A long-distance high-voltage cable grounding joint

Abstract

The present invention relates to the technical field of cable grounding, and discloses a long-distance high-voltage cable grounding joint. This solution only strips off the outer protective layer of the cable, and fits and connects the conductive sheet to the metal sheath inside the cable without cutting the cable or damaging the metal sheath inside the cable. The conductive sheet is then connected to the grounding wire through a lead-out portion, thereby grounding the metal sheath inside the cable and leading out the induced voltage generated on the metal sheath, which greatly reduces the induced voltage of the long-distance cable. While ensuring power transmission over the long-distance cable, the number of straight-through joints in the cable is reduced as much as possible, thereby improving the long-term stability and reliability of the cable. At the same time, a protective shell is wrapped around the outer periphery of the conductive sheet, the lead-out portion, and the metal sheath to prevent the conductive sheet, the metal sheath, and the lead-out portion from rusting, which affects their grounding performance.

Description

Technical Field

[0001] The present invention relates to the technical field of cable grounding, in particular to a long-distance high-voltage cable grounding joint. Background Art

[0002] When a high-voltage cable is in operation, an alternating current flows through the core, and an alternating magnetic field is generated around the alternating current, forming a magnetic flux that is interconnected with the cable loop, generating an induced voltage on the metal sheath of the cable. Excessive induced voltage will pose a threat to the construction workers and the normal operation of the cable. The induced voltage on the metal sheath of the cable will increase synchronously with the increase of the cable length. In engineering projects, segmented cables are usually used and the segmented cables are connected through straight-through connectors to achieve the laying of long-distance high-voltage cables. Each straight-through connector will have a corresponding grounding lead to lead the induced voltage on the metal sheath to the ground, so as to reduce the induced voltage on the metal sheath of the cable. However, this method results in a large number of straight-through connectors when laying long-distance cables. Straight-through connectors are often the weakest link in the cable, with poor sealing and prone to leakage accidents, which increases the safety risks of the cable and reduces the stability and reliability of the power supply. Summary of the Invention

[0003] The purpose of the present invention is to provide a long-distance high-voltage cable grounding joint, which is used to solve the problem in the prior art that a straight-through joint is used to ground the metal sheath of a segmented cable, resulting in reduced cable stability.

[0004] To achieve the above objectives, an embodiment of the present application provides a long-distance high-voltage cable grounding connector for grounding the metal sheath inside the cable, comprising:

[0005] The conductive sheet is bonded and connected to the outer surface of the metal sheath;

[0006] A lead portion having a first end and a second end opposite to each other, wherein the first end is connected to the conductive sheet;

[0007] A protective shell is sleeved on the outer circumference of the cable, and the inner wall of the protective shell is spaced apart from the metal sheath, so that the space between the protective shell and the metal sheath forms a sealed cavity, the metal sheath, the conductive sheet, and part of the lead-out portion are accommodated in the sealed cavity, and the second end extends outward from the sealed cavity for connection to the grounding wire.

[0008] In some embodiments of the present application, the long-distance high-voltage cable grounding connector has an X-direction extending along the length of the cable;

[0009] The protective shell includes a first cylindrical body and a second cylindrical body connected to each other, the first cylindrical body extending along the X-direction, and the second cylindrical body protruding outward from the first cylindrical body in a direction away from the cable; the length of the first cylindrical body along the X-direction is greater than the length of the metal sheath, and both ends of the first cylindrical body along the X-direction are sleeved on the outer peripheral wall of the cable, so that the space between the first cylindrical body and the metal sheath constitutes a first cavity;

[0010] The second cylinder has a second cavity for accommodating the lead-out portion, the first cavity is communicated with the second cavity, and the first cavity and the second cavity form the sealed cavity; the second end extends outward from the second cavity.

[0011] In some embodiments of the present application, the long-distance high-voltage cable grounding joint further includes a first tube body and two second tube bodies;

[0012] The first tube body includes an inner embedded section and two protruding sections. The inner embedded section is accommodated in the first cavity. The two protruding sections are respectively connected to the two ends of the inner embedded section. The protruding section extends outward from the first cavity. One end of the protruding section protruding outward from the first cavity is connected to the second tube body.

[0013] In some embodiments of the present application, the first tube body and the two second tube bodies constitute a ventilation member, and a plurality of the ventilation members are provided, and the plurality of the ventilation members are arranged at intervals around the central axis of the cable.

[0014] In some embodiments of the present application, the inner embedded segments are conductive, and the outer peripheral wall of each inner embedded segment is bonded and connected to the metal sheath;

[0015] The long-distance high-voltage cable grounding joint also includes an annular conductive member, and the axial direction of the annular conductive member extends along the X direction. The inner side wall of the annular conductive member is sleeved on the outer periphery of each of the inner embedded segments, and the annular conductive member is electrically connected to the conductive sheet.

[0016] In some embodiments of the present application, there are multiple annular conductive members, and the multiple annular conductive members are spaced apart along the X direction.

[0017] In some embodiments of the present application, the first cavity and the second cavity are filled with conductive colloid.

