High-tensile light data cable

Abstract

The utility model relates to the technical field of data cables, and discloses a high tensile light-weight data cable, which comprises a plurality of conductors, an aramid fiber filling core and a light-weight shielding layer, the plurality of conductors are uniformly distributed between the aramid fiber filling core and the light-weight shielding layer, the aramid fiber filling core comprises a central core wire and an outer wrapping layer, and the outer wrapping layer is arranged between the central core wire and the light-weight shielding layer. The light shielding layer comprises an inner shielding layer and an outer shielding layer. According to the utility model, the defects in the prior art are overcome, the purpose of high impedance is realized on the basis of not changing the original insulation structure by properly reducing the outer diameter of the conductor, the problem that the tensile strength of the conductor is reduced is solved by matching the aramid fiber filling core, and the aramid fiber filling core consists of the central core wire and the outer wrapping layer, the central core wire is made of aramid fiber materials, the outer wrapping layer adopts a plastic extrusion wrapping mode, a certain filling effect can be achieved, large tensile resistance can be achieved, and the light shielding layer is composed of an inner shielding layer and an outer shielding layer.

Description

Technical Field

[0001] The utility model relates to the technical field of data cables, and more specifically to a high-tensile-resistance light data cable. Background Art

[0002] Aerospace data cables are used as data transmission cables and are widely used in military equipment such as satellites, rockets, and military aircraft. In addition, the transmission rate and lightweight requirements for data signals in aerospace systems are becoming increasingly higher, and the demand for lightweight and high-performance data cables is also increasing.

[0003] Deficiencies of the existing technology: Under the existing technology, if you want to make the cable have a larger impedance, without affecting the overall outer diameter and weight, you can reduce the outer diameter of the conductor, reduce the dielectric constant of the insulating material, etc., but the dielectric constant of the insulating material is relatively fixed, and it is not easy to obtain insulating materials with low dielectric constants. Therefore, reducing the outer diameter of the conductor is a feasible method, but reducing the outer diameter of the conductor or using a smaller wire gauge will result in the disadvantage of reduced tensile strength of the conductor. At this time, alloy solutions are generally used to solve this problem, but the selection of alloys will introduce adverse effects such as increased product costs and poor attenuation performance.

[0004] In addition, the traditional data cable filling core is generally in the form of solid plastic extrusion, which can meet a certain filling effect, but if it is used to solve the problem of insufficient conductor strength, customized design is required, which is more troublesome. In addition, the existing data cable shielding methods include metal tape wrapping, metal wire braiding, flat metal braiding and other methods. The metal tape wrapping shielding has better shielding effect than the metal wire braiding shielding, but its disadvantage is that it is difficult to bend and has poor flexibility. It is only suitable for use in situations with large distances and large bending radii. The metal wire braiding has good flexibility, but the outer diameter of the braided metal wire is thicker, which will increase the overall weight and outer diameter of the cable. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the utility model provides a high-tensile-resistance lightweight data cable to solve the problems existing in the above-mentioned background technology.

[0006] The utility model provides the following technical solution: a high-tensile-resistance light data cable, comprising a conductor, an aramid filling core and a light shielding layer, wherein a plurality of the conductors are arranged and the plurality of the conductors are evenly distributed between the aramid filling core and the light shielding layer.

[0007] The aramid filling core comprises a central core wire and an outer wrapping layer, and the light shielding layer comprises an inner shielding layer and an outer shielding layer.

[0008] Preferably, the central core wire is made of aramid material, and the outer wrapping layer is formed by plastic extrusion.

[0009] Preferably, the inner shielding layer is formed by flat metal braiding, and the outer shielding layer is made of a new lightweight metal-coated aramid material.

