Waterproof and moisture-proof power cable

Abstract

The application relates to the technical field of power cables, and discloses a water-resisting and damp-proof power cable, which comprises a cable core and a positioning frame wrapped outside the cable core, the outer side of the positioning frame is wrapped with a protective layer, and the outer side of the protective layer is wrapped with an insulating sleeve; the saturated vapor pressure of water can be accelerated to accelerate the conversion of liquid water into gas, so that the water on the end surface is quickly changed into water vapor and discharged, long-time adhesion and accumulation of water is avoided, the water gradually permeates into the cable, the dryness inside the cable is ensured, a self-adaptive matching effect with the amount of water can be formed, local accumulation of water can be effectively avoided, the water-resisting and damp-proof performance is obviously improved through the guiding treatment of the excess water, and the water-resisting and damp-proof effect of the cable under complex working conditions is ensured.

Description

Technical Field

[0001] This invention relates to the field of power cable technology, and in particular to a water-blocking and moisture-proof power cable. Background Technology

[0002] Cables, as the core carriers of power transmission and signal transmission, are widely used in power systems, communication networks, industrial equipment, construction engineering and other fields.

[0003] In power engineering, cables are often laid using methods such as direct burial, cable trenches, and tunnels, which makes them prone to direct contact with water. They may even be submerged in water for short or long periods. Under long-term immersion in water, ordinary cross-linked polyethylene insulation materials gradually absorb moisture, causing a sharp decline in insulation and electrical performance, eventually leading to cable breakdown, resulting in a shortened lifespan of cross-linked cables and frequent accidents.

[0004] To address the issue of moisture intrusion, existing methods involve placing longitudinal water-blocking yarn, filling with gel, or water-blocking powder inside the cable. When these materials come into contact with moisture, their volume can expand to tens or even hundreds of times their original volume, forming a gel-like substance that fills the gaps in the conductor strands and prevents moisture from continuing to penetrate along the cable core. For example, Chinese Patent No. CN206574533U discloses a water-blocking and moisture-proof power cable that, by setting a moisture-absorbing layer, can absorb small amounts of moisture in a timely manner when the outermost sheath is damaged.

[0005] However, once cracks appear, moisture from the air will continuously seep in through the gaps, and the moisture-absorbing layer will actually accelerate the entry of moisture. As time goes on, the moisture-absorbing layer will gradually become saturated, causing moisture to be in contact with the waterproof layer for a long time, thus accelerating the rate at which moisture penetrates. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the existing technology of cables cannot provide corresponding water-blocking and moisture-proof performance according to the amount of water seepage in local cracks. To this end, we propose a water-blocking and moisture-proof power cable.

[0007] To achieve the above objectives, this application adopts the following technical solution: a water-blocking and moisture-proof power cable, comprising a cable core and a positioning frame wrapped around its outer side. A protective layer is wrapped around the outer side of the positioning frame, and an insulating sleeve is wrapped around the outer side of the protective layer. Multiple grooves are spaced apart around the circumference of the protective layer, and multiple flow channels are formed through the interior of the protective layer. The two ends of each flow channel are connected to adjacent grooves. An elastic rod is fixedly installed on the inner wall of each groove. A hollow bladder and a water-soluble coating are provided inside each groove. One side of the hollow bladder is connected to the elastic rod, and the other side of the hollow bladder abuts against the water-soluble coating. The interior of the hollow bladder is supersaturated with cable-specific mineral oil, which is formulated based on the core requirements of cable insulation, heat dissipation, and temperature resistance. Narrow-fraction, low-impurity mineral oils refined from specific crude oil fractions are mainly divided into three categories: paraffin-based mineral oils, naphthenic mineral oils, and synthetic modified mineral oils. The appropriate type can be selected during production based on actual usage. The protective layer has multiple sets of symmetrical grooves and channels inside. The cavity bladder is slidably connected to the grooves and channels. The side of the cavity bladder near the water-soluble coating is arc-shaped, and a guide strip is provided on the surface of the arc-shaped surface. When the water-soluble coating dissolves, the arc-shaped surface corresponds to the flow channel. A connecting rod is symmetrically installed on the side of the cavity bladder near the elastic rod. A partition is fixedly installed at the end of the connecting rod away from the cavity bladder. The width of the partition is slightly larger than the width of the channel. A sliding plate is symmetrically installed on the side of the cavity bladder near the elastic rod, and the sliding plate is embedded in the inner side of the groove.

