CN217156889U

CN217156889U - ADSS optical cable

Info

Publication number: CN217156889U
Application number: CN202221715454.3U
Authority: CN
Inventors: 沈冰冰; 缪小明; 薛赵剑; 周娟
Original assignee: Jiangsu Zhongtian Technology Co Ltd
Current assignee: Jiangsu Zhongtian Technology Co Ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-08-09
Anticipated expiration: 2032-07-06

Abstract

The utility model provides an ADSS optical cable relates to electric power communication optical cable technical field. The ADSS optical cable comprises an outer sheath, an aramid yarn layer, an inner sheath, a bundling pipe, a micro-pipe and an optical cable subunit; the outer sheath is wrapped on the outer side of the aramid yarn layer, the aramid yarn layer is wrapped on the outer side of the inner sheath, and the inner sheath is wrapped on the outer side of the bundling pipe; a plurality of micro-tubes are arranged in the bundling tube, and the micro-tubes are sleeved outside the optical cable subunit. The optical cable subunits are installed in the microtubes in an air blowing mode by arranging the plurality of microtubes on the bundling tube, and when the ADSS optical cable has the condition of line attenuation increase or fiber breakage, the original optical cable subunits with the broken fibers or attenuation increase are blown out of the microtubes and replaced by new optical cable subunits, so that the purpose of quick maintenance can be achieved.

Description

ADSS optical cable

Technical Field

The utility model relates to a power communication optical cable technical field especially relates to an ADSS optical cable.

Background

With the continuous development of electric power construction in China, an electric power communication system plays an active role in the fields of communication data, electric power scheduling, data transmission, video conferences, protection control and the like of an electric power transmission network. The power communication optical cable used by the power communication system is an ADSS optical cable, the ADSS optical cable is an all-dielectric power communication optical cable, and the light is widely erected on a tower along a power transmission line.

In the related technology, the ADSS optical cable comprises an outer sheath, an inner sheath, a filling rope, loose tubes, colored optical fibers, cable paste and a central reinforcing part, wherein the outer sheath wraps the outer side of the inner sheath, the central reinforcing part is located in the circle center of the ADSS optical cable, the filling rope and the plurality of loose tubes are distributed on the periphery of the central reinforcing part, the filling rope and the loose tubes are located between the central reinforcing part and the inner sheath, and each loose tube is internally provided with the colored optical fibers.

However, when the line attenuation of the ADSS optical cable is increased or the optical fiber is broken, the maintenance is slow.

SUMMERY OF THE UTILITY MODEL

The utility model provides an ADSS optical cable to when solving ADSS optical cable and appearing the increase of circuit attenuation or the disconnected fine condition, can have the slower problem of maintenance.

The utility model provides an ADSS optical cable, which comprises an outer sheath, an aramid yarn layer, an inner sheath, a bundling tube, a micro-tube and an optical cable subunit;

the outer sheath is wrapped on the outer side of the aramid yarn layer, the aramid yarn layer is wrapped on the outer side of the inner sheath, and the inner sheath is wrapped on the outer side of the bundling pipe;

and a plurality of micro tubes are arranged in the bundling tube, and the micro tubes are sleeved on the outer sides of the optical cable subunits.

Optionally, different marks are arranged on the plurality of microtubes, and the marks are used for distinguishing the plurality of microtubes;

the label is a color bar or a color ring.

Optionally, a plurality of sawtooth-shaped grooves are arranged on the inner wall of the microtube, the sawtooth-shaped grooves extend spirally along the axis of the microtube, and the sawtooth-shaped grooves are arranged at equal intervals in the circumferential direction of the microtube.

Optionally, a low friction layer is sprayed on the inner wall of the microtube, and the low friction layer is used for reducing the friction coefficient of the inner wall of the microtube.

Optionally, the low friction layer is a teflon layer or a silicon layer.

Optionally, the optical cable sub-unit is one of an air-blown optical fiber unit, a central tube type air-blown micro-cable and a layer-stranded air-blown micro-cable.

Optionally, the bundling tube is filled with a water blocking gel, the water blocking gel is located between the multiple micro tubes, and the water blocking gel is used for ensuring the water blocking performance between the multiple micro tubes.

Optionally, the micro-tube is filled with water-absorbent expansion resin, and the optical cable subunit is arranged in the center of the micro-tube.

Optionally, still include nylon layer and non-metallic armor layer, the nylon layer sets up the inner sheath with between the aramid yarn layer, non-metallic armor layer imbeds in the outer jacket.

