Communication cable

Abstract

The utility model relates to the technical field of cables, aims at solving the technical problems that some existing communication cables are too large in outer diameter and high in construction difficulty, and provides a communication cable which comprises a plurality of neutral lines, a plurality of wires and a reinforcing piece, and the plurality of neutral lines and the plurality of wires are twisted around the reinforcing piece in a star quad mode. The number of the neutral lines is an even number and is larger than or equal to four, the number of the wires is an even number and is larger than or equal to four, one neutral line is arranged between every two adjacent wires, and every two opposite wires form a communication group. The neutral line has a first outer diameter, the lead has a second outer diameter, and the first outer diameter is smaller than the second outer diameter. The beneficial effects of the utility model are that the external diameter and the installation difficulty of the communication cable are reduced.

Description

Technical Field

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

[0002] CANBUS (Control Area Network BUS) bus system is widely used in automation industries including rail transit. Existing multi-channel communication cables are usually simply twisted together by twisting multiple simplex channel cables, which makes the final communication cable larger in diameter and harder. In addition, during the cable terminal processing, multiple simplex channel cables need to handle shield grounding, sheath stripping and other construction steps separately, which ultimately makes the construction of communication cables more difficult. Utility Model Content

[0003] The present application provides a communication cable to solve the technical problems of some existing communication cables having an excessively large outer diameter and high construction difficulty.

[0004] The embodiment of the present application is implemented as follows:

[0005] The present application provides a communication cable, comprising a plurality of neutral wires, a plurality of conductors and a reinforcement member, wherein the plurality of neutral wires and the plurality of conductors are twisted in a star-twisted manner around the reinforcement member. The number of the neutral wires is an even number and is greater than or equal to four, the number of the conductors is an even number and is greater than or equal to four, one neutral wire is provided between each two adjacent conductors, and each two opposite conductors constitute a communication group. The neutral wire has a first outer diameter, the conductor has a second outer diameter, and the first outer diameter is smaller than the second outer diameter.

[0006] Multiple neutral wires and multiple conductors are twisted around the reinforcement member through a star-twisted twist, which can ensure that the multiple conductors are tightly twisted with the multiple neutral wires, reduce the cabling diameter of the communication cable, and improve the cabling structure stability of the communication cable. Among the even-numbered conductors of more than four, every two conductors constitute a communication group, so that at least two pairs of communication can be achieved. More than four even-numbered neutral wires can not only cooperate with multiple conductors to form a star-twisted twisted structure, but also provide a connection point so that the unbalanced current of each phase flows in the neutral wire, achieves the effect of current balance, and ensures communication reliability. In addition, by making the first outer diameter smaller than the second outer diameter, it is convenient to set a neutral wire between two adjacent conductors, improve the integration of the communication cable, and further reduce the cross-sectional area of ​​the communication cable, thereby reducing the outer diameter of the communication cable. In the communication cable of the present application, the star-twisted structure formed by the twisting of the neutral wire, the conductor and the reinforcement has a high concentricity, which can ensure the near-end crosstalk attenuation performance of the communication cable and improve the transmission reliability of the communication cable. At the same time, since the near-end crosstalk attenuation performance is guaranteed by the star-twisted structure, the filling amount of fillers and insulators of the communication cable can also be reduced, thereby further reducing the outer diameter of the communication cable, reducing the hardness of the communication cable, and reducing the difficulty of installing the communication cable.

[0007] In one possible implementation:

[0008] The neutral line includes a first conductor and a first insulating sleeve, wherein the first insulating sleeve is wrapped around the outside of the first conductor, and the first conductor includes a copper-tin alloy conductor, which is formed by twisting a plurality of copper-tin alloy conductor wires.

[0009] In one possible implementation:

[0010] The first conductor is circular, and a cross-sectional area of ​​the first conductor is less than or equal to 0.13 square millimeters.

[0011] In one possible implementation:

[0012] The wire comprises a second conductor and a second insulating sleeve, wherein the second insulating sleeve is wrapped around the outside of the second conductor, and the cross-sectional area of ​​the second conductor is less than or equal to 0.5 square millimeters.

[0013] In one possible implementation:

[0014] The outer circumference of each conductor is tangent to the outer circumferences of the two neutral lines located on both sides thereof, and the outer circumference of each conductor is tangent to the outer circumference of the reinforcement.

