An insulating joint

Abstract

This invention provides an insulating joint for connecting a first cable body and a second cable body, comprising: a prefabricated joint made of insulating material, fitted onto the prefabricated insulation layer of the first cable body and / or the second cable body; a semi-conductive tape wrapped around the first and second cable bodies and extending to the metal sheath, the semi-conductive tape being disconnected at the prefabricated joint; a copper mesh wrapped around the circumference of the semi-conductive tape and extending to the metal sheath, the copper mesh being disconnected at the prefabricated joint; and an insulating tape wrapped around the circumference of the copper mesh and fully wrapped around the prefabricated joint. The prefabricated joint and its wrapped copper mesh and semi-conductive tape in this invention separate the metal sheaths of the first and second cable bodies, preventing them from becoming conductive. The semi-conductive tape and copper mesh are both disconnected at the prefabricated joint, avoiding conductivity between the two metal sheath sections. This insulating joint has good insulation properties while also having a simple structure and simple manufacturing process.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, and more specifically to an insulating connector. Background Technology

[0002] High-voltage cables are mostly single-core cable systems. The metal sheath has an induced voltage that increases with the length of the cable. The cumulative effect can endanger personal safety, especially when a short circuit fault, lightning strike, or operational overvoltage occurs, which may break down the outer sheath. In addition, if the two ends of the cable shield are directly grounded, a large circulating current loss will be generated, causing the cable to heat up, reducing the current carrying capacity, and accelerating the thermal aging of the cable.

[0003] When a single-core high-voltage cable is long, an insulating joint is required to electrically disconnect the metal sheath and insulation shield of the cable at both ends. Currently, the disconnection point of the high-voltage cable is connected by a fusion splice, which requires adding a semi-conductive portion at a specific location before fusing the insulation. This is technically challenging, requiring the design of relevant semi-conductive molds and placing high demands on the installer's skills and the insulation welding materials used. Problems such as incomplete welding and interface delamination may occur. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of high manufacturing process requirements and incomplete welding of the insulation joint at the break of high voltage cable in the prior art, so as to provide an insulation joint with a simple manufacturing process.

[0005] To solve the above-mentioned technical problems, the present invention provides an insulating joint, comprising:

[0006] The prefabricated joint, made of insulating material, is sleeved on the prefabricated insulation layer of the first cable body and / or the second cable body;

[0007] A semi-conductive strip is wrapped around the first cable body and the second cable body and extends to the metal sheath, the semi-conductive strip being broken at the prefabricated joint;

[0008] A copper mesh is wrapped around the circumference of the semiconductive strip and extends to the metal sheath, the copper mesh being broken at the prefabricated joint;

[0009] Insulating tape is wrapped around the circumference of the copper mesh and then fully wrapped around the prefabricated joint.

[0010] As a preferred embodiment, the ends of the first cable body and the second cable body are stripped to expose part of the conductor, and the two sections of the conductor are welded together to form a fusion joint.

[0011] As a preferred embodiment, the fusion joint has a fusion conductor shielding layer, a fusion insulation layer, and a fusion insulation shielding layer that are concentrically arranged from the inside to the outside.

[0012] As a preferred embodiment, the fusion splice and the prefabricated joint are spaced apart, and the prefabricated joint is sleeved on the insulation layer of the first cable body or the insulation layer of the second cable body.

[0013] As a preferred embodiment, the ends of the first cable body and the second cable body are stripped to expose a portion of the conductor, and the ends of the two conductor sections abut against each other, further comprising:

[0014] A connecting tube is sleeved on two opposing conductors, and the connecting tube and the conductors are crimped together.

[0015] Semiconducting tape is wrapped around the connecting tube, with both ends extending to abut against the insulation layers of the first cable body and the second cable body;

[0016] A shielding tile is fitted onto a semi-conductive tape (24) wrapped around the circumference of the connecting pipe. The outer diameter of the shielding tile is equal to the outer diameter of the insulation layer of the second cable body. The prefabricated joint is fitted onto the shielding tile.

[0017] As a preferred embodiment, the material of the connecting tube is the same as the material of the conductor.

