Middle welding head of waterproof cable

Abstract

The invention discloses a waterproof cable middle welding head which comprises a conductor connector, an inner semi-conductive layer, an inner insulating layer, an outer semi-conductive layer, a shielding layer, an outer insulating layer, a grounding wire, a waterproof belt, a waterproof heat-shrinkable sleeve and an aramid fiber armoring belt. Double waterproofing is achieved through the two layers of waterproof belts and the waterproof heat-shrinkable sleeve, all functional layers are completely recovered to guarantee electrical safety, protection is enhanced through the aramid fiber armoring belt, construction is convenient and fast, the adaptation scene range is wide, severe environment can be resisted for a long time, and the service life of the cable connector is prolonged.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, and more specifically to a waterproof cable intermediate fusion joint. Background Technology

[0002] Cables, as the core carriers of power transmission and signal transmission, are widely used in urban power grid construction, rail transit, marine engineering, and other fields. When the cable laying length exceeds the factory-specified length of a single cable, a joint must be used to reliably connect the two sets of cables. However, existing cable joints have significant defects in terms of waterproof design and structural integrity, and have become one of the main causes of cable line failures.

[0003] In damp environments such as underground utility tunnels and utility galleries, existing intermediate joints often employ simple waterproof structures such as "single-layer waterproof tape wrapping" or "single heat-shrink tubing." These structures lack dual protection: firstly, the waterproof tape is prone to aging and cracking under long-term temperature and humidity changes, especially at the transition points between the joint ends and the original cable sheath, where thermal expansion and contraction can create gaps, allowing groundwater and moisture to seep in; secondly, the fit between the ordinary heat-shrink tubing and the waterproof tape is insufficient, and the tubing edges are prone to lifting, failing to form a continuous waterproof barrier. Once moisture seeps in, it gradually damages the dielectric loss performance of the inner insulation layer, triggering partial discharge and ultimately leading to insulation breakdown, potentially causing fires or power outages in severe cases.

[0004] Meanwhile, there are obvious shortcomings in the functional layer restoration of existing intermediate joints: some products omit the outer semiconductive layer or use a non-coaxial wrapping method to simplify the construction process, resulting in uneven electric field distribution between the inner insulation layer and the shielding layer, producing electric field concentration and accelerating the aging of the insulation layer; other products use aluminum foil wrapping instead of metal braiding for the shielding layer, which not only has insufficient shielding effectiveness, but also relies solely on crimping to connect with the original cable shielding layer, which is prone to poor contact and cannot effectively conduct induced charges to the ground, thereby interfering with signal transmission or causing the risk of electric shock.

[0005] Furthermore, in scenarios such as submarine cables and municipal water supply and drainage wells that are subject to long-term immersion or external impact, the outer protection of existing intermediate joints is mostly made of galvanized steel tape armor. Although it has a certain impact resistance, the steel tape is prone to corrosion due to seawater or underground stray currents, which can cause the armor layer to fail. In addition, the steel tape is heavy, which increases the difficulty of cable laying. Meanwhile, some non-metallic armored joints use ordinary fiberglass tape, which has insufficient tear resistance and is prone to breakage during cable pulling or soil compression, thus failing to protect the internal waterproof structure.

[0006] In summary, existing cable joints suffer from poor waterproofing, incomplete functional layer restoration, and low adaptability of outer protection, making it difficult to meet the long-term stable operation requirements of cable lines in complex environments. There is an urgent need for a cable joint with a multi-layer waterproof structure, complete functional layers, strong weather resistance, and impact resistance. Summary of the Invention

[0007] The purpose of this invention is to provide a waterproof cable intermediate fusion joint, which solves the problems of poor waterproof performance and incomplete restoration of functional layers in existing cable intermediate joints, resulting in unstable operation and improving the waterproof performance, electrical safety and service life of cable connections.

[0008] To achieve the above objectives, the present invention employs the following technical means:

[0009] A waterproof cable intermediate fusion joint, comprising:

[0010] Conductor connectors used to connect two sets of cable conductors;

[0011] An inner semiconductive layer is coaxially wrapped around the outside of the conductor connector;

[0012] An inner insulating layer coaxially wraps around the outer side of the inner semiconductive layer;

[0013] An outer semiconductive layer coaxially wrapped around the outer side of the inner insulating layer;

[0014] A shielding layer that wraps around the outer semiconductive layer;

[0015] An outer insulating layer that wraps around the outside of the shielding layer;

[0016] A grounding wire is arranged along the axial direction of the outer insulation layer and electrically connected to the shielding layer;

[0017] A waterproof tape wrapped around the outside of the outer insulation layer and completely covering the grounding wire;

[0018] A waterproof heat shrink sleeve that is fitted onto the outside of the waterproof strip and can fit tightly against the waterproof strip after heating;

[0019] Armor tape wrapped around the outside of the waterproof heat shrink tubing.