[0015] In one possible implementation:

[0016] The communication cable further includes a first shielding layer, which is wrapped around the outside of the reinforcement, the conductor and the neutral line.

[0017] In one possible implementation:

[0018] The first shielding layer is made of braided units, and the material of the braided units includes silver-plated aramid.

[0019] In one possible implementation:

[0020] The communication cable also includes a second shielding layer, which is arranged on the inner side of the first shielding layer and wrapped around the outer sides of the plurality of neutral wires, the plurality of conductors and the reinforcement member.

[0021] In one possible implementation:

[0022] The outer circumference of each of the conductive wires is tangent to the inner surface of the second shielding layer, and the outer circumference of each of the neutral wires is tangent to the inner surface of the second shielding layer.

[0023] In one possible implementation:

[0024] The communication cable also includes an outer protective member, which forms a receiving space, and the plurality of neutral wires, the plurality of conductors and the reinforcement member are placed in the receiving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the structure of a communication cable according to an embodiment of the present application.

[0027] Description of main component symbols:

[0028] Communication Cable 100 Neutral 10 First conductor 11 Copper-tin alloy wire 11a First insulation sleeve 12 wire 20 Second conductor 21 Tinned copper stranded wire 21a Second insulation sleeve 22 Reinforcement 30 First shielding layer 40 Weaving unit 40a Second shielding layer 50 Outer protection 60 DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a centered element. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be a centered element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0032] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.

[0033] See also Figure 1 The present embodiment provides a communication cable 100, comprising a plurality of neutral wires 10, a plurality of conductors 20 and a reinforcement member 30, wherein the plurality of neutral wires 10 and the plurality of conductors 20 are twisted in a star-twisted manner around the reinforcement member 30. The number of neutral wires 10 is an even number and is greater than or equal to four, the number of conductors 20 is an even number and is greater than or equal to four, a neutral wire 10 is provided between each two adjacent conductors 20, and each two opposite conductors 20 constitute a communication group. The neutral wire 10 has a first outer diameter, and the conductor 20 has a second outer diameter, and the first outer diameter is smaller than the second outer diameter.

[0034] Multiple neutral wires 10 and multiple conductors 20 are twisted in a star-twisted manner around a reinforcement member 30, which can ensure that multiple conductors 20 are tightly twisted with multiple neutral wires 10, reduce the cabling diameter of the communication cable 100, and improve the cabling structure stability of the communication cable 100. Among the conductors 20 of an even number of more than four, every two conductors 20 constitute a communication group, so that at least two pairs of communication can be achieved. The neutral wires 10 of an even number of more than four can not only cooperate with multiple conductors 20 to form a star-twisted twisted structure, but also provide a connection point so that the unbalanced current of each phase flows in the neutral wire 10, achieve the effect of current balance, and ensure communication reliability. In addition, by making the first outer diameter smaller than the second outer diameter, it is convenient to set a neutral wire 10 between two adjacent conductors 20, improve the integration of the communication cable 100, and further reduce the cross-sectional area of ​​the communication cable 100, thereby reducing the outer diameter of the communication cable 100. In the communication cable 100 of the present application, the star-twisted structure formed by twisting the neutral line 10, the conductor 20 and the reinforcement 30 has a high concentricity, which can ensure the near-end crosstalk attenuation performance of the communication cable 100 and improve the transmission reliability of the communication cable 100. At the same time, since the near-end crosstalk attenuation performance is ensured by the star-twisted structure, the filling amount of the filler and the spacer of the communication cable 100 can also be reduced, thereby further reducing the outer diameter of the communication cable 100, reducing the hardness of the communication cable 100, reducing the difficulty of installing the communication cable 100, and simplifying the installation process of the communication cable 100.

