A medium and low pressure water blocking type intermediate joint installation process

Abstract

The present invention discloses a medium and low pressure water-blocking type intermediate joint installation process, by setting the end of the wire core insulation layer as a step structure and using the first water-blocking structure to seal the step structure and the connecting pipe, the wire core can be effectively guaranteed to be waterproof, and then the two sides of the joint body are sealed by setting the second water-blocking structure, so as to ensure the waterproofness of the joint body, and then the shielding layer and the armor layer are waterproofed by setting an external waterproof sealing layer, and finally an intermediate joint with a multi-layer water-blocking structure is obtained; at the same time, the mesh sleeve can fix multiple joint bodies, and the fixing operation is simple and the effect is excellent; in addition, the armor tape and the copper mesh shielding recovery layer are used to restore the armor layer and the shielding layer. The present invention uses a multi-layer waterproof method to carry out waterproof treatment, which greatly improves the waterproof ability of the intermediate joint, and while ensuring the waterproof ability, it will not damage the original performance of the cable.

Description

Technical Field

[0001] The invention relates to the field of intermediate joints, and in particular to an installation process for medium- and low-pressure water-blocking intermediate joints. Background Art

[0002] Due to its own structural characteristics, conventional intermediate joints cannot prevent water or moisture from penetrating from the outside of the joint to the inside of the joint. Water vapor can penetrate from one end of the joint to the other end of the joint, and the overall waterproof performance is poor. After the cable is flooded, the moisture will directly contact the cable core, corrode the copper shielding layer, change the electric field inside the cable, accelerate the aging of the cable, and eventually cause the main insulation of the cable to break down; in addition, the moisture will spread along the cable body to other electrical equipment, causing damage to other electrical equipment. It cannot be used in occasions with high requirements for waterproof performance. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a medium-low pressure water-blocking type intermediate joint installation process, which can solve the problem of weak waterproof performance of traditional intermediate joints.

[0004] The installation process of the medium and low pressure water blocking type intermediate joint according to the embodiment of the present invention comprises:

[0005] Use multiple connecting tubes to connect multiple wire cores of the cables on both sides, and the wire core insulation layer of the cables is prefabricated into a stepped structure;

[0006] A first water-blocking structure is provided on the step structure and the connecting pipe to seal the step structure and the connecting pipe;

[0007] A plurality of joint bodies are sleeved on the plurality of connecting pipes one by one to surround the first water-blocking structure, and the joint bodies are pre-sleeved on each core wire of the cable;

[0008] A second water-blocking structure is provided at both ends of each joint body to achieve sealing at both ends of each joint body;

[0009] Constructing a copper mesh shielding restoration layer outside each of the connector bodies and the corresponding second water-blocking structure, and connecting two ends of the copper mesh shielding restoration layer to the shielding layers of the core wires on both sides one by one;

[0010] A third water-blocking structure is provided at the bifurcation of the plurality of core wires of the cable;

[0011] Bringing together a plurality of the connector bodies to form a connection body, arranging an armor tape on the connection body, and connecting the two ends of the armor tape to the armor layers of the cables on both sides one by one;

[0012] Sleeve the mesh sleeves pre-sleeved on the cables on both sides onto the connecting body, wherein the mesh sleeves on each side of the cables extend from the outer sheath layer of the cables to the connector body, and there is an overlapping area between the two mesh sleeves;

[0013] An external waterproof sealing layer is arranged on the mesh sleeve to seal the connection body.

[0014] The installation process of the medium and low pressure water blocking type intermediate joint according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The installation process of the medium and low pressure water-blocking intermediate joint of the embodiment of the present invention can effectively ensure the waterproofness of the wire core by setting the end of the wire core insulation layer as a step structure and using the first water-blocking structure to seal the step structure and the connecting pipe, and then the second water-blocking structure is set to seal the two sides of the joint body, so as to ensure the waterproofness of the joint body. After that, the shielding layer and the armor layer are waterproofed by setting an external waterproof sealing layer, and finally an intermediate joint with a multi-layer water-blocking structure is obtained; at the same time, the embodiment of the present invention adopts a mesh sleeve to fix multiple joint bodies, and the fixing operation is simple and the effect is excellent; in addition, the installation process of the medium and low pressure water-blocking intermediate joint of the embodiment of the present invention also uses armor tape and copper mesh shielding recovery layer to restore the armor layer and the shielding layer, ensuring the integrity of the cable performance. The installation process of the medium and low pressure water-blocking intermediate joint of the embodiment of the present invention uses a multi-layer waterproof method for waterproofing, which greatly improves the waterproof ability of the intermediate joint, and while ensuring the waterproof ability, it will not damage the original performance of the cable, and is suitable for industrial promotion.

[0016] According to some embodiments of the present invention, the first water-blocking structure includes a first sealant and a first semi-conductive tape;

[0017] The first water blocking structure is arranged by the following steps:

[0018] Wrap the first sealant between the two ends of the connecting pipe and the stepped structures on both sides to fill the gaps between the two ends of the connecting pipe and the stepped structures on both sides, and part of the sealant in the first sealant overlaps the connecting pipe and covers the stepped structures;

[0019] A first semi-conductive tape is wrapped between the wire core insulation layers on both sides to wrap the first sealant and the connecting tube.

[0020] According to some embodiments of the present invention, the second water-blocking structure includes a second sealant, a first waterproof tape, and a second semi-conductive tape;

[0021] The second water blocking structure is arranged by the following steps:

[0022] Using a second sealant to wrap the two ends of the connector body and the shielding layer adjacent to the two ends of the connector body, and a portion of the second sealant overlaps the shielding layer and the connector body;

[0023] Wrapping multiple layers of the first waterproof tape on the second sealant, and the first waterproof tape needs to cover the second sealant, so that a conical transition shape is formed at the end step of the joint body;

[0024] The first waterproof tape is wrapped with a second semi-conductive tape to form a package around the first waterproof bag.

