole is oval or circular.

[0009] The plurality of wire retention holes are distributed in the insulating layer at circumferential intervals in the axial direction.

[0010] The insulating layer is made of one of PE, PP and FEP plastic materials.

[0011] One or two ground wires are arranged between the polyester film layer and the metal shielding layer.

[0012] The metal shielding layer is one of aluminum foil Mylar, copper foil Mylar and tin foil Mylar.

[0013] The material of the ground wire is one of silver-plated copper and tin-plated copper.

[0014] The beneficial effects of the utility model are:

[0015] 1. Reduce costs: The requirements for the equipment used are reduced, and the existing ordinary extruder can be used. It no longer relies on high-precision imported foaming equipment, which greatly reduces production costs;

[0016] 2. Convenient control: Through the mechanical mode, the wire holes are more uniform and stable, without cross holes, and the dielectric constant of the overall insulation layer is stable

[0017] 3. Good mechanical properties: The dielectric constant of the insulation layer is reduced, and the insulation layer with different dielectric constant requirements can be obtained by adjusting the number and size of the wire holes, which is controllable and effective; it not only ensures the original tensile strength of the insulation layer, but also reduces the weight, further reducing the production cost of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a transmission cable.

[0019] Figure 2 Schematic diagram of the structure of the inner core wire of the transmission cable.

[0020] In the figure: conductor 1; wire hole 2; insulating layer 3; polyester film layer 4; metal shielding layer 5; ground wire 6. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 and Figure 2 As shown, the differential transmission cable includes a pair of inner core wires, the pair of inner core wires are covered with a metal shielding layer 5, the metal shielding layer 5 is covered with a polyester film layer 4, each inner core wire includes an inner conductor 1 and an insulating layer 3 covering the inner conductor 1, a plurality of wire retention holes 2 are opened in the insulating layer 3, and the cross-section of the insulating layer 3 is lotus-shaped.

[0023] The cross-sectional shape of the wire retention hole 2 is elliptical, and multiple wire retention holes 2 are circumferentially spaced in the insulating layer 3 along the axial direction. The multiple wire retention holes 2 are not connected to each other. By fixing the insulating layer 3 of the elliptical wire retention holes 2, the dielectric constant of the insulating layer 3 is reduced, and the number and size of the wire retention holes 2 are adjusted to obtain an insulating layer with different dielectric constant requirements. This is controllable and effective, which not only ensures the original tensile strength of the insulating layer 3, but also reduces the weight of the insulating layer by 30%-50%, further reducing the production cost of the cable.

[0024] The insulating layer 3 is wrapped around the inner conductor 1 by extrusion molding, and the wire hole 2 for fixing the insulating layer 3 is realized. The material of the insulating layer 3 is PE plastic material, the material of the metal shielding layer 5 is aluminum foil Mylar, and two ground wires 6 are arranged between the polyester film layer 4 and the metal shielding layer 5. The material of the ground wire 6 is silver-plated copper.

[0025] The transmission cable of the utility model makes the wire holes 2 more uniform and stable through a mechanical mode without stringing holes, so that the dielectric constant of the insulating layer 3 is stable, and the wire is filled with air to achieve a foaming effect.

Claims

1. A differential transmission cable with fixed elliptical hole-shaped solid insulation, characterized in that: The invention comprises a pair of inner core wires, wherein the outer surface of the pair of inner core wires is covered with a metal shielding layer (5), and the outer surface of the metal shielding layer (5) is covered with a polyester film layer (4); each inner core wire comprises an inner conductor (1) and an insulating layer (3) covering the inner conductor (1), and a plurality of wire retention holes (2) are formed in the insulating layer (3), and the plurality of wire retention holes (2) are not connected to each other.

2. The fixed elliptical hole solid insulated differential transmission cable according to claim 1, characterized in that: The insulating layer (3) is coated on the outside of the inner conductor (1) in an extrusion molding manner.

3. A fixed elliptical hole solid insulated differential transmission cable according to claim 1, characterized in that: The cross-sectional shape of the retention wire hole (2) is elliptical or circular.

4. The fixed elliptical hole solid insulated differential transmission cable according to claim 1, characterized in that: The plurality of wire retention holes (2) are distributed in the insulating layer (3) at circumferential intervals in the axial direction.

5. The fixed elliptical hole solid insulated differential transmission cable according to claim 1, characterized in that: The insulating layer (3) is made of one of PE, PP and FEP plastic materials.

6. The fixed elliptical hole solid insulated differential transmission cable according to claim 1, characterized in that: One or two ground wires (6) are provided between the polyester film layer (4) and the metal shielding layer (5).

7. The fixed elliptical hole solid insulated differential transmission cable according to claim 1, characterized in that: The metal shielding layer (5) is one of aluminum foil Mylar, copper foil Mylar and tin foil Mylar.

8. The fixed elliptical hole solid insulated differential transmission cable according to claim 6, characterized in that: The material of the ground wire (6) is one of silver-plated copper and tin-plated copper.

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