High safety high voltage cable

Abstract

The application relates to a high-safety high-voltage cable applied to the technical field of cable-related technologies. When local damage occurs, water seeps at the damage point during use of the cable, which causes the corresponding cavity inside to generate gas. On one hand, the inner floating bag is inflated, gradually becomes larger, and effectively compensates for the problem of the decrease in buoyancy caused by water seepage due to the breakage; on the other hand, the gas in the cavity instantaneously increases, generates pressure on the floating block from the inside to the outside, and then makes the floating block rapidly crack. At this time, the enlarged inner floating bag leaks out, can provide buoyancy for the damage point again, is separated from the floating block, and is obviously changed in vision, so that the warning effect can be effectively ensured. Whether the cable is on the water surface or leaves the water surface after the work is completed, the obvious damage warning effect can be presented.

Description

A high-safety high-voltage cable Technical Field

[0001] This invention relates to a high-safety high-voltage cable, and more particularly to a high-safety high-voltage cable applied in the field of cable-related technologies. Background Technology

[0002] Cables include power cables, control cables, compensating cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, floating cables, etc. They are all made of several or several groups of conductors (each group has at least two conductors) twisted together to form a rope-like conductor. Each group of conductors is insulated from each other and is often twisted around a central core. The entire structure is covered with a highly insulating outer layer, and has the characteristics of being internally energized and externally insulated.

[0003] Floating cable technology is an innovative cable laying method that utilizes buoyancy to suspend cables on the water surface, eliminating the need for large vessels and enabling rapid cable deployment and maintenance. This technology has significant application value in the field of submarine cable laying, saving considerable time and manpower. For example, Chinese patent CN201820812211.9 discloses a novel floating cable. In this patent, the floating cable uses a sealed cavity to increase buoyancy, allowing the cable to float on the water surface, facilitating the safe operation of underwater robots. However, due to the multifaceted and uncertain nature of the aquatic environment, damage points are prone to occur, causing parts of the cable to sink and making it difficult to continue floating on the water surface. In severe cases, water may even seep into the cable, affecting the safe operation of underwater robots.

[0004] To address the aforementioned issues, Chinese Patent Specification No. CN117936167B discloses a floating cable specifically designed for underwater robots. When damage occurs, water seeps into the cavity, acting as a conductor to activate the display unit and illuminate the LED lights, thus providing a damage warning.

[0005] However, the above-mentioned solutions have the following drawbacks. First, relying on water as a conductor to turn on the LEDs can cause abnormal heating at the connection point, which can even burn out the circuit of the display unit in severe cases. This makes the stability of the LEDs lit for early warning poor, and the stable lighting time is short, resulting in limited warning effect. In addition, floating LEDs generally work on the water surface, and under the sunlight during the day, the light is relatively weak and difficult to detect. Furthermore, when damage occurs, it is difficult to detect the damage point when the operation is stopped. Summary of the Invention

[0006] The technical problem that this invention aims to solve in view of the above-mentioned prior art is that the warning effect of existing floating cables when they are damaged is relatively poor.

[0007] To address the aforementioned problems, this invention provides a high-safety high-voltage cable, comprising a cable body, an outer sheath fixedly wrapped around the outer end of the cable body, two buoyancy bars fixedly connected to the outer end of the outer sheath, each buoyancy bar comprising multiple buoyancy blocks and multiple isolation plates located between adjacent buoyancy blocks, the isolation plates being fixedly connected to the outer sheath, and the buoyancy blocks engaging with the isolation plates on both sides, and the buoyancy blocks being tightly attached to the outer sheath, the buoyancy blocks having cavities carved inside, the cavities containing inner floats, and the cavities being filled with effervescent tablet particles, the inner wall of the cavity facing the cable body having pre-separation grooves carved, the end of the inner float being fixedly connected to a positioning plate, the positioning plate being fixedly connected to the inner wall of the cavity, and the positioning plate dividing the cavity into two inflation chambers and an inflation chamber, the effervescent tablet particles being located in the inflation chamber, the opening of the inner float being located in the inflation chamber, the positioning plate having multiple evenly distributed air holes carved, the air holes connecting the air chambers and the inflation chamber, and the inner diameter of the air holes being smaller than the particle size of the effervescent tablet particles.

