Waterproof flexible cable

Abstract

The utility model discloses a waterproof flexible cable, which comprises a cable core and an outer sheath wrapped on the outer layer of the cable core, the cable core comprises two types of wire cores, the wire cores comprise power wire cores and control wire cores, and conductors of the power wire cores and the control wire cores are flexible conductors; the outer sheath further comprises three waterproof layers, and two waterproof layers are arranged in each of the power wire cores and the control wire cores. The cable is reasonable in structural design, and has the following beneficial effects that the power wire cores and the control wire cores are arranged in the cable, and two cables with different purposes are combined together, so that the construction difficulty is reduced, the construction is convenient, one ground wire can be shared, and the cost is saved. And meanwhile, the conductors of the power wire cores and the control wire cores are flexible conductors, and the multiple waterproof layers are combined with the waterproof layer, so that the waterproof performance is excellent, and the flexibility and the waterproof performance of the cable are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a waterproof flexible cable. Background Art

[0002] With the wide application of electronic devices in various harsh environments, such as humid underground places, underwater facilities, and outdoor exposure to rain, etc., higher requirements are put forward for the waterproof performance of cables. Traditional cables are prone to faults such as short circuits and leakage in humid or water environments, affecting the normal operation of equipment and even possibly causing safety accidents.

[0003] Secondly, the demand for flexibility stems from the pursuit of wiring flexibility by modern devices. In some scenarios with limited space and frequent bending or movement, such as robot joints, wearable devices, aerospace fields, etc., rigid cables cannot meet the complex wiring requirements and are prone to damage or limit the movement range of the device.

[0004] To address this challenge, developing a new type of waterproof flexible cable has become an urgent task to meet the power and signal transmission requirements in these special environments. Content of the Utility Model

[0005] The purpose of the utility model is to provide a waterproof flexible cable to solve the problems of insufficient waterproof and flexible performance of cables in the prior art.

[0006] To achieve the above purpose, the technical solution of the utility model provides a waterproof flexible cable, including a cable core and an outer sheath wrapped around the outer layer of the cable core. The cable core includes two types of cores, and the core includes a power core and a control core. The conductors of the power core and the control core are both flexible conductors; the outer sheath further includes three waterproof layers, and two water-blocking layers are arranged in both the power core and the control core.

[0007] Further, the structure of the outer sheath from the inside to the outside is in turn a tape, a shielding layer, a first waterproof layer, a second waterproof layer, a third waterproof layer, and a sheath, with the outer layer wrapping the inner layer.

[0008] Further, the outer sheath further includes a drainage wire, and the drainage wire is arranged in the third waterproof layer.

[0009] Further, the structure of the power core from the inside to the outside is in turn a power core conductor, a first insulating layer, a first water-blocking layer of the power core, and a second water-blocking layer of the power core.

[0010] Further, the power core conductor is a Class 5 tinned soft copper conductor, which is stranded by multiple strands of tinned copper wires; the power core further includes a first stranded wire and water blocking powder or water blocking yarn. The first stranded wire and the Class 5 tinned soft copper conductor are stranded together to form the power core conductor, and water blocking powder or water blocking yarn is added during the stranding process. The first stranded wire is aramid fiber.

[0011] Further, the structure of the control core from inside to outside is successively the control core end, the first water blocking layer of the control core, and the second water blocking layer of the control core; the control core end includes a control core conductor and a second insulating layer, and the number of the control core ends is 4; a second filler is arranged at the gap between the control core ends in the control core.

[0012] Further, the control core conductor is a Class 5 tinned soft copper conductor, which is stranded by multiple strands of tinned copper wires; the control core further includes a second stranded wire and water blocking powder or water blocking yarn. The second stranded wire and the Class 5 tinned soft copper conductor are stranded together to form the control core conductor, and water blocking powder or water blocking yarn is added during the stranding process. The second stranded wire is aramid fiber.

[0013] Further, a first filler is arranged at the gap between the cores in the cable core; both the first filler and the second filler are water blocking ropes; both the first insulating layer and the second insulating layer are one layer of ethylene propylene rubber layer; both the first water blocking layer of the power core and the first water blocking layer of the control core are single-sided insulating water blocking tapes; both the second water blocking layer of the power core and the second water blocking layer of the control core are polyethylene sheath layers.