[0018] In some embodiments of the present application, the first cylinder includes a first half cylinder portion and a second half cylinder portion connected to each other;

[0019] The inner side walls of the first semi-cylinder and the second semi-cylinder at both ends along the X direction are both fitted and connected to the outer peripheral wall of the cable, so that the space between the first semi-cylinder, the second semi-cylinder and the metal sheath constitutes the first cavity;

[0020] The second cylinder is connected to the first semi-cylinder portion or the second semi-cylinder portion.

[0021] In some embodiments of the present application, a first concave cavity is respectively provided at both ends of the first semi-cylinder along the X-direction, and the first concave cavity has a first opening connected to the outside world on the side facing the cable; a second concave cavity is respectively provided at both ends of the second semi-cylinder along the X-direction, and the second concave cavity has a second opening connected to the outside world on the side facing the cable; in the X-direction, the first concave cavity and the second concave cavity are staggered with respect to the first cavity;

[0022] The first concave cavity and the second concave cavity have flexible members for sealing the first opening and the second opening; the first concave cavity and the second concave cavity are both communicated with the first cavity.

[0023] In some embodiments of the present application, the first semi-cylindrical portion corresponding to the first cavity has a first through hole, one end of the first through hole is connected to the first cavity, and the other end of the first through hole is connected to the first concave cavity;

[0024] A second through hole is defined in the second semi-cylindrical portion corresponding to the first cavity. One end of the second through hole is communicated with the first cavity, and the other end thereof is communicated with the second concave cavity.

[0025] Compared with the prior art, the beneficial effect of a long-distance high-voltage cable grounding joint in an embodiment of the present invention is that: this solution only strips off the outer protective layer of the cable without cutting the cable and damaging the metal sheath inside the cable, and fits the conductive sheet to the metal sheath inside the cable, and then connects it to the grounding wire through the lead-out part, thereby grounding the metal sheath inside the cable, and is used to lead out the induced voltage generated on the metal sheath, which greatly reduces the induced voltage of the long-distance cable; while ensuring the long-distance cable to transmit power, the number of straight-through connectors in the cable is reduced as much as possible, thereby improving the long-term stability and reliability of the cable; at the same time, a protective shell is wrapped around the outer periphery of the conductive sheet, the lead-out part, and the metal sheath to prevent the conductive sheet, the metal sheath and the lead-out part from getting damp or contacting with water, which affects their grounding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the installation structure of the long-distance high-voltage cable grounding joint of the present invention;

[0027] Figure 2 This is a schematic diagram of the connection relationship between the conductive sheet, lead-out portion, and metal sheath of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection relationship between the ventilation member, the annular conductive member, the conductive sheet, and the metal sheath of the present invention;

[0029] Figure 4 This is a schematic diagram of the conductive sheet and the metal sheath being separated from each other;

[0030] Figure 5 This is a schematic diagram of the coordination relationship between the conductive sheet, metal sheath, and protective shell of the present invention;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of the protective shell of the present invention;

[0032] Figure 7 This is a schematic structural diagram of the first half-cylinder portion of the present invention;

[0033] Figure 8 This is a schematic structural diagram of the second half cylinder portion of the present invention;

[0034] Figure 9 This is a schematic diagram of the front view of the long-distance high-voltage cable grounding joint installation structure of the present invention along the cable length extension direction;

[0035] Figure 10 This is a schematic diagram of the connection relationship between the conductive sheet and the lead portion of the present invention;

[0036] Figure 11 Schematic diagram of the structure of the annular conductive member of the present invention.

[0037] In the figure, 1, cable; 11, metal sheath; 12, outer protective layer;

[0038] 2. Conductive sheet; 21. Perforation;

[0039] 3. Lead-out portion; 31. First conductive portion; 32. Second conductive portion;

[0040] 4. Protective shell; 41. First cylinder; 411. First semi-cylinder; 4111. First concave cavity; 4112. First opening; 4113. First through hole; 412. Second semi-cylinder; 4121. Second concave cavity; 4122. Second opening; 4123. Second through hole; 42. Second cylinder; 421. Extension hole;

[0041] 5. Sealed cavity; 51. First cavity; 52. Second cavity;

[0042] 6. Flexible parts;

[0043] 7. Filling pipe; 8. Ventilation member; 81. First tube body; 811. Inline section; 812. Extended section; 82. Second tube body; 9. Annular conductive member, 91. First arc-shaped conductive member; 92. Second arc-shaped conductive member. DETAILED DESCRIPTION

[0044] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0045] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as blocking the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0046] like Figures 1 to 11 As shown, an embodiment of the present application proposes a long-distance high-voltage cable grounding connector for grounding the metal sheath 11 inside the cable 1, including a conductive sheet 2, a lead-out portion 3, and a protective shell 4; the conductive sheet 2 is fitted and connected to the outer surface of the metal sheath 11; the lead-out portion 3 has a first end and a second end that are relatively arranged, the first end is connected to the outer surface of the conductive sheet 2, and the second end extends outward from the sealed cavity 5 and is used to be connected to the grounding wire; the protective shell 4 is sleeved on the outer periphery of the cable 1, and the inner wall of the protective shell 4 is spaced apart from the metal sheath 11, so that the space between the protective shell 4 and the metal sheath 11 forms a sealed cavity 5, the metal sheath 11 and the conductive sheet 2 are both accommodated in the sealed cavity 5, and the lead-out portion 3 is at least partially accommodated in the sealed cavity 5.