[0025] According to some embodiments of the present invention, the copper mesh shielding restoration layer includes a shielding restoration copper mesh, a first fixing structure;

[0026] The copper mesh shielding recovery layer is arranged by the following steps:

[0027] Wrap the shielding restoration copper mesh around the connector body to form a wrap around the connector body, and overlap the two ends of the shielding restoration copper mesh on the shielding layers of the cables on both sides;

[0028] The shielding restoration copper mesh is fixed on the shielding layer by using the first fixing structure.

[0029] According to some embodiments of the present invention, the copper mesh shielding restoration layer includes a shielding restoration copper mesh, a first fixing structure and a first copper braided belt; the shielding restoration copper mesh includes a plurality of set copper meshes;

[0030] The copper mesh shielding recovery layer is arranged by the following steps:

[0031] Sequentially sheathing a plurality of the sheathed copper meshes on the connector body to form a multi-layer sheathed structure and wrap the connector body, with the two ends of the sheathed copper meshes overlapping the shielding layers of the cables on both sides;

[0032] The first copper braid is arranged along the connector body, and two ends of the first copper braid are overlapped on the shielding layer of the cable;

[0033] The two ends of the shielding restoration copper mesh and the two ends of the first copper braided belt are simultaneously fixed on the shielding layer by using the first fixing structure.

[0034] According to some embodiments of the present invention, the first fixing structure includes two first constant force springs.

[0035] According to some embodiments of the present invention, the third water-blocking structure includes a first filling glue and a second waterproof tape;

[0036] The third water blocking structure is arranged by the following steps:

[0037] Filling the first filling glue at the bifurcation of the multiple core wires of the cable to achieve sealing of the bifurcation;

[0038] A second waterproof tape is wrapped around the outer surface of the filling glue to wrap the first filling glue.

[0039] According to some embodiments of the present invention, the armor tape is arranged by the following steps:

[0040] Grind the exposed armor layers of the cables on both sides to make them rough;

[0041] Using a second fixing structure to fix the two ends of the armor tape to the roughened armor layers of the cable on both sides;

[0042] A third waterproof tape is wrapped around both ends of the armor tape, and the third waterproof tape needs to overlap with the outer sheath layer and the inner sheath layer of the cable.

[0043] According to some embodiments of the present invention, the second fixing structure includes two second constant force springs.

[0044] According to some embodiments of the present invention, the external waterproof sealing layer includes a threaded mesh sleeve, a third sealant, and a glass fiber tape;

[0045] The external waterproof sealing layer is arranged by the following steps:

[0046] The threaded mesh sleeve is wrapped around the outer sheath layer of the cable on one side to the outer sheath of the cable on the other side, and the threaded mesh sleeve covers the mesh sleeve;

[0047] Fixing a glue injection valve on the threaded mesh sleeve;

[0048] The third sealant is wrapped around the outer sheath layer of the cable on one side to the outer sheath of the cable on the other side, and the third sealant forms a sealing wrap around the threaded mesh sleeve;

[0049] Wrapping the glass fiber tape around the third sealant, the glass fiber tape forming a sealed package around the third sealant;

[0050] The resin glue is filled into the glue injection space formed by wrapping the third sealant through the glue injection valve.

[0051] According to some embodiments of the present invention, after arranging the armor tape, the method further comprises: inserting an exhaust pipe on the threaded mesh sleeve;

[0052] The step of filling the waterproof filling glue into the glue injection space formed by wrapping the third sealant by the glue injection valve comprises the following steps:

[0053] Injecting resin glue into the glue injection valve until the resin glue overflows from the exhaust pipe;

[0054] The exhaust pipe is pulled out, and the air holes left in the exhaust pipe are sealed.

[0055] According to some embodiments of the present invention, the glue injection valve is a one-way valve.

[0056] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] Figure 1 It is a process flow chart of a medium and low pressure water blocking type intermediate joint installation process according to an embodiment of the present invention;

[0059] Figure 2 It is a schematic diagram of the position of the mesh sleeve pre-sleeved in one embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of a structure in which cables to be connected on both sides are prepared in accordance with an embodiment of the present invention;

[0061] Figure 4 It is a schematic diagram of the core wire structure of a phase core wire after the shielding layer is stripped off according to an embodiment of the present invention;

[0062] Figure 5 It is a schematic diagram of the core wire structure of a phase core wire after the outer semi-conductive layer is stripped off according to an embodiment of the present invention;

[0063] Figure 6 It is a schematic diagram of the core wire structure of a phase core wire after the core insulation layer is stripped off according to an embodiment of the present invention;

[0064] Figure 7 It is a structural schematic diagram of a three-phase core wire socket joint body according to an embodiment of the present invention;

[0065] Figure 8 This is a schematic structural diagram of a connecting pipe after crimping according to an embodiment of the present invention;

[0066] Fig. 9 This is a structural schematic diagram of a first water-blocking structure of an embodiment of the present invention after arrangement is completed;

[0067] Fig.10 This is a structural schematic diagram of a second water-blocking structure of an embodiment of the present invention after arrangement is completed;

[0068] Fig.11It is a schematic structural diagram of a copper mesh shielding recovery layer arrangement completed in one embodiment of the present invention;

[0069] Fig.12 This is a structural schematic diagram of a third water-blocking structure of an embodiment of the present invention after arrangement is completed;

[0070] Fig.13 This is a schematic diagram of the structure of the armored belt arrangement completed in one embodiment of the present invention;

[0071] Fig.14 This is a schematic structural diagram of a threaded mesh sleeve after arrangement in one embodiment of the present invention;

[0072] Fig.15 It is a structural schematic diagram of the arrangement of the external waterproof sealing layer according to an embodiment of the present invention.