[0014] Further, the tape is a polyester tape, the shielding layer is a braided shielding layer, the braided shielding layer is braided by bare copper wires, and the braiding density ≥ 85%; the first waterproof layer is a double-sided water blocking tape, the second waterproof layer is one layer of longitudinally wrapped aluminum-plastic composite tape; the third waterproof layer is one layer of HDPE sheath; the sheath is a nylon 12 sheath.

[0015] Further, the number of the power cores is 3, the number of the control cores is 1, and the two types of cores are symmetrically arranged.

[0016] In summary, the device structure of the present utility model is reasonably designed. By using the technical solution of the present utility model, the following beneficial effects are achieved: The present utility model includes a power core and a control core, combining two cables with different uses together, reducing the construction difficulty and facilitating construction. At the same time, a common ground wire can be shared, saving costs. At the same time, the conductors of the power core and the control core are both flexible conductors; the outer sheath further includes three waterproof layers, and two water blocking layers are arranged inside both the power core and the control core. The combination of multiple waterproof layers and water blocking layers makes the waterproof performance excellent, ensuring the flexibility and water blocking performance of the cable. Brief Description of the Drawings

[0017] Figure 1 is a schematic cross-sectional structure diagram of the waterproof flexible cable of the present utility model;

[0018] Description of the reference numerals: 1 - power core conductor; 2 - first stranded wire; 3 - first insulating layer; 4 - first water-blocking layer of the power core; 5 - second water-blocking layer of the power core; 6 - first filler; 7 - tape; 8 - shielding layer; 9 - first waterproof layer; 10 - second waterproof layer; 11 - third waterproof layer; 12 - drain wire; 13 - sheath; 201 - control core conductor; 202 - second stranded wire; 203 - second insulating layer; 204 - second filler; 205 - first water-blocking layer of the control core; 206 - second water-blocking layer of the control core. Detailed Description of the Preferred Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model, but this does not constitute a limitation to the protection scope of the present utility model.

[0020] In the present utility model, for a clearer description, the following explanations are made: When an observer observes facing the attached Figure 1 drawing, the front left side of the observer is set as the front, the rear right side of the observer is set as the rear, the rear left side of the observer is set as the left, the front right side of the observer is set as the right, the upper side of the observer is set as the upper, and the lower side of the observer is set as the lower. It should be noted that the terms "front end", "rear end", "left side", "right side", "middle part", "upper side", "lower side", etc. in the text indicate the orientation or position relationship based on the orientation or position relationship set by the attached drawing, and are only for the purpose of clearly describing the present utility model, rather than indicating or implying that the structures or components referred to must have a specific orientation and be constructed in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clear or simplified description, and cannot be understood as indicating or implying relative importance or quantity.

[0021] Refer to Figure 1 , the present utility model provides a waterproof flexible cable, including a cable core and an outer sheath wrapped around the outer layer of the cable core. The cable core includes two types of cores, and the cores include a power core and a control core. The conductors of the power core and the control core are both flexible conductors; the outer sheath further includes three waterproof layers, and two water-blocking layers are provided inside both the power core and the control core.

[0022] The present utility model combines the power core and the control core into one, combines two cables with different uses together, reduces the construction difficulty and facilitates construction. At the same time, a common ground wire can be shared, saving costs.

[0023] At the same time, the combination of multiple layers of waterproof layer and water-blocking layer makes the waterproof performance excellent, ensuring the flexibility and water-blocking performance of the cable.

[0024] Specifically, the structure of the outer sheath is, from inside to outside, a wrapping tape 7, a shielding layer 8, a first waterproof layer 9, a second waterproof layer 10, a third waterproof layer 11, and a sheath 13, with the outer layer wrapping the inner layer; specifically, the outer sheath also includes a drainage line 12, which is arranged in the third waterproof layer 11.

[0025] A drainage line 12 is provided in the third waterproof layer 11. The drainage line 12 can monitor the water vapor in the cable and perform an intelligent early warning function. When there is too much water vapor, an alarm will be sounded, and the operation of the cable will be monitored when the cable is working normally.

[0026] Specifically, the structure of the power core comprises, from inside to outside, a power core conductor 1 , a first insulating layer 3 , a first power core water-blocking layer 4 , and a second power core water-blocking layer 5 .