[0008] Preferably, the elastic rod consists of an air cylinder and a piston rod. The air cylinder is fixedly installed on the surface of the groove, and the piston rod is slidably sleeved inside the air cylinder. One end of the piston rod is fixedly connected to the cavity bladder.

[0009] Preferably, multiple heat-conducting blocks are fixedly installed inside the positioning frame. The multiple heat-conducting blocks are arranged perpendicular to the axis of the positioning frame, and each heat-conducting block corresponds to a channel.

[0010] Preferably, multiple nylon strips are fixedly installed on the outer side wall of the positioning frame, and the multiple nylon strips are arranged perpendicular to the axis of the positioning frame. Multiple grooves are opened on the inner side wall of the protective layer, and the multiple grooves correspond one-to-one with the multiple nylon strips.

[0011] Preferably, a sleeve is fixedly installed on the inner side of the positioning frame, and the sleeve is fitted onto the outer side of the cable core and fits tightly.

[0012] Preferably, the insulating sleeve includes a wear-resistant layer fitted on the outside of the protective layer, and an insulating layer is fitted on the outside of the wear-resistant layer away from the protective layer.

[0013] Preferably, an anti-corrosion layer is provided between the wear-resistant layer and the insulating layer, and a hot-melt adhesive is applied between adjacent layers.

[0014] The technical effects and advantages of this invention are as follows: When the insulating sleeve is damaged and cracks appear due to external forces, moisture in the air will pass through the insulating sleeve through the cracks until it comes into contact with the water-soluble coating and is absorbed. Over time, the water-soluble coating will gradually dissolve and lose its restraint on the cavity. Under the restoring potential energy of the elastic rod, the cavity is pushed and gradually moves away from the cable core, and the temporary closed bladder formed by the cavity fails. Meanwhile, the mineral oil passes through the cavity and the partition and flows into the channel, absorbing the heat generated during the operation of the cable core and transferring the heat to the side of the cavity away from the elastic rod, so that the moisture attached to the end face is evaporated more quickly. When the seepage from local cracks is significant, the unevaporated moisture enters the flow channel through the curved surface of the cavity, where it is absorbed by the adjacent water-soluble coating. This process repeats, allowing the cable to adjust its moisture evaporation area according to the amount of seepage from the local cracks, thereby improving its water-blocking and moisture-proof performance. This does not cause an overall temperature increase or decrease in the cable; rather, it only adaptively adjusts the water-blocking and moisture-proof performance at the localized crack location. It accelerates the increase of the saturated vapor pressure of moisture, speeding up the conversion of liquid water to gas, allowing moisture trapped at the end face to quickly turn into water vapor and be discharged. This prevents prolonged adhesion and accumulation of moisture at local cracks, ensuring the cable's internal dryness. Furthermore, it creates an adaptive matching effect with moisture, effectively preventing localized moisture accumulation. By guiding and treating excess moisture, it significantly improves water-blocking and moisture-proof performance, ensuring the cable stably performs its water-blocking and moisture-proof function under complex operating conditions. Attached Figure Description

[0015] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0016] Figure 1 This is a top view of the overall structure of the present invention; Figure 2 This is an exploded view of the overall structure of the present invention; Figure 3 This is an exploded schematic diagram of the protective layer structure of the present invention; Figure 4 This is a schematic cross-sectional view of the protective layer structure of the present invention; Figure 5 This is a schematic cross-sectional view of the positioning frame structure of the present invention; Figure 6 This is a partial magnified view of the protective layer and a schematic diagram of the initial state structure of the cavity capsule of the present invention; Figure 7 This is a partial magnified view of the protective layer and a schematic diagram of the passive water-blocking state structure of the cavity bladder of the present invention; Figure 8 This is a schematic cross-sectional view of the insulating sleeve structure of the present invention; Figure 9 This is a schematic diagram of the hollow capsule structure of the present invention.

