Watertight cable

Abstract

One aspect of the utility model provides a watertight cable. The watertight cable comprises a stranded wire, a protective layer and a reinforcing layer, the stranded wire comprises low-power units, high-power units and filling units, the high-power units are stranded on the outer sides of the low-power units, and the filling units are arranged at least one position between the adjacent low-power units, between the adjacent high-power units or between the low-power units and the high-power units; the protection layer wraps the outer side of the stranded wire, and the enhancement layer wraps the outer side of the protection layer. 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 watertight cable. Background Art

[0002] Watertight cables are usually used in underwater environments. During the use of watertight 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 retraction and extension, 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 watertight 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 watertight cable, which includes a twisted wire, a protective layer and a reinforcing layer; the twisted wire includes a low-power unit, a high-power unit and a filling unit, the high-power unit is twisted outside the low-power unit, and the filling unit is provided at least one place between adjacent low-power units, between adjacent high-power units, or between a low-power unit and a high-power unit; the protective layer is coated on the outside of the twisted wire, and the reinforcing layer is coated on the outside of the protective layer;

[0006] Watertight cables also meet the following requirements,

[0007] 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 small-power unit is greater than or equal to 1.2kV, and the breaking strength of the watertight cable is greater than or equal to 120kN.

[0008] Furthermore, in the twisted wire, the low-power units are twisted in pairs to form a low-power unit pair, the low-power unit pairs are twisted together to form a low-power unit group, the high-power units are twisted and arranged outside the small-power unit group; a filling unit is arranged in the middle of the small-power unit group.

[0009] Furthermore, the reinforcement layer includes at least one of a steel wire layer or an aramid fiber layer.

[0010] Furthermore, the reinforcing layer includes a first fiber layer and a second fiber layer, the first fiber layer is twisted on the outside of the 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.

[0011] Furthermore, in the first fiber layer, the twist angle of the fibers is 8-15°.

[0012] Furthermore, in the second fiber layer, the twist angle of the fibers is 8-15°.

[0013] 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.

[0014] Furthermore, the low-power unit is at least one of a power supply line or a communication line.

[0015] Furthermore, a shielding layer is provided between the low-power unit and the high-power unit.

[0016] Further, the filling unit includes at least one of filling glue, filling resin or filling wire.

[0017] 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

[0018] Figure 1 This is a schematic diagram of the structure of a watertight cable in one embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of the top view of the retractable test equipment in this application;

[0020] Figure 3 This is a schematic diagram of the structure of a small power unit pair in a watertight cable according to an embodiment of the present application;

[0021] Figure 4 This is a structural schematic diagram of a small power unit group of a watertight cable in one embodiment of the present application;

[0022] Figure 5 This is a schematic diagram of the structure of twisted wires in a watertight cable in one embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of the structure of a reinforcement layer in a watertight cable in one embodiment of the present application;

[0024] Figure 7 This is a schematic structural diagram of a watertight cable in another embodiment of the present application.

[0025] In the figure: a watertight cable 100, a twisted wire 11, a low-power unit 111, a high-power unit 112, a filling unit 113, a filling wire 1131, a low-power unit pair 114, a low-power unit group 115, a protective layer 12, a reinforcing layer 13, a first fiber layer 131, a second fiber layer 132; a retractable test device 200, a driving wheel 21, and a driven wheel 22. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the present application, the technical solutions in the specific implementation of the present application will be described clearly and completely in conjunction with the drawings in the implementation of the present application. Unless otherwise specified, the low-power unit and the high-power unit in the following technical solutions both include corresponding conductors and an insulating layer wrapped around the outside of the conductors.

[0027] One aspect of the present application provides a Figure 1 The watertight cable 100 shown is used to connect the surface platform and the underwater platform during underwater operations. The watertight cable 100 can be used for power transmission between the surface platform and the underwater platform, and can also be used for signal transmission when necessary. The watertight cable 100 includes a twisted wire 11, a protective layer 12 and a reinforcing layer 13. The twisted wire 11 is responsible for the power transmission and signal transmission functions of the watertight cable 100. The 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 protective layer 12 can play a role in water isolation to prevent the twisted wire 11 from being eroded by water. The reinforcing layer 13 is arranged on the outside of the protective layer 12. The reinforcing layer 13 can increase the overall breaking strength of the watertight cable 100 and improve the ability of the watertight cable 100 to be repeatedly retracted and released.