[0027] As a preferred embodiment of the present invention, the power line core conductor 1 is a Class 5 tinned soft copper conductor, which is twisted together by multiple strands of tinned copper wires; the power line core also includes a first twisted wire 2 and water-blocking powder or water-blocking yarn. The first twisted wire 2 is twisted together with the Class 5 tinned soft copper conductor to form the power line core conductor 1. Water-blocking powder or water-blocking yarn is added during the twisting process. The first twisted wire 2 is aramid wire.

[0028] As a preferred embodiment of the present invention, the control core conductor 201 is a Class 5 tinned soft copper conductor, which is twisted together by multiple strands of tinned copper wires; the control core also includes a second twisted wire 202 and water-blocking powder or water-blocking yarn. The second twisted wire 202 is twisted together with the Class 5 tinned soft copper conductor to form the control core conductor 201. Water-blocking powder or water-blocking yarn is added during the twisting process. The second twisted wire 202 is aramid wire.

[0029] The power line core conductor 1 and the control line core conductor 201 are both made of Class 5 twisted tinned soft copper conductors, which are twisted by multiple strands of tinned copper wires and have good bending properties. Tinned copper conductors have good electrical conductivity; the surface coating of tinned copper conductors can prevent copper oxidation, improve its corrosion resistance, have good mechanical properties, and can withstand various physical shocks and wear. The use of multiple strands of fine copper wires bundled and twisted in the same direction greatly improves the softness of the cable, has good flexibility and bending resistance, and will not break even if subjected to frequent long-term bending. At the same time, adding aramid wires to bundle and twist further enhances the toughness of the cable, and significantly increases its resistance to tensile breakage. Water-blocking powder and water-blocking yarn are added during the monofilament twisting process. When water enters the conductor, the water-blocking powder or water-blocking yarn swells when it encounters water, preventing water from penetrating and playing the role of radial water blocking for the conductor.

[0030] The first stranded wire 2 and the second stranded wire 202 are both aramid filaments, which are stranded together with the conductor filaments inside the conductor. Adding aramid filaments for stranding further enhances the toughness of the cable, and significantly increases the anti-breaking ability.

[0031] As a preferred embodiment of the present utility model, the structure of the control core from the inside to the outside is successively the control core end, the first water-blocking layer 205 of the control core, and the second water-blocking layer 206 of the control core; the control core end includes the control core conductor 201 and the second insulating layer 203, and the number of the control core ends is 4; a second filler 204 is arranged at the gap between the control core ends in the control core.

[0032] Specifically, a first filler 6 is arranged at the gap between the cores in the cable core; both the first filler 6 and the second filler 204 are water-blocking ropes; both the first insulating layer 3 and the second insulating layer 203 are one layer of ethylene-propylene rubber layer; the first water-blocking layer 4 of the power core and the first water-blocking layer 205 of the control core are both single-sided insulating water-blocking tapes; the second water-blocking layer 5 of the power core and the second water-blocking layer 206 of the control core are both 13 layers of polyethylene sheaths.

[0033] Both the first filler 6 and the second filler 204 are water-blocking ropes. Using water-blocking ropes for filling is characterized by strong water absorption and high expansion rate. It can strongly absorb water and rapidly expand to form a gel-like substance to block the water seepage channel, thereby ensuring the insulation safety of the cable. In addition, the water-blocking rope is light in weight and clean, which is convenient for laying and connection, and is more environmentally friendly.

[0034] Both the first insulating layer 3 and the second insulating layer 203 are extruded one layer of ethylene-propylene rubber. This ethylene-propylene rubber layer has excellent insulation performance (volume resistivity at 20°C ≥ 1.0 * 10^15 Ω·cm) and resistance to oxidation, ozone, heat, oil, natural aging, and flame retardancy. It can meet the long-term operation of the cable conductor at an allowable working temperature of 90°C, and the short-circuit temperature of the core does not exceed 250°C (duration does not exceed 5 s). Its electrical insulation performance and bending radius far exceed those of cross-linked polyethylene materials. The most important thing is that it has the excellent insulation performance of no "water tree" problem.

[0035] Both the first water-blocking layer 4 of the power core and the first water-blocking layer 205 of the control core are single-sided insulating water-blocking tapes. Using water-blocking tapes has the characteristics of high expansion pressure, fast expansion speed, good gel stability, and good thermal stability, which can prevent the longitudinal spread of water and moisture, thereby playing a water-blocking role.

