Towed photoelectric composite cable

Abstract

The utility model provides a towed photoelectric composite cable. The towed photoelectric composite cable comprises a stranded wire, a first protection layer, a fiber reinforcement layer, a fiber fastening layer, a second protection layer, a structure reinforcement layer and a third protection layer from inside to outside, the stranded wire comprises an optical unit, small-power units, large-power units and a filling unit, the small-power units are stranded on the outer side of the optical unit, and the large-power units are stranded on the outer side of at least part of the small-power units. And the filling unit is filled in at least one of the outer side of the optical unit, between the adjacent low-power units, between the adjacent high-power units or between the low-power units and the high-power units. According to the cable, the high-power unit and the low-power unit are arranged in a matched mode, the compact degree of the cable structure is improved, meanwhile, the high-power unit is arranged on the outer side of the low-power unit, the heat dissipation capacity of the cable can be improved, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a towing optoelectronic composite cable. Background Art

[0002] Towed optical fiber composite cables are usually used in underwater environments. During the use of towed optical fiber composite cables, they usually need to be retracted and extended multiple times by winches and other devices, and they also need to bear a certain load strength during the retraction and extension process. In the related art, similar cable products usually cannot meet the use requirements after multiple load-bearing and retraction, and abnormal phenomena such as short circuits will occur. At the same time, the appearance of the cable will also be damaged or distorted to varying degrees. Utility Model Content

[0003] In order to solve the above problems, the present application provides a towing optical-electrical composite cable which has high strength, can be repeatedly retracted and deployed, and has a long service life.

[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0005] One aspect of the present application provides a towed optical-electric composite cable, which includes, from inside to outside, a twisted wire, a first protective layer, a fiber reinforcement layer, a fiber fastening layer, a second protective layer, a structural reinforcement layer and a third protective layer; the twisted wire includes an optical unit, a low-power unit, a high-power unit and a filling unit, the low-power unit is twisted on the outside of the optical unit, the high-power unit is twisted on the outside of at least part of the low-power unit, and the filling unit is filled on the outside of the optical unit, between adjacent low-power units, between adjacent high-power units, or between the low-power unit and the high-power unit. At least one place; the first protective layer is arranged on the outside of the twisted wire, the fiber reinforcement layer is arranged on the outside of the first protective layer, the fiber fastening layer is arranged on the outside of the fiber reinforcement layer, the second protective layer is arranged on the outside of the fiber fastening layer, the structural reinforcement layer is arranged on the outside of the second protective layer, and the third protective layer is arranged on the outside of the structural reinforcement layer;

[0006] The towed optical-electric composite cable also meets the following requirements: after 1800 retraction and extension tests under a tensile force of 10kN, the DC voltage withstand value of the high-power unit is greater than or equal to 6kV, the DC voltage withstand value of the low-power unit is greater than or equal to 1.2kV, the optical path loss of the optical unit is less than or equal to 0.5dB, and the breaking strength of the towed optical-electric composite cable is greater than or equal to 200kN.

[0007] Furthermore, in the twisted wire, the low-power units are twisted in pairs to form low-power unit pairs, some of the low-power unit pairs are twisted outside the optical unit to form an internal unit group, and the remaining low-power unit pairs are twisted together with the high-power units and arranged outside the internal unit group to form a twisted wire.

[0008] Furthermore, the fiber-reinforced layer includes at least one of a steel wire layer or an aramid fiber layer.

[0009] Furthermore, the fiber reinforced layer includes a first fiber layer and a second fiber layer, the first fiber layer is twisted on the outside of the first protective layer, the second fiber layer is twisted on the outside of the first fiber layer, and the twisting directions of the first fiber layer and the second fiber layer are opposite.

[0010] Furthermore, in the first fiber layer, the twist angle of the fibers is 8-15°; in the second fiber layer, the twist angle of the fibers is 8-15°.

