Data bus cable

Abstract

The utility model provides a data bus cable. The data bus cable comprises a filling core; the four core wires are arranged on the outer edge of the filling core in a star-quad structure; the inner protective layer is coated on the four core wires; the inner shielding layer wraps the inner protection layer, and the inner shielding layer is a silver-plated copper wire braid layer or a silver-plated copper strip braid layer or a metallized fiber braid layer; and the outer shielding layer wraps the inner shielding layer, and the outer shielding layer is a metalized fiber braid layer. According to the data bus cable, the inner shielding layer is the silver-plated copper wire braid layer or the silver-plated copper strip braid layer or the metallized fiber braid layer, the outer shielding layer is the metallized fiber braid layer, and the density of metallized fibers is smaller than that of silver-plated copper, so that the data bus cable is light in weight after being formed.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a data bus cable. Background Art

[0002] With the development of highly integrated avionics technology, in order to meet the requirements of the new generation of equipment for high bandwidth, high reliability and low latency, 1394B data bus cable was developed and used. The 1394B data bus cable can meet the requirements of high and low temperature, flexibility, easy installation, high bandwidth, low loss, small outer diameter and light weight.

[0003] In the prior art, the inner shielding layer and the outer shielding layer of the 1394B data bus cable are made of silver-plated copper tape or silver-plated copper wire braided layer. However, due to the high density of silver-plated copper, the weight of the formed 1394B data bus cable is heavy. Utility Model Content

[0004] The present application mainly provides a data bus cable to solve the technical problem of heavy weight of the molded 1394B data bus cable in the prior art.

[0005] In order to solve the above technical problems, the present application provides a data bus cable, including: a filling core; four core wires, the four core wires are arranged in a star-twisted structure at the outer edge of the filling core; an inner sheath, covering the four core wires; an inner shielding layer, covering the inner sheath, the inner shielding layer is a silver-plated copper wire braided layer or a silver-plated copper tape braided layer or a metallized fiber braided layer; an outer shielding layer, covering the inner shielding layer, the outer shielding layer is a metallized fiber braided layer.

[0006] In one embodiment, the braiding density of the silver-plated copper wire braided layer, the silver-plated copper tape braided layer and the metallized fiber braided layer is greater than or equal to 85%.

[0007] In one embodiment, each of the core wires includes an inner conductor and an insulating layer. The inner conductors are multiple in number, the multiple inner conductors are concentrically twisted, and the insulating layer is coated on the multiple inner conductors.

[0008] In one embodiment, a twisted outer diameter of the plurality of inner conductors is greater than or equal to 0.30 mm and less than or equal to 0.85 mm, and a twisted pitch ratio of the plurality of inner conductors is greater than or equal to 8 and less than or equal to 20.

[0009] In one embodiment, the insulating layer includes a microporous polytetrafluoroethylene tape and a polytetrafluoroethylene raw tape, the microporous polytetrafluoroethylene tape is coated on the plurality of inner conductors, and the polytetrafluoroethylene raw tape is coated on the microporous polytetrafluoroethylene tape.

[0010] In one embodiment, the density of the microporous polytetrafluoroethylene tape is 0.5 to 1.0 g / cm 3 .

[0011] In one embodiment, the inner protective layer is a microporous polytetrafluoroethylene sheath.

[0012] In one embodiment, the microporous polytetrafluoroethylene wrapping layer has a wrapping overlap ratio greater than or equal to 30%.

[0013] In one embodiment, a twisted pitch ratio of the four core wires is greater than or equal to 6 and less than or equal to 20.

[0014] In one embodiment, the data bus cable further comprises a sheath, wherein the sheath is coated on the outer shielding layer.