Optionally, the non-metallic armor layer comprises a plurality of glass fiber reinforced plastic rods extending along an axis of the outer sheath, the plurality of glass fiber reinforced plastic rods being arranged at equal intervals in a circumferential direction of the outer sheath;

the cross section of the glass fiber reinforced plastic rod is triangular, the glass fiber reinforced plastic rod is provided with a first vertex angle, a second vertex angle and a third vertex angle, the first vertex angle faces the outer side of the outer sheath, and the second vertex angle and the third vertex angle face the inner side of the outer sheath.

The utility model provides an ADSS optical cable through set up many microtubules at the bunched pipe, installs the optical cable subunit in the microtubule with the mode that the optical cable subunit adopted the air-blowing, when the increase of circuit attenuation or the fine condition of breaking appear in the ADSS optical cable, blows off original disconnected fine or the optical cable subunit that the attenuation increases from the microtubule earlier to the optical cable subunit of renewal, thereby can realize the purpose of quick maintenance.

In addition to the technical problems, technical features constituting technical aspects, and advantageous effects of the technical features of the present invention described above, other technical problems, technical features included in technical aspects, and advantageous effects of the technical features that the present invention can solve will be described in further detail in the detailed description.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an ADSS optical cable according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the microtube shown in FIG. 1;

FIG. 3 is a schematic structural view of the cable sub-unit of FIG. 1;

fig. 4 is a schematic structural view of the glass fiber reinforced plastic rod of fig. 1.

Description of reference numerals:

10-an outer sheath;

20-aramid yarn layer;

30-an inner sheath;

40-a bundling tube;

41-water blocking gel;

50-a microtube;

501-sawtooth-shaped groove;

51-water swellable resin;

60-a cable subunit;

61-micro cable sheath;

62-micro cable filler;

63-a micro cable reinforcing rod;

64-fiber filler;

65-loose sleeve;

66-an optical fiber;

70-a nylon layer;

81-glass fibre reinforced plastic rod;

811-a first apex angle;

812-a second apex angle;

813-third apex angle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

When the line attenuation of the ADSS optical cable in the related art is increased or the fiber is broken, the whole ADSS optical cable needs to be detached and cut open for maintenance, so that the problem of slow maintenance exists.

In order to solve the problem, the utility model provides an ADSS optical cable sets up many microtubules through at the buncher, installs the optical cable subunit in the microtubule with the mode that optical cable subunit adopted the air-blowing, when ADSS optical cable the increase of circuit attenuation or the fine condition of breaking appear, blow off original broken fiber or the optical cable subunit that the attenuation increases earlier from the microtubule to more change new optical cable subunit, thereby can realize the purpose of quick maintenance, but also can reduce the maintenance cost.

The ADSS optical cable provided by the embodiment of the present invention is described in detail with reference to the following embodiments.

Fig. 1 is the embodiment of the utility model provides a structural schematic diagram of an ADSS optical cable.

As shown in fig. 1, an ADSS optical cable according to an embodiment of the present invention includes an outer sheath 10, an aramid yarn layer 20, an inner sheath 30, a bundling tube 40, a micro tube 50, and an optical cable subunit 60; the outer sheath 10 wraps the aramid yarn layer 20, the aramid yarn layer 20 wraps the inner sheath 30, and the inner sheath 30 wraps the bundling tube 40; a plurality of micro tubes 50 are arranged in the bundling tube 40, and the micro tubes 50 are sleeved outside the optical cable subunit 60.

The outer sheath 10 is made of polyethylene material or flame-retardant polyolefin material.

The outer sheath 10 is generally annular in shape. The thickness of the outer sheath 10 is determined as required and is not specifically set herein. Preferably, the outer sheath 10 has a thickness of 1.5mm to 2 mm.

The aramid yarn layer 20 is made of aramid yarn. The thickness of the aramid yarn layer 20 is determined as needed, and is not specifically set here. Preferably, the thickness of the aramid yarn layer 20 is 0.5mm to 0.8 mm.

The aramid yarn layer 20 may have a single-layer structure or a multi-layer structure. In some examples, the aramid yarn layer 20 is a multi-layer structure, and the aramid yarn layer 20 is twisted on the outer side of the inner sheath 30, and the twist direction between layers is opposite.

Inner sheath 30 may be made of polyethylene or flame retardant polyolefin.

The shape of inner sheath 30 matches the shape of the bundle tube 40. The thickness of the inner sheath 30 is determined as needed, and is not specifically set herein. Preferably, the inner sheath 30 has a thickness of 1.5mm to 2 mm.

