Crosslinked polyethylene insulated power cable connector and method

Abstract

The present application relates to the technical fields of cross-linked polyethylene insulated power cable connector accessories, and provides a cross-linked polyethylene insulated power cable connector and method, the connector is used for the connection of two cable bodies, the cable body comprises a core, an insulation layer, an armor layer and an outer sheath from inside to outside, the insulation layer, the armor layer and the outer sheath are stripped in a stepped manner when connected, the connector comprises a flexible joint, and the flexible joint is located at the connection of the two cable bodies, it can be understood that the present application can adapt to the cores with different diameters through movable pressing blocks and pressing pieces, and matching problems caused by small range errors can be avoided, the insulation tape and the armor tape are wound at the stripping positions of the insulation layer and the armor layer, and are connected to an extension ring, the structure strength and the sealing property of the connection position are enhanced by cooperating with a first heat shrink sleeve, the first heat shrink sleeve, the outer sheath and a pressing device are connected by a second heat shrink sleeve, a third heat shrink sleeve is additionally arranged at the connection position, and the overall connection strength and sealing performance are further enhanced.

Description

Technical Field

[0001] This invention relates to the field of cross-linked polyethylene insulated power cable connectors and accessories, and more specifically, to a cross-linked polyethylene insulated power cable connector and method. Background Technology

[0002] Cross-linked polyethylene insulated power cables refer to power cables that use cross-linked polyethylene (XLPE) as insulation material. Their conductors can operate at temperatures up to 90°C for extended periods. They are characterized by excellent electrical performance, outstanding heat aging resistance, high mechanical strength, and easy installation and maintenance, and are widely used in power transmission and distribution systems.

[0003] Cable connectors are specialized components used to achieve electrical connections and mechanical fixation between cables. Existing connection methods include wrap-around joints, heat-shrink joints, prefabricated joints, and cold-shrink joints. These connection methods generally suffer from the following problems:

[0004] 1. If the crimping process at the conductor connection is poor (such as insufficient crimping force or mismatch between the connecting conductor and the wire core), it will lead to increased contact resistance, causing local heating, and in severe cases, it may cause the joint to burn out.

[0005] 2. When making a joint, the cable insulation layer, armor layer, and outer sheath all need to be stripped. The cut point will cause severe electrical stress concentration, becoming the weakest link in the entire joint.

[0006] 3. Inconsistent installation quality is caused by factors such as improper operation by construction personnel and insufficient reserved cable length.

[0007] To address the aforementioned issues, this application proposes a cross-linked polyethylene insulated power cable connector and method. Summary of the Invention

[0008] The purpose of this invention is to provide a cross-linked polyethylene insulated power cable connector and method, which ensures connection stability and good contact through one-to-one compression, and uses step-by-step recovery wrapping at the peeling point to ensure sealing, insulation stability, and connection strength, thereby solving the problems in the prior art.

[0009] The objective of this invention can be achieved through the following technical solution: a cross-linked polyethylene insulated power cable connector for connecting two cable bodies, wherein the cable body comprises, from the inside out, a conductor, an insulation layer, an armor layer, and an outer sheath, wherein the insulation layer, armor layer, and outer sheath are peeled off in a stepped manner during connection, and the connector comprises:

[0010] A flexible joint, wherein the flexible joint is located at the connection point of two cable bodies;

[0011] A connecting conductor, which is a metal conductive component, is used for electrical conduction of the wire cores in two cable bodies. The number of connecting conductors is the same as the number of wire cores in a single cable body. The flexible joint and the connecting conductor are respectively formed with a pressure block and a pressure plate with an adjustable wire core insertion diameter.

[0012] A clamping device, comprising an outer clamping sleeve and an inner clamping sleeve that spirally tighten along the axial direction, thereby tightening an adjustable clamping block and clamping plate and radially pressing the wire core. The outer clamping sleeve and the inner clamping sleeve are also provided with sealing rings at the spiral clamping positions.