[0010] Technical effects and advantages of the utility model:

[0011] The utility model solves the deficiencies of the prior art and achieves the goal of high impedance without changing the original insulation structure by appropriately reducing the outer diameter of the conductor. In order to solve the problem of reduced tensile strength of the conductor, an aramid filling core is used in combination. The aramid filling core consists of a central core wire and an outer wrapping layer. The central core wire is made of aramid material, and the outer wrapping layer is in the form of plastic extrusion coating, which can not only meet a certain filling effect, but also achieve a greater tensile strength. The light shielding layer consists of an inner shielding layer and an outer shielding layer. The inner shielding layer is made of flat metal braiding, which is soft and thin, and its planar structure can also slightly improve the attenuation performance of the cable. The outer shielding layer is made of a new lightweight metal-plated aramid material, which reduces the overall weight of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0013] The reference numerals are: 1. conductor; 2. aramid filling core; 3. light shielding layer. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The high-tensile lightweight data cable involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0015] The utility model provides a high-tensile light data cable, comprising a conductor 1, an aramid filling core 2 and a light shielding layer 3. A plurality of conductors 1 are arranged, and the plurality of conductors 1 are evenly distributed between the aramid filling core 2 and the light shielding layer 3.

[0016] The impedance matching problem is an important aspect in the integrity analysis of high-speed signal transmission. Impedance control is a necessary condition to ensure that the waveform of high-speed signals is not distorted during transmission, and impedance matching is an important means to ensure that high-speed signals are not reflected at the receiving end and are correctly received. As an effective carrier of high-speed signals, differential data lines are particularly critical to achieve impedance control and matching. Differential impedance refers to the impedance encountered when electromagnetic waves propagate along uniform cable lines without reflection, that is, the ratio of the voltage wave to the current wave at any point in the line when the line terminals are matched, which is the differential impedance of the line. The differential impedance of the bus cable must match the terminal load. If the impedance does not match, the signal will be reflected and the attenuation will increase. Therefore, differential impedance is the main technical indicator of cable structure design. The theoretical calculation formula of cable differential impedance is:

[0017]

[0018] In the formula, d is the diameter of the conductor inside the stranded wire (mm); a is the center distance between the two conductors (mm); r is the equivalent relative dielectric constant of the insulation; K1 is the effective diameter coefficient of the conductor; K3 is the coefficient caused by braiding, which is generally taken as 0.98; D is the inner diameter of the shield in mm.

[0019] For 1394 transmission protocol (differential impedance 110Ω), CAN bus transmission protocol (differential impedance 120Ω) and other special data cables with differential impedance of 150Ω or even higher, if you want to obtain a larger impedance, you can reduce the outer diameter of the conductor, reduce the dielectric constant of the insulating material, etc. without affecting the overall outer diameter and weight. However, the dielectric constant of the insulating material is relatively fixed, and it is not easy to obtain insulating materials with low dielectric constants. Therefore, reducing the outer diameter of the conductor is a feasible method. However, reducing the outer diameter of the conductor or using a smaller wire gauge will result in a decrease in the tensile strength of the conductor. At this time, alloy solutions are generally used to solve this problem, but the selection of alloys will introduce adverse effects such as increased product costs and poor attenuation performance.

[0020] Therefore, the utility model achieves the goal of high impedance by appropriately reducing the outer diameter of the conductor 1 without changing the original insulation structure. In order to solve the problem of reduced tensile strength of the conductor 1, an aramid filling core 2 is used in combination.

[0021] The aramid filling core 2 comprises a central core wire and an outer covering layer.

[0022] There is a certain gap in the center of two-core or multi-core data cables when they are cabled, and the appearance cannot be round and tight after cabling. The insulation is wrapped with a film. Compared with the extruded insulation layer, the insulation skin is softer, so it is easy to be squeezed and deformed by each other. When the insulation is deformed, the outer diameter will change, and this change may occur randomly, which will cause the differential impedance of the product to change, generate standing waves, and affect the quality of signal transmission. Therefore, filling cores are added when two-core or multi-core data cables are cabled to ensure the structural stability of the cable with buffering and supporting functions.

[0023] The traditional filling core of data cable is generally in the form of solid plastic extrusion, which can meet a certain filling effect, but if it is to solve the problem of insufficient conductor strength, customized design is required.