[0011] Furthermore, at least one of the first fiber layer or the second fiber layer is an aramid fiber layer, and the twist of the aramid fibers in the aramid fiber layer is 20-50 twists.

[0012] Further, the filling unit includes at least one of filling glue, filling resin or filling wire.

[0013] Furthermore, the low-power unit is at least one of a power supply line or a communication line.

[0014] Further, the first protective layer, the second protective layer and the third protective layer are independently selected from at least one of a polyolefin insulating layer and a thermoplastic elastomer insulating layer.

[0015] The cable in this application adopts a high-power unit and a low-power unit that cooperate with each other to improve the compactness of the cable structure. At the same time, the high-power unit is set on the outside of the small-power unit, which can improve the heat dissipation capacity of the cable and increase the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a towed optical-electrical composite cable in one embodiment of the present application;

[0017] Figure 2 It is a schematic diagram of the top view of the retractable test equipment in this application;

[0018] Figure 3 This is a schematic structural diagram of a small power unit pair in a towed optoelectronic composite cable according to an embodiment of the present application;

[0019] Figure 4 This is a schematic structural diagram of an internal unit group in a towed optical-electrical composite cable in one embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the structure of the twisted wires in a towed photoelectric composite cable according to one embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of the structure of a fiber reinforcement layer in a towed photovoltaic composite cable in one embodiment of the present application;

[0022] Figure 7 This is a schematic structural diagram of a towing optoelectronic composite cable in another embodiment of the present application.

[0023] In the figure: towing optoelectronic composite cable 100, twisted wire 11, optical unit 111, low-power unit 112, high-power unit 113, filling unit 114, low-power unit pair 115, internal unit group 116, first protective layer 12, fiber reinforcement layer 13, first fiber layer 131, second fiber layer 132, fiber fastening layer 14, second protective layer 15, structural reinforcement layer 16, third protective layer 17; retractable test equipment 200, driving wheel 21, driven wheel 22. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present application, the technical scheme in the specific implementation mode of the present application will be clearly and completely described below in combination with the drawings in the implementation mode of the present application. Unless otherwise specified, the low-power unit and the high-power unit in the following technical scheme both include corresponding conductors and an insulating layer wrapped around the outside of the conductor. In the present application, the fiber is only a thin and long material with a certain flexibility, and the specific source and material are not limited. In the present application, the fiber can be either a natural fiber or a synthetic fiber, and the fiber can be either an inorganic non-metallic fiber, a metal fiber, or an organic polymer fiber.

[0025] One aspect of the present application provides a Figure 1The towed optoelectronic composite cable 100 shown is mainly used to connect the surface platform and the underwater platform during underwater operations. The towed optoelectronic composite cable 100 can transmit power and signals between the surface platform and the underwater platform. Through the towed optoelectronic composite cable 100, the surface platform can supply power to the underwater platform, and optical communication can also be carried out between the surface platform and the underwater platform. The towed optoelectronic composite cable 100 includes a twisted wire 11, a first protective layer 12, a fiber reinforcement layer 13, a fiber fastening layer 14, a second protective layer 15, a structural reinforcement layer 16 and a third protective layer 17. The twisted wire 11 is responsible for the power transmission and signal transmission functions of the towed optoelectronic composite cable 100. The first protective layer 12, the fiber reinforcement layer 13, the fiber fastening layer 14, the second protective layer 15, the structural reinforcement layer 16 and the third protective layer 17 are mainly responsible for providing and ensuring the strength of the towed optoelectronic composite cable 100. Specifically, the first protective layer 12 is arranged on the outside of the twisted wire 11, and the units inside the twisted wire 11 are tightly bound together to form an integral structure. At the same time, the first protective layer 12 plays a role of water isolation, etc., which can prevent the twisted wire 11 from being eroded by water. The fiber reinforcement layer 13 is arranged on the outside of the first protective layer 12. The fiber reinforcement layer 13 can increase the overall breaking strength of the towed optoelectronic composite cable 100 and improve the ability of the towed optoelectronic composite cable 100 to be repeatedly retracted and used. The fiber compacting layer is arranged on the outside of the fiber reinforcement layer 13, which can bind the fiber reinforcement layer 13 and control the overall density of the towed optoelectronic composite cable 100 and improve the breaking strength. The second protective layer 15 is arranged on the outside of the fiber fastening layer 14. The second protective layer 15 can enable the fiber fastening layer 14, the fiber reinforcement layer 13 and the first protective layer 12 to form a tighter whole and wrap around the outside of the twisted wire 11, enhance the integrity of the towed optoelectronic composite cable 100 and improve the breaking strength of the towed optoelectronic composite cable 100. At the same time, the second protective layer 15 also plays a role of water isolation, preventing moisture from entering the fiber reinforcement layer 13 and the fiber fastening layer 14 to corrode the fiber reinforcement layer 13 and the fiber fastening layer 14. The structural reinforcement layer 16 is arranged on the outside of the second protective layer 15, and the structural reinforcement layer 16 can improve the performance of the towed optical fiber composite cable 100 in resisting external tensile force and shear force. The third protective layer 17 is arranged on the outside of the structural reinforcement layer 16, and the third protective layer 17 can improve the integrity of the towed optical fiber composite cable 100, and also plays a role of blocking moisture.

