CN218384603U

CN218384603U - Shielded communication cable

Info

Publication number: CN218384603U
Application number: CN202222157398.2U
Authority: CN
Inventors: 肖永利; 高笃良; 尹克伸; 闫付乐; 罗伟
Original assignee: Beijing Jingdian Power Grid Maintenance Group Co ltd
Current assignee: Beijing Jingdian Power Grid Maintenance Group Co ltd
Priority date: 2022-08-16
Filing date: 2022-08-16
Publication date: 2023-01-24
Anticipated expiration: 2032-08-16

Abstract

The utility model provides a shielding communication cable, include: the cable core comprises at least one shielding four-wire set and a first shielding layer; the first shielding layer is coated on the outer side of the shielding four-wire set; the first shielding layer corresponds to the shielding four-line set one by one; the outer side of the cable core is sequentially coated with a second belting layer, a second shielding layer, an inner sheath layer, an armor layer and an outer sheath from inside to outside; the first shielding layer, the second shielding layer and the armor layer are made of metal materials, and the first shielding layer, the second shielding layer and the armor layer are used for shielding interference of external signals on the cable core; the utility model discloses it is integrative to make up a plurality of shielding four-wire sets, through first shielding layer, second shielding layer and armor combined action, forms triple wall magnetic field effect, has increased shielding communication cable's interference killing feature, the utility model discloses the scheme is reasonable, and simple structure realizes easily that can obviously increase shielding communication cable's interference killing feature and mechanical strength.

Description

Shielded communication cable

Technical Field

The utility model relates to a signal cable technical field particularly, relates to a shielding communication cable.

Background

At present, the phenomenon of short circuit or open circuit of a cable core caused by external force extrusion or smashing damage often occurs in the wiring process of a communication cable, the communication cable can be combined with other cables of different types (such as a power cable, a control cable, an installation cable and the like) to be laid in the laying process, and different electromagnetic waves can be generated to generate interference on the communication cable when the cables of different types are electrified to work respectively, so that the data transmission of the communication cable is unstable; therefore, the existing communication cable has low mechanical strength and poor resistance to external signal interference.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shielding communication cable to solve the low and poor problem of interference killing feature of communication cable's among the prior art mechanical strength.

In order to solve the above problem, the utility model provides a shielding communication cable, include: the cable core comprises at least one shielding four-wire set and a first shielding layer; the first shielding layer is coated on the outer side of the shielding four-wire set; the first shielding layer corresponds to the shielding four-line set one by one; the outer side of the cable core is sequentially coated with a second wrapping tape layer, a second shielding layer, an inner sheath layer, an armor layer and an outer sheath from inside to outside; the first shielding layer, the second shielding layer and the armor layer are made of metal materials, and the first shielding layer, the second shielding layer and the armor layer shield the interference of external signals to the cable core together.

Further, the shielded quad group includes: four groups of core wires, wherein each group of core wires comprises an insulating layer and two insulating single wires which are twisted with each other; the insulating layer is coated on the outer sides of the two insulating single wires; the four groups of core wires are mutually twisted; the first wrapping layer is wrapped outside the four groups of core wires; the first shielding layer is coated outside the first wrapping layer and is used for shielding the interference of external signals on the four groups of core wires; the inner liner layer, the inner liner layer cladding is outside first shielding layer.

Further, the first shielding layer comprises an aluminum foil layer and a first drainage wire; the first drainage wire is wound on the outer side of the first wrapping layer; the aluminum foil layer is coated on the outer sides of the first drainage wire and the first wrapping layer.

Further, the inner liner layer is made of flame-retardant polyvinyl chloride material; the insulating layer is made of polyolefin material.

Further, the cable core comprises two shielding four-wire sets which are twisted with each other.