[0047] When this embodiment is implemented, Figure 2As shown, at the appropriate position of the cable 1, a certain length of the outer protective layer 12 of the cable 1 is stripped off, and the metal sheath 11 inside the cable 1 is exposed, and then the conductive sheet 2 is fitted with the exposed metal sheath 11, and the connection between the conductive sheet 2 and the metal sheath 11 is achieved by welding. When welding, argon arc welding and intermittent cooling are adopted, that is, argon gas is used to isolate the air to prevent metal oxidation, and each welding is paused after a period of time, and the welding part is cooled to below 90°C with a hair dryer, and then welding is continued to avoid the high temperature generated during welding damaging the insulation of the cable 1. The conductive sheet 2 in this solution is adaptively shaped to the metal sheath 11. If the metal sheath 11 inside the cable 1 is in the shape of a corrugated tube, the conductive sheet 2 is also shaped like a corrugated tube. If the metal sheath 11 inside the cable 1 is in the shape of a round tube with a smooth surface, the conductive sheet 2 is also shaped like a round tube. This is to ensure that the conductive sheet 2 and the metal sheath 11 are well fitted. When the size of the conductive sheet 2 is constant, the contact area between the conductive sheet 2 and the metal sheath 11 is increased as much as possible to reduce the contact resistance between the two.

[0048] In this solution, the metal sheath 11 is in the shape of a corrugated tube as an example for explanation, and the conductive sheet 2 is also configured to be in the shape of a corrugated tube; Figure 2 、 Figure 3 、 Figure 10 As shown, the lead-out part 3 in this scheme includes a first conductive part 31 and a second conductive part 32, wherein a plurality of first conductive parts 31 are provided, the first conductive part 31 is in the shape of a round rod and a portion of the first conductive part 31 is embedded in the trough between two adjacent peaks of the conductive sheet 2, thereby increasing the contact area between the first conductive part 31 and the conductive sheet 2, and the other parts of the plurality of first conductive parts 31 are connected to the second conductive part 32; specifically, the plurality of first conductive parts 31 and the second conductive part 32 are connected by welding, and the second conductive part 32 extends outward from one end of the sealing cavity 5 to form the second end. The plurality of first conductive parts 31 and the second conductive part 32 can be welded in advance to form the lead-out part 3, and then the plurality of first conductive parts 31 and the conductive sheet 2 are welded and connected. After the connection between the lead-out part 3 and the conductive sheet 2 is completed, it is fitted and connected to the metal sheath 11.

[0049] like Figure 10 As shown, holes are punched on the conductive sheet 2 to form perforations 21. The perforations 21 can be multiple and are used to weld the conductive sheet 2 and the metal sheath 11. This can increase the welding area between the metal sheath 11 and the conductive sheet 2 and ensure connection stability.

[0050] After completing the connection between the conductive sheet 2 and the metal sheath 11, the protective shell 4 is placed on the position where the outer protective layer 12 on the cable 1 is peeled off. The inner wall of the protective shell 4 and the outer protective layer 12 on the cable 1 at both ends of the metal sheath 11 are fitted and connected, so that the space between the inner wall of the protective shell 4 and the metal sheath 11 forms a sealed cavity 5. Figure 5 As shown, the metal sheath 11 and the conductive sheet 2 are both contained in the sealed cavity 5, and at least part of the lead-out portion 3 is contained in the sealed cavity 5, providing a better sealing environment for the metal sheath 11, the conductive sheet 2, and the lead-out portion 3, thereby achieving waterproof and moisture-proof treatment of the metal sheath 11, the conductive sheet 2, and the lead-out portion 3, avoiding rusting of the above components and affecting their grounding performance. This solution only removes the outer protective layer 12 of the cable 1 without cutting the cable 1 and without damaging the metal sheath 11 inside the cable 1, and fits the conductive sheet 2 to the metal sheath 11 inside the cable 1, and then connects it to the ground wire through the lead-out portion 3, thereby achieving grounding of the metal sheath 11 inside the cable 1, and is used to lead out the induced voltage generated on the metal sheath 11, thereby significantly reducing the induced voltage of the long-distance cable 1; while ensuring that the long-distance cable 1 transmits power, the number of straight-through connectors in the cable 1 is reduced as much as possible, thereby improving the long-term stability and reliability of the cable 1.

[0051] In some embodiments of the present application, the long-distance high-voltage cable grounding joint has an X-direction extending along the length of the cable 1; Figure 1 As shown, the protective shell 4 includes a first cylinder 41 and a second cylinder 42 connected to each other. The first cylinder 41 extends along the X direction, and the second cylinder 42 protrudes outward from the first cylinder 41 in the direction away from the cable 1; the length of the first cylinder 41 along the X direction is greater than the length of the metal sheath 11, so as to completely wrap the exposed metal sheath 11; Figure 5As shown, both ends of the first cylinder 41 along the X direction are sleeved on the outer wall of the cable 1, that is, located on the outer protective layer 12 of the cable 1 at both ends of the metal sheath 11; the space between the first cylinder 41 and the metal sheath 11 constitutes a first cavity 51; the second cylinder 42 has a second cavity 52 connected to the first cavity 51, and the lead-out portion 3 is at least partially located in the second cavity 52; specifically, the first conductive portion 31 is completely located in the second cavity 52, and the second conductive portion 32 is at least partially located in the second cavity 52. ​​The second conductive portion 32 extends outward from the second cavity 52 to constitute a second end and is used to connect to the grounding wire; the first cavity 51 and the second cavity 52 constitute a sealed cavity 5. In this embodiment, the first cylinder 41 and the second cylinder 42 together provide an environment isolated from the outside world for the exposed metal sheath 11, the conductive sheet 2, and the lead-out portion 3, which can effectively block the erosion of water vapor from the outside environment and prevent the above-mentioned components from rusting, thereby improving the service life, working stability, and reliability of the long-distance high-voltage cable grounding joint. The first cylinder 41 and the second cylinder 42 in this solution can be made of plastic or other corrosion-resistant materials with high structural strength.