[0013] An insulating tape, wherein at least part of both ends of the insulating tape are wrapped around the outside of the stripped insulating layer and the clamp, and the middle part is wrapped around the stripped portion that has not been inserted into the connecting conductor;

[0014] Armor tape, which wraps around the outside of the insulating tape and is at least partially located outside the stripped armor layer;

[0015] It also includes a first heat shrink sleeve, a second heat shrink sleeve, and a third heat shrink sleeve.

[0016] Preferably, the first heat shrink sleeve is tightened around the outside of the armor tape and forms a circular cover; the second heat shrink sleeve is connected between the clamp and the outside of the outer sheath and forms a circular cover over the stripped portion of the cable body; the third heat shrink sleeve is connected between the two second heat shrink sleeves and forms a circular cover over the clamp.

[0017] Preferably, the flexible joint includes a connecting post in the middle, and the pressure blocks are respectively formed at both ends of the connecting post. Several pressure blocks are provided at the same end, and a first opening is formed between adjacent pressure blocks. At the same time, a connecting hole for connecting conductors is also formed between adjacent pressure blocks.

[0018] Preferably, the connecting conductor includes a connecting portion fixed in the connecting post, and the pressure plates are respectively formed at both ends of the connecting portion, with a second opening formed between the pressure plates at the same end.

[0019] Preferably, a positioning platform is formed on the inner side of the connecting part, and a barb is formed on the inner side of the pressing plate.

[0020] Preferably, the diameter of the connecting column is larger than the diameter of all the pressure blocks on one side in the tightened state, and a chamfer is formed at the connection. The outer pressure sleeve and the inner pressure sleeve are both formed with corresponding chamfers that form radial pressure.

[0021] Preferably, the outer pressure sleeve and the inner pressure sleeve have an extension ring formed at the end away from the mating point, which is connected to the insulating tape, and one end of the insulating tape is wrapped around the outside of the extension ring.

[0022] Preferably, the outer and inner pressure sleeves are both formed with second connecting ribs, the outer sheath is formed with first connecting ribs, and the second heat shrink sleeve is tightened around the second and first connecting ribs.

[0023] The present invention also provides a method for connecting cross-linked polyethylene insulated power cables, according to the above-described connector, comprising the following steps:

[0024] S1. Peel off the insulation layer, armor layer, and outer sheath in a stepped manner. Cut the first connecting rib around the outer sheath near the peeled armor layer and untwist the exposed wire core. At the same time, perform the same operation on the other cable body.

[0025] S2. A first heat shrink sleeve, a second heat shrink sleeve, a third heat shrink sleeve and an outer pressure sleeve are sequentially fitted onto the outside of one cable body, and a sealing ring is pressed into the outer pressure sleeve. A first heat shrink sleeve, a second heat shrink sleeve and an inner pressure sleeve are sequentially fitted onto the outside of another cable body.

[0026] S3. Insert the wire cores on both ends of the two cable bodies into the connecting conductor and abut them against the end face of the positioning platform;

[0027] S4. Apply glue to the outer thread of the inner pressure sleeve and tighten it with the outer pressure sleeve. The beveled surfaces in the outer and inner pressure sleeves are squeezed against the beveled surfaces between the connecting column and the pressure block. The pressure block and pressure plate are tightened radially. Finally, the barb forms an indentation on the outside of the wire core and is embedded inside. The pressure plate is tightened and fits against the arc surface of the outside of the wire core.

[0028] S5. Wrap the insulating tape around the outside of the bare wire core, then continuously wrap the insulating tape around the extension ring and the insulation peeling section, and wrap the armor tape around the outside of the insulating tape and continue to wrap it to the armor peeling section;

[0029] S6. The first heat shrink sleeve slides to the outside of the armor belt, heats it, and finally tightens it to the outside of the armor belt; the second heat shrink sleeve slides to the outside of the clamp and the outer sheath, corresponding to the second connecting rib and the first connecting rib, heats it, and tightens it, and the second heat shrink sleeve also covers the stroke of the first heat shrink sleeve; the third heat shrink sleeve slides to the outside of the two second heat shrink sleeves and heats and tightens them.