[0036] Both the second water-blocking layer 5 of the power core and the second water-blocking layer 206 of the control core are polyethylene sheath layers. Extruding a layer of polyethylene sheath material as an insulating water-blocking protective layer, polyethylene has excellent electrical performance, good mechanical strength, wear resistance, good heat aging performance, low temperature resistance, chemical resistance, and excellent water tightness.

[0037] Specifically, the wrapping tape 7 is a polyester tape, the shielding layer 8 is a braided shielding layer, which is braided by bare copper wires, and the braiding density is ≥85%; the first waterproof layer 9 is a double-sided water-blocking tape, and the second waterproof layer 10 is a longitudinally wrapped aluminum-plastic composite tape; the third waterproof layer 11 is a layer of HDPE sheath; the sheath 13 is a nylon 12 sheath.

[0038] The wrapping tape 7 is a polyester tape with good insulation performance, which can effectively protect the shielding layer 8 from damage.

[0039] The shielding layer 8 is a braided shielding layer. The outside of the polyester tape is braided and shielded with bare copper wires, and the braiding density is ≥85%. It is mainly used to prevent electrostatic interference, electromagnetic induction, crosstalk induction and interference generated by other signal lines in the energy storage system, and ensure the normal operation of system transmission.

[0040] The first waterproof layer 9 uses a double-sided water-blocking tape, which has the characteristics of high expansion pressure, fast expansion speed, good gel stability and good thermal stability, and can prevent the longitudinal spread of water and moisture, thus playing a water-blocking role.

[0041] The second waterproof layer 10 is a longitudinally wrapped aluminum-plastic composite tape. The joint of the aluminum-plastic composite tape is adhesively bonded with hot melt adhesive. The joint of the aluminum-plastic composite tape is completely bonded and sealed, and water is almost impossible to penetrate. Its water tightness is hundreds or even thousands of times higher than that of single polyethylene.

[0042] The third waterproof layer 11 is a layer of extruded HDPE sheath. Polyethylene has excellent electrical properties, good mechanical strength, wear resistance, heat aging resistance, low temperature resistance, chemical resistance, and is adhesively bonded to the upper aluminum-plastic composite tape. The complete bonding and sealing of the two further improves the water tightness of the cable.

[0043] The sheath 13 is an extruded nylon 12 sheath, which makes the cable have good oil resistance, wear resistance, fire resistance, cold resistance, high temperature resistance, and anti-rat and ant properties.

[0044] Specifically, the number of power cores is 3, the number of control cores is 1, and the two types of cores are symmetrically arranged.

[0045] The utility model adopts multi-strand fine copper wires to be twisted in the same direction and then re-twisted, which greatly improves the flexibility of the cable. It has good flexibility and bending resistance. Even when subjected to frequent long-term bending, there will be no phenomenon of broken cores. At the same time, aramid fibers are added for twisting together, further enhancing the toughness of the cable and significantly increasing the tensile breaking ability. And water blocking powder and water blocking yarn are added during the single-strand twisting process. When the conductor gets water, the water blocking powder or water blocking yarn swells when encountering water, preventing water from penetrating and playing a role in radially blocking water for the conductor. Moreover, each wire core and the cable core are produced with a water blocking structure. When the sheath 13 is damaged and water enters, the water blocking tape will swell when encountering water. After the water blocking tape swells, a water blocking section will be quickly formed to prevent further penetration of water. Then, a double-sided water blocking tape is overlapped and wrapped around the outside of the shielding layer 8, and an aluminum-plastic composite tape is longitudinally wrapped, and a polyethylene reinforcing layer is extruded. The joint of the aluminum-plastic composite tape is adhered with hot melt adhesive. The joint of the aluminum-plastic composite tape is completely bonded and sealed and adhered to the polyethylene reinforcing layer together, and it is almost impossible for water to penetrate through. Its water tightness is hundreds or even thousands of times higher than that of single polyethylene. At the same time, a drainage wire 12 is arranged on the outer layer of the reinforcing layer. This drainage wire 12 can monitor the water and gas in the cable to perform an intelligent early warning function. It will alarm when there is a lot of water and gas, and monitor the operation of the cable when the cable is working normally. At the same time, two types of cables with different uses, namely power cores and control cores, are combined together, using the same raw materials and sharing the same water blocking structure, ensuring the flexibility and water blocking performance of the cable, reducing the construction difficulty, facilitating construction, and at the same time, a common ground wire can be shared, further saving costs.