Further, the second shielding layer includes: a copper strip layer and a second drainage wire; the second drainage wire is wound on the outer side of the second belting layer; the copper belt layer is coated on the outer sides of the second drainage wire and the second belt layer; the copper tape layer shielding layer is formed by spirally winding a copper tape with the thickness of 0.046-0.057mm along the axial direction of the cable core at the overlapping rate of more than 20%.

Furthermore, the second shielding layer also comprises a non-woven fabric layer, and the non-woven fabric layer is coated on the outer side of the copper belt layer; the non-woven fabric layer is formed by spirally winding the non-woven fabric along the axial direction of the cable core; the spiral winding direction of the non-woven fabric is opposite to the spiral winding direction of the copper strip.

Further, a cavity is formed between the armor layer and the inner sheath layer and is used for protecting the inner sheath layer; the armor layer is formed by spirally winding two layers of galvanized steel strips along the axial direction of the cable core with the overlapping rate of more than 50 percent.

Further, the inner sheath layer is made of polyethylene resin through thermal molding.

Further, the outer sheath is made of flame-retardant polyvinyl chloride through thermal molding.

Use the technical scheme of the utility model, the utility model provides a shielding communication cable, include: the cable core comprises at least one shielding four-wire set and a first shielding layer; the first shielding layer is coated on the outer side of the shielding four-wire set; the first shielding layer corresponds to the shielding four-line set one by one; the outer side of the cable core is sequentially coated with a second belting layer, a second shielding layer, an inner sheath layer, an armor layer and an outer sheath from inside to outside; the first shielding layer, the second shielding layer and the armor layer are made of metal materials, and the first shielding layer, the second shielding layer and the armor layer shield interference of external signals to the cable core. The utility model combines a plurality of shielding four-wire groups into a whole, and forms triple magnetic field isolation effect through the combined action of the first shielding layer, the second shielding layer and the armor layer, thereby increasing the anti-interference capability of the shielding communication cable and enhancing the electromagnetic compatibility capability of the shielding communication cable; the armor layer enhances coupling attenuation and reduces phase delay difference and simultaneously enhances the mechanical strength of the cable core; the armor layer can enhance the mechanical strength of the shielded communication cable and simultaneously prevent the shielded communication cable from being damaged by mouse bite in the pre-laying process; the outer sheath can not generate delayed combustion when encountering fire, thereby providing time guarantee for fire self-rescue; the armor layer effectively enhances the mechanical strength of the shielded communication cable, so that the phenomena of short circuit and open circuit faults of the shielded communication cable are obviously reduced; therefore, the utility model discloses the scheme is reasonable, simple structure, and easy the realization can obviously increase shielding communication cable's interference killing feature and mechanical strength.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows an internal schematic structure diagram of a shielded communication cable according to an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a cable core; 11. a first shielding layer; 12. shielding the four-wire set; 121. a core wire; 1211. an insulated single wire; 122. an insulating layer; 123. a first wrapping layer; 124. an inner liner layer;

20. a second band layer;

30. a second shielding layer;

40. an inner jacket layer;

50. an armor layer;

60. an outer sheath;

70. a cavity.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a shielded communication cable, including: the cable core 10 comprises at least one shielding quadruplex 12 and a first shielding layer 11; the first shielding layer 11 covers the outer side of the shielding quadruple wire group 12; the first shielding layer 11 corresponds to the shielding quadruple 12 one by one; the outer side of the cable core 10 is sequentially coated with a second wrapping tape layer 20, a second shielding layer 30, an inner sheath layer 40, an armor layer 50 and an outer sheath 60 from inside to outside; the first shielding layer 11, the second shielding layer 30 and the armor layer 50 are all made of metal materials, and the first shielding layer 11, the second shielding layer 30 and the armor layer 50 shield the interference of external signals to the cable core 10 together.