[0073] Reference numerals:

[0074] Connecting pipe 100,

[0075] first sealant 210, first semi-conductive tape 220,

[0076] Connector body 300,

[0077] The second water-blocking structure 400, the second sealant 410, the first waterproof tape 420, the second semi-conductive tape 430,

[0078] Shielding recovery copper mesh 510, first fixing structure 520, first copper braided belt 530,

[0079] Second waterproof tape 610,

[0080] Armor belt 710, second fixing structure 720, third waterproof belt 730,

[0081] Mesh sleeve 810, threaded mesh sleeve 820, glass fiber tape 830, glue injection valve 840, exhaust pipe 850,

[0082] Outer sheath layer 910 , armor layer 920 , inner sheath layer 930 , shielding layer 940 , outer semiconductive layer 950 , core insulation layer 960 , and core 970 . DETAILED DESCRIPTION

[0083] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0084] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0085] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0086] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0087] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments.

[0088] In order to better understand the installation process of the medium and low pressure water blocking type intermediate joint of the present invention, reference is made here to Figures 3 to 6 First, a brief description of the specific application environment is given, that is, the preparation process before the cable installation intermediate joint is introduced.

[0089] Before installing the middle joint, you first need to peel off the outer sheath layer 910, armor layer 920 and inner sheath layer 930 of the cables on both sides to be connected to expose the multiple core wires inside, and the outer sheath layer 910, armor layer 920 and inner sheath layer 930 will form a stepped structure; the specific peeling method can be referred to as follows, straighten and saw the cable ends, and overlap the two cables to be connected by about 400mm, and clean the surface of the cable outer sheath layer 910. Then, strip off the outer sheath layer 910 of 1000mm in length from one cable and strip off the outer sheath layer 910 of 800mm in length from the other cable, grind the end of the outer sheath layer 910 120mm back to roughen it, leave 30mm of armor layer 920 forward from the end face of the outer sheath layer 910, and strip off the rest of the armor layer 920; leave 50mm of inner sheath layer 930 forward from the end of the armor layer 920, strip off the rest of the inner sheath layer 930, grind the outer surface of the inner sheath layer 930 to roughen it, and remove the cable lining. At this time, the outer sheath layer 910, armor layer 920 and inner sheath layer 930 will form a stepped structure. Separate the inner core wires of the cables on both sides, and try to bend each core wire at about 15 times the size of the core wire from the bifurcation, so that the phases on both sides are butt-jointed, and the distance between the phases is about 55mm. Determine the connection center of each phase so that it is 740mm away from the end of the longer end of the cable inner sheath layer 930 and 540mm away from the end of the other end of the cable inner sheath layer 930, and cut off the excess core wire of each phase. At this point, the stripping of the cable outer sheath layer 910, armor layer 920 and inner sheath layer 930 is completed.

[0090] After stripping the outer sheath layer 910, the armor layer 920 and the inner sheath layer 930, the shielding layer 940 and the outer semi-conductive layer 950 of each phase core wire need to be stripped to expose the internal insulation of the core wire for subsequent wiring. Here, the stripping of the core wire of one phase is specifically described. The specific stripping method can be referred to as follows: strip the 280mm long shielding layer 940 at the front end of the core wire, and temporarily wrap the end of the shielding layer 940 with PVC adhesive tape. Measure 180mm from the ends of the two core wires and mark them with PVC adhesive tape, and strip the 180mm long outer semi-conductive layer 950. When stripping, the cross section must be neat, and the wire core insulation layer 960 is not allowed to be scratched. Remove the PVC adhesive tape mark on the outer semi-conductive layer 950, and process the end of the outer semi-conductive layer 950 into a small slope to make a smooth transition with the wire core insulation layer 960. During this process, defects such as pits, steps, and knife marks are not allowed. It should be noted that if there are convex ribs on the surface of the outer semi-conductive layer 950, the ribs should be polished and removed to ensure that the outer semi-conductive layer 950 of the cable is round and smooth. The core wires of the other two phases are processed according to this process.

[0091] After stripping the shielding layer 940 and the outer semi-conductive layer 950 of the core wire, if it is necessary to connect the cables on both sides, the last step of preparation is to strip the core insulation layer 960 of the core wire and sleeve the connector body 300 so that the core 970 inside the core wire is exposed, and the preparation work is completed for the subsequent installation of the connector body 300. Here, the core wire of one phase is specifically described. The specific method can be referred to as follows: measure the length L of the connecting tube 100, and then strip the core insulation layer 960 according to the length of (L+6) / 2mm. The end of the core insulation layer 960 is processed into a step with a length of 5mm and a diameter of (D1-2)mm (where D1 is the outer diameter of the connecting tube 100). It should be noted that if the outer diameter of the connecting tube 100 is greater than the outer diameter of the core 970, the end of the core insulation layer 960 is processed into a step with a length of 5mm and a diameter of (D-4)mm (where D is the outer diameter of the cable insulation layer). Finally, remove the sharp corners at the end of the core insulation layer 960, then use sandpaper to polish the surface of the core insulation layer 960 to remove the semi-conductive dust adsorbed on the surface of the core insulation layer 960, and polish the surface of the core insulation layer 960 until the surface of the core insulation layer 960 is smooth after polishing, without visible scratches and other defects. At this point, the cable preparation work is completed, and the installation of the waterproof intermediate joint can be completed using the medium and low pressure water-blocking intermediate joint installation process of the embodiment of the present invention.