[0028] The twisted wire 11 includes a small power unit 111, a large power unit 112 and a filling unit 113. The large power unit 112 is twisted on the outside of the small power unit 111. The filling unit 113 is used to fill the various gaps generated after the large power unit 112 and the small power unit 111 are twisted. Specifically, the filling unit 113 can be filled between adjacent small power units 111, the filling unit 113 can also be filled between adjacent large power units 112, and the filling unit 113 can also be filled between the small power unit 111 and the large power unit 112.

[0029] During the use of the watertight 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 112 with a large 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, computing and information processing equipment. The power required by these conventional electrical appliances is relatively small, and the small-power unit 111 with a small cross-sectional area can already meet the use requirements. In the present application, the high-power unit 112 and the low-power unit 111 are used to cooperate with each other to meet the power supply and use requirements of special equipment and conventional electrical appliances, respectively. The low-power unit 111 can be used to fill the gap in the high-power unit 112 to improve the compactness of the watertight cable 100. At the same time, the weight of the watertight cable 100 can also be reduced while meeting the use requirements, which is convenient for improving the scope of use of the watertight cable 100 in the present application.

[0030] In the watertight cable 100 of the present application, the high-power unit 112 usually needs to bear a large amount of electricity, and the high-power unit 112 will inevitably generate a large amount of heat during operation. If the heat generated by the high-power unit 112 cannot be dissipated in time, the heat will accumulate inside the watertight cable 100. The accumulated heat will not only affect the operation of the high-power unit 112 itself, but also affect the low-power unit 111 and the structure including the protective layer 12 and the reinforcement layer 13. Specifically, the heat resistance of each insulating layer and structural reinforcement component in the watertight cable 100 is usually limited. The heat accumulated inside the watertight cable 100 will affect the structural performance of the above components, soften the above components, and cause the mechanical properties of the above components to decrease, thereby reducing the overall strength of the watertight cable 100, and even causing damage and distortion. Setting the high-power unit 112 outside can improve the heat dissipation capacity of the watertight cable 100, so that the heat generated by the operation of the high-power unit 112 in the watertight cable 100 can be promptly dissipated outside the watertight cable 100, reducing the impact of heat accumulation on the performance and structure of the watertight cable 100. The low-power unit 111 generates less heat when working, and the low-power unit 111 is set inside and will not cause heat dissipation problems or heat accumulation. In addition, in the watertight cable 100 of the present application, the low-power unit 111 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 112 set outside can also play a shielding role to prevent external signals from interfering with the signal transmission in the small-power unit 111, which can improve the stability of signal transmission in extreme cases.

[0031] In the watertight cable 100 of the present application, if only the high-power unit 112 and the low-power unit 111 are included, there are many gaps in the watertight cable 100, and the high-power unit 112 and the low-power unit 111 cannot be tightly combined. There are many deformable spaces inside the watertight cable 100, resulting in poor stability inside the watertight cable 100, reducing the practical life of the watertight cable 100. Some filling units 113 are appropriately arranged inside the watertight cable 100, especially around the high-power unit 112 and the low-power unit 111, to fill the gaps in the watertight cable 100, reduce and eliminate the deformable space inside the watertight cable 100, improve the stability inside the watertight cable 100, and avoid abnormal conditions such as bulging, dents or damage of the protective layer 12 arranged on the outside of the twisted wire 11 due to pressure.

[0032] The watertight cable 100 after the above configuration in the embodiment of the present application can meet the following requirements: after 1800 times of retraction and extension test under 10kN tension, the DC voltage withstand value of the high power unit 112 is greater than or equal to 6kV, the DC voltage withstand value of the low power unit 111 is greater than or equal to 1.2kV, and the breaking strength of the watertight cable 100 is greater than or equal to 120kN. Specifically, the retraction and extension test can be carried out as follows: Figure 2 The test equipment 200 shown in the drawing and releasing test is used for testing. The test equipment includes a driving wheel 21 and a driven wheel. During the test, the watertight cable 100 is connected end to end and arranged around the driving wheel 21 and the driven wheel in one circle. The driving wheel 21 in the test equipment rotates alternately in a clockwise and counterclockwise manner until the test is completed. After the test is completed, the electrical and mechanical properties of the watertight cable 100 are tested. A high-power unit 112 and a low-power unit 111 are provided in the watertight cable 100 in the present application, and the positional relationship of the high-power unit 112 outside and the low-power unit 111 inside is set. At the same time, the watertight cable 100 is also provided with a filling unit 113 and a reinforcement layer 13 and other structures. The electrical and mechanical properties of the watertight cable 100 are significantly improved.

