Connection structure of cable metal sleeve and terminal tail pipe

Abstract

The utility model discloses a cable metal cover and terminal tail pipe's connecting structure relates to cable technical field. Including flange interface and cable aluminium cylinder, the flange interface and cable aluminium cylinder junction between filling has welding structural member, and welding structural member passes through laser welding and flange interface and cable aluminium cylinder welding fixed, and the flange interface and cable aluminium cylinder surface still cover and set up clamp, and the clamp and flange interface and cable aluminium cylinder between filling have glue. The utility model discloses through the setting of welding structural member and clamp etc. have excellent sealing performance, can effectively prevent the influence of harmful factors such as outside moisture, oil gas to cable joint, avoid the cable joint and damage because of damp, corrosion and so on. Still can prevent cable joint and suffer mechanical damage, such as external force impact, extrusion etc. to the integrity and stability of protection cable joint.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to the connection structure between the cable metal sheath and the terminal tail tube. Background Technology

[0002] Currently, the common method for handling cable terminations and metal sheaths is to connect the cable's aluminum sheath to the tailpipe using lead sealing. The procedure involves using a burner flame to heat the lead sealing solder on the tailpipe and the cable's aluminum sheath. While the solder is in a semi-solid state, the semi-solid aluminum sheath is manually shaped and then solidified again to form a complete metal seal. However, due to the high temperature of both the burner flame and the semi-solid lead strip, prolonged heating can cause excessive cross-linking of the cable's main insulation. This cross-linking alters the cable's original electric field distribution, leading to stress concentration and severely impacting the entire circuit's operation, posing a threat to its stability. During on-site construction, cable insulation burnout is frequently encountered.

[0003] The main reasons for the cracking of the lead seal in cables are as follows:

[0004] 1. Stress Changes: Lead sealing is a commonly used cable sealing technology, with advantages such as high mechanical strength and reliable performance. However, due to certain defects in the lead sealing process, if it is damaged during construction or subjected to prolonged external temperature changes, cracks may appear in the lead seal.

[0005] 2. Temperature Changes: During cable terminal installation, poor lead enamel work can cause lead stripping and lead seal cracking, leading to moisture ingress. Abnormal heating also accelerates the lead oxidation process, causing defects to expand and creating a vicious cycle. This leads to thermal aging of the cable's main insulation, ultimately resulting in cable insulation breakdown.

[0006] To ensure the safe and stable operation of cables, it is necessary to regularly check the lead seal status of cable joints and promptly detect and address cracking issues. This utility model proposes a novel solution. Utility Model Content

[0007] The purpose of this invention is to provide a connection structure between the cable metal sleeve and the terminal tail tube, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a connection structure between a cable metal sheath and a terminal tail tube, including a flange interface and a cable aluminum cylinder, wherein a welded structural component is filled between the flange interface and the cable aluminum cylinder connection, and the welded structural component is welded and fixed to the flange interface and the cable aluminum cylinder by laser welding.

[0009] A clamp is also fitted onto the flange interface and the surface of the cable aluminum cylinder, and glue is filled between the clamp, the flange interface, and the cable aluminum cylinder.

[0010] Furthermore, weld seam A and weld seam B are formed between the welded structural component and the cable aluminum cylinder and flange interface, respectively, with weld seam B being formed by ground welding or prefabrication welding.

[0011] Furthermore, the welded structural component is annular in shape, with the outer wall diameter of the end of the welded structural component near the flange interface being the same as the outer wall diameter of the flange interface, and the end of the welded structural component near the cable aluminum cylinder having the same inner wall diameter as the cable aluminum cylinder.

[0012] Furthermore, the welded structural component is an aluminum structural component, and the filler thickness of the welded structural component is 3mm-8mm.

[0013] Furthermore, the welded structural component is an aluminum-copper structural component, with the end facing the cable aluminum cylinder being an aluminum structural component and the end facing the flange interface being a copper structural component.

[0014] Furthermore, the clamp is formed by combining two semi-circular plates into a cylindrical body, and the diameter of the clamp, which is respectively fitted onto the cable aluminum cylinder and the flange interface, is larger than the diameter of the cable aluminum cylinder and the flange interface.