The utility model combines a plurality of shielding four-wire sets 12 into a whole, and forms triple isolation magnetic field effect through the combined action of the first shielding layer 11, the second shielding layer 30 and the armor layer 50, thereby increasing the anti-interference capability of the shielding communication cable and enhancing the electromagnetic compatibility capability of the shielding communication cable; the armor layer 50 enhances coupling attenuation and reduces phase delay difference, and simultaneously enhances the mechanical strength of the cable core 10; the armor layer 50 can enhance the mechanical strength of the shielded communication cable and simultaneously prevent the shielded communication cable from being damaged by mouse biting in the pre-laying process; the outer sheath 60 does not generate delayed combustion when encountering a fire, thereby providing time guarantee for fire self-rescue; the armor layer 50 effectively enhances the mechanical strength of the shielded communication cable, so that the short circuit and open circuit faults of the shielded communication cable are obviously reduced; therefore, the utility model discloses the scheme is reasonable, simple structure, and easy the realization can obviously increase shielding communication cable's interference killing feature and mechanical strength.

As shown in fig. 1, the shielded quad group 12 includes: four sets of core wires 121, each set of core wires 121 including an insulating layer 122 and two insulating single wires 1211 twisted with each other; the insulating layer 122 covers the outer sides of the two insulating single lines 1211; the four groups of core wires 121 are twisted with each other; a first belt layer 123, wherein the first belt layer 123 covers the four groups of core wires 121; the first shielding layer 11 is coated outside the first wrapping layer 123 and is used for shielding interference of external signals on the four groups of core wires 121; and the lining layer 124 is coated outside the first shielding layer 11. With this arrangement, the first wrapping layer 123 firmly wraps and fixes the four groups of core wires 121 together; the first shielding layer 11 plays a role of shielding interference for each shielding four-wire set 12 independently, and the shielding effect is better.

It should be noted that: the two insulated single wires 1211 can adopt wire cores with different colors and different twisting pitch ratios according to the actual use requirement; the four groups of core wires 121 can be twisted with each other by different twisting pitch ratios according to the actual use requirement.

The first shielding layer 11 comprises an aluminum foil layer and a first drainage wire; the first drainage wire is wound on the outside of the first belt layer 123; the aluminum foil layer is wrapped around the first drainage wire and the first wrapping layer 123. The aluminium foil layer is when guaranteeing shielding effect, and the lightweight more effectively reduces 11 whole qualities of first shielding layer, is favorable to shielding communication cable's lightweight.

Inner liner 124 is made of a flame retardant polyvinyl chloride material; the insulating layer 122 is a polyolefin material. The polyolefin material can effectively ensure the insulation effect of the insulation layer 122, and the cost is low; the inner liner 124 made of flame retardant polyvinyl chloride material plays a role in reducing capacitance, enhancing coupling attenuation, reducing phase delay difference and retarding flame.

It should be noted that: in an actual use scenario, the lining layer 124 may be a multilayer structure, for example, the lining layer 124 is formed by coating a layer of flame retardant polyvinyl chloride material and a layer of polyethylene material from outside to inside, which can achieve a better use effect.

The cable core 10 comprises two sets of shielded quadrifilars 12 twisted about one another. The two shielded quadrifilar 12 satisfy the actual use requirement and ensure the light weight and low cost of the shielded communication cable. The two twisted shielded quadrifilar 12 may have different twist pitch ratios depending on the actual application.

It should be noted that the shielded communication cable provided by the present invention satisfies the following specific parameters under the condition that the cable core 10 includes two shielding quadruplet 12 twisted with each other:

1. the conductor resistance value meets the requirements of IEC 344: the maximum value of the direct current resistance of a single conductor is 9.5 omega/100 m at the temperature of 20 ℃;

2. the unbalance of the internal resistance of the line pair is not more than 2 percent, and the unbalance between the line pair and the line pair is not more than 4 percent;

3. dielectric strength: between the conductor and between the conductor and the shield, the direct current is not broken down at 1kV/1 min;

4. the minimum value of the insulation resistance is more than 150M omega-km;

5. capacitive imbalance: 160pF/100m at a frequency of 1 kHz;

6. maximum transmission frequency: 100MHz;

7. attenuation of any line pair: the maximum is 3.1dB/100m at 1MHz, and the maximum is 33.0dB/100m at 100MHz;

8. near-end crosstalk: 62dB minimum at 1MHz, 32dB minimum at 100MHz;

9. characteristic impedance: 100 Ω ± 15 Ω.