[0018] As a preferred option, it also includes:

[0019] An insulating copper shell is fitted around the circumference of the insulating strip and extends to the metal sheath of the first cable body and the second cable body. The insulating copper shell and the metal sheath are waterproofed.

[0020] Waterproof sealant is injected into the gap between the insulating copper shell and the insulating strip.

[0021] As a preferred option, it also includes:

[0022] An insulating cylinder is concentrically fitted inside the insulating copper shell, and the insulating cylinder is spaced out and fitted around the prefabricated joint in the circumferential direction.

[0023] The technical solution of this invention has the following advantages:

[0024] 1. The insulating joint provided by this invention comprises a prefabricated joint made of insulating material, separating the metal sheaths of the first cable body and the second cable body into two non-conductive sections; a semi-conductive tape and a copper mesh are wrapped around the two cable bodies to enhance the connection strength; wherein, the semi-conductive tape and the copper mesh are both disconnected at the prefabricated joint to prevent the two metal sheath sections from becoming conductive; the insulating tape is wrapped around the circumference of the copper mesh to enhance the insulation performance of the outer layer of the cable body and prevent breakdown due to faults. The above-mentioned insulating joint has good insulation performance, a simple structure, and a simple manufacturing process.

[0025] 2. The insulating joint provided by the present invention connects the cable break point through a fusion splice, ensuring the connection strength and conductivity of the conductor.

[0026] 3. The insulating joint provided by the present invention has a first cable body and a second cable body corresponding at the conductor ends and crimped together with a connecting tube, which is convenient to operate; at the same time, the prefabricated joint is sleeved at the conductor break point, which increases the connection strength at the break point.

[0027] 4. The insulating connector provided by the present invention has the same material for the connecting tube and the conductor, thus ensuring the original conductivity of the conductor.

[0028] 5. The insulating joint provided by the present invention increases the strength of the connection between the two cable bodies by the insulating copper shell, and the use of waterproof sealant increases the waterproof performance of the connection between the cable bodies.

[0029] 6. The insulating joint provided by the present invention provides an additional insulating effect through the insulating cylinder. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the insulating joint provided in the first embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the fusion joint in the first embodiment.

[0033] Figure 3 This is a schematic diagram showing the relationship between the prefabricated joint and the cable body in the first embodiment.

[0034] Figure 4 This is a schematic diagram showing the assembly relationship between the insulating copper shell and the cable body.

[0035] Figure 5 This is a schematic diagram of the insulating joint provided in the second embodiment of the present invention.

[0036] Figure 6 This is an enlarged view of region A in the diagram.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Prefabricated joint; 2. Semi-conductive tape; 3. Copper mesh; 4. Insulating copper shell; 5. Insulating cylinder; 6. First cable body; 7. Second cable body; 8. Outer sheath; 9. Metal sheath; 10. First insulating conical head; 11. First conductor; 12. Second insulating conical head; 13. Second conductor; 14. Welding point; 15. Welded conductor shielding layer; 16. Welded insulation layer; 17. Welded insulation shielding layer; 18. Prefabricated insulation layer; 19. Waterproof insulating tape; 20. Insulating self-adhesive tape; 21. PVC tape; 22. Waterproof sealant; 23. Connecting pipe; 24. Semi-conductive tape; 25. Shielding tile. Detailed Implementation

[0039] 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.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example 1

[0044] The insulating joint provided in this embodiment includes: a prefabricated joint 1, a semi-conductive strip 2, a copper mesh 3, an insulating strip, an insulating copper shell 4, and an insulating cylinder 5.