[0020] A further aspect of the present invention is that the conductor connector is a copper fusion joint, and is connected to the two sets of cable conductors by crimping or welding.

[0021] A further embodiment of the present invention is that both the inner insulating layer and the outer insulating layer are made of cross-linked polyethylene.

[0022] A further embodiment of the present invention is that the shielding layer is a metal braided layer.

[0023] A further embodiment of the present invention is that the grounding wire is a copper core grounding wire, one end of which is connected to the shielding layer and the other end is connected to the original grounding wire of the cable.

[0024] A further embodiment of the present invention is that the waterproof tape is a butyl rubber waterproof tape, the waterproof tape is wound in two layers, and the overlap width of two adjacent layers of the waterproof tape is not less than / of the width of the waterproof tape.

[0025] A further embodiment of the present invention is that the waterproof heat shrink tubing is a cross-linked polyethylene heat shrink tubing, and both ends of the waterproof heat shrink tubing extend to the outside of the original outer sheath of the cable.

[0026] A further embodiment of the present invention is that the armor belt is an aramid fiber belt.

[0027] The beneficial effects of this invention are:

[0028] 1. Multi-layer waterproofing with strong sealing: The double waterproofing structure consists of "two layers of waterproof tape + one layer of waterproof heat shrink tubing". The waterproof tape tightly wraps the grounding wire and the outer insulation layer. The overlap width of two adjacent waterproof tapes is not less than 1 / 2 of their own width, which can effectively prevent gaps. After heating, the waterproof heat shrink tubing tightly adheres to the waterproof tape, further blocking the path of water infiltration. The waterproofing performance is significantly better than that of existing joints that use a single waterproofing measure, and can resist the influence of moisture, groundwater and other environmental factors for a long time.

[0029] 2. Complete restoration of all functional layers, high electrical safety: From the inside out, an inner semiconductive layer, an inner insulation layer, an outer semiconductive layer, and a shielding layer are sequentially set, completely restoring the original functional structure of the cable. The inner semiconductive layer eliminates the electric field concentration between the conductor joint and the inner insulation layer, the outer semiconductive layer avoids the electric field distortion between the inner insulation layer and the shielding layer, and the metal braided shielding layer achieves electromagnetic shielding, effectively preventing external electromagnetic interference. At the same time, in conjunction with the grounding wire, the induced charge of the shielding layer is conducted to the ground, completely solving the problems of electric field concentration, electromagnetic interference, and leakage risk caused by the lack of functional layers in existing joints, and improving the electrical safety of cable operation.

[0030] 3. Stable structure, good protection, and long service life: The outer armor belt is made of aramid fiber, which can effectively resist external impact, tension, soil compression and other external forces, and avoid damage to the internal waterproof structure and functional layer due to external forces; and the inner and outer insulation layers are made of cross-linked polyethylene, and the waterproof belt is made of butyl rubber, all of which have excellent aging resistance, which can extend the overall service life of the joint and are suitable for long-term outdoor or harsh environment use.

[0031] 4. Convenient construction and high practicality: The connection methods of each component are clear, and the construction steps are from conductor welding and functional layer restoration to waterproof and armor layer construction. The process is smooth and does not require complicated special equipment. On-site operators can complete the construction by simply following the standard steps. At the same time, this joint is suitable for various scenarios such as underground cable engineering and cable laying in humid environments. It has good compatibility with cables of different cross-sections and types, and is highly practical. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a cross-sectional view of the present invention;

[0034] Figure label:

[0035] 1. Conductor connector; 2. Inner semiconductive layer; 3. Inner insulating layer; 4. Outer semiconductive layer; 5. Shielding layer; 6. Outer insulating layer; 7. Grounding wire; 8. Waterproof tape; 9. Waterproof heat shrink tubing; 10. Armoring tape. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1-2 As shown, a waterproof cable intermediate fusion joint includes: a conductor connector 1 for connecting two sets of cable conductors; an inner semiconductive layer 2 coaxially wrapped around the outside of the conductor connector 1; an inner insulation layer 3 coaxially wrapped around the outside of the inner semiconductive layer 2; an outer semiconductive layer 4 coaxially wrapped around the outside of the inner insulation layer 3; a shielding layer 5 wrapped around the outside of the outer semiconductive layer 4; an outer insulation layer 6 wrapped around the outside of the shielding layer 5; a grounding wire 7 arranged axially along the outer insulation layer 6 and electrically connected to the shielding layer 5; a waterproof tape 8 wrapped around the outside of the outer insulation layer 6 and completely wrapping the grounding wire 7; a waterproof heat shrink sleeve 9 sleeved on the outside of the waterproof tape 8 and which can be tightly attached to the waterproof tape 8 after heating; and an armor tape 10 wrapped around the outside of the waterproof heat shrink sleeve 9.

[0038] Conductor connector 1 is a copper fusion joint, connected to the two sets of cable conductors by crimping or welding. The advantages of this setup are: copper has excellent conductivity, reducing contact resistance at the conductor connection point, minimizing heat generation during current transmission, and preventing malfunctions caused by localized overheating; crimping or welding ensures a tight fixation between the conductor and connector, guaranteeing mechanical stability and preventing loosening due to vibration or tension during long-term use, while also further improving conductivity continuity and ensuring efficient and stable power or signal transmission.

[0039] Both the inner insulation layer 3 and the outer insulation layer 6 are made of cross-linked polyethylene. The advantages of this design are as follows: cross-linked polyethylene has excellent electrical insulation properties, effectively blocking current leakage and preventing short circuits between internal and external circuits, thus ensuring the safe operation of the cable; simultaneously, this material is resistant to aging and has a wide temperature range, making it less prone to cracking, deformation, or decreased insulation performance under harsh environments such as long-term high and low temperature fluctuations and humidity, extending the service life of the insulation layer and maintaining the stability of the overall insulation effect of the joint; furthermore, cross-linked polyethylene also possesses a certain degree of mechanical strength, providing initial protection for internal conductors, semi-conductive layers, and other structures.

[0040] Shielding layer 5 is a metal braided layer. The advantages of this design are: the metal braided layer has excellent electromagnetic shielding performance, effectively blocking external electromagnetic signals from interfering with the signals transmitted inside the cable, while also preventing electromagnetic radiation generated by the cable itself from affecting external equipment, ensuring the accuracy and stability of signal transmission; compared to shielding materials such as aluminum foil, the metal braided layer has higher mechanical strength, is less prone to damage during construction or use, and its braided structure has a certain degree of flexibility, adapting to the bending requirements of cable joints and preventing shielding layer breakage due to bending; furthermore, the connection between the metal braided layer and the original cable shielding layer is more convenient, achieving a tight electrical connection through welding, crimping, etc., ensuring the continuity of the shielding function.

[0041] Grounding wire 7 is a copper core grounding wire. One end of the copper core grounding wire is connected to the shielding layer 5, and the other end is connected to the original grounding wire of the cable. The advantages of the above setting are: the copper core material has excellent conductivity, which can quickly conduct the induced charge accumulated on the shielding layer to the ground, avoiding the risk of electric field distortion or electric shock caused by charge accumulation, and ensuring the safety of operators and equipment; the two ends of the grounding wire are connected to the shielding layer and the original grounding wire of the cable respectively, which can form a complete grounding loop, ensuring that the shielding layer is always in a grounded state and avoiding the failure of the shielding function due to grounding discontinuity; at the same time, the copper core grounding wire has strong corrosion resistance and is not easy to rust in humid or underground environments, which can maintain good conductivity for a long time and ensure the stability of the grounding loop.

[0042] The waterproof tape 8 is a butyl rubber waterproof tape, and it is wrapped in two layers. The overlap width between two adjacent layers of waterproof tape 8 is not less than 1 / 2 of the width of the waterproof tape. The advantages of the above configuration are: the butyl rubber waterproof tape has extremely strong adhesion and sealing properties, which can tightly adhere to the outer insulation layer and the surface of the grounding wire, effectively blocking the path of water penetration. Moreover, this material has good weather resistance and is not prone to aging or cracking during long-term use, resulting in a long-lasting waterproof effect; the two-layer wrapping design can form a double waterproof barrier. Even if the outer waterproof tape is partially damaged, the inner waterproof tape can still play a waterproof role, further improving the reliability of waterproofing; the overlap width of not less than 1 / 2 of the width between adjacent layers can avoid gaps between the waterproof tapes, eliminate the risk of water seeping in from the overlap, and ensure that the waterproof tape forms a continuous and complete waterproof covering layer.