[0092] It should be noted that the various lengths in the above application environment are only for a better description of the application scenario. In actual construction, further adjustments can be made according to the specific cable model, intermediate joint model and construction requirements. That is, the above length limit should not be used as a limitation on the scope of protection of the present invention.

[0093] The installation process of the medium and low pressure water-blocking intermediate joint according to the embodiment of the invention is described below based on the above application scenario.

[0094] refer to Figure 1 The embodiment of the present invention provides a medium-low pressure water-blocking type intermediate joint installation process, and the medium-low pressure water-blocking type intermediate joint installation process includes but is limited to the following steps:

[0095] A plurality of connecting tubes 100 are used to connect a plurality of wire cores 970 of the cables on both sides, and the wire core insulation layer 960 of the cable is prefabricated into a stepped structure;

[0096] A first water blocking structure is provided on the step structure and the connecting pipe 100 to seal the step structure and the connecting pipe 100;

[0097] The plurality of joint bodies 300 are sleeved on the plurality of connecting pipes 100 one by one to form a surrounding for the first water blocking structure, and the joint body 300 is pre-sleeved on each core wire of the cable;

[0098] A second water blocking structure 400 is provided at both ends of each joint body 300 to achieve sealing at both ends of each joint body 300;

[0099] A copper mesh shielding restoration layer is constructed outside each connector body 300 and the corresponding second water-blocking structure 400, and two ends of the copper mesh shielding restoration layer are connected to the shielding layers 940 of the core wires on both sides in a one-to-one correspondence;

[0100] A third water-blocking structure is provided at the bifurcation of the plurality of core wires of the cable;

[0101] A plurality of connector bodies 300 are gathered together to form a connection body, an armor tape 710 is arranged on the connection body, and two ends of the armor tape 710 are respectively connected to the armor layers 920 of the cables on both sides in a one-to-one correspondence;

[0102] The mesh sleeves 810 pre-sleeved on the cables on both sides are sleeved on the connection body, and the mesh sleeves 810 on each side of the cable extend from the outer sheath layer 910 of the cable to the connector body 300, and there is an overlapping area between the two mesh sleeves 810;

[0103] An external waterproof sealing layer is provided on the mesh sleeve 810 to achieve sealing of the connection body.

[0104] The waterproof intermediate joint in the embodiment of the present invention includes a connecting pipe 100, a first water-blocking structure, a joint body 300, a second water-blocking structure 400, a copper mesh shielding recovery layer, an armor tape 710, a mesh sleeve 810 and an external waterproof sealing layer. The installation process of the medium and low pressure water-blocking intermediate joint in the embodiment of the present invention specifically defines how these structures are installed or formed. It should be noted that after the cable preparation work is completed, the multiple core wires in the cables on both sides can be divided into multiple groups according to each phase. For example, if a three-phase cable is used, the three core wires in the cables on both sides will be arranged one by one according to the three phases to facilitate subsequent connection.

[0105] First, before the cables are prepared, mesh sleeves 810 (such as Figure 2 After the cable preparation is completed, the two core wires of each phase are connected using the connecting tube 100, and after the connection is completed, the step structure (such as Figure 6 As shown in FIG. 1 , a first water-blocking structure is provided on the step structure and the connecting tube 100 to seal the step structure and the connecting tube 100. After sealing, the flatness of the plane at the connection needs to be ensured. Then, the connector body 300 pre-sleeved on one side of the cable can be pushed to the connection (refer to FIG. 1 ). Figures 7 to 10 ), the first water blocking structure is surrounded; however, there will still be a certain gap at both ends of the joint body 300, at this time, the second water blocking structure 400 is arranged at both ends of the joint body 300 (reference Fig.10) to complete the sealing of both ends of the connector body 300 and realize waterproofing inside the connector. At the same time, in order to ensure the shielding effect after the core wires are connected, the shielding layer 940 needs to be restored. Here, by constructing a copper mesh shielding restoration layer outside the connector body 300 and the second water-blocking structure 400, the copper shielding layer 940 of the core wires on both sides is connected and completely wrapped at the connection, thereby achieving the purpose of restoring the shielding. Fig.11 As shown; Reference Fig.12 , Fig.13 Then, you can use PVC tape or heat shrink tube to gather the three-phase joint body 300 together, and set a third water-blocking structure at the bifurcation of the three-phase core wire to seal it. After that, use the armor tape 710 to complete the restoration of the cable armor on both sides. The armor tape 710 can be wrapped around the connection body for several turns. After that, push the mesh sleeves 810 of the cables on both sides onto the joint body 300 from both sides until the two mesh sleeves 810 overlap. At this time, the unoverlapped parts of the two mesh sleeves 810 will cover the outer sheath of the cable on their respective sides. The mesh sleeve 810 can further fix multiple joint bodies 300; finally, arrange an external waterproof layer outside the mesh sleeve 810 to achieve the rice noodle setting of the entire joint body 300.