The bundling tube 40 is sleeved outside the micro-tube 50, and the bundling tube 40 is used for keeping the micro-tube 50 stable. The shape of the bundle tube 40 is determined according to the number of the micro tubes 50, and for example, when the number of the micro tubes 50 is 7, the bundle tube 40 has a hollow regular hexagonal tubular structure as a whole.

The bundling tube 40 is made of plastic. The thickness of the bundling tube 40 is determined as needed, and is not specifically set here. Preferably, the thickness of the bundling tube 40 is 0.1mm to 0.2 mm.

The microtube 50 is made of a thermoplastic material, such as polyethylene or a flame retardant polyolefin. The microtube 50 is a hollow circular tubular structure as a whole. The thickness of the microtube 50 is determined as needed, and is not specifically set herein. Preferably, the thickness of the micro tube 50 is 0.05mm to 0.1 mm.

The number of the microtubes 50 may be one or plural. The number of the microtubes 50 is determined as required, and is not specifically set herein. When the number of the microtubes 50 is plural, the tube diameters of the microtubes 50 may be the same or different.

Note that the diameter of the microtube 50 is the inner diameter of the microtube 50.

Cable subunit 60 is air blown into microtube 50. When the attenuation of the ADSS optical cable is increased or the attenuation of the ADSS optical cable is broken, the optical cable subunit 60 with the original broken fiber or the attenuation increased is blown out from the micro-tube 50, and the new optical cable subunit 60 is replaced, so that the purpose of rapid maintenance can be achieved, and the maintenance cost can be reduced. In addition, when the lines of the ADSS optical cable need to be expanded, the original optical cable subunit 60 can be blown out from the microtube 50, and the expanded optical cable subunit 60 is replaced, so that the ADSS optical cable can be conveniently expanded and reconstructed.

Optionally, different marks are disposed on the plurality of microtubes 50, and the marks are used for distinguishing the plurality of microtubes 50. With the arrangement, the micro-tube 50 can be distinguished, and errors in connection of the two ADSS optical cables can be prevented.

Wherein, the mark can be a color bar or a color ring. The plurality of micro tubes 50 may be distinguished by the shape of the color bar, the number of color bars, the shape of the color circle, the number of color circles, and the like. In other implementations, the plurality of microtubes 50 may be marked with different colors throughout.

In a first alternative embodiment, 7 micro-tubes 50 are disposed in the bundle tube 40, wherein one micro-tube 50 is located at the center of the bundle tube 40, the other six micro-tubes 50 are arranged in a ring around the central micro-tube 50, the 7 micro-tubes 50 are provided with color bars of different colors, and the color bar on each micro-tube 50 extends along the axis of the micro-tube 50.

In a second alternative embodiment, 7 microtubes 50 are arranged in the cluster tube 40, wherein one microtube 50 is located at the center of the cluster tube 40, the other six microtubes 50 are arranged in a ring around the central microtube 50, color rings of different colors are arranged on the 7 microtubes 50, and the color ring on each microtube 50 is arranged along the circumferential direction of the microtube 50.

In a third alternative embodiment, 7 microtubes 50 are arranged in the cluster tube 40, wherein one microtube 50 is located in the center of the cluster tube 40, the other six microtubes 50 are arranged in a ring around the central microtube 50, the 7 microtubes 50 are coated with different colors, and the outer wall of each microtube 50 is integrally colored.

Fig. 2 is a schematic structural diagram of the microtube in fig. 1.

Alternatively, as shown in fig. 2, a plurality of sawtooth-shaped grooves 501 are provided on the inner wall of the microtube 50, the plurality of sawtooth-shaped grooves 501 spirally extend along the axis of the microtube 50, and the plurality of sawtooth-shaped grooves 501 are provided at equal intervals in the circumferential direction of the microtube 50. So set up, air stability when can improving optical cable subunit 60 air-blowing installation to can guarantee optical cable subunit 60's installation stability.

The cross-sectional shape of the zigzag groove 501 may be a triangle or a trapezoid, and is not specifically set here. The number of the saw-toothed grooves 501 may be set according to the pipe diameter of the micro pipe 50.

The microtube 50 is made by an extrusion device. The extrusion molding device is provided with a mold core with a sawtooth structure, when the micro tube 50 is extruded, the mold core rotates, and the rotation speed of the mold core and the extrusion linear speed of the micro tube 50 have a linear relation.

In an alternative embodiment, the diameter of the microtube 50 is 10mm, 32 sawtooth-shaped grooves 501 are arranged on the inner wall of the microtube 50, and the cross-sectional shape of the sawtooth-shaped grooves 501 is triangular.