[0008] In the aforementioned high-safety high-voltage cable, the buoyancy block and its internal float are designed so that when a localized break occurs while the cable is operating on the water surface, water seepage at the break point will cause air to be generated inside the cavity, inflating the internal float and gradually increasing its size. This effectively compensates for the decrease in buoyancy caused by the break and water seepage. At the same time, the air generation will cause the buoyancy block to break rapidly, causing the internal float to leak out. This will restore buoyancy to the break point and separate it from the buoyancy block, creating a clear visual change and effectively ensuring the warning effect.

[0009] As a further improvement of this application, the positioning plate is made of water-soluble material and a connecting rope is encapsulated inside the positioning plate. One end of the connecting rope is fixedly connected to the inner wall of the cavity near the outer sheath, and the other end of the connecting rope is tied to the opening of the inner float.

[0010] As a further improvement of this application, the internal float includes a reflective bladder, a flared air tube fixedly connected to the end of the reflective bladder near the positioning plate, and a neck ring fixedly connected to the neck of the flared air tube. The connection point between the connecting rope and the internal float is located at the neck ring, and a one-way valve is installed inside the flared air tube.

[0011] As a further improvement of this application, the connecting rope is made of a corrosion-resistant flexible material and the length of the connecting rope is not less than twice the maximum width of the buoyancy block. The reflective bladder is made of an elastic sealing material and the space occupied by the effervescent tablet particles and the reflective bladder in the air chamber does not exceed 2 / 3 of the air chamber.

[0012] As a further improvement of this application, the lateral span of the pre-separation groove is not less than 2 / 3 of the lateral span of the cavity, the pre-separation groove is U-shaped, and the bend of the U-shape is located on the side of the air-raising cavity away from the air-filling cavity. The cross-section of the pre-separation groove is an acute triangle, and the height of the acute triangle is not greater than 1 / 2 of the thickness of the corresponding part of the buoyancy block.

[0013] As another improvement of this application, the buoyancy block includes a positioning layer that snaps into two spacers, a compression layer that is fixedly connected to the end of the positioning layer away from the outer sheath, and a pre-convex layer that is fixedly connected to the outer end of the compression layer. The pre-convex layer abuts against the spacers on both sides.

[0014] As a further improvement to this application, the compression layer faces the center of the cavity and is in a stacked and compressed state. The stacked parts of the compression layer are coated with a water-soluble layer, and the outer surface of the compression layer is wrapped with a corrosion-resistant elastic waterproof layer. The inner surface of the inner wall of the compression layer is exposed at the corresponding part of the cavity.

[0015] As a further improvement to this application, the end face of the pre-convex layer corresponding to the separator is coated with a reflective layer, and the reflective layer is a high-brightness color.

[0016] In summary, in the aforementioned high-safety high-voltage cable, the buoyancy block and its internal float ensure that when a localized break occurs, water will seep into the break point during use. This will cause gas to be generated inside the corresponding cavity. On one hand, the internal float can be inflated, gradually increasing its size and effectively compensating for the decrease in buoyancy caused by the break and water seepage. On the other hand, the instantaneous increase in gas inside the cavity can exert pressure on the buoyancy block from the inside out, causing the buoyancy block to crack rapidly. At this time, the enlarged internal float leaks out, which can not only restore buoyancy to the break point, but also separate from the buoyancy block, resulting in a clear visual change and effectively ensuring a warning effect. Whether the cable is on the water surface or after the operation is completed and the cable leaves the water, it can present a clear damage warning effect. Attached Figure Description

[0017] Figure 1 is a radial cross-sectional view of the first embodiment of this application;

[0018] Figure 2 is a schematic diagram of the horizontal portion of the first embodiment of this application;

[0019] Figure 3 is a cross-sectional schematic diagram of the first embodiment of this application;

[0020] Figure 4 is a cross-sectional schematic diagram of the buoyancy block portion in the first embodiment of this application;

[0021] Figure 5 is a schematic diagram of the buoyancy cavity in the first embodiment of this application;

[0022] Figure 6 is a schematic diagram of the buoyancy block when local damage and water seepage occur in the first embodiment of this application;

[0023] Figure 7 is a schematic diagram of the internal floatation bladder separating from the buoyancy block in the first embodiment of this application;

[0024] Figure 8 is a schematic diagram showing the changes of the internal float in the first embodiment of this application before and after inflation.

[0025] Figure 9 is a schematic diagram of the cable as a whole after the inner float is separated from the buoyancy block according to the first embodiment of this application;

[0026] Figure 10 is a top view of the buoyancy block according to the second embodiment of this application;

[0027] Figure 11 is a schematic diagram showing the changes in the buoyancy block after partial damage and water seepage in the second embodiment of this application.