[0026] like Figure 1As shown in , the twisted wire 11 includes an optical unit 111, a low-power unit 112, a high-power unit 113 and a filling unit 114. The optical unit 111 is arranged in the middle position of the twisted wire 11, the low-power unit 112 and the high-power unit 113 are twisted and arranged on the outside of the optical unit 111, and the filling unit 114 is arranged in the gap between the optical unit 111, the low-power unit 112 and the high-power unit 113. Specifically, a structural unit composed of a part of the low-power unit 112 is first arranged on the outside of the optical unit 111, and then a structural unit composed of the remaining low-power unit 112 and the high-power unit 113 is arranged. The filling unit 114 can be filled between adjacent low-power units 112, the filling unit 114 can be filled between adjacent high-power units 113, the filling unit 114 can also be filled between the high-power unit 113 and the low-power unit 112, and the filling unit 114 can also be filled between the high-power unit 113 and the low-power unit 112. The filling unit 114 fills the gaps between the units in the twisted wire 11 as much as possible, thereby reducing the space inside the twisted wire 11 .

[0027] During the use of the towed optoelectronic composite cable 100 of the present application, the underwater platform usually includes special equipment and conventional electrical appliances. The power required by the special equipment is relatively large, and a large-power unit 113 with a larger cross-sectional area is required to power it, otherwise problems such as insufficient power supply and severe heating are likely to occur, which will affect the operation of the entire system. Conventional electrical appliances include lighting and other equipment. The power required by these conventional electrical appliances is relatively small, and the small-power unit 112 with a smaller cross-sectional area can already meet the use requirements. In the present application, a high-power unit 113 and a small-power unit 112 are used to cooperate with each other to meet the power supply and use requirements of special equipment and conventional electrical appliances, respectively. The small-power unit 112 can be used to fill the gap in the high-power unit 113 to improve the compactness of the towed optoelectronic composite cable 100. At the same time, the weight of the towed optoelectronic composite cable 100 can also be reduced while meeting the use requirements, which is convenient for improving the use scope of the towed optoelectronic composite cable 100 in the present application.