[0017] Legend: 1. Cable core; 2. Positioning frame; 21. Nylon strip; 22. Heat-conducting block; 23. Sleeve; 3. Protective layer; 31. Groove; 32. Water-soluble coating; 33. Cavity; 331. Slide plate; 332. Connecting rod; 333. Partition; 34. Flow groove; 35. Elastic rod; 36. Slide groove; 37. Channel; 38. Groove; 4. Insulating sleeve; 41. Wear-resistant layer; 42. Insulating layer; 43. Anti-corrosion layer. Detailed Implementation

[0018] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0019] The expansion effect of existing expansion materials depends on the amount of water contact. Excessive water contact leads to over-expansion and excessive internal stress, which can then compress the cable insulation or sheath, causing structural deformation. Insufficient water contact results in inadequate expansion, failing to completely seal gaps and leaving potential for water leakage. (Refer to...) Figure 1As shown, the present invention provides a technical solution: a water-blocking and moisture-proof power cable, comprising a cable core 1 and a positioning frame 2 wrapped around its outer side. A protective layer 3 is wrapped around the outer side of the positioning frame 2, and an insulating sleeve 4 is wrapped around the outer side of the protective layer 3. Multiple grooves 38 are spaced apart on the outer circumference of the protective layer 3, and multiple flow channels 34 are formed through the interior of the protective layer 3. The two ends of each flow channel 34 are connected to adjacent grooves 38. An elastic rod 35 is fixedly installed on the inner wall of each groove 38. A hollow bladder 33 and a water-soluble coating 32 are provided on the inner side of each groove 38. One side of the hollow bladder 33 is connected to the elastic rod 35, and the other side of the hollow bladder 33 is connected to the water-soluble coating 32. The protective film 32 abuts against the cavity 33, which is filled with cable-specific mineral oil. Multiple sets of grooves 36 and channels 37 are symmetrically formed inside the protective layer 3. The cavity 33 is slidably connected to the grooves 36 and channels 37. During use, the insulating sleeve 4 provides initial protection to the inside of the cable body, preventing external moisture from entering and affecting the normal operation of the cable core 1. However, when the insulating sleeve 4 is damaged and cracks appear due to external forces, moisture in the air will pass through the cracks and reach the water-soluble film 32, where it will be absorbed. It is recommended that the water-soluble film 32 be made of polyvinyl alcohol. With the water-soluble film 32... Gradually dissolving, it eventually loses its limiting effect on the cavity bladder 33. Then, under the restoring potential energy of the elastic rod 35, the cavity bladder 33 is pushed and gradually moves away from the cable core 1. When the cavity bladder 33 reaches its maximum stroke, the interior of the cavity bladder 33 and the channel 37 change from being separated to being connected. This causes the cavity bladder 33 to squeeze the supersaturated cable-specific mineral oil inside, causing the cable-specific mineral oil to flow into the channel 37 and come into contact with the positioning frame 2. This absorbs the heat generated during the operation of the cable core 1, transferring the heat to the end face of the cavity bladder 33 away from the elastic rod 35. Due to the significant temperature increase at the end face, the oil adhering to the... The moisture on the end face is evaporated more quickly, which can accelerate the increase of the saturated vapor pressure of the moisture and accelerate the conversion of liquid water into gas. This allows the moisture remaining on the end face to quickly turn into water vapor and be discharged, avoiding long-term adhesion and accumulation of moisture. The moisture gradually seeps into the inside of the cable, ensuring that the inside of the cable is dry. When the amount of moisture entering is large, the moisture that has not had time to evaporate will enter the flow channel 34 and be absorbed by the adjacent water-soluble coating 32. This process continues, forming an adaptive matching effect with the amount of moisture, which can effectively avoid local accumulation of moisture. By guiding and treating excess moisture, the water-blocking and moisture-proof performance is significantly improved, ensuring that the cable can stably perform its water-blocking and moisture-proof function under complex working conditions.