[0046] The specific features of the utility model are as follows:

[0047] 1. Enhancing the stability and reliability of equipment operation: In humid or underwater environments, it can effectively avoid faults such as short circuits and electric leakage caused by cable water ingress, ensure the continuous and stable operation of equipment, and reduce production interruptions and equipment damage caused by cable problems.

[0048] 3. Improving safety: Reducing electrical accidents caused by cable water ingress, ensuring the safety of personnel's lives and property, especially in some places with extremely high safety requirements, such as chemical plants and mines.

[0049] 4. Extending the service life of equipment: Good waterproof performance can reduce the corrosion and damage of the cable, thereby extending the service life of the cable itself and the equipment connected to it, and reducing maintenance costs.

[0050] 5. Improving the flexibility of wiring: The flexible characteristics enable the cable to adapt to complex wiring environments, facilitating installation and use in narrow spaces or parts that require frequent bending, and improving the design freedom of equipment.

[0051] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present utility model.

Claims

1. A waterproof flexible cable comprising a cable core and an outer sheath wrapped around the outer layer of the cable core, characterized in that: The cable core includes two types of cores, the cores include power cores and control cores, and the conductors of the power cores and control cores are both flexible conductors; the outer sheath further includes three waterproof layers, and two waterproof layers are provided in both the power cores and control cores.

2. The waterproof flexible cable according to claim 1, wherein: The structure of the outer sheath from the inside to the outside is in turn a tape, a shielding layer, a first waterproof layer, a second waterproof layer, a third waterproof layer, and a sheath, with the outer layer wrapping the inner layer.

3. The waterproof flexible cable according to claim 2, wherein: The outer sheath further includes a drainage wire, and the drainage wire is arranged in the third waterproof layer.

4. A waterproof flexible cable according to any one of claims 1-3, characterized in that: The structure of the power core from the inside to the outside is in turn a power core conductor, a first insulating layer, a first water-blocking layer of the power core, and a second water-blocking layer of the power core.

5. The waterproof flexible cable according to claim 4, wherein: The power core conductor is a Class 5 tinned soft copper conductor, which is stranded by multiple strands of tinned copper wires; the power core further includes a first stranded wire and water-blocking powder or water-blocking yarn. The first stranded wire and the Class 5 tinned soft copper conductor are stranded together to form the power core conductor, and water-blocking powder or water-blocking yarn is added during the stranding process. The first stranded wire is aramid fiber.

6. The waterproof flexible cable according to claim 5, characterized in that: The structure of the control core from the inside to the outside is in turn a control core end, a first water-blocking layer of the control core, and a second water-blocking layer of the control core; the control core end includes a control core conductor and a second insulating layer, and the number of the control core ends is 4; a second filler is arranged at the gap between the control core ends in the control core.

7. The waterproof flexible cable according to claim 6, wherein: The control core conductor is a Class 5 tinned soft copper conductor, which is stranded by multiple strands of tinned copper wires; the control core further includes a second stranded wire and water-blocking powder or water-blocking yarn. The second stranded wire and the Class 5 tinned soft copper conductor are stranded together to form the control core conductor, and water-blocking powder or water-blocking yarn is added during the stranding process. The second stranded wire is aramid fiber.

8. A waterproof flexible cable according to claim 6 or 7, characterized in that: A first filler is arranged at the gap between the cores in the cable core; both the first filler and the second filler are water-blocking ropes; both the first insulating layer and the second insulating layer are one layer of ethylene propylene rubber layer; both the first water-blocking layer of the power core and the first water-blocking layer of the control core are single-sided insulating water-blocking tapes; both the second water-blocking layer of the power core and the second water-blocking layer of the control core are polyethylene sheath layers.

9. The waterproof flexible cable according to claim 2 or 3, characterized in that: The tape is a polyester tape, the shielding layer is a braided shielding layer, the braided shielding layer is braided by bare copper wires, and the braiding density ≥ 85%; the first waterproof layer is a double-sided water-blocking tape, the second waterproof layer is a layer of longitudinally wrapped aluminum-plastic composite tape; the third waterproof layer is a layer of HDPE sheath; the sheath is a nylon 12 sheath.

10. A waterproof flexible cable according to claim 1 or 2 or 5 or 6 or 7, characterized in that: The number of the power cores is 3, the number of the control cores is 1, and the two types of cores are symmetrically arranged.

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