[0028] In the towed optoelectronic composite cable 100 of the present application, the high-power unit 113 usually needs to bear a large amount of electricity, and the high-power unit 113 will inevitably generate a large amount of heat during operation. If the heat generated by the high-power unit 113 cannot be dissipated in time, the heat will accumulate inside the towed optoelectronic composite cable 100. The accumulated heat will not only affect the operation of the high-power unit 113 itself, but also affect the low-power unit 112 and the structure including the protective layer and the fiber reinforced layer 13. Specifically, the heat resistance of each insulating layer and structural reinforcement component in the towed optoelectronic composite cable 100 is usually limited. The heat accumulated inside the towed optoelectronic composite cable 100 will affect the structural performance of the above-mentioned components, causing the above-mentioned components to soften, resulting in a decrease in the mechanical properties of the above-mentioned components, reducing the overall strength of the towed optoelectronic composite cable 100, and even causing damage and distortion. Arranging the high-power unit 113 to the outside can improve the heat dissipation capacity of the towed optoelectronic composite cable 100, so that the heat generated by the operation of the high-power unit 113 in the towed optoelectronic composite cable 100 can be promptly dissipated to the outside of the towed optoelectronic composite cable 100, reducing the impact of heat accumulation on the performance and structure of the towed optoelectronic composite cable 100. The low-power unit 112 generates less heat when working, and the small-power unit 112 arranged inside will not cause heat dissipation problems, and will not cause heat accumulation. In addition, in the towed optoelectronic composite cable 100 of the present application, the small-power unit 112 arranged inside can not only be used as a power supply unit, but also as a signal transmission unit when necessary. At this time, the high-power unit 113 and the small-power unit 112 arranged outside can also play a shielding role to prevent external signals from interfering with the signal transmission in the small-power unit 112, which can improve the stability of signal transmission in extreme cases.

[0029] In the towed optoelectronic composite cable 100 of the present application, if only the high-power unit 113 and the low-power unit 112 are included, there are many gaps in the towed optoelectronic composite cable 100, and the high-power unit 113 and the low-power unit 112 cannot be tightly combined. There are many deformable spaces inside the towed optoelectronic composite cable 100, resulting in poor stability inside the towed optoelectronic composite cable 100, reducing the practical life of the towed optoelectronic composite cable 100. Inside the towed optoelectronic composite cable 100, especially around the high-power unit 113 and the low-power unit 112, some filling units 114 are appropriately arranged to fill the gaps in the towed optoelectronic composite cable 100, reduce and eliminate the deformable space inside the towed optoelectronic composite cable 100, improve the stability inside the towed optoelectronic composite cable 100, and avoid abnormal conditions such as bulging, dents or damage of the protective layer arranged on the outside of the twisted wire 11 due to pressure.

[0030] The towed optical-electric composite cable 100 after the above configuration in the embodiment of the present application also meets the following requirements: after 1800 times of retraction and extension test under 10kN tension, the DC voltage withstand value of the high-power unit 113 is greater than or equal to 6kV, the DC voltage withstand value of the low-power unit 112 is greater than or equal to 1.2kV, the optical path loss of the optical unit 111 is less than or equal to 0.5dB, and the breaking strength of the towed optical-electric composite cable 100 is greater than or equal to 200kN. Specifically, the retraction and extension test can be carried out as follows: Figure 2 The test equipment 200 shown in the drawing is tested. The test equipment includes a driving wheel 21 and a driven wheel 22. During the test, the towed optoelectronic composite cable 100 is connected end to end and arranged around the driving wheel 21 and the driven wheel 22 in a circle, and the driving wheel 21 in the test equipment rotates in a clockwise and counterclockwise manner until the test is completed. After the test is completed, the electrical and mechanical properties of the towed optoelectronic composite cable 100 are tested. In the towed optoelectronic composite cable 100 in the present application, a high-power unit 113 and a low-power unit 112 are set, and the positional relationship of the high-power unit 113 outside the low-power unit 112 is set. At the same time, the towed optoelectronic composite cable 100 is also provided with a filling unit 114 and a fiber reinforced layer 13 and other structures. The electrical and mechanical properties of the towed optoelectronic composite cable 100 have been significantly improved. At the same time, the optical unit 111 of the towed optoelectronic composite cable 100 can also be well protected, reducing the optical path loss during use.