[0020] Reference Figure 1As shown in this embodiment: Connecting rods 332 are fixedly installed at each of the four corners of the cavity bladder 33 near the elastic rod 35. A partition 333 is fixedly installed at the end of the connecting rod 332 away from the cavity bladder 33. The width of the partition 333 is slightly larger than the width of the channel 37. Initially, because the sidewall of the partition 333 abuts against and tightly fits the surface of the channel 37, the cable-specific mineral oil inside the cavity bladder 33 cannot enter the channel 37. Even during daily laying, vibration, or slight deformation of the cable, the fit between the partition 333 and the channel 37 is not easily compromised. Loosening prevents the risk of mineral oil leakage and ensures the long-term effectiveness of the initial seal. As the cavity 33 gradually moves away from the inside of the cable, the side wall of the partition 333 stops contacting the surface of the channel 37. At this time, under the deformation recovery of the cavity 33, the cable-specific mineral oil passes through the connecting rod 332 and enters the channel 37 to contact the positioning frame 2 and exchange heat. This transfers heat to the side of the cavity 33 facing away from the elastic rod 35, accelerating the evaporation of moisture on the side and playing a role in water blocking and moisture prevention. This ensures that the cable can stably play a role in water blocking and moisture prevention under complex working conditions.

[0021] During the process of cable-specific mineral oil entering channel 37, to ensure that it can only enter channel 37 and not the groove 38, thus ensuring normal and effective subsequent heat transfer, refer to... Figure 1 As shown in this embodiment: a sliding plate 331 is symmetrically installed on the side of the cavity bladder 33 near the elastic rod 35. The sliding plate 331 is embedded in the inner side of the groove 36. When the elastic rod 35 pushes the cavity bladder 33, the sliding plate 331 will move upward within the groove 36. At this time, the two sides of the partition 333 have disengaged from the inner wall of the channel 37, so that the partition 333 and the channel 37 cooperate, causing the temporary closed bladder formed by the cavity bladder 33 to fail. This allows the mineral oil to pass through the cavity bladder 33 and the partition 333 and flow into the channel 37, thereby absorbing the heat generated by the operation of the cable core 1 and ensuring that the subsequent heat transfer to the end face of the cavity bladder 33 to accelerate the evaporation of moisture is normal and effective.

[0022] As the water-soluble coating 32 gradually dissolves, the cavity 33 gradually moves away from the inside of the cable, as per the reference. Figure 1 As shown in this embodiment: the elastic rod 35 consists of an air cylinder and a piston rod. The air cylinder is fixedly installed on the surface of the groove 38, and the piston rod is slidably sleeved inside the air cylinder. One end of the piston rod is fixedly connected to the cavity bladder 33. In the initial state, the air cylinder inside the air cylinder is squeezed by the piston rod. When the water-soluble coating 32 gradually dissolves and loses its restraint on the cavity bladder 33, the squeezed gas will push the piston rod to move the cavity bladder 33 away from the inside of the cable, thereby realizing subsequent heat conduction.

[0023] Reference Figure 1As shown in this embodiment: the side of the hollow bladder 33 near the water-soluble coating 32 is an arc-shaped surface, and a guide strip is provided on the surface of the arc-shaped surface. When the water-soluble coating 32 dissolves, the arc-shaped surface corresponds to the flow groove 34. When the amount of water entering is large, a large amount of water adhering to the surface of the arc-shaped surface will converge along the arc-shaped surface towards the flow groove 34 under the guidance of the guide strip and flow to the adjacent groove 38, avoiding the local accumulation of water on the arc-shaped surface and being absorbed by other undissolved water-soluble coatings 32, forming an adaptive matching effect with the amount of water, effectively avoiding the local accumulation of water. By guiding and treating excess water, the water-blocking and moisture-proof performance is significantly improved, ensuring that the cable can stably play its water-blocking and moisture-proof role under complex working conditions.

[0024] Reference Figure 1 As shown in this embodiment: multiple heat-conducting blocks 22 are fixedly installed inside the positioning frame 2. The multiple heat-conducting blocks 22 are set perpendicular to the axis of the positioning frame 2. The heat-conducting blocks 22 correspond one-to-one with the channels 37, so that when the cable-specific mineral oil comes into contact with the heat-conducting blocks 22, the heat-conducting blocks 22 are preferably made of high thermal conductivity materials such as copper and aluminum alloy. The heat-conducting blocks 22 can quickly absorb the heat generated by the operation of the cable core 1 and finally transfer it to the arc-shaped surface of the cavity 33 away from the elastic rod 35, accelerating the evaporation of the moisture attached to the arc-shaped surface. At the same time, the excess moisture that has not evaporated in time is guided into the flow groove 34 in conjunction with the arc-shaped surface guide strip, further improving the water-blocking and moisture-proof performance of the cable.