[0015] The beneficial effects of the present application are as follows: the inner shielding layer of the data bus cable provided by the present application is a silver-plated copper wire braided layer, a silver-plated copper tape braided layer, or a metallized fiber braided layer, and the outer shielding layer is a metallized fiber braided layer. Since the density of the metallized fiber is less than the density of the silver-plated copper, the data bus cable provided by the present application is lighter after molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the implementation modes of the present application, the drawings required for use in the description of the implementation modes will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a cross-sectional schematic diagram of a data bus cable in one embodiment of the present application. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is particularly noted that the following implementation methods are only used to illustrate the present application, but do not limit the scope of the present application. Similarly, the following implementation methods are only some implementation methods of the present application rather than all implementation methods. All other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0019] The terms "first", "second" and "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, and the mode is such as two, three, etc., unless otherwise clearly defined and optional. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. The mode, such as a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0020] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] See also Figure 1 The present application provides a data bus cable 10, which includes a filling core 100, four core wires 200, an inner sheath 300, an inner shielding layer 400 and an outer shielding layer 500. The four core wires 200 are arranged at the outer edge of the filling core 100 in a star-twisted structure, and the inner sheath 300 is coated on the four core wires 200; the inner shielding layer 400 is coated on the inner sheath 300, and the inner shielding layer 400 is a silver-plated copper wire braided layer or a silver-plated copper tape braided layer or a metallized fiber braided layer; the outer shielding layer 500 is coated on the inner shielding layer 400, and the outer shielding layer 500 is a metallized fiber braided layer. Compared with the prior art, the inner shielding layer 400 of the data bus cable 10 provided in the present application is a silver-plated copper wire braided layer, a silver-plated copper tape braided layer, or a metallized fiber braided layer, and the outer shielding layer 500 is a metallized fiber braided layer. Since the density of the metallized fiber is less than the density of the silver-plated copper, the data bus cable 10 provided in the present application is lighter after molding.

[0022] Optionally, the filling core 100 is made of polytetrafluoroethylene.

[0023] Optionally, the four core wires 200 are twisted with the filling core 100 as the center, the twisting direction is left, the twisting pitch ratio is greater than or equal to 6 and less than or equal to 20, and the red core wire is diagonally positioned with the green core wire, and the blue core wire is diagonally positioned with the orange core wire. The four core wires 200 are divided into two pairs, the distance between each pair of core wires 200 is consistent, the structure is stable, and the consistency of the signal transmission of the two pairs is ensured.

[0024] Optionally, each core wire 200 includes an inner conductor 210 and an insulating layer 220 . There are multiple inner conductors 210 . The multiple inner conductors 210 are concentrically twisted, and the insulating layer 220 is coated on the multiple inner conductors 210 .

[0025] Optionally, the inner conductor 210 is a silver-plated copper or a high-strength silver-plated copper alloy conductor, the twisting specification of the multiple inner conductors 210 is 19×0.127mm, the coating thickness is 2μm, the multiple inner conductors 210 should be concentrically twisted, and the twisting direction should be the same or opposite direction of the inner and outer layers. The twisted outer diameter is greater than or equal to 0.30mm and less than or equal to 0.85mm, and the twisted pitch diameter ratio is greater than or equal to 8 and less than or equal to 20.

[0026] Optionally, the insulating layer 220 includes a microporous polytetrafluoroethylene tape 221 and a polytetrafluoroethylene raw tape 222 , the microporous polytetrafluoroethylene tape 221 is coated on the plurality of inner conductors 210 , and the polytetrafluoroethylene raw tape 222 is coated on the microporous polytetrafluoroethylene tape 221 .

[0027] Optionally, the insulating layer 220 is formed by wrapping a microporous polytetrafluoroethylene tape 221 and a polytetrafluoroethylene raw tape 222 and sintering at a high temperature to increase the mechanical strength of the insulating layer 220 .

[0028] Optionally, the microporous polytetrafluoroethylene tape 221 is insulated and wrapped in two layers, and the density of the first microporous polytetrafluoroethylene layer is 0.5-1.0 g / cm 3 , a second layer of polytetrafluoroethylene raw tape 222.

[0029] Optionally, the inner protective layer is a microporous polytetrafluoroethylene wrapping layer, and the wrapping coverage rate of the microporous polytetrafluoroethylene wrapping layer should be not less than 30%. The density of the microporous polytetrafluoroethylene is 0.5g / cm 3 The overlap rate is 30%, and the wrapping diameter is: Nom3.65mm.