[0045] like Figure 1 , Figure 2 As shown, the first cable body 6 and the second cable body 7 are arranged opposite each other. The ends of the first cable body 6 and the second cable body 7 are stripped. Near the break point, the outer sheath 8, metal sheath 9, water-blocking layer, and insulating shielding layer of the first cable body 6 are stripped in sequence, and then shaped into a first insulating cone head 10, exposing the first conductor 11. Near the break point, the outer sheath 8, metal sheath 9, water-blocking layer, and insulating shielding layer of the second cable body 7 are stripped in sequence, and then shaped into a second insulating cone head 12, exposing the second conductor 13. The first conductor 11 and the second conductor 13 are welded together, forming a welding point 14. A fusion-welded conductor shielding layer 15 is wrapped around the first conductor 11. The first conductor 11 and the second conductor 13 are used to restore the semiconducting shielding layer on the second conductor 13 and the welding point 14; the fusion insulation layer 16 wraps around the circumference of the fusion conductor shielding layer 15 and extends to the first insulating cone head 10 and the second insulating cone head 12 to restore the insulation layer at the connection between the first cable body 6 and the second cable body 7; the fusion insulation shielding layer 17 wraps around the circumference of the fusion insulation layer 16 to restore the insulation shielding layer at the connection between the first cable body 6 and the second cable body 7; wherein, the first conductor 11, the second conductor 13, the fusion conductor shielding layer 15, the fusion insulation layer 16 and the fusion insulation shielding layer 17 together constitute a fusion joint.

[0046] like Figure 3 As shown, the prefabricated connector 1 is sleeved on the second cable body 7 and spaced apart from the fusion joint; the portion of the second cable body 7 near the metal sheath is stripped to remove the water-blocking layer and the insulating shielding layer, exposing the prefabricated insulation layer 18; the prefabricated connector 1 is made of rubber and is sleeved on the prefabricated insulation layer 18; the two ends of the prefabricated connector 1 have annular steps, and the annular steps are wrapped with waterproof insulating tape 19 and formed into a conical surface to facilitate the subsequent wrapping of the semiconducting tape 2, copper mesh 3 and insulating tape.

[0047] like Figure 2 , Figure 3As shown, the first cable body 6 and the second cable body 7 are wrapped with a semi-conductive tape 2, a copper mesh 3, and an insulating tape. The insulating tape includes an insulating self-adhesive tape 20 and a PVC tape 21 wound sequentially from the inside out. The semi-conductive tape 2 is divided into two sections for winding. The left half is wound from the metal sheath 9 of the first cable body 6 through the fusion joint to the left end of the prefabricated joint 1, and the right half is wound from the metal sheath 9 of the second cable body 7 to the right end of the prefabricated joint 1. There is a gap between the left half and the right half. The copper mesh 3 is wrapped around the semi-conductive tape 2 in the circumferential direction and is broken at the prefabricated joint 1. The insulating self-adhesive tape 20 is wound from the metal sheath 9 of the first cable body 6 to the metal sheath 9 of the first cable body 6, and the PVC tape 21 is wound around the insulating self-adhesive tape 20.

[0048] like Figure 4 As shown, an insulating copper shell 4 is spaced out on the outer side of the PVC tape 21. Both ends of the insulating copper shell 4 are connected to the metal sheath 9. The insulating copper shell 4 and the metal sheath 9 are waterproofed. An insulating cylinder 5 is installed inside the insulating copper shell 4. The insulating cylinder 5 is spaced out on the circumference of the prefabricated joint 1. There is a gap between the insulating copper shell 4 and the PVC tape 21. The gap is filled with waterproof sealant 22.

[0049] Example 2

[0050] The insulating joint provided in this embodiment includes: a prefabricated joint 1, a semiconductive strip 2, a copper mesh 3, an insulating strip, an insulating copper shell 4, and an insulating cylinder 5; wherein the connection method between the first conductor 11 and the second conductor 13 and the connection position of the prefabricated joint 1 are different from those in embodiment 1, while the other structures are completely consistent with those in embodiment 1.