[0052] In some embodiments of the present application, Figure 1 、 Figure 3As shown, the long-distance high-voltage cable grounding connector also includes a first tube body 81 and two second tube bodies 82; the first tube body 81 includes an inner embedded section 811 and two protruding sections 812, the inner embedded section 811 is accommodated in the first cavity 51, and the two protruding sections 812 are respectively connected to the two ends of the inner embedded section 811, and the other end of the inner embedded section 811 extends outward from the first cavity 51, and the end of the inner embedded section 811 extending outward from the first cavity 51 is connected to the second tube body 82, the second tube body 82 can be extended along the X direction, and the inner embedded section 811 is extended along the X direction in the first cavity 51; in this embodiment, through the cooperation of the first tube body 81 and the two second tube bodies 82, the airflow in the external environment can flow through the second tube body 82, the first tube body 81, and the second tube body 82 in sequence, so that the heat inside the cable 1 corresponding to the protective shell 4 can be transferred and dissipated outward. When electricity is passed through the cable 1, the conductor resistance will be converted into heat. If the ventilation effect of the environment in which the cable 1 is located is poor, the temperature of the cable 1 will increase. In this embodiment, the airflow in the external environment can be introduced into the first tube body 81 by setting a matching first tube body 81 and a second tube body 82. The first tube body 81 is in the sealed cavity 5. When the airflow with a lower temperature flows through the first tube body 81, the heat in the sealed cavity 5 can be taken away to the outside, thereby effectively suppressing the increase in the internal temperature of the cable 1 and reducing the temperature fluctuation amplitude in the sealed cavity 5 as much as possible, thereby reducing the amplitude of thermal expansion of the internal material of the cable 1 caused by the temperature increase of the cable 1 body; the smaller the thermal expansion amplitude of the cable 1, the more conducive it is to the connection sealing between the protective shell 4 and the cable 1, because repeated thermal expansion will cause the connection sealing between the protective shell 4 and the outer protective layer 12 of the cable 1 to decrease, reducing the waterproof and moisture-proof effect of the protective shell 4.

[0053] In some embodiments of the present application, the first tube body 81 and the two second tube bodies 82 constitute a ventilation member 8, and the ventilation member 8 may be provided in plurality, and the plurality of ventilation members 8 are arranged at intervals around the central axis of the cable 1. Figure 3 、 Figure 9 As shown, the more ventilation members 8 are provided, the more conducive it is to suppressing the fluctuation amplitude of the temperature in the sealed cavity 5, thereby maintaining the temperature in the sealed cavity 5 within a relatively stable range as much as possible.

[0054] In some embodiments of the present application, the inner embedded section 811 is a conductor, specifically the inner embedded section 811 can be made of aluminum, the extended section 812 and the second tube body 82 can be made of insulating material, and the inner embedded section 811, the extended section 812 and the second tube body 82 can be connected by adhesive; Figure 3As shown, the outer wall of each inner segment 811 is in close contact with the outer wall of the metal sheath 11; the long-distance high-voltage cable grounding joint also includes an annular conductive member 9, which can be made of aluminum. The annular conductive member 9 is sleeved on the outer peripheral arm of each inner segment 811, and the annular conductive member 9 is in close contact with the outer wall of each inner segment 811, and the annular conductive member 9 is electrically connected to the conductive sheet 2. Specifically, as shown in FIG. Figure 3 As shown, each embedded segment 811 and the conductive sheet 2 are located on the inner side of the annular conductive member 9 and are fitted and connected to the inner wall of the annular conductive member 9. The inner wall of the annular conductive member 9 can be connected to the peak position of the conductive sheet 2. In this way, through the arrangement of the embedded segment 811 and the annular conductive member 9, the contact area between the metal sheath 11 and the conductive sheet 2 is further increased, and the contact resistance between the metal sheath 11 and the conductive sheet 2 can be further reduced.

[0055] The inner embedded segment 811 is a conductor. Due to the setting of the inner embedded segment 811 and the annular conductive member 9, the inner embedded segment 811 and the annular conductive member 9 are both made of aluminum material. Aluminum material has a high thermal conductivity coefficient, which can further improve the efficiency of heat transfer from the sealed cavity 5 to the first tube body 81, thereby improving the heat dissipation efficiency in the sealed cavity 5.

