Data bus cable

Abstract

The utility model discloses a data bus cable, which relates to the technical field of cables and comprises a cable core, the cable core comprises conductors which are arranged side by side and made of silver-plated copper alloy materials, a foaming FEP insulating layer is extruded outside each conductor, an inner shielding layer made of silver-plated copper wires is woven outside the cable core, and an outer shielding layer made of silver-plated copper wires is woven outside the inner shielding layer. A sheath made of an ETFE material is extruded outside the outer shielding layer, and an isolation structure is arranged between the foaming FEP insulating layer and the inner shielding layer. According to the utility model, the conductor is made of the silver-plated copper alloy material, so that the cost is reduced, the good conductive performance of the conductor can be ensured, the temperature adaptation range of the whole cable can be wider in cooperation with the materials of the inner shielding layer, the outer shielding layer and the sheath, the stability of the whole cable can be ensured by the isolation structure, and the two cables in the cable cannot be misplaced.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to a data bus cable. Background Technology

[0002] Research revealed that existing data bus cables are difficult to use in harsh environments to provide high-reliability transmission, especially for signal transmission in the demanding environments of aviation and electronics. Furthermore, low-density PTFE is a unidirectional shaped material with poor lateral strength. If it is wrapped, the PTFE is easily subjected to wrapping pressure during the process, which causes changes in its specific gravity and corresponding dielectric constant.

[0003] Therefore, it is necessary to combine foreign product specifications and user needs, fully consider their applicability and security, and in order to meet the high-tech, high-quality, and high-performance requirements of modern military equipment and modern technology, promote the localization of aerospace data buses, replace imports, and design a new data bus cable to meet the above requirements. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a data bus cable that solves the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A data bus cable includes a cable core, the cable core including silver-plated copper alloy conductors arranged side by side, each conductor being extruded with a foamed FEP insulation layer;

[0007] The cable core is woven with an inner shielding layer made of silver-plated copper wire, and an outer shielding layer made of silver-plated copper wire is woven outside the inner shielding layer. The outer shielding layer is extruded with an ETFE sheath.

[0008] An isolation structure is provided between the foamed FEP insulation layer and the inner shielding layer.

[0009] The first type of isolation structure is as follows: The isolation structure includes a filling core with a circular cross-section, which is tangent to the foamed FEP insulation layer and the inner shielding layer, respectively.

[0010] The second type of isolation structure is as follows: The isolation structure includes an isolation sleeve, which is fixed inside the inner shielding layer. Two cable cores are fixed inside the isolation sleeve. The isolation sleeve is a figure-eight shaped sleeve, and the two cable cores are respectively fixed in the two holes of the isolation sleeve. The inner shielding layer, the outer shielding layer, and the sheath are all figure-eight shaped.

[0011] Compared with the prior art, this utility model has the following advantages: the conductor is made of silver-plated copper alloy, which not only reduces costs but also ensures good conductivity. Combined with the materials of the inner shielding layer, outer shielding layer and sheath, the temperature adaptability range of the entire cable is wider. The isolation structure can ensure the stability of the entire cable and prevent the two internal cables from becoming misaligned. Attached Figure Description

[0012] Figure 1 This is a sectional view of the main view of Embodiment 1 of this utility model;

[0013] Figure 2 This is a sectional view of the main view of Embodiment 2 of this utility model;

[0014] Figure 3 This is a sectional view of the main view of the isolation sleeve of this utility model.

[0015] Reference numerals: 1. Conductor; 2. Foamed FEP insulation layer; 3. Inner shielding layer; 4. Outer shielding layer; 5. Sheath; 6. Filler core; 7. Isolation sleeve. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] like Figure 1-3 As shown, this utility model provides a data bus cable, including Embodiment 1 and Embodiment 2. The two embodiments are described below.

[0018] Example 1 includes a cable core, which comprises parallel silver-plated copper alloy conductors 1. Specifically, conductor 1 is 19 / 0.107mm thick. To reduce the attenuation of the twisted-pair shielded cable, high-strength silver-plated copper alloy wire is used as conductor 1. Based on the high-frequency skin effect, the silver plating thickness of the high-strength silver-plated copper alloy wire is determined according to the transmission frequency requirements, using a 1μm silver layer thickness. Taking into full consideration the stringent performance requirements of the twisted-pair shielded cable, especially the requirements for transmission rate, attenuation, and operating temperature range, each conductor 1 is extruded with a foamed FEP insulation layer 2. Foamed FEP insulation layer 2 was chosen because it is a high-performance insulation material with a wide long-term operating temperature range of -200 to 200°C and a low dielectric constant (1.8 to 2.2), resulting in lower dielectric attenuation and thus reducing the attenuation of the twisted-pair shielded cable.