In another alternative embodiment, the diameter of the microtube 50 is 5mm, 32 zigzag grooves 501 are arranged on the inner wall of the microtube 50, and the cross-sectional shape of the zigzag grooves 501 is trapezoidal.

Further, a low friction layer (not shown) is sprayed on the inner wall of the microtube 50, and the low friction layer is used for reducing the friction coefficient of the inner wall of the microtube 50. So set up, can be so that the inner wall of microtubule 50 is smooth to it is more smooth and easy when the air-blowing installation at optical cable subunit 60, can improve the air-blowing distance when optical cable subunit 60 air-blowing installation moreover, and then can improve the installation effectiveness.

Wherein, the material of the low friction layer does not contain polymer, such as Teflon or silicon material.

In an alternative embodiment, teflon is sprayed on the sawtooth-shaped groove 501 of the micro-tube 50, so that the wall of the sawtooth-shaped groove 501 is smoother, and thus the installation of the optical cable subunit 60 is smoother during air blowing, and the installation efficiency can be improved.

In another alternative embodiment, the silicon material is sprayed on the zigzag groove 501 of the microtube 50, so that the wall of the zigzag groove 501 is smoother, and thus the installation of the optical cable subunit 60 is smoother, and the installation efficiency can be improved.

Optionally, cable subunit 60 is one of an air-blown fiber unit, a central tube air-blown micro-cable, and a layer-twisted air-blown micro-cable.

Wherein, the air-blowing optical fiber unit is an optical fiber unit commonly used in the field of air-blowing micro cables. In some examples, the air-blown optical fiber unit includes a micro cable sheath, a resin layer, and a plurality of optical fibers, the micro cable sheath is wrapped on the outer side of the resin layer, the resin layer is wrapped on the outer side of the plurality of optical fibers, and the resin layer fixes the plurality of optical fibers as a whole. The shape enclosed by a plurality of optical fibers of the air-blowing optical fiber unit is cylindrical. In other ways, the plurality of optical fibers may also enclose other shapes, and are not specifically configured herein.

The central tube type air-blowing micro-cable is a central tube type air-blowing micro-cable commonly used in the field of air-blowing micro-cables. In some examples, the central tube type air-blown micro cable comprises a micro cable, a loose tube, an optical fiber filler and a plurality of optical fibers, wherein the micro cable is wrapped on the outer side of the loose tube, the loose tube is sleeved on the outer sides of the plurality of optical fibers, and the optical fiber filler is filled between the optical fibers and the loose tube.

Fig. 3 is a schematic structural view of the cable subunit of fig. 1. The cable sub-unit 60 in fig. 3 is a layer stranded air blown micro-cable. The layer stranded air-blown micro cable is a layer stranded air-blown micro cable commonly used in the field of air-blown micro cables. In some examples, the layer stranded air-blown micro cable comprises a micro cable sheath 61, a micro cable filler 62, a micro cable reinforcing rod 63, an optical fiber filler 64, a plurality of loose tubes 65 and a plurality of optical fibers 66, wherein the micro cable sheath 61 is wrapped outside the plurality of loose tubes 65, the micro cable reinforcing rod 63 is positioned in the center of the plurality of loose tubes 65, the micro cable filler 62 is filled in the micro cable sheath 61, the plurality of optical fibers 66 are stranded in each loose tube 65, and the optical fiber filler 64 is filled between the loose tube 65 and the optical fibers 66.

Note that, in order to distinguish the optical fiber 66 in each loose tube 65, different marks are provided on the optical fiber 66. The optical fibers 66 are marked in a manner similar to the markings on the microtube 50 and will not be described in detail herein.

Optionally, as shown in fig. 1, a water blocking gel 41 is filled in the bundling tube 40, and the water blocking gel is located between the multiple micro tubes 50, and the water blocking gel is used to ensure water blocking performance between the multiple micro tubes 50. With the arrangement, when the ADSS optical cable is applied, water seepage cannot be guaranteed between the bundling tube 40 and the plurality of micro-tubes 50, and therefore the water blocking performance among the plurality of micro-tubes 50 can be guaranteed.

Alternatively, as shown in fig. 1, the micro tube 50 is filled with a water-absorbent resin 51, and the optical cable subunit 60 is disposed in the center of the micro tube 50. With such an arrangement, when the water-swellable resin 51 absorbs water, it rapidly swells to form hydrogel, thereby achieving the purpose of blocking water.