[0043] The waterproof heat shrink tubing 9 is a cross-linked polyethylene heat shrink tubing, and both ends of the waterproof heat shrink tubing 9 extend to the outside of the original cable sheath. The advantages of the above configuration are as follows: after heating, the cross-linked polyethylene heat shrink tubing can shrink tightly and adhere to the surface of the waterproof tape, forming a seamless waterproof protective layer. This not only enhances the waterproof effect but also fixes the waterproof tape, preventing it from shifting or warping during long-term use. The extension of both ends of the tubing to the outside of the original cable sheath completely covers the transition area between the joint and the original cable sheath, eliminating gaps caused by structural differences and preventing moisture from seeping in from the transition area. In addition, the cross-linked polyethylene material has good aging resistance and chemical corrosion resistance, protecting the internal waterproof tape and functional layer from external environmental erosion and extending the overall service life of the joint.

[0044] The armor tape 10 is made of aramid fiber. The advantages of this design are: aramid fiber tape has extremely high mechanical strength and tear resistance, effectively resisting external impacts, compression, tension, and other external forces, protecting vulnerable components such as the internal waterproof structure, insulation layer, and shielding layer from damage, and improving the overall resistance of the joint to external forces; compared to traditional metal armor tape, aramid fiber tape is lightweight, reducing the difficulty of cable laying and the intensity of construction labor; at the same time, this material has excellent corrosion resistance and weather resistance, is not easily corroded or aged in environments such as seawater and underground stray currents, and is non-conductive, avoiding additional electrical risks caused by conductive armor tape, making it suitable for various complex application scenarios.

[0045] Working principle

[0046] The working principle of this waterproof cable intermediate fusion joint is to achieve reliable connection, electrical performance assurance, waterproof sealing, and structural protection of two sets of cables through the synergistic effect of its multi-layer structure, as detailed below:

[0047] Conductor connection and current transmission:

[0048] As the core conductive component, conductor connector 1 forms a rigid connection with the two sets of cable conductors through crimping or welding. Utilizing the high conductivity of copper, it ensures low-resistance transmission of current or signals between the two sets of cables, reducing energy loss or signal attenuation caused by contact resistance.

[0049] Electric field uniformity and insulation protection:

[0050] The inner semiconducting layer 2 tightly wraps between the conductor connector 1 and the inner insulating layer 3, which can eliminate the electric field concentration caused by the cross-sectional change at the conductor connection point and avoid the inner insulating layer 3 from being broken down due to excessively high local field strength.

[0051] The inner insulation layer 3 is made of cross-linked polyethylene, which, with its excellent insulation properties, blocks the current path between the conductor and the external structure, forming the main insulation barrier.

[0052] The outer semiconductive layer 4 is wrapped around the outer side of the inner insulating layer 3, which can uniformly distribute the electric field between the inner insulating layer and the shielding layer 5 and prevent insulation aging caused by electric field distortion.

[0053] Electromagnetic shielding and grounding protection:

[0054] The shielding layer 5 is a metal braided layer, which can effectively block external electromagnetic interference and at the same time constrain the electromagnetic field inside the cable to radiate outward, ensuring the stability of signal transmission. One end of the copper core grounding wire 7 is connected to the shielding layer 5, and the other end is connected to the original grounding wire of the cable. It can conduct the charge induced on the shielding layer to the ground, avoiding the accumulation of charge that may cause safety hazards or interference signals.

[0055] Multi-layer waterproof seal:

[0056] The butyl rubber waterproof tape 8 tightly wraps the outer insulation layer 6 and the grounding wire 7 by wrapping two layers with an overlap of ≥1 / 2 width, and uses its high adhesion and sealing properties to form the first waterproof barrier to prevent moisture from seeping in from the outside.

[0057] After being heated and shrunk, the waterproof heat shrink tubing 9 fits tightly against the waterproof tape 8, forming a second waterproof barrier. At the same time, the design of extending to the outside of the original outer sheath of the cable at both ends eliminates the gap at the transition between the joint and the cable body, further enhancing the waterproof effect.

[0058] Structural protection and durability assurance:

[0059] The outer insulation layer 6 provides auxiliary insulation and physical protection to the shielding layer 5; the outermost aramid fiber armor tape 10, with its high strength and tear resistance, resists external impacts, compression and other external forces, protecting all internal functional layers and waterproof structures from damage, and ensuring that the joint can work stably for a long time in complex environments.