[0030] Preferably, the armor belt is made of fiberglass woven belt.

[0031] The beneficial effects of this invention are:

[0032] This invention, by setting movable pressure blocks and pressure plates, can adapt to wire cores of different diameters within a certain range during connection, avoiding mismatch between wire cores and connecting conductors due to small-range errors;

[0033] In this invention, insulating tape and armor tape are wrapped again at the peeling point of the insulating layer and armor layer. The two ends of the insulating tape are connected to the extension ring and the outside of the insulating layer. The armor tape tightens the insulating layer and armor layer at the connection point, and the other end is also wrapped around the extension ring. Finally, a first heat shrink sleeve is set on the outside of the armor tape to form a strength guarantee, ensuring the structural strength and sealing of the connection point.

[0034] The present invention connects the first heat shrink sleeve, the outer sheath, and the outside of the clamping device through a second heat shrink sleeve, and also provides a third heat shrink sleeve at the connection between the clamping device and the two second heat shrink sleeves to enhance the connection strength and sealing performance. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a structural schematic diagram of the appearance of the present invention;

[0037] Figure 2 This is a partially enlarged and partially cross-sectional structural diagram of the present invention;

[0038] Figure 3 A schematic diagram showing the connection between the cable and the flexible joint.

[0039] Figure 4 A schematic diagram showing a partial cross-section of the flexible joint and connecting conductor;

[0040] Figure 5 This is a schematic diagram of the cable in its stripped state.

[0041] The attached diagram lists the components represented by each number as follows:

[0042] In the diagram: 1. Flexible connector; 11. Connecting post; 12. Pressure block; 13. First opening; 14. Connecting hole; 2. Connecting conductor; 21. Connecting part; 211. Positioning platform; 22. Pressure plate; 221. Barb; 23. Second opening; 3. Cable body; 31. Core; 32. Insulation layer; 33. Armor layer; 34. Outer sheath; 341. First connecting rib; 4. Clamping device; 41. Outer pressure sleeve; 42. Inner pressure sleeve; 43. Second connecting rib; 44. Extension ring; 45. Sealing ring; 5. Insulating tape; 6. Armor tape; 7. First heat shrink sleeve; 8. Second heat shrink sleeve; 9. Third heat shrink sleeve. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0044] like Figure 1 - Figure 5 As shown, this embodiment provides a cross-linked polyethylene insulated power cable connector for connecting two cable bodies 3. The cable body 3 includes, from the inside out, a conductor 31, an insulation layer 32, an armor layer 33, and an outer sheath 34. The outer sheath 34 is made of polyvinyl chloride (PVC), polyethylene (PE), or low-smoke halogen-free polyolefin (LSZH) materials, depending on the application scenario and performance requirements. The insulation layer 32, armor layer 33, and outer sheath 34 are peeled off in a stepped manner during connection. The connector includes:

[0045] The flexible joint 1 is located at the connection point of the two cable bodies 3;

[0046] The connecting conductor 2 is a metal conductive component used for electrical conduction of the wire cores 31 in the two cable bodies 3. The number of connecting conductors 2 is the same as the number of wire cores 31 in a single cable body 3. The flexible joint 1 and the connecting conductor 2 are respectively formed with pressure blocks 12 and pressure plates 22 that can adjust the insertion diameter of the wire cores 31. This solves the problem of poor contact caused by poor crimping process or small errors in the wire core diameter. Through the movable pressure block 12 and pressure plate 22 structure, it can automatically adapt to wire cores of different diameters within a certain range, ensuring a tight connection, thereby effectively reducing contact resistance and avoiding local heating and burning of the joint.