[0106] The installation process of the medium and low pressure water-blocking intermediate joint in the embodiment of the present invention can effectively ensure the waterproofness of the wire core 970 by setting the end of the wire core insulation layer 960 as a step structure and using the first water-blocking structure to seal the step structure and the connecting pipe 100, and then the second water-blocking structure 400 is set to seal the two sides of the joint body 300, so as to ensure the waterproofness of the joint body 300. After that, the shielding layer 940 and the armor layer 920 are waterproofed by setting an external waterproof sealing layer, and finally an intermediate joint with a multi-layer water-blocking structure is obtained; at the same time, the embodiment of the present invention adopts a mesh sleeve 810 to fix multiple joint bodies 300, and the fixing operation is simple and the effect is excellent; in addition, the installation process of the medium and low pressure water-blocking intermediate joint in the embodiment of the present invention also uses an armor tape 710 and a copper mesh shielding recovery layer to restore the armor layer 920 and the shielding layer 940, thereby ensuring the integrity of the cable performance. The installation process of the medium and low pressure water-blocking intermediate joint in the embodiment of the present invention uses a multi-layer waterproofing method for waterproofing, which greatly improves the waterproof ability of the intermediate joint. While ensuring the waterproof ability, it will not damage the original performance of the cable, and is suitable for industrial promotion.

[0107] In some embodiments, the connecting pipe 100 is installed by the following steps:

[0108] Grinding the surface of the core wire and the connecting tube 100 to remove the surface oxide layer;

[0109] Clean the core wire and the connecting tube 100;

[0110] The two core wires to be connected are placed in the connecting tube 100 and crimped, so that the connecting tube 100 completes the connection of the two core wires.

[0111] refer to Figure 8 It should be noted that when cleaning the core wire, it is necessary to wait for the cleaning agent to completely evaporate before continuing with the subsequent steps. When crimping the connecting tube 100, the crimping operation can be completed by crimping two passes at each end of the connecting tube 100. It should be noted that the specific crimping method can be adjusted according to needs.

[0112] After the crimping is completed, it is necessary to further grind off the burrs at both ends of the connecting tube 100, determine the center position between the ends of the core insulation layer 960 of the two core wires, and measure 215mm and 245mm from the center position to the end of the shorter cable, and make marks (such as Figure 8 As shown in the figure, M1 is mark 1 and M2 is mark 2) for use in subsequent installation steps.

[0113] In some embodiments, the first water-blocking structure includes a first sealant 210 and a first semi-conductive tape 220;

[0114] The first water blocking structure is arranged by the following steps:

[0115] Wrap the first sealant 210 between the two ends of the connecting tube 100 and the stepped structures on both sides to fill the gap between the two ends of the connecting tube 100 and the stepped structures on both sides, and part of the sealant 210 overlaps the connecting tube 100 and covers the stepped structures;

[0116] The first semi-conductive tape 220 is wrapped between the two side core insulation layers 960 to wrap the first sealant 210 and the connecting tube 100 .

[0117] refer to Fig. 9 First, the gap between the connecting tube 100 and the end of the core insulation layer 960 is wrapped with the first sealant 210 to fill the gap between the two ends of the connecting tube 100 and the core insulation layer 960, and then the first semi-conductive tape 220 is wrapped between the core insulation layers 960 at both ends in a half-lap manner. Finally, the closing position of the first semi-conductive tape 220 (such as Figure 7 Through these steps, effective waterproofing of the connection of the wire core 970 can be achieved.

[0118] Specifically, the first sealant 210 is wrapped around the gap between the connecting tube 100 and the end of the wire core insulation layer 960 (the sealant should be stretched by about 200% when wrapping), and the gap between the two ends of the connecting tube 100 and the wire core insulation layer 960 is filled, and the first sealant 210 is required to overlap the connecting tube 100 by about 20 mm and cover the 5 mm step at the end of the wire core insulation layer 960; then, the first semi-conductive tape 220 is half-lapped between the two ends of the wire core insulation layer 960, and the shape after wrapping should be round, and the outer diameter after wrapping should be the same as the outer diameter of the core insulation layer 960. 0 outer diameter is basically equal (for example: when the outer diameter of the connecting tube 100 is larger than the outer diameter of the core insulation layer 960, 1-2 layers of the first semi-conductive tape 220 are wrapped around the outer surface of the connecting tube 100 in a semi-lap manner, and the outer diameter of the wrapping is ≤ D1+2mm), and finally 2 layers of black PVC adhesive tape with a width of 50mm are wrapped around the end of the first semi-conductive tape 220 for sealing; it should be noted that when wrapping the first semi-conductive tape 220, it should be stretched to about 200%, and ensure that the semi-lapping is reliable, and when wrapping the black PVC adhesive tape, ensure that the end cut after wrapping is firmly bonded. Afterwards, clean the core insulation layer 960, the outer semi-conductive layer 950, and the shielding layer 940 of the core wire with a cleaning towel, blow dry, and evenly apply a layer of silicone oil on the surface of the core insulation layer 960. Move the joint body 300 to the center, evenly remove the liner strip in the counterclockwise direction to shrink the joint body 300, and make one end of the joint body 300 flush with mark 1, and wipe off the extruded silicone oil. Check whether the distance between the joint body 300 and mark 2 is 245mm after shrinkage, otherwise move the joint body 300 to make the distance approximately 245mm. Process other phases in the same way.

[0119] In some embodiments, the second water-blocking structure 400 includes a second sealant 410 , a first waterproof tape 420 , and a second semi-conductive tape 430 ;

[0120] The second water blocking structure 400 is arranged by the following steps:

[0121] The second sealant 410 is used to wrap the two ends of the joint body 300 and the shielding layer 940 adjacent to the two ends of the joint body 300, and part of the sealant 410 overlaps the shielding layer 940 and the joint body 300;

[0122] Wrap multiple layers of the first waterproof tape 420 on the second sealant 410, and the first waterproof tape 420 needs to cover the second sealant 410, so that a conical transition shape is formed at the end step of the joint body 300;

[0123] The second semi-conductive tape 430 is used to wrap the first waterproof tape 420 and wrap the first waterproof bag.