[0025] Reference Figure 1 As shown in this embodiment: Multiple nylon strips 21 are fixedly installed on the outer wall of the positioning frame 2. These nylon strips 21 are perpendicular to the axis of the positioning frame 2. Multiple grooves 31 are formed on the inner wall of the protective layer 3, each corresponding to one of the nylon strips 21. This significantly improves the cable's bending resistance and prevents bending damage. The nylon strips 21 themselves possess excellent bending fatigue resistance and rigidity. They are perpendicular to the axis of the positioning frame 2 and evenly distributed along the circumference, forming multiple sets of rigid support ribs in the radial direction of the cable. When the cable is subjected to external bending force, the nylon strips 21 can directly... It bears part of the bending stress, reducing the deformation of the cable caused by bending. At the same time, the tight fit between the two prevents misalignment or separation during bending, ensuring the integrity of the movement path of the cavity 33 and the flow of mineral oil. The evenly distributed nylon strips 21 can also evenly distribute the bending stress in the circumferential direction of the cable, avoiding local stress concentration that could lead to cracking of the protective layer 3 or damage to the insulation sleeve 4. This further reduces the risk of water infiltration and internal structural damage caused by bending, ensuring that the cable can still stably perform its water-blocking and moisture-proof performance in bending scenarios such as laying and handling.

[0026] In order to improve the stability of cable core 1 during use, refer to Figure 1As shown in this embodiment: a sleeve 23 is fixedly installed on the inner side of the positioning frame 2. The sleeve 23 is fitted on the outer side of the cable core 1 and fits tightly. It is connected to the inner wall of the positioning frame 2 by embedding and bonding. This can effectively improve the positioning stability of the cable core 1 and prevent the cable core 1 from axially moving or radially shifting inside the positioning frame 2. At the same time, it can buffer the slight vibration of the cable core 1 during operation and reduce the impact on the outer protective layer 3. The sleeve 23 can be made of elastic thermally conductive silicone to further optimize the efficiency of heat transfer from the cable core 1 to the heat block 22 and help the subsequent evaporation of moisture from the arc surface of the cavity 33.

[0027] Reference Figure 1 As shown in this embodiment: the insulating sleeve 4 includes a wear-resistant layer 41 sleeved on the outside of the protective layer 3. An insulating layer 42 is sleeved on the outside of the wear-resistant layer 41 away from the protective layer 3. It can effectively resist the friction loss between the cable and the ground and pipes during cable laying, as well as the scratching and impact of external debris. On the one hand, the outer insulating layer 42 can reliably isolate the current conduction between the cable core 1 and the outside world, ensure the safety of power transmission, and prevent the risk of leakage. On the other hand, its good weather resistance can adapt to complex environments such as high and low temperatures and humidity, reduce the impact of environmental factors on insulation performance, and further strengthen the cable's safe operation and water-proof and moisture-proof foundation.

[0028] Reference Figure 1 As shown in this embodiment: an anti-corrosion layer 43 is provided between the wear-resistant layer 41 and the insulation layer 42. A hot-melt adhesive is coated between adjacent layers. The anti-corrosion layer 43 is preferably made of polytetrafluoroethylene, which can effectively isolate acidic and alkaline substances in the soil, corrosive gases or liquids in the industrial environment, and prevent moisture from seeping in due to corrosion damage to the outer layer. At the same time, it has a certain degree of flexibility and does not affect the bending adaptability of the cable. After the hot-melt adhesive is heated and cured, it forms a tight-fitting structure without gaps, which not only prevents interlayer movement from causing protection failure, but also further blocks the path of moisture seeping in from the gaps between layers, thus building a solid outer barrier for the overall water-blocking and moisture-proofing of the cable.