[0031] As an optional embodiment, the optical unit 111 may specifically include an optical fiber and a protective sleeve, the optical fiber is located at the center of the optical unit 111, the protective sleeve is arranged on the outside of the optical fiber, and a filling medium such as grease is filled between the protective sleeve and the optical fiber. In the optical unit 111, the optical fiber is responsible for signal transmission, and the protective sleeve and the filling medium can improve the reliability of the use of the optical unit 111. Specifically, the protective sleeve can be a stainless steel loose sleeve, which can improve the protection effect of the optical fiber in the optical unit 111. The optical unit 111 may have 4-core optical fibers.

[0032] As an optional embodiment, the conductors in the low-power unit 112 and the high-power unit 113 can be tinned copper wires. Tinned copper wires can better prevent oxidation of copper materials. At the same time, the operability in the subsequent welding process can also be improved. The insulating layer in the low-power unit 112 and the high-power unit 113 can be made of fluorine-containing resin materials through extrusion and other processes. The fluorine-containing resin material has excellent high temperature and high voltage resistance, which can ensure that the insulating layer will not soften and discharge between conductors in a high current and high voltage use environment.

[0033] As an optional implementation, in the twisted wire 11, the small power units 112 are twisted in pairs to form Figure 3The low-power unit pairs 115 shown in FIG. 1 are partially twisted outside the optical unit 111 to form a Figure 4 The internal unit group 116 shown in FIG. 1 is a structure in which the remaining low-power unit pairs 115 and the high-power unit 113 are twisted together and arranged outside the internal unit group 116 to form a structure as shown in FIG. Figure 5 The twisted wire 11 shown. In the twisted wire 11, the small power units 112 are twisted in pairs to form a small power unit pair 115 in the form of a twisted pair. The small power unit pair 115 has a larger size relative to the small power unit 112, and the size of the small power unit pair 115 is close to the large power unit 113. The small power unit pair 115 and the large power unit 113 are twisted together to increase the compactness of the twisted wire 11 and reduce useless space such as gaps in the twisted wire 11. In addition, since the small power unit 112 in the present application can also perform signal transmission when necessary, twisting the small power units 112 in pairs to form a small power unit pair 115 in the form of a twisted pair can also enhance the anti-interference ability of the small power unit pair 115 and enhance the stability of signal transmission. At the same time, the small power unit pair 115 in the form of a twisted pair will not have an adverse effect on power transmission. After the low-power units 112 are twisted to form the low-power unit pairs 115, some of the low-power unit pairs 115 are twisted outside the optical unit 111 to form the internal unit group 116. This arrangement can make the structure of the internal unit group 116 more compact. The arrangement of some of the low-power unit pairs 115 outside the internal unit group 116 and twisting them together with the high-power units 113 outside the internal unit group 116 can increase the number of low-power units 112 in the towed optical-electrical composite cable 100 of the present application, expand the application scope of the towed optical-electrical composite cable 100 of the present application, and can also use the low-power unit pairs 115 to fill the gaps between the high-power units 113, making full use of the space in the twisted wire 11.

[0034] As an optional embodiment, the fiber reinforced layer 13 includes at least one of a steel wire layer or an aramid fiber layer. The fiber reinforced layer 13 can be selected from a steel wire layer formed by twisting and winding steel wires or an aramid fiber layer formed by twisting and winding aramid fibers according to specific usage requirements. When a steel wire layer is used as the fiber reinforced layer 13, it is necessary to pre-deform the steel wires in the steel wire layer to reduce the residual stress of the steel wires. When aramid fibers are used as the fiber reinforced layer 13, it is necessary to pre-twist the aramid fibers so that each aramid fiber bundle can form a tight whole, thereby improving the strength utilization rate of the aramid fibers and improving the tensile strength and use stability of the towed optoelectronic composite cable 100.