[0060] Through the layered collaboration of the above structures, the fusion joint can not only ensure the continuity of the electrical performance of the cable, but also ensure the safety and durability of the joint in humid and multi-force environments through multiple protections.

[0061] Example 1

[0062] Intermediate fusion joint for low-voltage power cables

[0063] Structural parameters

[0064] Conductor connector 1: Made of T2 copper, 12mm in diameter, and hydraulically pressed to a cross-section of 120mm. 2 The copper core cable conductor connection has a crimping pressure of 80-100kN;

[0065] Inner semiconductive layer 2: Semiconductive butyl rubber tape, with a wrapping thickness of 2.5mm, covering the conductor connector and the cable conductors at both ends for 150mm each;

[0066] Inner insulation layer 3: Cross-linked polyethylene insulation tape, wrapping thickness 6mm, heat curing temperature 130-150℃;

[0067] Outer semiconductive layer 4: semiconductive polyolefin tape, with a wrapping thickness of 2mm, and the same coverage area as the inner semiconductive layer 2;

[0068] Shielding layer 5: Copper wire braided layer, braiding density 90%, both ends are soldered to the original shielding layer of the cable, and the soldering length is ≥30mm;

[0069] Outer insulation layer 6: Cross-linked polyethylene insulation tube, 4mm thick, heat shrinkage temperature 120-140℃;

[0070] Grounding wire 7: 25mm 2 The copper core grounding wire is soldered to the shielding layer at one end and crimped to the original grounding wire of the cable at the other end.

[0071] Waterproof tape 8: Butyl rubber waterproof tape (60mm wide), wrapped in two layers with an overlap of 30mm;

[0072] Waterproof heat shrink tubing 9: Cross-linked polyethylene heat shrink tubing, shrinkage rate ≥55%, extending 60mm from both ends to the outside of the original cable sheath;

[0073] Armor belt 10: Impregnated aramid fiber belt (50mm wide), overlap width 25mm, and both ends are fixed with stainless steel strapping.

[0074] Applicable Scenarios

[0075] 10kV-35kV medium voltage power cables are suitable for damp environments such as underground pipe corridors and cable trenches in industrial parks.

[0076] Example 2

[0077] Intermediate fusion joint for low-voltage signal cables

[0078] Structural parameters

[0079] Conductor connector 1: Made of phosphorus deoxidized copper, 5mm in diameter, soldered to a 10mm cross-section connector. 2 For signal cable conductor connections, the welding temperature is 250-300℃;

[0080] Inner semiconductive layer 2: Semiconductive silicone tape, 1mm thick, covering the conductor connector and 80mm cable conductors at both ends;

[0081] Inner insulation layer 3: Cross-linked polyethylene film tape, 3mm thick, naturally cured;

[0082] Outer semiconductive layer 4: semiconductive polyester tape, with a wrapping thickness of 1mm, and the same coverage area as the inner semiconductive layer 2;

[0083] Shielding layer 5: Tinned copper wire braided layer with a braiding density of 85%, both ends are crimped to the original shielding layer of the cable;

[0084] Outer insulation layer 6: Polyvinyl chloride insulating tube, 2mm thick, tightly fitted to the outside of shielding layer 5;

[0085] Grounding wire 7: 10mm 2 The copper core grounding wire is crimped to the shielding layer 5 at one end and welded to the original grounding wire of the cable at the other end.

[0086] Waterproof tape 8: Butyl rubber waterproof tape (40mm wide), wrapped in two layers with an overlap width of 20mm;

[0087] Waterproof heat shrink tubing 9: Polyolefin heat shrink tubing, shrinkage rate ≥50%, both ends extend 40mm to the outside of the original cable sheath;

[0088] Armor belt 10: Lightweight aramid fiber belt (30mm wide), with an overlap width of 15mm, and secured at both ends with nylon straps.

[0089] Applicable Scenarios

[0090] Low-voltage signal cables of 380V and below are suitable for building security wiring and signal transmission lines in subway tunnels.