[0047] The clamping device 4 includes an outer clamping sleeve 41 and an inner clamping sleeve 42 that spirally tighten along the axial direction. The spiral tightens the adjustable clamping block 12 and the clamping plate 22 and radially presses the wire core 31. Its working principle is to use the mechanical force amplification effect of the spiral drive to convert the axial rotational motion into a uniform radial clamping force, ensuring that sufficient contact pressure is formed between the clamping plate 22 and the wire core 31, while avoiding the problem of inconsistent crimping quality caused by uneven manual operation. The outer clamping sleeve 41 and the inner clamping sleeve 42 are also provided with a sealing ring 45. The sealing ring 45 is deformed under pressure after clamping, which can effectively prevent external contaminants such as moisture and humidity from seeping in from the spiral connection, significantly improving the long-term sealing reliability of the connection.

[0048] The insulating tape 5 has at least two ends partially wrapped around the outside of the stripped insulation layer 32 and the clamping device 4, and the middle part is wrapped around the stripped part that has not been inserted into the connecting conductor 2. The insulating tape 5 can be combined according to specific needs, such as self-adhesive insulating tape, PVC electrical tape, waterproof sealing tape, etc. The main purpose of the insulating tape 5 is to strengthen and repair the weakest link where the electrical stress is most severe at the stripped part of the cable insulation layer 32. By connecting the two ends of the insulating tape 5 to the insulation layer 32 and the clamping device 4 respectively, a continuous insulation structure is reconstructed, which effectively prevents partial discharge caused by electric field distortion.

[0049] The armor tape 6 is wrapped around the outside of the insulation tape 5 and is at least partially located outside the stripped armor layer 33; the purpose is to restore the mechanical strength and tensile properties lost after the cable armor layer 33 is stripped. The armor tape 6 forms a radial tightening force on the insulation layer 32 and the armor layer 33 at the connection, firmly locking the entire structure after connection into a whole, which significantly enhances the joint's ability to resist external mechanical damage and tensile force.

[0050] It also includes a first heat shrink sleeve 7, a second heat shrink sleeve 8, and a third heat shrink sleeve 9. The first heat shrink sleeve 7 is tightened around the armor tape 6 to form a circular cover. Its function is to provide the first layer of mechanical protection and sealing, tightly wrapping the armor tape 6 to prevent it from loosening or shifting, while forming a smooth and solid external base to provide good support for the subsequent installation of the heat shrink sleeve. The second heat shrink sleeve 8 is connected between the clamping device 4 and the outer sheath 34 and forms a circular cover over the stripped portion of the cable body 3. Its purpose is to act as the main external sealing layer, spanning and covering the entire stripping transition area from the original cable outer sheath 34 to the intermediate clamping device 4, effectively... To prevent moisture, dust, and other external environmental contaminants from penetrating the connector, the third heat-shrink sleeve 9 connects between the two second heat-shrink sleeves 8 and forms a circular cover over the clamping device 4. This is to reinforce the protection of the clamping device 4 and the mating gap between the two second heat-shrink sleeves 8. By further heat-shrinking and tightening, potential moisture penetration channels are eliminated, significantly improving the overall strength and sealing reliability of the connection, especially the clamping device 4 area. The three heat-shrink sleeves together form a multi-layered sealing and protection structure. Through stepped coverage and multiple tightening, the connection is ensured to have sealing, insulation, and structural integrity comparable to or even better than the cable body.

[0051] Furthermore, the flexible joint 1 includes a connecting post 11 in the middle, and pressure blocks 12 are respectively formed at both ends of the connecting post 11. Several pressure blocks 12 are provided at the same end, and a first opening 13 is formed between adjacent pressure blocks 12. The first opening 13 provides the necessary space for the radial contraction of the pressure blocks 12, so that the pressure blocks 12 can move towards the center under the action of the clamping device 4, thereby achieving the clamping of wire cores 31 of different diameters. At the same time, a connecting hole 14 for connecting conductor 2 is also formed between adjacent pressure blocks 12. The connecting hole 14 provides the installation position of the connecting conductor 2, ensuring that the connecting conductor 2 can be accurately and firmly connected with the flexible joint 1.