[0028] Explanation of the labels in the diagram:

[0029] 1. Cable body, 2. Outer sheath, 3. Buoyancy block, 301. Cavity, 302. Pre-separation groove, 31. Positioning layer, 32. Compression layer, 33. Pre-convex layer, 4. Isolation plate, 5. Inner float, 51. Reflective bladder, 52. Flared air tube, 53. Neck ring, 54. Connecting rope, 6. Positioning plate. Detailed Implementation

[0030] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0031] First implementation method:

[0032] Figure 1-2 shows a high-safety high-voltage cable, including a cable body 1. The outer end of the cable body 1 is fixedly wrapped with an outer sheath 2. Two buoyancy bars are fixedly connected to the outer end of the outer sheath 2. The buoyancy bars include multiple buoyancy blocks 3 and multiple isolation plates 4 located between two adjacent buoyancy blocks 3. The isolation plates 4 are fixedly connected to the outer sheath 2, and the buoyancy blocks 3 are respectively engaged with the isolation plates 4 on both sides. The buoyancy blocks 3 are tightly attached to the outer sheath 2, so that the buoyancy blocks 3 can be disassembled as a whole. In case of accidental damage, only partial replacement is required, without the need for complete replacement, effectively reducing maintenance costs.

[0033] As shown in Figures 3-4, a cavity 301 is carved inside the buoyancy block 3. An inner float 5 is installed inside the cavity 301, which is also filled with effervescent tablet particles. As shown in Figure 5, a pre-separation groove 302 is carved into the inner wall of the cavity 301 facing outwards from the cable body 1. A positioning plate 6 is fixedly connected to the end of the inner float 5. The positioning plate 6 is fixedly connected to the inner wall of the cavity 301, and the positioning plate 6 divides the cavity 301 into two inflation chambers and an air-raising chamber. The effervescent tablet particles are located in the air-raising chamber, and the opening of the inner float 5 is located in the inflation chamber. The positioning plate 6 has multiple evenly distributed air holes that connect the air chamber and the air-raising chamber. The positioning plate 6 is made of a water-soluble material. When intact, it can bind the inner float 5, keeping the opening of the inner float 5 separated from the effervescent tablet particles. When broken, it is water-soluble, allowing the inner float 5 to be released and easily separated from the buoyancy block 3. The positioning plate 6 also contains a connecting rope 54. One end of the connecting rope 54 is fixedly connected to the inner wall of the cavity 301 near the outer sheath 2, and the other end of the connecting rope 54 is tied to the opening of the inner float 5. When a break occurs, water enters the corresponding cavity 301 along the break point and reacts with the effervescent tablet particles inside, instantly generating a large amount of gas. Some of the gas remains in the cavity 301, while some passes through the positioning plate 6 and enters the inner float 5 through its opening, causing the inner float 5 to enlarge, as shown in Figure 6. As the amount of water seepage gradually increases, more and more gas is released from the cavity 301, generating pressure from the inside out. This causes the depth of the pre-separation tank 302 to gradually increase, as shown in Figure 7, until the buoyancy block 3 is torn along the cavity 301. At this point, the inner float 5 is completely exposed, allowing the positioning plate 6 to fully contact the water and gradually dissolve, releasing the connecting rope 54 sealed inside. The inner float 5 becomes free and, under the action of water buoyancy, gradually separates from the buoyancy block 3, making the difference between the buoyancy block 3 before and after the break obvious. This provides a clear and continuous warning to the staff. Compared to the existing technology that uses water as a conductor, resulting in unstable abnormal displays, this method effectively ensures the warning effect, allowing staff to detect and handle the situation in a timely manner.

[0034] Furthermore, the inner diameter of the pores is smaller than the particle size of the effervescent tablets, making it difficult for the effervescent tablets to enter the inflation chamber. This effectively protects the opening of the inner float 5 from blockage by the effervescent tablets, ensuring that in the event of water leakage, some of the gas generated by the effervescent tablets in contact with water can be smoothly injected into the inner float 5, allowing it to expand rapidly. This compensates for the buoyancy loss at the damaged area, effectively protecting the cable body 1 and preventing it from sinking partially underwater. This, in turn, ensures the safe and stable operation of the underwater robot.