The second shield layer 30 includes: a copper strip layer and a second drainage wire; the second drainage wire is wound on the outer side of the second wrapping band layer 20; the copper tape layer is coated on the outer sides of the second drainage wire and the second wrapping tape layer 20; the copper strip layer shielding layer is formed by spirally winding a copper strip with the thickness of 0.046-0.057mm along the axial direction of the cable core 10 with the overlapping rate of more than 20%. The copper strip layer is used as a main carrier for mainly shielding the communication cable from magnetic field interference, and the shielding effect is excellent.

In one embodiment of the present invention, the number of second drain wires is 2.

The second shielding layer 30 further includes a non-woven fabric layer, and the non-woven fabric layer covers the outer side of the copper tape layer; the non-woven fabric layer is formed by spirally winding non-woven fabric along the axial direction of the cable core 10; the spiral winding direction of the non-woven fabric is opposite to the spiral winding direction of the copper strip. The non-woven fabric enables the second shielding layer 30 to be smoother, more compact and more compact, and can effectively eliminate the corona phenomenon; the spiral winding direction of the non-woven fabric is opposite to the spiral winding direction of the copper strip, so that the non-woven fabric and the copper strip are firmly wound and are not loosened.

As shown in fig. 1, a cavity 70 is formed between the armor layer 50 and the inner jacket layer 40, and the cavity 70 is used for protecting the inner jacket layer 40; the armor layer 50 is formed by spirally winding two layers of galvanized steel tapes in the axial direction of the cable core 10 with an overlapping rate of more than 50%. When an external force impacts the shielded communication cable, the cavity 70 buffers the impact; when the shielded communication cable is laid in an underground pipeline or in the field, the armor layer 50 can prevent mice from biting the shielded communication cable, and the effect of protecting the cable core 10 is achieved; the armor layer 50 formed by winding the two layers of galvanized steel strips enhances the mechanical strength of the shielded communication cable, and simultaneously, the armor layer and the first shielding layer 11 and the second shielding layer 30 jointly act to form a triple magnetic field isolation effect.

In one embodiment of the present invention, the thickness of each layer of galvanized steel strip is 0.2mm.

The inner sheath layer 40 is made of polyethylene resin through thermal molding. In one embodiment of the present invention, the inner sheath layer 40 is made of a high density polyethylene resin through thermal molding. The inner sheath layer 40 ensures that the shielded communication cable can still normally work under the condition of-70 ℃; the polyethylene resin has extremely poor water absorption, so that the shielding communication cable still has good insulating property in underground pipelines and outdoor rain or water immersion environments.

The outer sheath 60 is made of flame retardant polyvinyl chloride through thermoplastic molding. By the arrangement, the shielding communication cable can be prevented from being ignited in case of fire, and valuable time is provided for rescue and self rescue.

It is worth mentioning that: in an actual use scene, the outer sheath 60 is made of a class-A flame-retardant polyvinyl chloride material through thermoplastic molding, so that better flame-retardant and protective effects can be achieved.

To sum up, the utility model discloses following technological effect has:

1. the utility model combines a plurality of shielding four-wire sets 12 into a whole, and forms triple magnetic field isolation effect through the combined action of the first shielding layer 11, the second shielding layer 30 and the armor layer 50, thereby increasing the anti-interference capability of the shielding communication cable and enhancing the electromagnetic compatibility capability of the shielding communication cable; the armor 50 enhances coupling attenuation and reduces phase delay variation while also enhancing the mechanical strength of the cable core 10.

2. The armor layer 50 can enhance the mechanical strength of the shielded communication cable and prevent the shielded communication cable from being damaged by mouse biting in the pre-laying process.