[0124] refer to Fig.10After the connector body 300 is installed in place, in order to further ensure the waterproof effect, waterproof construction needs to be performed on both ends of the connector body 300. First, the second sealant 410 needs to be wrapped around the two ends of the connector body 300 and the shielding layer 940 of the cable, and after wrapping the second sealant 410, the first waterproof tape 420 is further wrapped on the second sealant 410. The first waterproof tape 420 needs to wrap the water-blocking structure formed by the second sealant 410. Finally, the second semi-conductive tape 430 is wrapped around the first waterproof tape 420 and wrapped around the first waterproof tape 420 to complete the waterproof operation on both ends of the connector body 300.

[0125] Specifically, remove the marks and other markings on the shielding layer 940 in the previous steps, clean the two ends of the connector body 300 and the outer semi-conductive layer 950, wrap the second sealant 410 around the two ends of the connector body 300 and the shielding layer 940, and require that the second sealant 410 overlaps the shielding layer 940 and the ends of the connector body 300 by about 20 mm, and then wrap 5 layers of the first waterproof tape 420 around the second sealant 410, and the two ends cover the second sealant 410 by about 30 mm, and finally make the step at the end of the connector body 300 wrap and fill into a conical transition shape. Finally, wrap two layers of the second semi-conductive tape 430 around the first waterproof tape 420, and the two ends cover the first waterproof tape 420 by about 15 mm. Process other phases according to this process.

[0126] In some embodiments, the copper mesh shielding restoration layer includes a shielding restoration copper mesh 510 and a first fixing structure 520;

[0127] The copper screen restoration layer is laid out by following the steps below:

[0128] Wrap the shielding restoration copper mesh 510 around the connector body 300 to form a wrap around the connector body 300, and overlap the two ends of the shielding restoration copper mesh 510 on the shielding layers 940 of the cables at both sides;

[0129] The shielding restoration copper mesh 510 is fixed on the shielding layer 940 by using the first fixing structure 520 .

[0130] refer to Fig.11 During the cable connection process, in addition to ensuring the electrical transmission capacity of the cable, the function of the shielding layer 940 needs to be restored to ensure that the overall performance of the cable will not be reduced. When restoring the shielding layer 940, first wrap the shielding restoration copper mesh 510 around the connector body 300 and the second water-blocking structure 400 at both ends, and after wrapping, the two ends of the shielding restoration copper mesh 510 need to be able to overlap the shielding layer 940, and then use the first fixing structure 520 to fix the two ends of the shielding restoration copper mesh 510 on the shielding layer 940.

[0131] Specifically, the shielding restoration copper mesh 510 is wrapped around the connector body 300 in a manner of overlapping by about 10 mm, and the two ends of the shielding restoration copper mesh 510 are overlapped with the shielding layer 940 by about 50 mm respectively, and are tightly held on the shielding layer 940 by the first fixed structure 520 to connect the shielding layer 940; it should be noted that the copper mesh shielding restoration layer can also be pre-inserted onto the stripped shorter cable core wire when stripping the core insulation layer 960, and then inserted into the connector body 300 in this step.

[0132] In some embodiments, the copper mesh shielding restoration layer includes a shielding restoration copper mesh 510, a first fixing structure 520, and a first copper braided tape 530; the shielding restoration copper mesh 510 includes a plurality of set copper meshes;

[0133] The copper screen restoration layer is laid out by following the steps below:

[0134] A plurality of sheathed copper meshes are sequentially sheathed on the connector body 300 to form a multi-layer sheathed structure and wrap the connector body 300, and two ends of the sheathed copper meshes are overlapped on the shielding layers 940 of the cables on both sides;

[0135] A first copper braid 530 is arranged along the connector body 300, and two ends of the first copper braid 530 are overlapped on the shielding layer 940 of the cable;

[0136] The two ends of the shielding restoration copper mesh 510 and the two ends of the first copper braided belt 530 are simultaneously fixed on the shielding layer 940 by using the first fixing structure 520 .

[0137] refer to Fig.11 If the shielding recovery copper mesh 510 adopts a set copper mesh, it is necessary to sequentially sleeve multiple set copper meshes to ensure the overall effect of the copper mesh. And after the set copper mesh is arranged, the first copper braided belt 530 needs to be fixed to the shielding layer 940 of the core wires on both sides through the first fixing structure 520. It should be noted that the set copper mesh needs to overlap the shielding layer 940 on both sides by 50mm to ensure the overall shielding performance.

[0138] In some embodiments, the first fixed structure 520 includes two first constant force springs. In this embodiment, the first constant force spring is selected as the first fixed structure 520. The constant force spring is low in cost and simple to install. It is also easy to disassemble and suitable for large-scale use. In addition, in some embodiments, the first fixed structure 520 can also be directly formed by welding with a welding gun, that is, the shielding recovery copper mesh 510 can be directly welded to the shielding layer 940 by welding.

[0139] In some embodiments, the third water-blocking structure includes a first filling glue and a second waterproof tape 610;

[0140] The third water blocking structure is arranged by the following steps:

[0141] Filling the first filling glue at the bifurcation of the multiple core wires of the cable to achieve sealing of the bifurcation;

[0142] The second waterproof tape 610 is wrapped around the outer surface of the filling glue to wrap the first filling glue.

[0143] refer to Fig.12 After the shielding layer 940 of each phase of the cable is restored, it is necessary to gradually restore the other structural properties of the cable. First, fill the first filling glue at the intersection of multiple core wires in the inner sheath layer 930, and wrap the second waterproof tape 610 around the outer surface of the first filling glue, so as to complete the anti-seepage treatment of the inner sheath layer 930.