[0056] In some embodiments of the present application, Figure 3 As shown, there can be multiple annular conductive members 9, and the multiple annular conductive members 9 are arranged at intervals along the X direction. The more annular conductive members 9 are arranged, the more conducive it is to increase the contact area between the conductive sheet 2 and the metal sheath 11. Increasing the number of annular conductive members 9 can reduce the contact resistance between the conductive sheet 2 and the metal sheath 11, and at the same time, it is also more conducive to improving the efficiency of transferring heat in the sealed cavity 5 to the first tube body 81.

[0057] In some embodiments of the present application, as a further optimization and improvement, the first cavity 51 and the second cavity 52 are filled with a conductive colloid, that is, the conductive colloid is filled into the sealed cavity 5. The conductive colloid is an adhesive with conductive properties after curing or drying, mainly composed of a base resin and a conductive filler. Conductive particles, such as gold, silver, etc., are mixed in the traditional colloid to form a conductive colloid; the sealed cavity 5 is completely filled with the conductive colloid, and the air in the sealed cavity 5 is discharged. At the same time, the filled conductive colloid fills the metal The sheath 11, the conductive sheet 2, the first tube 81, the annular conductive member 9, and part of the lead-out portion 3 are completely wrapped, and the conductive colloid can isolate the conductive sheet 2, the metal sheath 11, the first tube 81, the annular conductive member 9, and part of the lead-out portion 3 from contact with the air, and can further reduce the probability of the metal sheath 11, the conductive sheet 2, the first tube 81, the annular conductive member 9, and the lead-out portion 3 contacting water vapor, thereby improving the waterproof and moisture-proof effects of the conductive sheet 2, the metal sheath 11, the first tube 81, the annular conductive member 9, and the lead-out portion 3.

[0058] In addition, since the conductive colloid has conductive properties, the electrical contact area between the metal sheath 11 and the conductive sheet 2 is further increased, which helps to reduce the contact resistance. Figure 1 As shown, a filling pipe 7 can be provided on the first cylinder 41, and the staff can pour the conductive colloid into the sealed cavity 5 composed of the first cavity 51 and the second cavity 52 through the filling pipe 7. The filling pipe 7 can be equipped with a sealing cover, which can be connected to the filling pipe 7 by threaded connection or clipping. The sealing cover can seal the filling pipe 7.

[0059] In some embodiments of the present application, Figure 1 As shown, the first cylinder 41 includes a first semi-cylinder portion 411 and a second semi-cylinder portion 412 extending along the X-direction; the first semi-cylinder portion 411 and the second semi-cylinder portion 412 are spliced ​​and connected to form the cylindrical first cylinder 41. Specifically, structural adhesive can be applied at the splice of the first semi-cylinder portion 411 and the second semi-cylinder portion 412 to fix the first semi-cylinder portion 411 and the second semi-cylinder portion 412 together by gluing. The structural adhesive can bond the two together on the one hand and seal the splice of the first semi-cylinder portion 411 and the second semi-cylinder portion 412 on the other hand; or the first semi-cylinder portion 411 and the second semi-cylinder portion 412 can be fixedly connected by tying them together with wire at their outer peripheries. In this case, a sealing strip needs to be provided at the splice of the first semi-cylinder portion 411 and the second semi-cylinder portion 412 to improve the sealing performance.

[0060] like Figure 5 As shown, the inner walls of the first semi-cylinder 411 and the second semi-cylinder 412 at both ends along the X direction are fitted and connected to the outer peripheral wall of the cable 1, and the outer peripheral wall of the cable 1 is also located at the outer protective layer 12 of the cable 1 at both ends of the metal sheath 11, so that the space between the first semi-cylinder 411 and the second semi-cylinder 412 and the metal sheath 11 constitutes a first cavity 51; the second cylinder 42 is connected to the first semi-cylinder 411 or the second semi-cylinder 412; specifically, the second cylinder 42 and the first semi-cylinder 411 or the second semi-cylinder 412 can be arranged as an integral whole or as a separate body, and the filling pipe 7 can be arranged on the first semi-cylinder 411 and / or the second semi-cylinder 412.

[0061] Note: In this solution, holes are provided on the first semi-cylinder portion 411 and the second semi-cylinder portion 412 for allowing the protruding section 812 to protrude outward from the sealed cavity 5, and a sealing ring can be provided between the protruding section 812 and the hole wall, and the sealing ring is used to improve the sealing performance; in specific implementation, the protruding section 812 is first inserted into the hole, and one end of the protruding section 812 is connected to the second tube body 82, and the other end is connected to the embedded section 811, and the protruding section 812 and the second tube body 82, as well as the protruding section 812 and the embedded section 811 can be connected by gluing, so that the ventilation member 8 composed of the first tube body 81 and the second tube body 82 is installed on the first semi-cylinder portion 411 and the second semi-cylinder portion 412 respectively; Figure 11 As shown, the annular conductive member 9 in this scheme includes a first arc-shaped conductive member 91 and a second arc-shaped conductive member 92. After the first ventilation member 8 and the first semi-cylinder portion 411 and the second semi-cylinder portion 412 are assembled, the first arc-shaped conductive member 91 is connected to a plurality of inner embedded segments 811 installed on one of the first semi-cylinder portion 411 and the second semi-cylinder portion 412, so that the first arc-shaped conductive member 91 is located on the side of the inner embedded segment 811 away from the cable 1, and the second arc-shaped conductive member 92 is connected to a plurality of inner embedded segments 811 on the other side, so that the second arc-shaped conductive member 92 is located on the side of the inner embedded segment 811 away from the cable 1; the arc lengths of the first arc-shaped conductive member 91 and the second arc-shaped conductive member 92 are both greater than the length of the semicircular arc, as shown in FIG. Figure 11 As shown, when the first semi-cylinder portion 411 and the second semi-cylinder portion 412 are sleeved on the outer protective layer 12 on the cable 1, the two ends of the first arc-shaped conductive member 91 and the second arc-shaped conductive member 92 can be pressed together, thereby achieving contact connection between the first arc-shaped conductive member 91 and the second arc-shaped conductive member 92, and the first arc-shaped conductive member 91 and the second arc-shaped conductive member 92 achieve the effects of electrical conduction and heat conduction.

