High-temperature-resistant and bending-resistant parallel high-speed transmission cable

Abstract

The application relates to the technical field of transmission cables, in particular to a high-temperature-resistant and bending-resistant parallel high-speed transmission cable. The periphery of the conductor arranged in parallel is fully coated with an insulation layer, and the periphery of the insulation layer is successively coated with a first shielding layer and a second shielding layer. The insulation layer is coated on all the conductors by one-time extrusion forming, and the first shielding layer and the second shielding layer are fully attached and contacted, so that no cavity exists in the cable, the insulation layer is stable in one-time forming, is not prone to deformation under high-temperature, bending working conditions and tests, and the structural stability and temperature resistance are ensured; the hot-melt PET polyester tape is spirally wrapped on the periphery of the second shielding layer, and the hot-melt PET polyester tape is hot-melt attached on the second shielding layer, so that the internal structure is stable and not prone to deformation, and the SI high-frequency performance of the cable can be ensured under the environment of 105 DEG C high temperature and bending.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission cable, in particular to a high-temperature-resistant and bending-resistant parallel high-speed transmission cable. BACKGROUND

[0002] The existing parallel high-speed cable structure is a structure of two parallel core wires plus an inner sheath layer plus a shielding layer, that is, two core wires + an inner sheath layer + a shielding layer. This structure undergoes two extrusion processes. The first extrusion process is to form an insulation layer of a single core wire, and the second extrusion process is to place two core wires in parallel to form an inner sheath layer through an insulation extrusion process. There is a cavity in the middle of the core wire after two extrusion processes. After the insulation layer of the inner core wire and the outer sheath insulation layer are subjected to high temperature and bending experiments, the inner sheath and the core wire are prone to deformation, resulting in unqualified SI high-frequency performance and causing wire defects. CONTENT OF THE UTILITY MODEL

[0003] In order to solve the above technical problems, the present application provides a high-temperature-resistant and bending-resistant parallel high-speed transmission cable, which comprises two conductors, an insulation layer completely covering the two conductors, a first shielding layer and a second shielding layer wrapped around the outer periphery of the insulation layer, and a hot melt PET polyester tape spirally wrapped around the outer periphery of the second shielding layer.

[0004] Preferably, the second shielding layer is wrapped around the first shielding layer in a first direction, and the hot melt PET polyester tape is wrapped around the second shielding layer in a second direction.

[0005] Preferably, an ink layer is formed on the upper surface of the hot melt PET polyester tape.

[0006] Preferably, the first shielding layer is formed by wrapping, the second shielding layer is formed by wrapping, and the first shielding layer and the second shielding layer are made of any one of aluminum foil, copper foil, silver foil, gold foil and tin foil.

[0007] Preferably, the cross section of the insulation layer is elliptical, and the two conductors are located at the two focal points of the elliptical cross section.

[0008] From the above, the application can obtain the following beneficial effects: the insulating layer is fully coated on the outer periphery of the parallel conductors, and the first shielding layer and the second shielding layer are sequentially coated on the outer periphery of the insulating layer. The insulating layer is coated on all the conductors by one-time extrusion molding, and the first shielding layer and the second shielding layer are fully in contact, so that there is no cavity inside the cable, the insulating layer is one-time molded and has stability, and is not easy to deform in high temperature and bending experiments, ensuring the structural stability and temperature resistance. The hot melt PET polyester tape is spirally wrapped on the outer periphery of the second shielding layer, and the hot melt PET polyester tape is hot-melt attached to the second shielding layer, so that the internal structure is stable and not easy to deform, and the SI high-frequency performance of the cable is ensured under the environment of 105 DEG C high temperature and bending. BRIEF DESCRIPTION OF DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are only part of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0010] Figure 1 The structure diagram of the high-temperature-resistant and bending-resistant parallel high-speed transmission cable of the embodiment of the present application.

[0011] Figure 2 The structure diagram of the high-temperature-resistant and bending-resistant parallel high-speed transmission cable of the embodiment of the present application. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0013] EMBODIMENT

[0014] In order to solve the above technical problems, the embodiment provides a high-temperature-resistant and bending-resistant parallel high-speed transmission cable, which comprises Figure 1As shown, the cable includes at least two parallel conductors 10, an insulation layer 20 covering all the conductors 10, a first shielding layer 30 and a second shielding layer 40 wrapped around the outer periphery of the insulation layer 20 in sequence. The insulation layer 20 is wrapped around all the conductors 10 by one-time extrusion molding, and the metal surfaces of the first shielding layer 30 and the second shielding layer 40 are in contact. The insulation layer 20 has an elliptical cross-section, and the two conductors 10 are located at the two focal points of the elliptical cross-section. It should be noted that in this way, by arranging the center conductor at the focal point of the ellipse, the cable has a symmetrical structure and is also a parallel line pair structure, so that the mutual interference between the two center conductors is smaller, and the transmitted signal is faster and more stable. And by arranging the elliptical structure, the structure of the cable is more flat, realizing high-speed transmission of high frequency. At the same time, the one-time molding of the insulation layer makes the conductors 10 inside the cable have no cavity, and the one-time molding of the insulation layer has stability and is not easy to deform in high temperature and bending experiments, ensuring the structural stability. Then the hot melt PET polyester tape 50 is spirally wrapped around the outer periphery of the second shielding layer 40, and the hot melt PET polyester tape 50 is hot-melted and attached to the second shielding layer 40, so that the internal structure is stable and not easy to deform, and the high-frequency performance of the cable SI is ensured under the environment of 105°C high temperature and bending.