[0035] As shown in Figure 8, the inner float 5 includes a reflective bladder 51, a flared air tube 52 fixedly connected to the end of the reflective bladder 51 near the positioning plate 6, and a neck ring 53 fixedly connected to the neck of the flared air tube 52. In its natural state, the reflective bladder 51 is saturated with air. The connection point between the connecting rope 54 and the inner float 5 is located at the neck ring 53. A one-way valve is installed in the flared air tube 52, which allows the inner float 5 to be inflated from the outside to the inside, and the gas inside is not easy to overflow, thereby effectively ensuring its buoyancy in the water.

[0036] The connecting rope 54 is made of a corrosion-resistant flexible material, and the length of the connecting rope 54 is not less than twice the maximum width of the buoyancy block 3. The reflective bladder 51 is made of an elastic sealing material. The space occupied by the effervescent tablet particles and the reflective bladder 51 in the air chamber does not exceed 2 / 3 of the air chamber, so that the inner float bladder 5 has a certain expansion space after being inflated.

[0037] The lateral span of the pre-separation groove 302 is not less than 2 / 3 of the lateral span of the cavity 301, so that in the event of accidental damage, when subjected to gas pressure from the inside out, the space of the pre-separation groove 302 after being expanded is large enough to facilitate the separation of the inner float 5 from the buoyancy block 3. The pre-separation groove 302 is U-shaped, and the bend of the U-shape is located on the side of the air chamber away from the air chamber. The cross-section of the pre-separation groove 302 is an acute triangle, and the height of the acute triangle is not greater than 1 / 2 of the thickness of the corresponding part of the buoyancy block 3, so that when subjected to force from the inside out, the pre-separation groove 302 is easily torn, and the situation where the inner float 5 is difficult to separate from the buoyancy block 3 is less likely to occur.

[0038] In summary, in the aforementioned high-safety high-voltage cable, through the buoyancy block 3 and its internal float 5, when a localized damage occurs, water will seep into the damaged area during use. This will cause gas to be generated inside the corresponding cavity 301. On the one hand, the internal float 5 can be inflated, gradually increasing its size and effectively compensating for the decrease in buoyancy caused by the rupture and water seepage. On the other hand, the instantaneous increase in gas inside the cavity 301 can exert pressure on the buoyancy block 3 from the inside out, causing the buoyancy block 3 to crack rapidly. At this time, the enlarged internal float 5 leaks out, which can not only provide buoyancy to the damaged area again, but also separate from the buoyancy block 3, resulting in a clear visual change and effectively ensuring the warning effect. Whether on the water surface or after the operation is completed and the cable leaves the water, a clear damage warning effect can be presented.

[0039] Second implementation method:

[0040] This embodiment further improves the buoyancy block 3 based on the first embodiment, while the rest remains the same as the first embodiment.

[0041] Figure 10 shows that the buoyancy block 3 includes a positioning layer 31 that snaps into two isolation plates 4, a compression layer 32 fixedly connected to the end of the positioning layer 31 away from the outer sheath 2, and a pre-convex layer 33 fixedly connected to the outer end of the compression layer 32. The pre-convex layer 33 abuts against the isolation plates 4 on both sides. The compression layer 32 faces the center of the cavity 301 and is in a stacked and compressed state. The stacked part of the compression layer 32 is coated with a water-soluble layer, and the outer surface of the compression layer 32 is wrapped with a corrosion-resistant elastic waterproof layer. The inner surface of the inner wall of the compression layer 32 is flush with the cavity 301. When the corresponding area is exposed, water enters the cavity 301 when local damage occurs. Part of the water reacts with the effervescent tablet particles, and part of the water comes into contact with the water-soluble layer on the inner wall of the compression layer 32, causing the water-soluble layer to dissolve. As the amount of gas increases, the stacked compression layer 32 will be stretched open, causing the pre-convex layer 33 to gradually move away from the positioning layer 31, thus being squeezed out from between the two isolation plates 4. As the amount of gas further increases, the buoyancy block 3 will continue to be torn and separated from the inner float 5 as in the first embodiment.

[0042] The end faces of the pre-convex layer 33 and the isolation plate 4 are coated with a reflective layer, and the reflective layer is a high-brightness color. When the compression layer 32 expands and the misaligned part of the pre-convex layer 33 and the isolation plate 4 is exposed, the reflective layer at the end can improve the warning level of the abnormality at the buoyancy block 3, making the reminder effect better.