[0015] Furthermore, the fixture surface is provided with several grooves around the perimeter, with a groove depth of 1mm. After the fixtures are combined, they are laser welded and fixed into a cylindrical fixture set on the flange interface and the surface of the cable aluminum cylinder.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The connection structure between the cable metal sheath and the terminal tail pipe, through the use of welded structural components and clamps, provides excellent sealing performance. This effectively prevents the cable joint from being affected by harmful external factors such as moisture and oil vapors, avoiding damage due to dampness or corrosion. It also protects the cable joint from mechanical damage, such as impacts and compression, thus safeguarding its integrity and stability.

[0018] Meanwhile, the mechanical locking device for cable joints can provide a more secure and stable fixation and protection for cable joints, thereby improving the safety and reliability of cable joints. It can also prevent unauthorized personnel from operating or tampering with the equipment, ensuring the normal operation of the equipment and the stability of the power system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0021] Figure 3 This is a schematic diagram of the clamp installation structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the clamp structure of this utility model;

[0023] Figure 5 This is a schematic diagram of an embodiment of the present invention.

[0024] In the diagram: 1. Flange interface; 2. Cable aluminum cylinder; 3. Welded structural component; 4. Clamp; 401. Groove; 5. Adhesive. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1-5 As shown, this utility model provides a technical solution: a connection structure between a cable metal sheath and a terminal tail tube, including a flange interface 1 and a cable aluminum tube 2, wherein a welded structural component 3 is filled between the flange interface 1 and the cable aluminum tube 2, and the welded structural component 3 is welded and fixed to the flange interface 1 and the cable aluminum tube 2 by laser welding.

[0027] A clamp 4 is also fitted on the surface of the flange interface 1 and the cable aluminum cylinder 2, and glue 5 is filled between the clamp 4 and the flange interface 1 and the cable aluminum cylinder 2.

[0028] To ensure the smooth implementation of this embodiment, it is necessary to understand that weld seam A and weld seam B are formed between the welded structural component 3, the cable aluminum cylinder 2, and the flange interface 1, respectively. Weld seam B is formed by ground welding or prefabrication welding. Weld seam A and weld seam B are formed by laser welding. Laser welding has concentrated energy and a small heat-affected zone, which can effectively ensure the strength of the weld seam. This enables the welded structural component 3 to form a high-strength connection with the flange interface 1 and the cable aluminum cylinder 2, significantly improving the tensile and vibration resistance of the overall structure.

[0029] To ensure the smooth implementation of this embodiment, it is necessary to understand that the welded structural component 3 is annular, the outer wall diameter of the end of the welded structural component 3 near the flange interface 1 is the same as the outer wall diameter of the flange interface 1, and the inner wall diameter of the end of the welded structural component 3 near the cable aluminum cylinder 2 is the same as the inner wall diameter of the cable aluminum cylinder 2.

[0030] like Figure 3 and Figure 5As shown, to ensure the smooth implementation of this embodiment, it is necessary to understand that the welded structural component 3 is an aluminum structural component with a filler thickness of 3mm-8mm, or the welded structural component 3 is an aluminum-copper structural component with the end facing the cable aluminum cylinder 2 being an aluminum structural component and the end facing the flange interface 1 being a copper structural component. When the welded structural component 3 is aluminum, aluminum has good ductility and corrosion resistance, which is consistent with the material of the cable aluminum cylinder 2, reducing electrochemical corrosion. Moreover, the filler thickness of 3mm-8mm can balance the connection strength and the lightweight requirements. When it is an aluminum-copper structural component, the aluminum end facing the cable aluminum cylinder 2 can ensure good compatibility with the aluminum cylinder, and the copper end facing the flange interface 1 can be adapted to the flange interface, which may be made of copper, improving the reliability of the connection between dissimilar materials.

[0031] like Figure 2 and Figure 3 As shown, to ensure the smooth implementation of this embodiment, it is necessary to understand that the clamp 4 is formed by combining two semi-circular plates into a cylindrical body, and the diameter of the clamp 4, which is respectively fitted onto the cable aluminum cylinder 2 and the flange interface 1, is larger than the diameter of the cable aluminum cylinder 2 and the flange interface 1.

[0032] like Figure 3 and Figure 4 As shown, in order to ensure the smooth implementation of this embodiment, it is necessary to understand that the surface of the clamp 4 is provided with a number of grooves 401 around the perimeter, the grooves 401 are 1mm deep, and the clamp 4 is laser welded and fixed to the cylindrical clamp 4 set on the surface of the flange interface 1 and the cable aluminum cylinder 2 after being combined.