[0144] In some embodiments, armor tape 710 is arranged by the following steps:

[0145] Grind the exposed armor layer 920 of the cables on both sides to make them rough;

[0146] Use the second fixing structure 720 to fix the two ends of the armor tape 710 on the roughened armor layers 920 of the cables on both sides;

[0147] The third waterproof tape 730 is wrapped around both ends of the armor tape 710, and the third waterproof tape 730 needs to overlap with the outer sheath layer 910 and the inner sheath layer 930 of the cable.

[0148] refer to Fig.13 After sealing the cable core bifurcation, the three-phase connector body 300 will be gathered to form a connection body, and then the armor layer 920 can be restored. First, the exposed armor layer 920 of the cables on both sides needs to be roughened. The roughening can be done only with a saw blade or a file. Then, the two ends of the armor tape 710 are fixed to the armor layer 920 on both sides with the second fixing structure 720, so as to restore the armor layer 920. Finally, the third waterproof tape 730 is wrapped around the two ends of the armor tape 710 to achieve watertightness at both ends of the armor layer 920. It should be noted that after the third waterproof tape 730 is wrapped, the third waterproof tape 730 needs to overlap with the outer sheath layer 910 and the inner sheath layer 930 at the same time. In some embodiments, the overlap is about 30mm.

[0149] In some embodiments, the second fixing structure 720 includes two second constant force springs. The constant force springs are inexpensive and easy to install, and are also easy to disassemble, and are suitable for large-scale use. In addition, in some embodiments, the second fixing structure 720 can also be directly formed by welding with a welding gun, that is, the shielding recovery copper mesh 510 can be directly welded to the shielding layer 940 by welding.

[0150] In some embodiments, the external waterproof sealing layer includes a threaded mesh sleeve 820, a third sealant, and a fiberglass tape 830;

[0151] The external waterproof seal is arranged by the following steps:

[0152] The threaded mesh sleeve 820 is wrapped around the outer sheath layer 910 of the cable on one side to the outer sheath of the cable on the other side, and the threaded mesh sleeve 820 covers the mesh sleeve 810;

[0153] The glue injection valve 840 is fixed on the threaded mesh sleeve 820;

[0154] The third sealant is wrapped around the outer sheath layer 910 of the cable on one side to the outer sheath of the cable on the other side, and the third sealant forms a sealing package for the threaded mesh sleeve 820;

[0155] Wrapping a glass fiber tape 830 on the third sealant, the glass fiber tape 830 forms a sealing package for the three sealants;

[0156] The resin glue is filled into the glue injection space formed by wrapping the third sealant through the glue injection valve 840.

[0157] refer to Fig.14 , 15 After the armor layer 920 is restored, the mesh sleeve 810 will be pushed into the connection body from both sides, and the injection valve 840 will be fixed. Then, the mesh sleeve 810 will be wrapped with the threaded mesh sleeve 820. The wrapping needs to be wrapped from the outer sheath layer 910 of the cable on one side to the outer sheath layer 910 on the other side, and it needs to be wrapped back and forth many times to ensure the wrapping effect. After the wrapping is completed, the mesh sleeve 810 needs to be completely covered. Then wrap the third sealing tape on the threaded mesh sleeve 820. The third sealing tape wrapping needs to be wrapped from the outer sheath layer 910 of the cable on one side to the outer sheath layer 910 on the other side, and it needs to be wrapped back and forth many times to ensure the sealing effect. Finally, wrap the glass fiber tape 830 on the third sealant to form a package for the third sealant, and then inject the glue from the injection valve 840.

[0158] In some embodiments, after the armor tape 710 is arranged, the method further includes: inserting an exhaust pipe 850 on the threaded mesh sleeve 820;

[0159] Filling the waterproof filling glue into the glue injection space formed by wrapping the third sealant through the glue injection valve 840 includes the following steps:

[0160] Inject resin glue into the glue injection valve 840 until the resin glue overflows from the exhaust pipe 850;

[0161] Pull out the exhaust pipe 850 and seal the air hole left by the exhaust pipe 850.

[0162] refer to Fig.14 , Fig.15 When the resin glue is injected into the glue injection valve 840, if the resin glue overflows from the exhaust pipe 850750, it means that the glue has been filled. At this time, the exhaust pipe 850750 can be pulled out with needle-nosed pliers and sealed at the position of the air hole at the end. The exhaust pipe 850 can make the glue injection process smoother and can also effectively reduce the bubbles generated during the glue injection process.

[0163] In some embodiments, the glue injection valve 840 is a one-way valve. The use of a one-way valve eliminates the need to use a sealing cover to seal the one-way valve, which can further simplify the operating steps. It should be noted that in some embodiments, the glue injection valve 840 can also use an ordinary valve, and after the glue injection is completed, a sealing cover can be used for sealing. It is understandable that in some embodiments, in order to protect the one-way valve, a layer of glass fiber tape 830 will be wrapped around the middle joint after the glue injection is completed. In addition, in some embodiments, after the glue injection is completed, the outer sheath layer 910 at one end of the cable is wrapped with a fireproof belt in a half-overlap manner to the outer sheath layer 910 at the other end, and then a layer of black PVC self-adhesive tape is wrapped outside the fireproof belt in the same manner as above to form a PVC self-adhesive tape layer, and finally a layer of armor tape 710 is wrapped on the PVC self-adhesive tape layer in a 1 / 3 overlap manner.

[0164] In some embodiments, the mesh cover 810 may be a plastic mesh cover 810. The plastic mesh cover 810 is inexpensive and can meet the use requirements in the embodiments of the present invention.