[0019] The cable core is braided with an inner shielding layer 3 made of silver-plated copper wire, and the inner shielding layer 3 is braided with an outer shielding layer 4 made of silver-plated copper wire. The outer shielding layer 4 is extruded with an ETFE sheath 5. The sheath 5 must meet the requirements for high and low temperature resistance and radiation resistance. Generally, cross-linked ethylene-tetrafluoroethylene copolymer (XETFE) and ethylene-tetrafluoroethylene copolymer (ETFE) have outstanding radiation resistance.

[0020] An isolation structure is provided between the foamed FEP insulation layer 2 and the inner shielding layer 3. The isolation structure includes a filling core 6 with a circular cross-section, which is tangent to both the foamed FEP insulation layer 2 and the inner shielding layer 3.

[0021] Example 2 includes a cable core, which includes silver-plated copper alloy conductors 1 arranged side by side, and each conductor 1 is covered with a foamed FEP insulation layer 2.

[0022] The cable core is braided with an inner shielding layer 3 made of silver-plated copper wire, the inner shielding layer 3 is braided with an outer shielding layer 4 made of silver-plated copper wire, and the outer shielding layer 4 is extruded with an ETFE sheath 5.

[0023] An isolation structure is provided between the foamed FEP insulation layer 2 and the inner shielding layer 3. The isolation structure includes an isolation sleeve 7, which is fixed inside the inner shielding layer 3. Two cable cores are fixed inside the isolation sleeve 7. The isolation sleeve 7 is a figure-eight shaped sleeve, and the two cable cores are respectively fixed in the two holes of the isolation sleeve 7. The inner shielding layer 3, the outer shielding layer 4, and the sheath 5 are all figure-eight shaped. The overall design of Embodiment 2 makes the entire cable occupy less space, and the contact area between the cable core and the inner shielding layer 3 is larger, making the fixation of the cable core more stable and less likely to cause the two cable cores to misalign.

[0024] Since this twisted-pair shielded cable will be used for differential signal transmission, the synchronicity of the two signals transmitted in the two cores determines the effectiveness of the differential signal transmission. Therefore, the electrical length between the two cores in this twisted-pair shielded cable must be consistent to ensure that the transmission delay difference of the differential signal between the two is small. Under the condition of consistent structure and materials, the electrical length of the two cores will depend on their physical length. If the physical lengths of the two wires are inconsistent, it will lead to inconsistent transmission times of the two signals in the two cores, that is, a large delay difference, which will eventually lead to signal distortion. Only when the physical lengths of the two cores are highly consistent can the time delay difference of the cable meet the design requirements of this twisted-pair shielded cable. The better the symmetry of the two cores when twisted, the better the consistency of their physical lengths, and the better the synchronicity of the transmitted signals. The symmetry of the two cores when twisted includes two aspects: the consistency of the outer diameter and dielectric constant of the two cores and the consistency of the twisted structure. The former is guaranteed by the above-mentioned precision extrusion process, and the latter is determined by the twisting process.

[0025] The entire cable has the following specifications: 1MHz, characteristic impedance 77Ω±5Ω, attenuation ≤4.59dB / 100m (1.0MHz), propagation frequency 80%, working capacitance (1.0MHz): 59pF / m, and weight ≤24.7g / m.

[0026] Finally, the most significant contribution of this invention is that conductor 1 is made of silver-plated copper alloy, which not only reduces costs but also ensures good conductivity. Combined with the materials of the inner shielding layer 3, outer shielding layer 4, and sheath 5, the temperature adaptability range of the entire cable is wider, and the isolation structure ensures the stability of the entire cable, preventing misalignment between the two internal cables.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A data bus cable, characterized in that: The cable core consists of silver-plated copper alloy conductors arranged side by side, each conductor being extruded with a foamed FEP insulation layer. The cable core is woven with an inner shielding layer made of silver-plated copper wire, and an outer shielding layer made of silver-plated copper wire is woven outside the inner shielding layer. The outer shielding layer is extruded with an ETFE sheath. An isolation structure is provided between the foamed FEP insulation layer and the inner shielding layer.

2. The data bus cable according to claim 1, characterized in that: The isolation structure includes a circular filler core, which is tangent to the foamed FEP insulation layer and the inner shielding layer, respectively.

3. A data bus cable according to claim 1, characterized in that: The isolation structure includes an isolation sleeve, which is fixed inside the inner shielding layer, and two cable cores are fixed inside the isolation sleeve.

4. A data bus cable according to claim 3, characterized in that: The isolation sleeve is a figure-eight shaped sleeve, with the two cable cores fixed in the two holes of the isolation sleeve respectively.

5. A data bus cable according to claim 4, characterized in that: The inner shielding layer, outer shielding layer, and sheath are all figure-eight shaped.

Images