[0043] In this embodiment, if the gas generated by the reaction between the water seeping into the cavity 301 and the effervescent tablet fails to tear the pre-separation tank 302, but most of the gas still accumulates in the cavity 301, the buoyancy block 3 can be stretched open and protrude outward. Even if the inner float 5 does not separate from the buoyancy block 3, it can still play a role in compensating for buoyancy, making it difficult for the working cable to sink to the bottom of the water. At the same time, the outward protrusion of the buoyancy block 3 can also make it significantly different from the other buoyancy blocks 3 when it leaves the water surface after operation. Compared with the first embodiment, this embodiment has a better effect in preventing damage. In specific implementation, an appropriate method can be selected according to actual needs.

[0044] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A high-safety high-voltage cable, characterized in that: The cable includes a cable body (1), the outer end of which is fixedly wrapped with an outer sheath (2). Two buoyancy bars are fixedly connected to the outer end of the outer sheath (2). Each buoyancy bar includes multiple buoyancy blocks (3) and multiple isolation plates (4) located between adjacent buoyancy blocks (3). The isolation plates (4) are fixedly connected to the outer sheath (2), and the buoyancy blocks (3) are interlocked with the isolation plates (4) on both sides. The buoyancy blocks (3) are tightly attached to the outer sheath (2). A cavity (301) is carved inside each buoyancy block (3). An inner float (5) is provided inside the cavity (301), and the cavity (301) is also filled with effervescent tablet particles. A pre-separation groove (302) is carved into the inner wall of the cavity (301) facing the outside of the cable body (1). A positioning plate (6) is fixedly connected to the end of the inner float (5). The positioning plate (6) is fixedly connected to the inner wall of the cavity (301), and the positioning plate (6) divides the cavity (301) into two air-filling chambers and an air-raising chamber. The effervescent tablet particles are located in the air-raising chamber, and the opening of the inner float (5) is located in the air-filling chamber. The positioning plate (6) Multiple evenly distributed air holes are drilled on the top, the air holes connect the air cavity and the air-generating cavity, and the inner diameter of the air holes is smaller than the particle size of the effervescent tablet; the positioning plate (6) is made of water-soluble material, and a connecting rope (54) is encapsulated inside the positioning plate (6). One end of the connecting rope (54) is fixedly connected to the inner wall of the cavity (301) near the outer sheath (2), and the other end of the connecting rope (54) is tied to the mouth of the inner float (5); the inner float (5) includes a reflective bladder (51) and a flared air tube fixedly connected to the end of the reflective bladder (51) near the positioning plate (6). (52), and a neck ring (53) fixedly connected to the neck of the flared trachea (52), the connection point of the connecting rope (54) and the inner float (5) is located at the neck ring (53), and a one-way valve is installed inside the flared trachea (52); the buoyancy block (3) includes a positioning layer (31) that is snapped into two isolation plates (4), a compression layer (32) fixedly connected to the end of the positioning layer (31) away from the outer sheath (2), and a pre-convex layer (33) fixedly connected to the outer end of the compression layer (32), the pre-convex layer (33) abutting against the isolation plates (4) on both sides.

2. The high-safety high-voltage cable according to claim 1, characterized in that: The connecting rope (54) is made of a corrosion-resistant flexible material, and the length of the connecting rope (54) is not less than twice the maximum width of the buoyancy block (3). The reflective bladder (51) is made of an elastic sealing material. The space occupied by the effervescent tablet particles and the reflective bladder (51) in the air chamber does not exceed 2 / 3 of the air chamber.

3. A high-safety high-voltage cable according to claim 2, characterized in that: The transverse span of the pre-separation groove (302) is not less than 2 / 3 of the transverse span of the cavity (301). The pre-separation groove (302) is U-shaped, and the bend of the U-shape is located on the side of the air-raising cavity away from the air-filling cavity. The cross section of the pre-separation groove (302) is an acute triangle, and the height of the acute triangle is not greater than 1 / 2 of the thickness of the corresponding part of the buoyancy block (3).

4. The high-safety high-voltage cable according to claim 1, characterized in that: The compression layer (32) is directly opposite the center of the cavity (301), and the compression layer (32) is in a stacked and compressed state. The stacked part of the compression layer (32) is coated with a water-soluble layer, and the outer surface of the compression layer (32) is wrapped with a corrosion-resistant elastic waterproof layer. The inner surface of the inner wall of the compression layer (32) is exposed at the corresponding part of the cavity (301).

5. A high-safety high-voltage cable according to claim 4, characterized in that: The pre-convex layer (33) and the end face corresponding to the isolation sheet (4) are coated with a reflective layer, and the reflective layer is a high-brightness color.

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