[0062] In some embodiments of the present application, Figure 5 As shown, the first semi-cylinder portion 411 is provided with first concave cavities 4111 at both ends along the X direction. Figure 7 As shown, the first cavity 4111 has a first opening 4112 communicating with the outside on the side facing the cable 1; the second semi-cylinder portion 412 has a second cavity 4121 at both ends along the X direction. Figure 8 As shown, the second cavity 4121 has a second opening 4122 communicating with the outside on the side facing the cable 1; Figure 5 As shown, in the X direction, the first concave cavity 4111 and the second concave cavity 4121 are staggered with the first cavity 51, that is, the first concave cavity 4111 and the second concave cavity 4121 are arranged at the corresponding positions of the cable 1 at both ends of the first cavity 51 along the X direction; Figure 7 、 Figure 8As shown, the first cavity 4111 and the second cavity 4121 both have a flexible member 6 for sealing the first opening 4112 and the second opening 4122 . The flexible member 6 can be made of rubber. The first cavity 4111 and the second cavity 4121 are both connected to the first cavity 51 .

[0063] The surface of the outer protective layer 12 of the cable 1 is limited by manufacturing and processing factors, resulting in some uneven areas on its surface. The presence of such areas will cause gaps to form at the contact points between the inner sidewalls of the first semi-cylinder portion 411 and the second semi-cylinder portion 412 and the outer protective layer 12 of the cable 1. Figure 5 As shown, the staff first sleeves the first semi-cylinder portion 411 on the outer periphery of the cable 1, and then sleeves the second semi-cylinder portion 412 on the outer periphery of the cable 1, so that the first semi-cylinder portion 411 and the second semi-cylinder portion 412 are spliced ​​into a cylindrical first cylinder 41, and the first semi-cylinder portion 411 and the second semi-cylinder portion 412 are spliced ​​into one body, and then the first semi-cylinder portion 411 and the second semi-cylinder portion 412 are fixed by applying structural glue or using wire binding at the splicing position of the first semi-cylinder portion 411 and the second semi-cylinder portion 412; and then the conductive colloid is poured into the sealing cavity 5 through the filling pipe 7, and the conductive colloid entering the sealing cavity 5 will successively enter the first concave cavity 4111 and the second concave cavity 4121, and gradually fill the first cavity 4111 and the second cavity 4121. As the conductive colloid is filled, the flexible part 6 is squeezed by the conductive colloid in the first cavity 4111 and the second cavity 4121, and the flexible part 6 is deformed toward the cable 1, so that the flexible part 6 is tightly pressed against the outer protective layer 12 of the cable 1 under the squeezing force of the conductive colloid. Since the flexible part 6 has the elasticity of deformation, the gap between the contact part of the inner wall of the first semi-cylinder 411 and the second semi-cylinder 412 and the outer protective layer 12 of the cable 1 can be completely filled, thereby further improving the sealing effect of the sealing cavity 5. After the conductive colloid is cured, a stable sealing structure is formed.

[0064] In this solution, the first concave cavity 4111 and the second concave cavity 4121 are both arranged along the circumference of the first semi-cylinder portion 411 and the second semi-cylinder portion 412. The first concave cavity 4111 and the second concave cavity 4121 are both arc-shaped, and the larger the proportion of the first concave cavity 4111 and the second concave cavity 4121 occupied by the first semi-cylinder portion 411 and the second semi-cylinder portion 412, the better the sealing effect of the sealing cavity 5.

[0065] In some embodiments of the present application, Figure 5 、 Figure 6 、 Figure 7 、 Figure 8As shown, this embodiment provides a structure in which a first concave cavity 4111 and a second concave cavity 4121 are connected to the first cavity 51, specifically as follows: a first through hole 4113 is provided in the first semi-cylinder portion 411 corresponding to the first cavity 51, one end of the first through hole 4113 is connected to the first cavity 51, and the other end is connected to the first concave cavity 4111; a second through hole 4123 is provided in the second semi-cylinder portion 412 corresponding to the first cavity 51, one end of the second through hole 4123 is connected to the first cavity 51, and the other end is connected to the second concave cavity 4121. In this solution, a plurality of first through holes 4113 and a plurality of second through holes 4123 are provided, and the plurality of first through holes 4113 and second through holes 4123 are arranged at intervals along the circumference of the first semi-cylinder portion 411 and the second semi-cylinder portion 412; as shown in FIG. Figure 7 As shown, a cavity connected to the first concave cavity 4111 and multiple first through holes 4113 is provided in the first semi-cylinder portion 411, one ends of the multiple first through holes 4113 are connected to the first cavity 51, and the other ends of the multiple first through holes 4113 are connected to the first concave cavity 4111 through the above-mentioned cavity; a cavity connected to the second concave cavity 4121 and multiple second through holes 4123 is provided in the second semi-cylinder portion 412, one ends of the multiple second through holes 4123 are connected to the first cavity 51, and the other ends of the multiple second through holes 4123 are connected to the second concave cavity 4121 through the above-mentioned cavity.