[0035] As an optional implementation, Figure 6The fiber reinforced layer 13 shown includes a first fiber layer 131 and a second fiber layer 132. The first fiber layer 131 is twisted on the outside of the first protective layer 12, and the second fiber layer 132 is twisted on the outside of the first fiber layer 131. The twisting directions of the first fiber layer 131 and the second fiber layer 132 are opposite. In the fiber reinforced layer 13 of the present application, a double-layer fiber layer design is adopted, and two layers of fibers are twisted and wound on the outside of the protective layer in sequence, and the twisting directions of the two fiber layers are set in opposite directions. Specifically, when the first fiber layer 131 is set to be twisted in the left direction, the second fiber layer 132 is set to be twisted in the right direction, and when the first fiber layer 131 is set to be twisted in the right direction, the second fiber layer 132 is set to be twisted in the left direction. The setting of the above-mentioned reverse twisting structure can ensure that when the fiber reinforced layer 13 is subjected to stress, the radial components of the tension on the towed optoelectronic composite cable 100 offset each other, avoiding the distortion that may occur during the same-direction twisting, which reduces the breaking strength of the fiber reinforced layer 13 and the towed optoelectronic composite cable 100, and improves the service life of the towed optoelectronic composite cable 100.

[0036] As an optional embodiment, in the first fiber layer 131, the twist angle of the fibers is 8°-15°; in the second fiber layer 132, the twist angle of the fibers is 8°-15°. The twist angle is the angle between the fiber bundle and the radial direction of the towed optoelectronic composite cable 100. In the towed optoelectronic composite cable 100 of the present application, the twist angle of the fibers in the fiber reinforcement layer 13 has been accurately calculated, and the twist angle of the fibers in the first fiber layer 131 and the second fiber layer 132 is controlled within the range of 8°-15°, which can avoid the fiber reinforcement layer 13 and the towed optoelectronic composite cable 100 from twisting during use, thereby improving the durability of the towed optoelectronic composite cable 100.

[0037] As an optional embodiment, at least one of the first fiber layer 131 or the second fiber layer 132 is an aramid fiber layer, and the twist of the aramid fiber in the aramid fiber layer is 20-50 twists. Controlling the twist of the aramid fiber to 20-50 twists can enable each aramid fiber bundle to form a tight whole, improve the strength utilization of the aramid fiber, and improve the tensile strength and use stability of the towed optical-electric composite cable 100.

[0038] As an optional implementation, the low-power unit 112 is at least one of a power supply line or a communication line. The low-power unit 112 can be selected as a simple power supply harness or a simple communication harness according to actual needs, or a harness that can be converted between the power supply harness and the communication harness when necessary, or a harness that includes both power supply and communication functions. When the low-power unit 112 has a communication function, a shielding layer is set between the low-power unit 112 and the high-power unit 113 to prevent external signals from interfering with signal transmission in the low-power unit 112, which can improve the stability of signal transmission in extreme cases.

[0039] As an optional embodiment, the filling unit 114 includes at least one of filling glue, filling resin or filling line. In the present application, the filling unit 114 can be a filling glue for bonding adjacent low-power units 112 and / or high-power units 113, the filling unit 114 can also be a filling resin filled in adjacent low-power units 112 and / or high-power units 113, and the filling unit 114 can also be a filling line similar in shape to the low-power unit 112 and / or high-power unit 113. The filling glue and the filling resin are basically in an amorphous state. The use of filling glue or filling resin can better fill the gap between the low-power unit 112 and / or the high-power unit 113, avoid the appearance of deformable space inside the towing optical-electric composite cable 100, and reduce damage during use. The filling line is in a fixed state and has a certain strength and toughness. In addition, the filling line has a similar shape to the low-power unit 112 or the high-power unit 113. The filling line can not only fill the gap more conveniently, but also provide support for the low-power unit 112 and the high-power unit 113. Of course, it is not enough to only use filling wires to fill the gaps between the towing optoelectronic composite cables 100. Gaps will still appear around the filling wires. When using filling wires, it is also necessary to use filling glue or filling resin to fill the gaps around the filling wires to ensure that there are almost no unfilled gaps inside the towing optoelectronic composite cable 100.