[0035] In addition, the existing CANBUS cable is usually composed of two conductors 20 and a neutral line 10, and the outer diameters of the two are similar. In this embodiment, according to the current carrying capacity performance of the neutral line 10, when the current carrying capacity of a single neutral line 10 cannot meet the needs of two conductors 20, the number of neutral lines 10 can be set to be the same as the number of conductors 20. In this way, two neutral lines 10 are respectively configured for every two conductors 20. Although the first outer diameter of the neutral line 10 is smaller than the second outer diameter of the conductor 20, the two neutral lines 10 with smaller outer diameters can still meet the needs of the two conductors 20. At the same time, the outer diameter of the neutral line 10 is reduced. Compared with the existing CANBUS cable with a larger outer diameter, the cabling pitch of the communication cable 100 of this embodiment can also be further reduced, reducing the influence of the cabling pitch on the near-end crosstalk attenuation, and ensuring the system stability of the communication cable 100. This ingenious design enables the number of neutral lines 10 to meet the current carrying capacity requirements and enables the size of the neutral line 10 to be filled between the conductors 20. In this embodiment, the twisted center line of each neutral line 10 and the twisted center line of each conductor 20 coincide with the central axis of the reinforcement member 30. In this way, the concentricity of each neutral line 10 and each conductor 20 can be improved, and the near-end crosstalk attenuation performance of the communication cable 100 can be further guaranteed. Since the communication cable 100 of this embodiment can at least support duplex communication and also has good near-end crosstalk attenuation performance, its system stability is relatively high and can be applied to the CANBUS communication system transmission of rail transit vehicles.

[0036] In this embodiment, the twisting pitch of the star-twisted structure is less than or equal to fifteen times the outer diameter of the communication cable 100, thereby further improving the twisting tightness of the star-twisted structure.

[0037] In this embodiment, see Figure 1 The number of neutral lines 10 is four, the number of conductors 20 is four, two of the four conductors 20 form a line pair communication group, and the other two conductors 20 form another line pair communication group.

[0038] In other embodiments, the number of neutral lines 10 may be six, eight or an even number above, and the number of conductors 20 may be six, eight or an even number above.

[0039] In this embodiment, see Figure 1 The neutral line 10 includes a first conductor 11 and a first insulating sleeve 12, and the first insulating sleeve 12 is wrapped around the outside of the first conductor 11. The wire 20 includes a second conductor 21 and a second insulating sleeve 22, and the second insulating sleeve 22 is wrapped around the outside of the second conductor 21.

[0040] In this embodiment, see Figure 1The first conductor 11 is circular, and the cross-sectional area of ​​the first conductor 11 is less than or equal to 0.13 square millimeters. The wire 20 includes a second conductor 21 and a second insulating sleeve 22, and the second insulating sleeve 22 is wrapped around the outside of the second conductor 21, and the cross-sectional area of ​​the second conductor 21 is less than or equal to 0.5 square millimeters.

[0041] The existing CANBUS cable includes two conductors 20 with a cross-sectional area of ​​0.5 square millimeters and a neutral line 10 with a cross-sectional area of ​​0.5 square millimeters. The existing duplex communication cable is composed of two groups of CANBUS cables, and its outer diameter is about 1.9 times the outer diameter of a CANBUS cable. In this embodiment, by reducing the cross-sectional area of ​​the first conductor 11 of the neutral line 10, the outer diameter of the communication cable 100 is about 1.16 times the outer diameter of a CANBUS cable, thereby further reducing the outer diameter of the communication cable 100.

[0042] In this embodiment, the first conductor 11 includes a copper-tin alloy wire 11a, which is formed by twisting a plurality of copper-tin alloy wires 11a. The copper-tin alloy wire 11a has good electrical conductivity and can improve the current carrying capacity of the neutral line 10, thereby facilitating the reduction of the cross-sectional area of ​​the first conductor 11, thereby reducing the outer diameter of the neutral line 10, reducing the weight of the communication cable 100, reducing the amount of copper used, and meeting the requirements of weight reduction and low carbon.

[0043] In this embodiment, the second conductor 21 can be configured as a tinned copper strand 21a. In other embodiments, the material of the first conductor 11 and the material of the second conductor 21 can also be changed according to actual needs.

[0044] In this embodiment, see Figure 1 The outer circumference of each conductor 20 is tangent to the outer circumferences of the two neutral lines 10 located on both sides thereof, and the outer circumference of each conductor 20 is tangent to the outer circumference of the reinforcement member 30. In this way, the structural tightness of the communication cable 100 can be further improved and its outer diameter can be reduced.

[0045] In this embodiment, the communication cable 100 further includes a first shielding layer 40, which is disposed outside the reinforcement member 30, the conductor 20 and the neutral line 10. The first shielding layer 40 has the ability to resist external electromagnetic interference.