[0066] When the staff pours conductive colloid into the sealing cavity 5 through the filling pipe 7, the conductive colloid will enter the corresponding first concave cavity 4111 through the multiple first through holes 4113, and enter the corresponding second concave cavity 4121 through the multiple second through holes 4123, so that the conductive colloid is filled in the first concave cavity 4111 and the second concave cavity 4121, and the flexible part 6 is deformed by squeezing the flexible part 6, and the flexible part 6 is tightly pressed against the outer protective layer 12 of the cable 1 under the squeezing action of the conductive colloid, thereby further improving the sealing effect of the sealing cavity 5; the first through holes 4113 and the second through holes 4123 in this scheme should be set as many as possible, so as to increase the connecting cross-section between the sealing cavity 5 and the first concave cavity 4111 and the second concave cavity 4121, so that the conductive colloid entering the sealing cavity 5 can easily enter the first concave cavity 4111 and the second concave cavity 4121 through the first through holes 4113 and the second through holes 4123.

[0067] In this solution, if the second cylinder 42 and the first semi-cylinder 411 or the second semi-cylinder 412 are arranged in an integral manner, then when the first semi-cylinder 411 or the second semi-cylinder 412 is installed, it is necessary to make the positions of the second cylinder 42 connected to the first semi-cylinder 411 or the second semi-cylinder 412 correspond to each other, and then move the first semi-cylinder 411 or the second semi-cylinder 412 toward the direction close to the cable 1, so that when the first semi-cylinder 411 or the second semi-cylinder 412 is sleeved on the outer protective layer 12 of the cable 1, the lead-out portion 3 also just enters the second cylinder 42; Figure 6 As shown, the end of the second cylinder 42 away from the cable 1 has an extension hole 421 for allowing the second conductive part 32 of the lead-out part 3 to extend outward from the second cavity 52, and a sealing ring is provided between the second conductive part 32 and the extension hole 421 to improve the sealing performance of the second cavity 52.

[0068] The working process of the present invention is as follows: first, at a suitable position on the cable 1, a certain length of the outer protective layer 12 is stripped off to expose the internal metal sheath 11, and then the conductive sheet 2 is fitted and connected to the metal sheath 11, wherein the conductive sheet 2 and the lead-out portion 3 are assembled in advance, and then the first half-cylinder 411 and the second half-cylinder 412 are successively sleeved on the cable 1, thereby wrapping the exposed metal sheath 11, the conductive sheet 2, and part of the lead-out portion 3 to provide an environment isolated from the outside world; then, a conductive colloid is poured into the sealed cavity 5 to seal the sealed cavity 5. The air is discharged and the conductive colloid is completely filled in the sealing cavity 5, so that the metal sheath 11, the conductive sheet 2, the first tube 81, the annular conductive part 9, and part of the lead-out part 3 are wrapped by the conductive colloid; while the conductive colloid is poured into the sealing cavity 5, the conductive colloid enters the first concave cavity 4111 and the second concave cavity 4121, squeezing the flexible part 6, causing the flexible part 6 to deform, thereby completely filling the gap between the first semi-cylinder part 411, the second semi-cylinder part 412 and the outer protective layer 12 of the cable 1, further improving the sealing effect of the sealing cavity 5.

[0069] In summary, an embodiment of the present invention provides a long-distance high-voltage cable grounding connector. This solution only strips off the outer protective layer 12 of the cable 1 without cutting the cable 1 and damaging the metal sheath 11 inside the cable 1, and fits the conductive sheet 2 with the metal sheath 11 inside the cable 1, and then connects it to the grounding wire through the lead-out portion 3, so as to achieve grounding of the metal sheath 11 inside the cable 1, and is used to lead out the induced voltage generated on the metal sheath 11, thereby greatly reducing the induced voltage of the long-distance cable 1; while ensuring that the long-distance cable 1 is transmitting power, the number of straight-through connectors in the cable 1 is reduced as much as possible, thereby improving the long-term use stability and reliability of the cable 1; at the same time, a protective shell 4 is wrapped around the outer periphery of the conductive sheet 2, the lead-out portion 3, and the metal sheath 11 to prevent the conductive sheet 2, the metal sheath 11 and the lead-out portion 3 from rusting, thereby affecting their grounding performance.