[0165] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A medium and low pressure water blocking type intermediate joint installation process, characterized in that: include: Use multiple connecting tubes to connect multiple wire cores of cables on both sides, and the wire core insulation layer of the cable is prefabricated into a stepped structure; A first water-blocking structure is provided on the step structure and the connecting pipe to seal the step structure and the connecting pipe; A plurality of joint bodies are sleeved on the plurality of connecting pipes one by one to surround the first water-blocking structure, and the joint bodies are pre-sleeved on each core wire of the cable; A second water-blocking structure is provided at both ends of each joint body to achieve sealing at both ends of each joint body; Constructing a copper mesh shielding restoration layer outside each of the connector bodies and the corresponding second water-blocking structure, and connecting two ends of the copper mesh shielding restoration layer to the shielding layers of the core wires on both sides one by one; A third water-blocking structure is provided at the bifurcation of the plurality of core wires of the cable; Bringing together a plurality of the connector bodies to form a connection body, arranging an armor tape on the connection body, and connecting the two ends of the armor tape to the armor layers of the cables on both sides one by one; Sleeve the mesh sleeves pre-sleeved on the cables on both sides onto the connecting body, wherein the mesh sleeves on each side of the cables extend from the outer sheath layer of the cables to the connector body, and there is an overlapping area between the two mesh sleeves; An external waterproof sealing layer is provided on the mesh sleeve to achieve sealing of the connection body; The external waterproof sealing layer includes a threaded mesh sleeve, a third sealant, and a glass fiber tape; The external waterproof sealing layer is arranged by the following steps: The threaded mesh sleeve is wrapped around the outer sheath layer of the cable on one side to the outer sheath of the cable on the other side, and the threaded mesh sleeve covers the mesh sleeve; Fixing a glue injection valve on the threaded mesh sleeve; The third sealant is wrapped around the outer sheath layer of the cable on one side to the outer sheath of the cable on the other side, and the third sealant forms a sealing wrap around the threaded mesh sleeve; Wrapping the glass fiber tape around the third sealant, so that the glass fiber tape forms a sealing package for the third sealant; The resin glue is filled into the glue injection space formed by wrapping the third sealant through the glue injection valve.

2. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 is characterized in that: The first water-blocking structure includes a first sealant and a first semi-conductive tape; The first water blocking structure is arranged by the following steps: The first sealant is wrapped between the two ends of the connecting pipe and the stepped structures on both sides to fill the gaps between the two ends of the connecting pipe and the stepped structures on both sides, and part of the sealant in the first sealant overlaps the connecting pipe and covers the stepped structures; The first semi-conductive tape is wrapped between the wire core insulation layers on both sides to wrap the first sealant and the connecting tube.

3. The installation process of the medium and low pressure water blocking intermediate joint according to claim 1 is characterized in that: The second water-blocking structure includes a second sealant, a first waterproof tape, and a second semi-conductive tape; The second water blocking structure is arranged by the following steps: Using the second sealant to wrap the two ends of the joint body and the shielding layer adjacent to the two ends of the joint body, and a portion of the second sealant overlaps the shielding layer and the joint body; Wrapping multiple layers of the first waterproof tape on the second sealant, and the first waterproof tape needs to cover the second sealant, so that a conical transition shape is formed at the end step of the joint body; The second semi-conductive tape is used to wrap the first waterproof tape, thereby forming a package around the first waterproof tape.

4. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 is characterized in that: The copper mesh shielding recovery layer includes a shielding recovery copper mesh and a first fixing structure; The copper mesh shielding recovery layer is arranged by the following steps: Wrap the shielding restoration copper mesh around the connector body to form a wrap around the connector body, and overlap the two ends of the shielding restoration copper mesh on the shielding layers of the cables on both sides; The shielding restoration copper mesh is fixed on the shielding layer by using the first fixing structure.

5. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 is characterized in that: The copper mesh shielding restoration layer comprises a shielding restoration copper mesh, a first fixing structure and a first copper braided belt; the shielding restoration copper mesh comprises a plurality of set copper meshes; The copper mesh shielding recovery layer is arranged by the following steps: Sequentially sheathing a plurality of the sheathed copper meshes on the connector body to form a multi-layer sheathed structure and wrap the connector body, with the two ends of the sheathed copper meshes overlapped on the shielding layers of the cables on both sides; The first copper braid is arranged along the connector body, and two ends of the first copper braid are overlapped on the shielding layer of the cable; The two ends of the shielding restoration copper mesh and the two ends of the first copper braided belt are simultaneously fixed on the shielding layer by using the first fixing structure.

6. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 is characterized in that: The third water-blocking structure includes a first filling glue and a second waterproof tape; The third water blocking structure is arranged by the following steps: Filling the first filling glue at the bifurcation of the multiple core wires of the cable to achieve sealing of the bifurcation; The second waterproof tape is wrapped around the outer surface of the filling glue to wrap the first filling glue.

7. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 is characterized in that: The armor tape is arranged by the following steps: Grind the exposed armor layers of the cables on both sides to make them rough; Using a second fixing structure to fix the two ends of the armor tape to the roughened armor layers of the cable on both sides; A third waterproof tape is wrapped around both ends of the armor tape, and the third waterproof tape needs to overlap with the outer sheath layer and the inner sheath layer of the cable.

8. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 is characterized in that: After the armor tape is arranged, the method further includes: inserting an exhaust pipe on the threaded mesh sleeve; The step of filling the waterproof filling glue into the glue injection space formed by wrapping the third sealant by the glue injection valve comprises the following steps: Injecting resin glue into the glue injection valve until the resin glue overflows from the exhaust pipe; The exhaust pipe is pulled out, and the air holes left in the exhaust pipe are sealed.

9. The installation process of the medium and low pressure water blocking type intermediate joint according to claim 1 or 8, characterized in that: The glue injection valve is a one-way valve.

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