[0024] The central core wire of the aramid filling core 2 of the utility model is made of aramid material, and the outer wrapping layer is in the form of plastic extrusion coating, which can not only meet a certain filling effect, but also achieve a greater tensile strength.

[0025] Aramid is a high-tech synthetic fiber with high strength, high modulus, high temperature resistance, acid and alkali resistance, and light weight. Its strength is 5-6 times that of steel wire, its modulus is 2-3 times that of steel wire, and its toughness is 2 times that of steel wire, but its weight is only about 1 / 5 of that of steel wire.

[0026] The plastic coating of the outer sheath layer can be selected based on the overall use temperature or environment of the data cable, including but not limited to PE, FEP, PFA, X-ETFE, etc.

[0027] The light shielding layer 3 comprises an inner shielding layer and an outer shielding layer. The inner shielding layer adopts flat metal braiding, and the outer shielding layer adopts a new type of lightweight metal-coated aramid material.

[0028] The light shielding layer 3 has two functions. On the one hand, it serves as the zero potential of the differential signal, and on the other hand, it prevents external shielding interference.

[0029] In high-frequency usage environments, signal crosstalk between electronic devices will cause signal distortion when the cable transmits data, making it impossible to transmit effectively. Therefore, the quality and stability of the transmission signal are largely determined by the communication circuit's ability to defend against external interference and mutual interference. In order to reduce mutual interference and external interference between cable loops, the most fundamental way is to use a shielding structure in the cable.

[0030] Taking into account the high transmission performance and anti-interference requirements in this scheme, a double-layer shielding structure is adopted. Common shielding methods include metal tape wrapping, metal wire braiding, flat metal braiding and other methods. The metal tape wrapping shielding has better shielding effect than the metal wire braiding shielding, but its disadvantage is that it is difficult to bend and has poor flexibility. It is only suitable for use in cases with large distances and large bending radii. The metal wire braiding has good flexibility, but the outer diameter of the braided metal wire is thicker, which will increase the overall weight and outer diameter of the cable. The flat metal braiding can be both soft and compact and lightweight.

[0031] Therefore, in the utility model, the inner shielding layer of the lightweight shielding layer 3 adopts flat metal braiding (round wire braiding can also be used with the same effect), which is soft and thin, and its planar structure can also slightly improve the attenuation performance of the cable.

[0032] Furthermore, in order to reduce the overall weight of the product, the outer shielding layer of the lightweight shielding layer 3 adopts a new lightweight metal-coated aramid material. The new lightweight metal-coated aramid material has the same shielding effectiveness as the traditional metal braided layer. The metal coating is mainly silver and nickel, and has excellent shielding effectiveness.

[0033] Taking a typical four-core product as an example, the outer shielding accounts for 28% of the total weight of the product. The weight of the lightweight shielding layer 3 of the utility model is about 1 / 5 of the traditional metal shielding. It is estimated that the overall weight reduction of the product can reach about 22%, which is very significant for aerospace application scenarios that are very sensitive to weight. For data cables with 8 or even more cores, the weight reduction effect is even more significant.

[0034] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0035] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0036] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A high tensile strength lightweight data cable, comprising a conductor (1), an aramid filling core (2) and a lightweight shielding layer (3), characterized in that: A plurality of the conductors (1) are provided, and the plurality of the conductors (1) are evenly distributed between the aramid filling core (2) and the light shielding layer (3); The aramid filling core (2) comprises a central core wire and an outer wrapping layer, and the light shielding layer (3) comprises an inner shielding layer and an outer shielding layer.

2. A high tensile strength lightweight data cable according to claim 1, characterized in that: The central core wire is made of aramid material, and the outer wrapping layer is formed by plastic extrusion.

3. A high tensile strength lightweight data cable according to claim 1, characterized in that: The inner shielding layer is formed by flat metal braiding, and the outer shielding layer is made of a new lightweight metal-plated aramid material.

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