[0052] Furthermore, the connecting conductor 2 includes a connecting portion 21 fixed in the connecting post 11, and pressure plates 22 are respectively formed at both ends of the connecting portion 21. The purpose is to enable a single connecting conductor 2 to simultaneously connect the corresponding cores 31 of the left and right cables to form a direct low-impedance electrical path; a second opening 23 is formed between the pressure plates 22 at the same end.

[0053] Furthermore, a positioning platform 211 is formed on the inner side of the connecting part 21. The positioning platform 211 serves as a limiting structure for the insertion depth of the wire core 31, ensuring that the end faces of the wire cores 31 of the two cables are accurately aligned inside the connecting conductor 2, achieving optimal electrical contact and avoiding poor contact or stress concentration caused by insufficient or excessive insertion depth. A barb 221 is formed on the inner side of the pressure plate 22. When the pressure plate 22 is radially tightened by the clamping device 4, the barb 221 can be embedded in the conductor material of the wire core 31 to form a mechanical interlocking structure, which enhances the pull-out resistance, prevents the connection from loosening, and further reduces the contact resistance.

[0054] Furthermore, the diameter of the connecting column 11 is larger than the diameter of all the pressure blocks 12 on one side in the tightened state, and a chamfer is formed at the connection. The outer pressure sleeve 41 and the inner pressure sleeve 42 are both formed with corresponding chamfers that form radial pressure. The working principle is: when the outer pressure sleeve 41 and the inner pressure sleeve 42 are screwed together, the chamfers inside them will slide relative to the chamfers on the connecting column 11 and the pressure block 12, thereby efficiently converting the axial helical thrust into radial clamping force on the pressure block 12 and the pressure plate 22, realizing precise control and uniform transmission of clamping force.

[0055] Furthermore, the outer pressure sleeve 41 and the inner pressure sleeve 42 have an extension ring 44 formed at the end away from the mating point, which is connected to the insulating tape 5. One end of the insulating tape 5 is wrapped around the outside of the extension ring 44. The extension ring 44 and the stripped portion of the insulating layer 32 provide each other with a wrapping bridge for the insulating tape 5, which can form a sealed environment outside the stripped core 31 to ensure insulation stability.

[0056] Furthermore, the outer pressure sleeve 41 and the inner pressure sleeve 42 are both formed with second connecting ribs 43 on their exteriors, and the outer sheath 34 is formed with first connecting ribs 341 on its exterior. The second heat shrink sleeve 8 is tightened around the second connecting ribs 43 and the first connecting ribs 341. The first connecting ribs 341 and the second connecting ribs 43 function similarly to an anchoring structure. When the second heat shrink sleeve 8 is heated and shrunk, its inner wall will be tightly embedded in the grooves between these connecting ribs, forming a labyrinthine sealing path and a strong axial anti-slip capability. This ensures that the second heat shrink sleeve 8 will not undergo axial displacement or retraction under long-term use or temperature changes, thereby ensuring the long-term stability and reliability of the connection and seal between the clamping device 4 and the outer sheath 34.

[0057] The present invention also provides a method for connecting cross-linked polyethylene insulated power cables, according to the above-described connector, comprising the following steps:

[0058] S1. The insulation layer 32, armor layer 33, and outer sheath 34 are peeled off in a stepped manner. The first connecting rib 341 is circumferentially cut near the peeled armor layer 33 on the outside of the outer sheath 34, and the exposed part of the wire core 31 is untwisted. At the same time, the same operation is performed on the other cable body 3. The purpose of this step is to avoid stress concentration in the same cross section through stepped peeling. The untwisting operation restores the wire core 31 to a natural loose state, eliminates internal torsional stress, and facilitates the subsequent insertion of the connecting conductor 2. At the same time, the circumferentially cut first connecting rib 341 provides a structural basis for the subsequent sealing and anchoring of the second heat shrink sleeve 8.