[0040] As an optional embodiment, the structural reinforcement layer 16 can be made of high-strength fiber material. The structural reinforcement layer 16 is arranged between the second protective layer 15 and the third protective layer 17, which is equivalent to adding a reinforcing rib structure to the protective structure composed of the second protective layer 15 and the third protective layer 17. The reinforcing rib structure can improve the performance of the aforementioned protective structure in resisting tensile force and shear force. The use of high-strength fiber material as the main material of the structural reinforcement layer 16 can also better control the overall density of the towed optoelectronic composite cable 100 and give the towed optoelectronic composite cable 100 high breaking strength. Specifically, the high-strength fiber material can be selected from fiber materials with high strength properties such as aramid fiber or polyethylene fiber.

[0041] As an optional embodiment, the first protective layer 12, the second protective layer 15 and the third protective layer 17 are independently selected from at least one of a polyolefin insulation layer or a thermoplastic elastomer insulation layer. The first protective layer 12, the second protective layer 15 and the third protective layer 17 mainly block water and provide a certain strength. The corresponding protective layers made of polyolefin resin and thermoplastic elastomer resin have the characteristics of high wear resistance, high strength and high toughness, which can ensure that the towing optical-electric composite cable 100 will not have damage to the protective layer and water seepage during operation, thereby ensuring the safety and service life of the towing optical-electric composite cable 100.

[0042] also, Figure 7 A more specific implementation of the present application is also shown, in which the towed optoelectronic composite cable 100 is provided with an optical unit 111 containing 4-core optical fibers, a 4-core high-power unit 113 and a 24-core low-power unit 112. The 24-core low-power units 112 are twisted in pairs to form 12 pairs of low-power unit pairs 115, of which 5 pairs of low-power unit pairs 115 are twisted around the optical unit 111 to form an internal unit group 116, and the remaining 7 pairs of low-power unit pairs 115 are twisted together with the 4-core high-power units 113 around the internal unit group 116 to form a twisted wire 11, and then the aforementioned first protective layer 12, fiber reinforcement layer 13, fiber fastening layer 14, second protective layer 15, structural reinforcement layer 16 and third protective layer 17 are sequentially arranged outside the twisted wire 11 to finally form the towed optoelectronic composite cable 100.

[0043] Another aspect of the present application further provides a method for preparing the above-mentioned towing optical-electrical composite cable 100, and the preparation method specifically comprises the following steps:

[0044] Twisting: The small power units 112 are twisted in pairs and a filling unit 114 is provided to obtain a small power unit pair 115.

[0045] Twisting: twisting some low-power unit pairs 115 on the outside of the optical unit 111 and setting the filling unit 114 to obtain the internal unit group 116, twisting the remaining low-power unit pairs 115 and the high-power unit 113 together on the outside of the internal unit group 116 and setting the filling unit 114 to obtain the twisted wire 11;

[0046] The first protective layer 12, the fiber reinforcement layer 13, the fiber fastening layer 14, the second protective layer 15, the structural reinforcement layer 16 and the third protective layer 17 are sequentially arranged on the outer side of the twisted wire 11 to obtain the towed optical fiber composite cable 100.

[0047] In the above preparation method, the first protective layer 12, the second protective layer 15 and the third protective layer 17 can be prepared by extrusion, and the fiber reinforcement layer 13, the fiber fastening layer 14 and the structural reinforcement layer 16 can be prepared by weaving and other processes. The filling wire in the filling unit 114 is twisted together with the low-power unit 112, the high-power unit 113 or the low-power unit pair 115, and the filling glue and filling resin in the filling unit 114 can be filled into the corresponding gap by injection or dipping.