[0051] like Figure 5 , Figure 6As shown, at one end of the first cable body 6 near the break point, the outer sheath 8, metal sheath 9, water-blocking layer, and insulating shielding layer are stripped in sequence, and part of the insulation layer is removed to expose the first conductor 11; at one end of the second cable body 7 near the break point, the outer sheath 8, metal sheath 9, water-blocking layer, and insulating shielding layer are stripped in sequence, and part of the insulation layer is removed to expose the second conductor 13; the ends of the first conductor 11 and the second conductor 13 are abutted against each other, and a connecting tube 23 is simultaneously sleeved on the first conductor 11 and the second conductor 13, the material of the connecting tube 23 being the same as the material of the conductors. Similarly; the connecting tube 23 is crimped to the conductor; a semi-conductive tape 24 is wrapped around the circumference of the connecting tube 23, and the two ends of the semi-conductive tape 24 extend to abut against the insulation layer of the first cable body 6 and the second cable body 7, so as to restore the semi-conductive shielding layer of the first conductor 11 and the second conductor 13; a shielding tile 25 is fitted around the circumference of the semi-conductive tape 24 wrapped around the connecting tube 23, and the shielding tile 25 is used to restore the insulation layer of the first cable body 6 and the second cable body 7, and the prefabricated joint 1 is fitted on the shielding tile 25.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An insulating joint for connecting a first cable body (6) and a second cable body (7), characterized in that, include: The ends of the first cable body (6) and the second cable body (7) are stripped to expose part of the conductor, and the two sections of the conductor are welded together to form a fusion joint; The ends of the first cable body (6) and the second cable body (7) are covered with metal sheaths (9); the portions of the first cable body (6) and / or the second cable body (7) near the metal sheaths (9) are stripped to expose a pre-insulated layer (18), which is located between the fusion joint and the metal sheaths (9). The prefabricated joint (1) is made of insulating material and is sleeved on the prefabricated insulation layer (18) of the first cable body (6) and / or the second cable body (7); A semi-conductive strip (2) is wrapped around the first cable body (6) and the second cable body (7) and extends to the metal sheath (9). The semi-conductive strip (2) is broken at the prefabricated joint (1). The semiconductive strip (2) includes a left half and a right half. The left half is wound from the metal sheath (9) of the first cable body (6) to the left end of the prefabricated joint (1), and the right half is wound from the metal sheath (9) of the second cable body (7) to the right end of the prefabricated joint (1). One of the left half and the right half passes through the fusion joint, and there is a gap between the left half and the right half. A copper mesh (3) is wrapped around the circumference of the semiconductive strip (2) and extends to the metal sheath (9), the copper mesh (3) being broken at the prefabricated joint (1); Insulating tape is wrapped around the circumference of the copper mesh (3) and is fully wrapped around the prefabricated joint (1).

2. The insulating joint according to claim 1, characterized in that, The fusion joint has a fusion conductor shielding layer (15), a fusion insulation layer (16), and a fusion insulation shielding layer (17) arranged concentrically from the inside to the outside.

3. The insulating joint according to claim 1, characterized in that, The fusion joint and the prefabricated joint (1) are spaced apart, and the prefabricated joint (1) is sleeved on the insulation layer of the first cable body (6) or the insulation layer of the second cable body (7).

4. The insulating joint according to claim 1, characterized in that, The ends of the first cable body (6) and the second cable body (7) are stripped to expose part of the conductor, and the ends of the two conductors abut against each other, and the cable body further includes: A connecting tube (23) is sleeved on two sections of the conductor that abut against each other, and the connecting tube (23) and the conductor are crimped together. A semi-conductive tape (24) is wrapped around the connecting tube (23), with both ends extending to abut against the insulation layers of the first cable body (6) and the second cable body (7); The shielding tile (25) is fitted onto the semi-conductive tape (24) wrapped around the connecting pipe (23). The outer diameter of the shielding tile (25) is equal to the outer diameter of the insulation layer of the second cable body (7). The prefabricated joint (1) is fitted onto the shielding tile (25).

5. The insulating joint according to claim 4, characterized in that, The material of the connecting tube (23) is the same as that of the conductor.

6. The insulating joint according to any one of claims 1-5, characterized in that, Also includes: An insulating copper shell (4) is fitted around the insulating strip and extends to the metal sheath (9) of the first cable body (6) and the second cable body (7). The insulating copper shell (4) and the metal sheath (9) are waterproofed. Waterproof sealant (22) is injected into the gap between the insulating copper shell (4) and the insulating strip.

7. The insulating joint according to claim 6, characterized in that, Also includes: An insulating cylinder (5) is concentrically fitted inside the insulating copper shell (4), and the insulating cylinder (5) is spaced out and fitted around the prefabricated joint (1) in the circumferential direction.

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