[0059] S2. On one cable body 3, the first heat shrink sleeve 7, the second heat shrink sleeve 8, the third heat shrink sleeve 9 and the outer pressure sleeve 41 are sequentially fitted on the outside, and the sealing ring 45 is pressed into the outer pressure sleeve 41. On the other cable body 3, the first heat shrink sleeve 7, the second heat shrink sleeve 8 and the inner pressure sleeve 42 are sequentially fitted on the outside. This step is to pre-fit all protective sleeves and clamping device assemblies in a logical order from the inside to the outside and from the middle to both ends. This ensures that the subsequent connection operations can be shrunk and tightened in sequence, avoiding rework due to omissions. It is the key to ensuring a smooth process flow.

[0060] S3. Insert the wire cores 31 on the two cable bodies 3 into the connecting conductor 2 from both ends and abut against the end face of the positioning table 211; this step achieves precise control of the insertion depth of the wire cores 31 through the positioning table 211, ensuring that the end faces of the two wire cores are accurately aligned inside the connecting conductor 2, forming the optimal electrical contact state, and avoiding connection failure caused by incomplete or excessive insertion.

[0061] S4. Apply glue to the external thread of the inner pressure sleeve 42 and tighten it with the outer pressure sleeve 41. The beveled surfaces of the outer pressure sleeve 41 and the inner pressure sleeve 42 are pressed against the beveled surfaces between the connecting post 11 and the pressure block 12, which radially tightens the pressure block 12 and the pressure plate 22. Finally, the second opening 221 forms an indentation on the outside of the wire core 31 and is embedded inside. The pressure plate 22 is tightened and fits against the outer arc surface of the wire core 31. This step is the core link to reduce contact resistance. Through the mechanical force amplification principle of the spiral and the beveled surface, the rotational torque is converted into a uniform and powerful radial pressure, which makes the pressure plate 22 produce a plastic indentation and embed into the wire core 31, breaking through the surface oxide layer and forming a "cold welding" type of tight metal contact. At the same time, the glue application enhances the anti-loosening and sealing performance of the threaded connection.

[0062] S5. Insulating tape 5 is wrapped around the outside of the exposed wire core 31, and then the insulating tape 5 is continuously wrapped around the extension ring 44 and the peeled part of the insulation layer 32. Armor tape 6 is wrapped around the outside of the insulating tape 5 and continuously wrapped to the peeled part of the armor layer 33. The insulating tape 5 starts from the wire core 31 and connects to the extension ring 44 and the original insulation layer 32, completely repairing the insulation shield. The armor tape 6 connects the area of ​​the clamping device 4 and the original armor layer 33, restoring the mechanical strength and tensile strength of the joint. The two work together to solve the electrical and mechanical weakness problem caused by the structural interruption at the joint.

[0063] S6. The first heat shrink sleeve 7 slides to the outside of the armor strip 6, heats it, and finally tightens it to the outside of the armor strip 6; the second heat shrink sleeve 8 slides to the outside of the clamping device 4 and the outer sheath 34, corresponding to the second connecting rib 43 and the first connecting rib 341, heats it, and tightens it, and the second heat shrink sleeve 8 also covers the stroke of the first heat shrink sleeve 7; the third heat shrink sleeve 9 slides to the outside of the two second heat shrink sleeves 8 and heats and tightens it; in this embodiment, the first heat shrink sleeve 7 fixes and protects the inner armor strip 6 and the insulating strip 5; the second heat shrink sleeve 8 forms the main sealing layer by covering the end of the first heat shrink sleeve 7 and locking it with the first connecting rib 341 on the outer sheath 34 and the second connecting rib 43 on the clamping device 4; the third heat shrink sleeve 9 provides the final reinforced seal for the entire clamping device 4 area and the mating gap of the second heat shrink sleeve 8, ensuring that the connector as a whole has high waterproof, moisture-proof and mechanical damage resistance capabilities.