[0048] As an optional embodiment, the low-power unit 112 and the high-power unit 113 include an outermost insulating layer, the insulating layer includes at least one of a polyolefin insulating layer or a thermoplastic elastomer insulating layer, and the first protective layer 12, the second protective layer 15 and the third protective layer 17 are independently selected from at least one of a polyolefin insulating layer or a thermoplastic elastomer insulating layer. The outermost insulating layer of the low-power unit 112 and the high-power unit 113 can play the role of insulation and water blocking, and the insulating layer made of polyolefin resin and thermoplastic elastomer resin can ensure the insulation and water blocking effect. The first protective layer 12, the second protective layer 15 and the third protective layer 17 mainly have the functions of water blocking and providing a certain strength. The corresponding protective layers made of polyolefin resin and thermoplastic elastomer resin have the characteristics of high wear resistance, high strength and high toughness, which can ensure that the towing optical-electric composite cable 100 will not have the protective layer damage and water seepage during the working process, and ensure the use safety and service life of the towing optical-electric composite cable 100.

[0049] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A towing optical-electric composite cable, characterized in that: include: A twisted wire, the twisted wire comprising an optical unit, a low-power unit, a high-power unit and a filling unit, the low-power unit is twisted outside the optical unit, the high-power unit is twisted outside at least part of the low-power unit, and the filling unit is filled at least one place outside the optical unit, between adjacent low-power units, between adjacent high-power units, or between the low-power unit and the high-power unit; A first protective layer, the first protective layer being arranged on the outside of the twisted wire; A fiber-reinforced layer, wherein the fiber-reinforced layer is arranged on the outer side of the first protective layer; A fiber fastening layer, the fiber fastening layer being arranged on the outer side of the fiber reinforcement layer; a second protective layer, the second protective layer being arranged on the outer side of the fiber fastening layer; A structural reinforcement layer, wherein the structural reinforcement layer is arranged on the outer side of the second protective layer; a third protective layer, the third protective layer being arranged on the outer side of the structural reinforcement layer; The trailing optical-electric composite cable also meets the following requirements: After 1800 retraction and extension tests under a tensile force of 10kN, the DC voltage withstand value of the high-power unit is greater than or equal to 6kV, the DC voltage withstand value of the low-power unit is greater than or equal to 1.2kV, the optical path loss of the optical unit is less than or equal to 0.5dB, and the breaking strength of the towing optoelectronic composite cable is greater than or equal to 200kN.

2. The towing optical-electrical composite cable according to claim 1, characterized in that: In the twisted wire, the low-power units are twisted in pairs to form low-power unit pairs, some of the low-power unit pairs are twisted outside the optical unit to form an internal unit group, and the remaining low-power unit pairs are twisted together with the high-power units and arranged outside the internal unit group to form a twisted wire.

3. The towing optical-electrical composite cable according to claim 1, characterized in that: The fiber-reinforced layer includes at least one of a steel wire layer and an aramid fiber layer.

4. The towing optical-electrical composite cable according to claim 1, characterized in that: The fiber reinforced layer includes a first fiber layer and a second fiber layer. The first fiber layer is twisted on the outside of the first protective layer, and the second fiber layer is twisted on the outside of the first fiber layer. The twisting directions of the first fiber layer and the second fiber layer are opposite.

5. The towing optical-electric composite cable according to claim 4, characterized in that: In the first fiber layer, the twist angle of the fibers is 8-15°.

6. The towing optical-electric composite cable according to claim 4, characterized in that: In the second fiber layer, the twist angle of the fibers is 8-15°.

7. The towing optical-electrical composite cable according to claim 4, characterized in that: At least one of the first fiber layer or the second fiber layer is an aramid fiber layer, and the twist of the aramid fiber in the aramid fiber layer is 20-50 twists.

8. The towing optical-electrical composite cable according to claim 1, characterized in that: The filling unit includes at least one of filling glue, filling resin or filling wire.

9. The towing optical-electrical composite cable according to claim 1, characterized in that: The low-power unit is at least one of a power supply line or a communication line.

10. The towing optical-electrical composite cable according to claim 1, characterized in that: The first protective layer, the second protective layer and the third protective layer are independently selected from at least one of a polyolefin insulating layer and a thermoplastic elastomer insulating layer.

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