[0091] Example 3

[0092] Cable intermediate fusion joint for underwater environment

[0093] Structural parameters

[0094] Conductor connector 1: Made of oxygen-free copper, 15mm in diameter, ultrasonically welded to a cross-section of 185mm².2 For waterproof cable conductor connections, the welding time is 3-5 seconds;

[0095] Inner semiconductive layer 2: Semiconductive ethylene propylene rubber tape, with a wrapping thickness of 3mm, covering the conductor connector and the cable conductors at both ends for 200mm each;

[0096] Inner insulation layer 3: Water-resistant cross-linked polyethylene tape, wrapping thickness 8mm, heat curing temperature 140-160℃;

[0097] Outer semiconductive layer 4: Semiconductive nitrile rubber tape, with a wrapping thickness of 2.5mm, and the same coverage area as the inner semiconductive layer 2;

[0098] Shielding layer 5: Monel alloy wire braided layer, braiding density 95%, both ends are argon arc welded to the original cable shielding layer;

[0099] Outer insulation layer 6: Chlorinated polyethylene insulation tube, 5mm thick, heat shrinkage temperature 130-150℃;

[0100] Grounding wire 7: 35mm 2 The tinned copper core grounding wire is welded to the shielding layer 5 at one end and bolted to the original grounding wire of the cable at the other end.

[0101] Waterproof tape 8: Thickened butyl rubber waterproof tape (80mm wide), wrapped in two layers with an overlap width of 40mm, and a pressure of 0.2MPa is applied during wrapping;

[0102] Waterproof heat shrink tubing 9: Double-walled cross-linked polyethylene heat shrink tubing (inner layer contains hot melt adhesive), shrinkage rate ≥60%, both ends extend 80mm to the outside of the original cable sheath;

[0103] Armor belt 10: High-strength dipped aramid fiber belt (60mm wide), overlap width 30mm, both ends are fixed with titanium alloy strapping, and the winding tension is 50-60N.

[0104] Applicable Scenarios

[0105] Underwater cables (such as those used in submarine observation networks and power supply lines for underwater robots) can withstand water pressure of 0.5 MPa.

[0106] The examples provided in this invention are not intended to limit the implementation. Those skilled in the art will recognize that various variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations, and any obvious variations or modifications derived therefrom are still within the scope of this invention.

Claims

1. A waterproof cable intermediate fusion joint, characterized in that, include: Conductor connector (1) for connecting two sets of cable conductors; An inner semiconductive layer (2) is coaxially wrapped around the outside of the conductor connector (1); An inner insulating layer (3) is coaxially wrapped around the outer side of the inner semiconductive layer (2); The outer semiconductive layer (4) is coaxially wrapped around the outer side of the inner insulating layer (3); A shielding layer (5) wrapped around the outer semiconductive layer (4); An outer insulating layer (6) is wrapped around the outside of the shielding layer (5); A grounding wire (7) is arranged axially along the outer insulation layer (6) and electrically connected to the shielding layer (5); A waterproof tape (8) that is wrapped around the outside of the outer insulation layer (6) and completely covers the grounding wire (7); A waterproof heat shrink sleeve (9) that is fitted on the outside of the waterproof strip (8) and can fit tightly against the waterproof strip (8) after heating; Armor tape (10) wrapped around the outside of the waterproof heat shrink tubing (9).

2. The waterproof cable intermediate fusion joint according to claim 1, characterized in that, The conductor connector (1) is a copper fusion connector and is connected to the two sets of cable conductors by crimping or welding.

3. A waterproof cable intermediate fusion joint according to claim 1, characterized in that, Both the inner insulation layer (3) and the outer insulation layer (6) are made of cross-linked polyethylene.

4. A waterproof cable intermediate fusion joint according to claim 1, characterized in that, The shielding layer (5) is a metal braided layer.

5. A waterproof cable intermediate fusion joint according to claim 1, characterized in that, The grounding wire (7) is a copper core grounding wire. One end of the copper core grounding wire is connected to the shielding layer (5), and the other end is connected to the original grounding wire of the cable.

6. A waterproof cable intermediate fusion joint according to claim 1, characterized in that, The waterproof tape (8) is a butyl rubber waterproof tape. The waterproof tape (8) has two layers, and the overlap width between two adjacent layers of the waterproof tape (8) is not less than 1 / 2 of the width of the waterproof tape.

7. A waterproof cable intermediate fusion joint according to claim 1, characterized in that, The waterproof heat shrink tubing (9) is a cross-linked polyethylene heat shrink tubing, and both ends of the waterproof heat shrink tubing (9) extend to the outside of the original outer sheath of the cable.

8. A waterproof cable intermediate fusion joint according to claim 1, characterized in that, The armor belt (10) is an aramid fiber belt.

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