3. The outer sheath 60 does not delay combustion in case of fire, and provides time guarantee for self-rescue in fire.

4. Since the armor layer 50 effectively enhances the mechanical strength of the shielded communication cable, the short circuit and open circuit failure phenomena of the shielded communication cable are significantly reduced.

5. The utility model discloses the scheme is reasonable, simple structure, realizes easily, can obviously increase shielding communication cable's interference killing feature and mechanical strength.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the directional terms such as "front, back, upper, lower, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and in the case of not making a contrary explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms do not have special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shielded communications cable, comprising:

a cable core (10), the cable core (10) comprising at least one shielded quad set (12) and a first shield layer (11); the first shielding layer (11) covers the outer side of the shielding four-wire group (12); the first shielding layers (11) correspond to the shielding four-wire groups (12) one by one;

the outer side of the cable core (10) is sequentially coated with a second wrapping tape layer (20), a second shielding layer (30), an inner sheath layer (40), an armor layer (50) and an outer sheath (60) from inside to outside;

the first shielding layer (11), the second shielding layer (30) and the armor layer (50) are all made of metal materials, and the first shielding layer (11), the second shielding layer (30) and the armor layer (50) jointly shield interference of external signals to the cable core (10).

2. Shielded communication cable according to claim 1, characterized in that the shielded quad set (12) comprises:

four sets of core wires (121), each set of the core wires (121) including an insulating layer (122) and two insulating single wires (1211) twisted with each other; the insulating layer (122) covers the outer sides of the two insulating single wires (1211); the four groups of core wires (121) are mutually twisted;

a first belt layer (123), wherein the first belt layer (123) covers the four groups of core wires (121); the first shielding layer (11) is coated outside the first wrapping layer (123) and is used for shielding interference of external signals on four groups of core wires (121);

the inner liner layer (124), inner liner layer (124) cladding is in outside first shielding layer (11).

3. A shielded communication cable according to claim 2, wherein the first shield layer (11) comprises an aluminium foil layer and a first current-drainage thread; the first drainage thread is wound on the outer side of the first belt wrapping layer (123); the aluminum foil layer is coated on the outer sides of the first drainage wire and the first wrapping layer (123).

4. Shielded communication cable according to claim 2, wherein the inner liner (124) is made of a flame retardant polyvinyl chloride material; the insulating layer (122) is a polyolefin material.

5. A shielded communication cable according to claim 1, wherein the cable core (10) comprises two of the shielded quads (12) twisted about each other.

6. Shielded communication cable according to claim 1, wherein the second shielding layer (30) comprises: a copper strip layer and a second drainage wire; the second drainage wire is wound on the outer side of the second belting layer (20); the copper belt layer is coated on the outer sides of the second drainage wire and the second belt layer (20); the copper tape layer shielding layer is formed by spirally winding a copper tape with the thickness of 0.046-0.057mm along the axial direction of the cable core (10) with the overlapping rate of more than 20%.

7. Shielded communication cable according to claim 6, wherein the second shielding layer (30) further comprises a non-woven layer covering the copper tape layer on the outside; the non-woven fabric layer is formed by spirally winding non-woven fabric along the axial direction of the cable core (10); the spiral winding direction of the non-woven fabric is opposite to the spiral winding direction of the copper strip.

8. Shielded communication cable according to claim 1, wherein a cavity (70) is formed between the armouring layer (50) and the inner sheath layer (40), said cavity (70) being adapted to protect the inner sheath layer (40); the armor layer (50) is formed by spirally winding two layers of galvanized steel strips along the axial direction of the cable core (10) with the overlapping rate of more than 50%.

9. Shielded communication cable according to claim 1, characterized in that the inner sheath layer (40) is made of a polyethylene resin through thermoplastic molding.

10. Shielded communication cable according to claim 1, wherein the outer sheath (60) is made of flame retardant polyvinyl chloride, thermoplastic.