[0029] Working Principle: During use, the insulating sleeve 4 first provides initial protection to the inside of the cable body, preventing external moisture from entering and affecting the normal operation of the cable core 1. When the insulating sleeve 4 is damaged and cracks appear due to external forces, moisture in the air will pass through the insulating sleeve 4 through the cracks until it comes into contact with and is absorbed by the water-soluble coating 32. As the water-soluble coating 32 gradually dissolves, it eventually loses its limiting effect on the cavity bladder 33. Then, under the restoring potential energy of the elastic rod 35, the cavity bladder 33 synchronously drives the partition 333 to be pushed and gradually away from the cable core 1, so that the side wall of the partition 333 no longer abuts against the surface of the channel 37. At this time, under the deformation recovery of the cavity bladder 33, the cable-specific mineral oil passes through the connecting rod 332 and enters the channel 37, making contact with the positioning frame 2, thereby protecting the cable core 1. The heat generated during operation is absorbed and transferred to the end face of the cavity 33 opposite to the elastic rod 35. Due to the significant increase in temperature of the end face, the moisture attached to the end face is evaporated more quickly, which can accelerate the increase of the saturated vapor pressure of the moisture and accelerate the conversion of liquid water to gas. This allows the moisture remaining on the end face to quickly turn into water vapor and be discharged, avoiding long-term adhesion and accumulation of moisture. The moisture gradually seeps into the inside of the cable, ensuring that the inside of the cable is dry. When the amount of moisture entering is large, the moisture that has not had time to evaporate will enter the flow groove 34 and be absorbed by the adjacent water-soluble coating 32. This process is repeated to form an adaptive matching effect with the amount of moisture, which can effectively avoid local accumulation of moisture. By guiding and treating excess moisture, the water-blocking and moisture-proof performance is significantly improved, ensuring that the cable can stably perform its water-blocking and moisture-proof function under complex working conditions.

[0030] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A water-blocking and moisture-proof power cable, characterized in that, The device includes a cable core and an outer positioning frame. The outer side of the positioning frame is covered with a protective layer, and the outer side of the protective layer is covered with an insulating sleeve. Multiple grooves are spaced apart on the outer circumference of the protective layer, and multiple flow channels are formed through the interior of the protective layer. The two ends of each flow channel communicate with adjacent grooves. An elastic rod is fixedly installed on the inner wall of each groove. A hollow bladder and a water-soluble coating are provided inside each groove. One side of the hollow bladder is connected to the elastic rod, and the other side of the hollow bladder abuts against the water-soluble coating. The interior of the hollow bladder is supersaturated with cable-specific mineral oil. The protective layer has multiple sets of symmetrical grooves and channels inside. The cavity is slidably connected to the grooves and channels. The side of the cavity near the water-soluble coating is arc-shaped, and a guide strip is provided on the surface of the arc-shaped surface. When the water-soluble coating dissolves, the arc-shaped surface corresponds to the flow groove. A connecting rod is symmetrically installed on the side of the cavity near the elastic rod. A partition is fixedly installed on the end of the connecting rod away from the cavity. The width of the partition is slightly larger than the width of the channel. A sliding plate is symmetrically installed on the side of the cavity near the elastic rod. The sliding plate is embedded in the inside of the groove.

2. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: The elastic rod consists of an air cylinder and a piston rod. The air cylinder is fixedly installed on the surface of the groove, and the piston rod is slidably sleeved inside the air cylinder. One end of the piston rod is fixedly connected to the hollow bladder.

3. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: Multiple heat-conducting blocks are fixedly installed inside the positioning frame. The multiple heat-conducting blocks are arranged perpendicular to the axis of the positioning frame, and each heat-conducting block corresponds to one of the channels.

4. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: Multiple nylon strips are fixedly installed on the outer side wall of the positioning frame. The multiple nylon strips are arranged perpendicular to the axis of the positioning frame. Multiple grooves are opened on the inner side wall of the protective layer. The multiple grooves correspond one-to-one with the multiple nylon strips.

5. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: A sleeve is fixedly installed on the inner side of the positioning frame, and the sleeve is fitted onto the outer side of the cable core and fits tightly.

6. The water-blocking and moisture-proof power cable according to claim 1, characterized in that: The insulating sleeve includes a wear-resistant layer sleeved on the outside of the protective layer, and an insulating layer sleeved on the outside of the wear-resistant layer opposite to the protective layer.

7. The water-blocking and moisture-proof power cable according to claim 6, characterized in that: An anti-corrosion layer is provided between the wear-resistant layer and the insulating layer, and a hot-melt adhesive is applied between adjacent layers.

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