[0046] In this embodiment, the first shielding layer 40 is woven by weaving units 40a, and the material of the weaving units 40a includes silver-plated aramid. The silver-plated aramid can ensure the shielding performance of the first shielding layer 40 while having a relatively thin thickness, thereby further reducing the outer diameter and weight of the communication cable 100.

[0047] The silver-plated aramid fiber of the present embodiment can be produced by an aramid chemical silver plating method. The specific production process can refer to the existing silver-plated aramid fiber production process, which will not be described in detail here.

[0048] In this embodiment, see Figure 1 The communication cable 100 further includes a second shielding layer 50, which is disposed inside the first shielding layer 40 and wrapped around the outside of the plurality of neutral wires 10, the plurality of conductors 20 and the reinforcement member 30. Optionally, the second shielding layer 50 may be an aluminum foil shielding layer.

[0049] In this embodiment, see Figure 1 The outer circumference of each conductor 20 is tangent to the inner surface of the second shielding layer 50 , and the outer circumference of each neutral line 10 is tangent to the inner surface of the second shielding layer 50 .

[0050] In this embodiment, see Figure 1 The communication cable 100 further includes an outer protective member 60, which is formed with a receiving space, and a plurality of neutral wires 10, a plurality of conductors 20 and a reinforcing member 30 are placed in the receiving space. The outer protective member 60 is a protective sleeve, which can be made of a low-smoke halogen-free flame-retardant material.

[0051] In this embodiment, the reinforcement member 30 can be a nylon filling wire. The outer diameter of the reinforcement member 30 can be set to between 0.8 mm and 1 mm, for example, the outer diameter of the reinforcement member 30 can be set to 0.8 mm, 0.9 mm or 1 mm. Of course, in other embodiments, the reinforcement member 30 can also be made of other materials, such as flame retardant silicone rubber.

[0052] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A communication cable, characterized in that: The invention comprises a plurality of neutral wires, a plurality of conducting wires and a reinforcing member, wherein the plurality of neutral wires and the plurality of conducting wires are twisted in a star-twisted manner around the reinforcing member; The number of the neutral lines is an even number and is greater than or equal to four, the number of the conductors is an even number and is greater than or equal to four, one neutral line is provided between each two adjacent conductors, and each two opposite conductors constitute a communication group; The neutral wire has a first outer diameter, and the conductor wire has a second outer diameter, and the first outer diameter is smaller than the second outer diameter.

2. The communication cable according to claim 1, characterized in that: The neutral line includes a first conductor and a first insulating sleeve, wherein the first insulating sleeve is wrapped around the outside of the first conductor, and the first conductor includes a copper-tin alloy conductor, which is formed by twisting a plurality of copper-tin alloy conductor wires.

3. The communication cable according to claim 2, characterized in that: The first conductor is circular, and a cross-sectional area of ​​the first conductor is less than or equal to 0.13 square millimeters.

4. The communication cable according to claim 3, characterized in that: The wire comprises a second conductor and a second insulating sleeve, wherein the second insulating sleeve is wrapped around the outside of the second conductor, and the cross-sectional area of ​​the second conductor is less than or equal to 0.5 square millimeters.

5. The communication cable according to claim 1, characterized in that: The outer circumference of each conductor is tangent to the outer circumferences of the two neutral lines located on both sides thereof, and the outer circumference of each conductor is tangent to the outer circumference of the reinforcement.

6. The communication cable according to claim 1, characterized in that: The communication cable further includes a first shielding layer, which is wrapped around the outside of the reinforcement, the conductor and the neutral line.

7. The communication cable according to claim 6, characterized in that: The first shielding layer is made of braided units, and the material of the braided units includes silver-plated aramid.

8. The communication cable according to claim 6, characterized in that: The communication cable also includes a second shielding layer, which is arranged on the inner side of the first shielding layer and wrapped around the outer sides of the plurality of neutral wires, the plurality of conductors and the reinforcement member.

9. The communication cable according to claim 8, characterized in that: The outer circumference of each of the conductive wires is tangent to the inner surface of the second shielding layer, and the outer circumference of each of the neutral wires is tangent to the inner surface of the second shielding layer.

10. The communication cable according to claim 1, characterized in that: The communication cable also includes an outer protective member, which forms a receiving space, and the plurality of neutral wires, the plurality of conductors and the reinforcement member are placed in the receiving space.

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