[0033] As an optional embodiment, the conductors in the low-power unit 111 and the high-power unit 112 can be tinned copper wires. Tinned copper wires can better prevent oxidation of copper materials. At the same time, it can also improve operability during subsequent welding processes. The insulation layer in the low-power unit 111 and the high-power unit 112 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, and can ensure that the insulation layer will not soften and discharge between conductors in a high current and high voltage use environment.

[0034] As an optional implementation, in the twisted wire 11, the small power units 111 are twisted in pairs to form Figure 3The small power unit pair 114 is further twisted together to form a Figure 4 The high power unit 112 is twisted and arranged outside the low power unit group 115 to form a Figure 5 The twisted wire 11 shown. In the twisted wire 11, the low-power units 111 are twisted in pairs to form a small-power unit pair 114 in the form of a twisted pair. Since the low-power units 111 in the present application can transmit signals when necessary, twisting the small-power units 111 in pairs to form a twisted pair can enhance the anti-interference ability of the small-power units 111 and enhance the stability of signal transmission. At the same time, the small-power unit pair 114 in the form of a twisted pair will not have an adverse effect on power transmission. After the small-power units 111 are twisted to form the small-power unit pairs 114, all the small-power unit pairs 114 are twisted together to form a small-power unit group 115. This arrangement can make the structure of the small-power unit group 115 more compact.

[0035] As an optional implementation, Figure 5 As shown, a filling unit 113 is provided in the middle of the low-power unit group 115. The filling unit 113 is provided in the middle of the low-power unit group 115, which can not only fill the gap between the low-power unit pairs 114, but also play a role in supporting the low-power unit pairs 114. Specifically, a filling line 1131 having a wire diameter substantially the same as that of the low-power unit pairs 114 is provided in the middle of the low-power unit group 115.

[0036] As an optional embodiment, the reinforcement layer 13 includes at least one of a steel wire layer or an aramid fiber layer. The reinforcement layer 13 can be 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 use requirements. When a steel wire layer is used as the reinforcement layer 13, the steel wires in the steel wire layer need to be pre-deformed to reduce the residual stress of the steel wires. When aramid fibers are used as the reinforcement layer 13, the aramid fibers need to be twisted and pre-treated 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 watertight cable 100.

[0037] As an optional implementation, Figure 6The reinforcement layer 13 shown includes a first fiber layer 131 and a second fiber layer 132, wherein the first fiber layer 131 is twisted on the outside of the protective layer 12, and the second fiber layer 132 is twisted on the outside of the first fiber layer 131, and the twisting directions of the first fiber layer 131 and the second fiber layer 132 are opposite. In the reinforcement layer 13 of the present application, a double-layer fiber layer design is adopted, and the two layers of fibers are twisted and wound on the outside of the protective layer 12 in sequence, and the twisting directions of the two fiber layers are set in opposite directions. Among them, the fiber here 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. 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 reinforcement layer 13 is subjected to stress, the radial components of the tension on the watertight cable 100 offset each other, avoiding the distortion that may occur during the same-direction twisting, which reduces the breaking strength of the reinforcement layer 13 and the watertight cable 100, and improves the service life of the watertight cable 100.

[0038] 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 watertight cable 100. In the watertight cable 100 of the present application, the twist angle of the fibers in the reinforcing layer 13 is 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 reinforcing layer 13 and the watertight cable 100 from twisting during use, thereby improving the durability of the watertight cable 100.

[0039] 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 watertight cable 100.

[0040] As an optional implementation, the low-power unit 111 is at least one of a power supply line or a communication line, and a shielding layer is also provided between the low-power unit 111 and the high-power unit 112. The low-power unit 111 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 111 has a communication function, a shielding layer is provided between the low-power unit 111 and the high-power unit 112 to prevent external signals from interfering with signal transmission in the low-power unit 111, which can improve the stability of signal transmission in extreme cases.

[0041] As an optional embodiment, the filling unit 113 includes at least one of filling glue, filling resin or filling line 1131. In the present application, the filling unit 113 may be a filling glue for bonding adjacent low-power units 111 and / or high-power units 112, the filling unit 113 may also be a filling resin filled in adjacent low-power units 111 and / or high-power units 112, and the filling unit 113 may also be a filling line 1131 similar in shape to the low-power unit 111 and / or high-power unit 112. The filling glue and the filling resin are basically in an amorphous state, and the use of the filling glue or the filling resin can better fill the gap between the low-power unit 111 and / or the high-power unit 112, avoid the appearance of a deformable space inside the watertight cable 100, and reduce damage during use. The filling wire 1131 is in a fixed state and has certain strength and toughness. In addition, the filling wire 1131 has a similar shape to the small power unit 111 or the large power unit 112. The filling wire 1131 can not only fill the gap more conveniently, but also provide support for the small power unit 111 and the large power unit 112. Of course, it is not enough to only use the filling wire 1131 to fill the gap between the watertight cables 100. There will still be gaps around the filling wire 1131. When using the filling wire 1131, it is also necessary to use filling glue or filling resin to fill the gap around the filling wire 1131 to ensure that there is almost no unfilled gap inside the watertight cable 100.