[0070] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A long-distance high-voltage cable grounding joint for grounding a metal sheath (11) inside a cable (1), characterized in that: include: The conductive sheet (2) is bonded and connected to the outer surface of the metal sheath (11); A lead-out portion (3) having a first end and a second end arranged opposite to each other, wherein the first end is connected to the conductive sheet (2); A protective shell (4) is sleeved on the outer periphery of the cable (1), and the inner wall of the protective shell (4) is spaced apart from the metal sheath (11), so that the space between the protective shell (4) and the metal sheath (11) forms a sealed cavity (5), the metal sheath (11), the conductive sheet (2), and part of the lead-out portion (3) are accommodated in the sealed cavity (5), and the second end extends outward from the sealed cavity (5) for connection to a ground wire; The metal sheath (11) is in the shape of a corrugated tube, the conductive sheet (2) is in the shape of a corrugated tube adapted to the shape of the metal sheath (11), the lead-out portion (3) comprises a first conductive portion (31) and a second conductive portion (32), a plurality of the first conductive portions (31) are provided, the first conductive portions (31) are in the shape of a round rod, and a portion of the first conductive portion (31) is embedded in a trough between two adjacent crests of the conductive sheet (2); The long-distance high-voltage cable grounding joint has an X-direction extending along the length direction of the cable (1); The protective shell (4) comprises a first cylinder (41) and a second cylinder (42) connected to each other, wherein the first cylinder (41) extends along the X direction, and the second cylinder (42) protrudes outward from the first cylinder (41) in a direction away from the cable (1); the length of the first cylinder (41) along the X direction is greater than the length of the metal sheath (11), and both ends of the first cylinder (41) along the X direction are sleeved on the outer peripheral wall of the cable (1), so that the space between the first cylinder (41) and the metal sheath (11) constitutes a first cavity (51); The second cylinder (42) has a second cavity (52) for accommodating the lead-out portion (3); the first cavity (51) is communicated with the second cavity (52), and the first cavity (51) and the second cavity (52) constitute the sealed cavity (5); the second end extends outward from the second cavity (52); The long-distance high-voltage cable grounding joint further includes a first tube body (81) and two second tube bodies (82); The first tube body (81) includes an inner embedded section (811) and two protruding sections (812), the inner embedded section (811) is accommodated in the first cavity (51), the two protruding sections (812) are respectively connected to the two ends of the inner embedded section (811), the protruding section (812) protrudes outward from the first cavity (51), and one end of the protruding section (812) protruding outward from the first cavity (51) is connected to the second tube body (82); the inner embedded section (811) extends along the X direction, and the second tube body (82) extends along the X direction, so that the airflow in the external environment can flow through one second tube body (82), the first tube body (81), and the other second tube body (82) in sequence; The inner embedded segments (811) are conductive bodies, and the outer peripheral walls of each inner embedded segment (811) are in close contact with the metal sheath (11); The first cavity (51) and the second cavity (52) are filled with conductive colloid.

2. The long-distance high-voltage cable grounding joint according to claim 1, characterized in that: The first tube body (81) and the two second tube bodies (82) constitute a ventilation member (8). A plurality of the ventilation members (8) are provided, and the plurality of ventilation members (8) are spaced apart and arranged around the central axis of the cable (1).

3. The long-distance high-voltage cable grounding joint according to claim 1, characterized in that: The long-distance high-voltage cable grounding joint further comprises an annular conductive member (9), wherein the axial direction of the annular conductive member (9) extends along the X direction, the inner side wall of the annular conductive member (9) is sleeved on the outer periphery of each of the inner embedded segments (811), and the annular conductive member (9) is electrically connected to the conductive sheet (2).

4. The long-distance high-voltage cable grounding joint according to claim 3, characterized in that: A plurality of the annular conductive members (9) are provided, and the plurality of the annular conductive members (9) are spaced apart along the X direction.

5. The long-distance high-voltage cable grounding joint according to claim 1, characterized in that: The first cylinder (41) comprises a first semi-cylinder portion (411) and a second semi-cylinder portion (412) connected to each other; The inner side walls of the first semi-cylinder (411) and the second semi-cylinder (412) at both ends along the X direction are fitted and connected to the outer peripheral wall of the cable (1), so that the space between the first semi-cylinder (411), the second semi-cylinder (412) and the metal sheath (11) forms the first cavity (51); The second cylinder (42) is connected to the first semi-cylinder portion (411) or the second semi-cylinder portion (412).

6. The long-distance high-voltage cable grounding joint according to claim 5, characterized in that: The first semi-cylinder (411) is provided with a first concave cavity (4111) at both ends along the X direction, and the first concave cavity (4111) has a first opening (4112) communicating with the outside world on the side facing the cable (1); the second semi-cylinder (412) is provided with a second concave cavity (4121) at both ends along the X direction, and the second concave cavity (4121) has a second opening (4122) communicating with the outside world on the side facing the cable (1); in the X direction, the first concave cavity (4111) and the second concave cavity (4121) are both staggered with the first cavity (51); The first concave cavity (4111) and the second concave cavity (4121) have flexible parts (6) for sealing the first opening (4112) and the second opening (4122); the first concave cavity (4111) and the second concave cavity (4121) are both connected to the first cavity (51).

7. The long-distance high-voltage cable grounding joint according to claim 6, characterized in that: The first semi-cylinder portion (411) corresponding to the first cavity (51) has a first through hole (4113) therein, one end of the first through hole (4113) is in communication with the first cavity (51), and the other end is in communication with the first concave cavity (4111); A second through hole (4123) is provided in the second semi-cylindrical portion (412) corresponding to the first cavity (51), and one end of the second through hole (4123) is connected to the first cavity (51), and the other end is connected to the second concave cavity (4121).

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