[0015] Specifically, the second shielding layer 40 is wrapped around the first shielding layer 30 along a first direction, and the hot melt PET polyester tape 50 is wrapped around the second shielding layer 40 along a second direction. The first direction is opposite to the second direction. The first shielding layer 30 is a metal tape, and a layer of metal shielding tape is laid flat around the outer periphery of the insulation layer 20 to form the first shielding layer 30. Then a layer of metal shielding tape is spirally wrapped around the first shielding layer 30 to form the second shielding layer 40. The double shielding structure ensures that the signal transmission of the cable will not be disturbed.

[0016] Further, in some embodiments, the first shielding layer 30 and the second shielding layer 40 are metal shielding layers, and the first shielding layer 30 and the second shielding layer 40 adopt any one of aluminum foil, copper foil, silver foil, gold foil and tin foil. Further, the metal surface of the first shielding layer 30 is in contact with the metal surface of the second shielding layer 40. After the second shielding layer 40 is wrapped around the first shielding layer 30 along the first direction, the hot melt PET polyester tape 50 is wrapped around the second shielding layer 40 along the second direction, so as to play a shielding protection role for the cable.

[0017] In high temperature and bending working conditions, the cavity existing in the cable will expand, causing the internal structure to be loose, thereby affecting the performance of the cable. Therefore, the insulating layer 20 is covered on all the conductors 10 by one-time extrusion molding, avoiding the problem of existing cavity between the two core wires after extruding the insulating layer outside the two core wires, and the hot melt PET polyester tape 50 is attached to the second shielding layer 40, and the hot melt PET polyester tape 50 is reversely wrapped on the second shielding layer 40, so that the internal structure of the cable is compact and stable, and there is no cavity inside, and the hot melt PET polyester tape 50 can resist 105° high temperature, so that the wire can resist 105° high temperature. Wherein, the printing layer 51 is formed on the upper surface of the hot melt PET polyester tape 50, which facilitates the printing of the wire type.

[0018] Further, the structure of the present application can realize impedance control by adjusting the distance between the two center conductors. The differential mode impedance increases with the increase of the conductor distance, the inner coating height and the width, and the common mode impedance decreases with the increase of the conductor distance and increases with the increase of the inner coating height and the width. In the existing parallel structure of the double core wire, due to the influence of the thickness of the core wire insulating layer, the distance between the two core wires is difficult to control, and the process tolerance of the conductor distance is controlled within 0.01mm, which can cause a difference of 2.6ohm in impedance. While in the present embodiment, the distance between the conductors can be accurately controlled when the insulating layer 20 is one-time extrusion molded, thereby realizing the control of the differential mode impedance and the common mode impedance, and improving the performance of the wire.

[0019] Further, in some embodiments, the first shielding layer 30 is an aluminum foil, the second shielding layer 40 is formed by interlaced winding of tinned alloy hard copper wire and copper foil tape, and the second shielding layer 40 is wrapped around the first shielding layer 30 along the first direction, and then the hot melt PET polyester tape 50 is wrapped around the second shielding layer 40 along the second direction. While playing a shielding protection role for the cable, the second shielding layer 40 can improve the bending strength of the cable, and ensure that the transmission performance of the conductor 10 will not decrease under the bending working condition.

[0020] Further, in order to improve the high temperature resistance and fireproof characteristics of the cable, in some embodiments, as shown in Figure 2 a layer of fireproof nylon layer 60 is extruded on the hot melt PET polyester tape 50, which makes the cable have the characteristics of wear resistance, scratch resistance, fire resistance and corrosion resistance, and improves the service life of the cable.

[0021] In summary, the application is provided by the parallel arrangement of the conductor outer comprehensive coating with an insulating layer, the outer insulating layer is coated with a first shielding layer and a second shielding layer. The insulating layer is coated on all conductors by one-time extrusion forming, and the first shielding layer and the second shielding layer are fully contacted, so that there is no cavity inside the cable, the insulating layer is one-time formed and has stability, and is not easy to deform in high temperature and bending experiment, ensuring the structural stability, and the hot melt PET polyester tape is spirally wrapped around the outer periphery of the second shielding layer, and is hot melt attached to the second shielding layer, so that the internal structure is stable and not easy to deform, and the SI high frequency performance of the cable is ensured under the environment of 105 DEG C high temperature and bending.

[0022] The above-mentioned embodiments do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principles of the above-mentioned embodiments shall be included in the protection scope of the technical solution.

Claims

1. A high temperature resistant, kink resistant, parallel, high speed transmission cable, characterized by: The cable comprises at least two parallel conductors (10), an insulation layer (20) covering all the conductors (10), a first shielding layer (30) and a second shielding layer (40) covering the periphery of the insulation layer (20), the first shielding layer (30) and the second shielding layer (40) being in full contact, and the insulation layer (20) being formed by one-time extrusion to completely cover all the conductors (10), so that there is no cavity inside the cable, and a hot-melt PET polyester tape (50) is spirally wrapped around the periphery of the second shielding layer (40).

2. The high temperature, high speed, flexible, parallel cable of claim 1, wherein: The second shielding layer (40) is wrapped around the first shielding layer (30) along a first direction, and the hot-melt PET polyester tape (50) is wrapped around the second shielding layer (40) along a second direction.

3. The high temperature, high speed, flexible, parallel cable of claim 1, wherein: An ink layer (51) is formed on the upper surface of the hot-melt PET polyester tape (50).

4. The high temperature, high speed, flexible, parallel cable of claim 2, wherein: The first shielding layer (30) is formed by dragging, the second shielding layer (40) is formed by wrapping, and the first shielding layer (30) and the second shielding layer (40) are made of any one of aluminum foil, copper foil, silver foil, gold foil and tin foil.

5. The high temperature, bend-insensitive, high speed parallel cable of claim 1, wherein: the cable is a Category 6A cable. The cross section of the insulation layer (20) is elliptical, and the two conductors (10) are located at the two focal points of the elliptical cross section.

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