[0042] also, Figure 7A more specific embodiment of the present application is also shown. The watertight cable 100 is provided with 8-core high-power units 112 and 8-core low-power units 111. The 8 low-power units 111 are twisted in pairs to form 4 pairs of low-power unit pairs 114, and then the 4 pairs of low-power unit pairs 114 are twisted around a filling wire 1131 to form a low-power unit group 115. The 8 high-power units 112 cooperate with 2 filling wires 1131 with a wire diameter substantially the same as that of the high-power units 112 and are twisted around the low-power unit group 115 to form a twisted wire 11. At the same time, a protective layer 12 and a reinforcement layer 13 are sequentially arranged outside the twisted wire 11, and the reinforcement layer 13 is a double-layer arrangement.

[0043] Another aspect of the present application further provides a method for preparing the above-mentioned watertight cable, the method specifically comprising the following steps:

[0044] Pair twisting: small power units 111 are twisted in pairs and a filling unit 113 is provided to obtain a small power unit pair 114. All small power unit pairs 114 are twisted and a filling unit 113 is provided to obtain a small power unit group 115. An insulating layer is extruded outside the small power unit group 115.

[0045] Twisting: twisting the high power unit 112 outside the low power unit group 115 and setting the filling unit 113 to form the twisted wire 11;

[0046] Reinforcement: A protective layer 12 is disposed on the outside of the twisted wire 11 to form a core wire, and a reinforcement layer 13 is disposed on the outside of the core wire to obtain a watertight cable 100.

[0047] As an optional embodiment, the insulating layer uses at least one of a fluororesin insulating layer or a polyolefin insulating layer, and the protective layer 12 uses a thermoplastic elastomer material layer; a shielding layer is arranged on the inner side of the insulating layer, and a shielding layer is arranged on the inner side of the protective layer 12. In the insulating layer, the fluororesin has excellent high temperature resistance and voltage resistance, which can ensure that in the actual high current and high voltage use environment, the insulating layer will not be softened by heat and there will be no discharge between conductors. Thermoplastic elastomers have the characteristics of high wear resistance, high strength, and high toughness, which ensure that the watertight cable 100 will not cause sheath damage, water leakage, etc. due to various emergencies during operation. A shielding layer is arranged on the inner side of the insulating layer close to the insulating layer, and a shielding layer is arranged on the inner side of the protective layer 12 close to the protective layer 12, which can improve the anti-interference ability of the watertight cable 100 to external signals, prevent external signals from interfering with the signal transmission in the watertight cable 100, and improve the stability of signal transmission under extreme conditions.

[0048] 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 watertight cable, characterized in that: include: A twisted wire, the twisted wire comprising a low-power unit, a high-power unit and a filling unit, the high-power unit is twisted outside the low-power unit, and the filling unit is provided at least one place between adjacent low-power units, between adjacent high-power units, or between the low-power unit and the high-power unit; A protective layer, the protective layer covering the outside of the twisted wire; A reinforcing layer, the reinforcing layer being coated on the outer side of the protective layer; The watertight 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, and the breaking strength of the watertight cable is greater than or equal to 120kN.

2. The watertight cable according to claim 1, characterized in that: In the twisted wire, the low-power units are twisted in pairs to form a low-power unit pair, the low-power unit pairs are twisted together to form a low-power unit group, and the high-power unit is twisted and arranged outside the low-power unit group; The filling unit is arranged in the middle of the small power unit group.

3. The watertight cable according to claim 1, characterized in that: The reinforcement layer includes at least one of a steel wire layer or an aramid fiber layer.

4. The watertight cable according to claim 1, characterized in that: The reinforcing layer includes a first fiber layer and a second fiber layer. The first fiber layer is twisted on the outside of the 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 watertight cable according to claim 4, characterized in that: In the first fiber layer, the twist angle of the fibers is 8-15°.

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

7. The watertight 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 watertight 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.

9. The watertight cable according to claim 1, characterized in that: A shielding layer is also provided between the low-power unit and the high-power unit.

10. The watertight cable according to claim 1, characterized in that: The filling unit includes at least one of filling glue, filling resin or filling wire.

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