[0033] A mechanical locking and sealing device for aluminum cable joints is used to seal the joints during the installation of outdoor porcelain bushings and composite sleeve terminals of YJZWFY4-110kV cross-linked polyethylene insulated power cables.

[0034] Step 1: Seal the connector of the cable, align the cable to ensure it is centered in the tail tube, assemble the tail tube, apply silicone sealant to the sealing ring and place it in the sealing groove of the tail tube, assemble the tail tube, and bend the V-groove at the end of the tail tube downward to form a slope transition with the cable.

[0035] Step 2: Weld the welding structure 3 to the cable aluminum cylinder 2 on site using laser welding to form an aluminum-aluminum butt weld.

[0036] Step 3: Begin by partially overlapping and wrapping two layers of waterproof tape around the welded structural component 3 and the copper braided tape weld joint. This should cover the tail pipe and the outer sheath of the cable by at least 40mm. Then, partially overlap and wrap two layers of PVC adhesive tape around the outside of the waterproof tape to reinforce the seal.

[0037] Step 4: Secure the clamp 4 tightly to the cable aluminum drum 2 with the buckle, then weld the clamp 4 together by laser welding, and inject high-temperature resistant sealant between the clamp 4, the cable aluminum drum 2, and the flange interface 1 to improve the tensile strength.

[0038] Step 5: Slide the heat shrink tubing onto the end of the cable sheath. Use a 240# sander to roughen the circumferential surface of the cable outer sheath covered by the hot melt adhesive at the end of the heat shrink tubing. The roughening width should be about 200mm. After sanding, clean and dry the sanded surface. Then heat the heat shrink tubing to shrink it. The heat shrink tubing should cover at least 50mm of the cable outer sheath. Half-overlap two layers of waterproof tape around both ends of the shrunken heat shrink tubing. Half-overlap two layers of PVC adhesive tape over the waterproof tape to cover the ends of the heat shrink tubing.

[0039] Step 6: Secure the cable with a cable clamp at a distance of approximately 100-1000mm from the tailpipe wrapping area. This completes the cable joint sealing process.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A connection structure between a cable metal sheath and a terminal tailpipe, comprising a flange interface (1) and a cable aluminum tube (2), characterized in that: A welded structural component (3) is filled between the flange interface (1) and the cable aluminum cylinder (2). The welded structural component (3) is welded and fixed to the flange interface (1) and the cable aluminum cylinder (2) by laser welding. A clamp (4) is also fitted on the surface of the flange interface (1) and the cable aluminum cylinder (2), and glue (5) is filled between the clamp (4) and the flange interface (1) and the cable aluminum cylinder (2).

2. The connection structure between the cable metal sheath and the terminal tail tube according to claim 1, characterized in that: Welded structural component (3) is connected to cable aluminum cylinder (2) and flange interface (1) by weld seam A and weld seam B respectively. Weld seam B is formed by ground welding or prefabrication.

3. The connection structure between the cable metal sheath and the terminal tail tube according to claim 1, characterized in that: The welded structural component (3) is in the shape of a ring. The outer diameter of the end of the welded structural component (3) near the flange interface (1) is the same as the outer diameter of the flange interface (1). The end of the welded structural component (3) near the cable aluminum cylinder (2) is the same as the inner diameter of the cable aluminum cylinder (2).

4. The connection structure between the cable metal sheath and the terminal tail tube according to claim 1, characterized in that: The welded structural component (3) is an aluminum structural component, and the filler thickness of the welded structural component (3) is 3mm-8mm.

5. The connection structure between the cable metal sheath and the terminal tail tube according to claim 1, characterized in that: The welded structural component (3) is an aluminum-copper structural component, with the end facing the cable aluminum cylinder (2) being an aluminum structural component and the end facing the flange interface (1) being a copper structural component.

6. The connection structure between the cable metal sheath and the terminal tail tube according to claim 1, characterized in that: The clamp (4) is formed by combining two semi-circular plates into a cylindrical body. The diameter of the clamp (4) fitted onto the cable aluminum cylinder (2) and the flange interface (1) is larger than the diameter of the cable aluminum cylinder (2) and the flange interface (1), respectively.

7. The connection structure between the cable metal sheath and the terminal tail tube according to claim 1, characterized in that: The clamp (4) has several grooves (401) around its circumference. The grooves (401) are 1mm deep. After the clamps (4) are combined, they are laser welded and fixed into a cylindrical clamp (4) set on the surface of the flange interface (1) and the cable aluminum cylinder (2).

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