[0064] Furthermore, the armor belt 6 is made of fiberglass woven belt and impregnated with polyurethane resin or similar water-curing polymer compounds; when immersed in water, the material will quickly undergo a chemical reaction and solidify, forming a hard and tough protective shell. The solidified armor belt has excellent compressive and impact resistance, providing reliable mechanical protection; it is also easy to operate, requiring no special tools, and can be tightly wrapped around irregular shapes. After solidification, it is tightly bonded to the joint and is not easy to separate.

[0065] It is understood that the present invention adapts to wire cores of different diameters through movable pressure blocks and pressure plates, avoiding matching problems caused by small-range errors; insulating tape and armor tape are wrapped around the peeling point of the insulation layer and armor layer and connected to the extension ring, which, together with the first heat shrink sleeve, enhances the structural strength and sealing of the connection; then the first heat shrink sleeve, outer sheath and clamping device are connected by the second heat shrink sleeve, and a third heat shrink sleeve is added at the connection to further enhance the overall connection strength and sealing performance.

[0066] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cross-linked polyethylene insulated power cable connector for connecting two cable bodies (3), wherein the cable body (3) comprises, from the inside out, a conductor (31), an insulation layer (32), an armor layer (33), and an outer sheath (34), characterized in that, The insulating layer (32), armor layer (33), and outer sheath (34) peel off in a stepped manner during connection. The connector includes: Flexible joint (1), the flexible joint (1) is located at the connection of the two cable bodies (3); Connecting conductor (2), the connecting conductor (2) is a metal conductive component, used for electrical conduction of the wire core (31) in the two cable bodies (3), the number of connecting conductors (2) is the same as the number of wire cores (31) in a single cable body (3), the flexible joint (1) and the connecting conductor (2) are respectively formed with a pressure block (12) and a pressure plate (22) for adjusting the insertion diameter of the wire core (31). The clamping device (4) includes an outer pressure sleeve (41) and an inner pressure sleeve (42) that are spirally tightened along the axial direction. The adjustable pressure block (12) and pressure plate (22) are tightened by the spiral and the wire core (31) is radially pressed. The outer pressure sleeve (41) and the inner pressure sleeve (42) are also provided with a sealing ring (45) at the spiral pressing position. Insulating tape (5), at least partially wrapped around the peeled insulation layer (32) and the clamp (4) at both ends, and wrapped around the middle portion of the peeled part that is not inserted into the connecting conductor (2); Armor tape (6), which wraps around the outside of insulating tape (5) and is at least partially located outside the stripped armor layer (33); It also includes a first heat shrink sleeve (7), a second heat shrink sleeve (8), and a third heat shrink sleeve (9).

2. The cross-linked polyethylene insulated power cable connector according to claim 1, characterized in that: The first heat shrink sleeve (7) is tightened outside the armor tape (6) and forms a circular cover; the second heat shrink sleeve (8) is connected between the clamp (4) and the outer sheath (34) and forms a circular cover on the stripped portion of the cable body (3); the third heat shrink sleeve (9) is connected between the two second heat shrink sleeves (8) and forms a circular cover on the clamp (4).

3. The cross-linked polyethylene insulated power cable connector according to claim 1, characterized in that: The flexible connector (1) includes a connecting post (11) in the middle, and the pressure blocks (12) are respectively formed at both ends of the connecting post (11). Several pressure blocks (12) are provided at the same end, and a first opening (13) is formed between adjacent pressure blocks (12). At the same time, a connecting hole (14) for connecting conductor (2) is also formed between adjacent pressure blocks (12).

4. The cross-linked polyethylene insulated power cable connector according to claim 3, characterized in that: The connecting conductor (2) includes a connecting part (21) fixed in the connecting post (11), and the pressure plates (22) are respectively formed at both ends of the connecting part (21), and a second opening (23) is formed between the pressure plates (22) at the same end.