Optionally, as shown in fig. 1, the ADSS optical cable further includes a nylon layer 70 and a non-metal armor layer, the nylon layer 70 is disposed between the inner sheath 30 and the aramid yarn layer 20, and the non-metal armor layer is embedded in the outer sheath 10. So set up, through nylon layer 70 and non-metallic armor layer, not only can improve the tensile strength of ADSS optical cable, can also reduce the destruction that rodent led to the fact the ADSS optical cable when ADSS optical cable is used to can improve the life of ADSS optical cable.

Wherein the nylon layer 70 is made of nylon material. The thickness of the nylon layer 70 is determined as needed, and is not specifically set herein. Preferably, the nylon layer 70 has a thickness of 0.5mm to 1 mm.

In this embodiment, the nylon layer 70 is selected to have a high hardness in order to reduce damage to the ADSS cable caused by rodents in the ADSS cable application.

The non-metal armor layer is made of non-metal materials. The nonmetal armor layer can be a nonmetal rod, also can be many nonmetal rods, does not do specific setting here.

Further, as shown in fig. 1 and 4, the non-metal armor layer includes a plurality of glass fiber reinforced plastic rods 81 extending along the axis of the outer sheath 10, and the plurality of glass fiber reinforced plastic rods 81 are disposed at equal intervals in the circumferential direction of the outer sheath 10. So set up, can guarantee the bending property and the tensile stability of ADSS optical cable.

Wherein, the cross section of the glass fiber reinforced plastic rod 81 may be triangular. In other implementations, the cross-section of the fiberglass reinforced plastic rod 81 can take on other shapes.

In an alternative embodiment, the cross-section of the glass fiber reinforced plastic rod 81 is triangular, the glass fiber reinforced plastic rod 81 has a first vertex angle 811, a second vertex angle 812 and a third vertex angle 813, the first vertex angle 811 faces the outside of the outer sheath 10, and the second vertex angle 812 and the third vertex angle 813 face the inside of the outer sheath 10. So set up, can make glass fiber reinforced plastic pole 81 play the effect of defending to can prevent rodent further to destroy ADSS optical cable inner structure.

Note that the outer sheath 10 is formed by an extrusion molding device. When the outer sheath 10 is extruded, triangular openings are formed in a die sleeve of the extrusion molding die, the number of the triangular openings is equal to the number of the glass fiber reinforced plastic rods 81, the size of each triangular opening is matched with that of the glass fiber reinforced plastic rods 81, the orientation of each vertex angle of each triangular opening is matched with that of each vertex angle of the glass fiber reinforced plastic rods 81, and one glass fiber reinforced plastic rod 81 is embedded into each triangular opening.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An ADSS optical cable is characterized by comprising an outer sheath, an aramid yarn layer, an inner sheath, a bundling pipe, a micro-pipe and an optical cable subunit;

a plurality of micro tubes are arranged in the bundling tube, and the micro tubes are sleeved on the outer sides of the optical cable sub-units;

different marks are arranged on the micro-tubes and used for distinguishing the micro-tubes;

the marker is a color bar or a color ring;

the inner wall of the micro-tube is provided with a plurality of sawtooth-shaped grooves, the sawtooth-shaped grooves extend spirally along the axis of the micro-tube, and the sawtooth-shaped grooves are arranged at equal intervals in the circumferential direction of the micro-tube;

the inner wall of the micro-tube is sprayed with a low-friction layer, and the low-friction layer is used for reducing the friction coefficient of the inner wall of the micro-tube.

2. The ADSS cable of claim 1, wherein the low friction layer is a teflon layer or a silicon layer.

3. An ADSS cable according to claim 1, wherein the cable sub-unit is one of an air-blown fiber unit, a central tube air-blown micro-cable, and a layer-twisted air-blown micro-cable.

4. An ADSS cable according to any one of claims 1 to 3, wherein the bundling tube is filled with a water blocking gel, the water blocking gel is located between the plurality of micro tubes, and the water blocking gel is used for ensuring water blocking performance between the plurality of micro tubes.

5. An ADSS cable according to any one of claims 1 to 3, wherein the micro tube is filled with a water-absorbent swelling resin, and the cable subunit is disposed at a center of the micro tube.

6. An ADSS cable according to any one of claims 1 to 3, further comprising a nylon layer and a non-metallic armor layer, the nylon layer being disposed between the inner jacket and the aramid yarn layer, the non-metallic armor layer being embedded within the outer jacket.

7. An ADSS cable according to claim 6, wherein the non-metallic armor layer includes a plurality of glass fiber reinforced plastic rods extending along an axis of the outer jacket, the plurality of glass fiber reinforced plastic rods being equidistantly disposed in a circumferential direction of the outer jacket;