[0030] Optionally, the inner shielding layer 400 is a silver-plated copper wire braided layer, and the outer shielding layer 500 is a metallized fiber braided layer, and the braiding density of the silver-plated copper wire braided layer and the metallized fiber braided layer are both greater than or equal to 85%.

[0031] Optionally, the inner shielding layer 400 is a silver-plated copper tape braided layer, the outer shielding layer 500 is a metallized fiber braided layer, and the braiding density of the silver-plated copper tape braided layer and the metallized fiber braided layer are both greater than or equal to 85%.

[0032] Optionally, the inner shielding layer 400 is a metallized fiber braided layer, the outer shielding layer 500 is a metallized fiber braided layer, and the braiding density of the two metallized fiber braided layers is greater than or equal to 85%.

[0033] Optionally, the data bus cable 10 further comprises a sheath 600 , wherein the sheath 600 is coated on the outer shielding layer 500 , and the sheath 600 is made of a poly(perfluoroethylene)propylene) material extruded through a thin wall by a high-temperature extruder.

[0034] The weight of the data bus cable 10 after molding is less than 37 g / m. Compared with the existing data bus cable with a weight of 47.2 g / m, the weight of the data bus cable 10 is reduced by more than 21%.

[0035] Compared with the prior art, the inner shielding layer 400 of the data bus cable 10 provided in the present application is a silver-plated copper wire braided layer, a silver-plated copper tape braided layer, or a metallized fiber braided layer, and the outer shielding layer 500 is a metallized fiber braided layer. Since the density of the metallized fiber is less than the density of the silver-plated copper, the data bus cable 10 provided in the present application is lighter after molding.

[0036] The above description is only part of the implementation methods of the present application, and does not limit the protection scope of the present application. Any equivalent device or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A data bus cable, characterized in that: include: Filling core; Four core wires, the four core wires are arranged at the outer edge of the filling core in a star-twisted structure; An inner sheath covering the four core wires; An inner shielding layer, coated on the inner protective layer, wherein the inner shielding layer is a silver-plated copper wire braided layer, a silver-plated copper tape braided layer, or a metallized fiber braided layer; The outer shielding layer is coated on the inner shielding layer, and the outer shielding layer is a metallized fiber braided layer.

2. The data bus cable according to claim 1, characterized in that The braiding density of the silver-plated copper wire braided layer, the silver-plated copper tape braided layer and the metallized fiber braided layer is greater than or equal to 85%.

3. The data bus cable according to claim 1, characterized in that Each of the core wires comprises an inner conductor and an insulating layer. There are multiple inner conductors, and the multiple inner conductors are concentrically twisted. The insulating layer is coated on the multiple inner conductors.

4. The data bus cable according to claim 3, characterized in that The twisted outer diameter of the plurality of inner conductors is greater than or equal to 0.30 mm and less than or equal to 0.85 mm, and the twisted pitch ratio of the plurality of inner conductors is greater than or equal to 8 and less than or equal to 20.

5. The data bus cable according to claim 3, characterized in that The insulating layer comprises a microporous polytetrafluoroethylene tape and a polytetrafluoroethylene raw tape. The microporous polytetrafluoroethylene tape is coated on the plurality of inner conductors, and the polytetrafluoroethylene raw tape is coated on the microporous polytetrafluoroethylene tape.

6. The data bus cable according to claim 5, characterized in that The density of the microporous polytetrafluoroethylene tape is 0.5-1.0 g / cm 3 .

7. The data bus cable according to claim 1, characterized in that The inner protective layer is a microporous polytetrafluoroethylene sheath.

8. The data bus cable according to claim 7, characterized in that The wrapping overlap rate of the microporous polytetrafluoroethylene wrapping layer is greater than or equal to 30%.

9. The data bus cable according to claim 1, characterized in that The twisted pitch ratio of the four core wires is greater than or equal to 6 and less than or equal to 20.

10. The data bus cable according to claim 1, characterized in that The data bus cable further comprises a sheath, wherein the sheath is coated on the outer shielding layer.

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