5. The cross-linked polyethylene insulated power cable connector according to claim 4, characterized in that: The inner side of the connecting part (21) is formed with a positioning platform (211), and the inner side of the pressing plate (22) is formed with a barb (221).

6. The cross-linked polyethylene insulated power cable connector according to claim 3, characterized in that: The diameter of the connecting column (11) is larger than the diameter of all the pressure blocks (12) on one side in the tightened state, and a chamfer is formed at the connection. The outer pressure sleeve (41) and the inner pressure sleeve (42) are both formed with corresponding chamfers that form radial pressure.

7. The cross-linked polyethylene insulated power cable connector according to claim 1, characterized in that: The outer pressure sleeve (41) and the inner pressure sleeve (42) have an extension ring (44) formed at the end away from the mating point, which is connected to the insulating strip (5). One end of the insulating strip (5) is wrapped around the outside of the extension ring (44).

8. The cross-linked polyethylene insulated power cable connector according to claim 1, characterized in that: The outer pressure sleeve (41) and the inner pressure sleeve (42) are both formed with a second connecting rib (43), and the outer sheath (34) is formed with a first connecting rib (341). The second heat shrink sleeve (8) is tightened around the second connecting rib (43) and the first connecting rib (341).

9. A method for connecting cross-linked polyethylene insulated power cables, using the connector according to claims 1-8, characterized in that, Includes the following steps: S1. Peel off the insulation layer (32), armor layer (33), and outer sheath (34) in a stepped manner. Cut the first connecting rib (341) around the outer sheath (34) near the peeled armor layer (33) and untwist the exposed wire core (31). At the same time, perform the same operation on the other cable body (3). S2. On one cable body (3), the first heat shrink sleeve (7), the second heat shrink sleeve (8), the third heat shrink sleeve (9) and the outer pressure sleeve (41) are sequentially fitted on the outside of the cable body (3), and the sealing ring (45) is pressed into the outer pressure sleeve (41). On the other cable body (3), the first heat shrink sleeve (7), the second heat shrink sleeve (8) and the inner pressure sleeve (42) are sequentially fitted on the outside of the cable body (3). S3. Insert the wire cores (31) on the two cable bodies (3) into the connecting conductor (2) from both ends and abut against the end face of the positioning platform (211); S4. Apply glue to the outer thread of the inner pressure sleeve (42) and tighten it with the outer pressure sleeve (41). The beveled surfaces of the outer pressure sleeve (41) and the inner pressure sleeve (42) are squeezed against the beveled surfaces between the connecting column (11) and the pressure block (12). The pressure block (12) and the pressure plate (22) are tightened radially. Finally, the barb (221) forms an indentation on the outside of the core (31) and is embedded inside. The pressure plate (22) is tightened and fits against the outer arc surface of the core (31). S5. Wrap insulation tape (5) around the outside of the exposed core (31), and then wrap the insulation tape (5) continuously around the extension ring (44) and the peeled portion of the insulation layer (32), and wrap armor tape (6) around the outside of the insulation tape (5) and continue to wrap it to the peeled portion of the armor layer (33); S6. The first heat shrink sleeve (7) slides to the outside of the armor belt (6), heats it and finally tightens it to the outside of the armor belt (6); the second heat shrink sleeve (8) slides to the outside of the clamp (4) and the outer sheath (34) and corresponds to the second connecting rib (43) and the first connecting rib (341), heats it and tightens it, and the second heat shrink sleeve (8) also covers the stroke of the first heat shrink sleeve (7); the third heat shrink sleeve (9) slides to the outside of the two second heat shrink sleeves (8) and heats and tightens it.

10. The method for connecting cross-linked polyethylene insulated power cables according to claim 9, characterized in that: The armor belt (6) is made of fiberglass woven belt.

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