A new cable accessory connection structure

Abstract

The application relates to a novel cable accessory connecting structure, which belongs to the technical field of cable systems and is used for connecting between a cable metal sheath and a cable accessory metal shell. A coaxial sleeve is arranged on the cable metal sheath, and the coaxial sleeve comprises an electrical connecting part and a waterproof part. The electrical connecting part is used for providing an electrical connecting channel between the cable metal sheath and the cable accessory metal shell, and the waterproof part is used for guaranteeing the waterproof performance between the cable outer sheath and the cable accessory metal shell. The electrical connecting part comprises a conductive layer and a spiral supporting belt arranged in the conductive layer. The electrical connecting part is spirally wound on the exposed cable metal sheath. Under the action of the spiral supporting belt pressure, the conductive layer is kept in abutting contact with the outer wall of the cable metal sheath and the inner wall of the cable accessory metal shell. The application has the effect of reducing the influence of external factors on the electrical continuity and waterproof performance between the cable metal sheath and the cable accessory metal shell.

Description

Technical Field

[0001] This application relates to the technical field of cable systems, and in particular to a novel cable accessory connection structure. Background Technology

[0002] Power cable accessories are products that connect cables to power transmission and distribution lines and related power distribution equipment. They generally refer to intermediate and terminal connections of various cables in a cable line, forming the power transmission network together with the cables. In related technologies, lead sealing is typically used to ensure the electrical connection and waterproofing performance between the cable's metal sheath and the metal shell of the cable accessory.

[0003] In practice, it was found that the lead sealing process requires open flame operation on site, which not only requires sufficient safe operating space, but also makes the sealing effect susceptible to the influence of rain, strong winds, or low temperatures, making it difficult to guarantee the quality of the lead sealing. Secondly, the lead sealing process is complex and highly dependent on the skill level and experience of the operators, resulting in differences in the quality of lead sealing performed by different operators at different times. In addition, during long-term operation of cables, under the influence of forces such as thermal expansion and contraction, vibration, and foundation settlement, defective lead sealing points may become the source of failure. The connection between the cable metal sheath and the cable accessory hardware may also shift, causing the lead seal to crack due to its inability to withstand external forces, or to peel off from the cable metal sheath, thus losing its electrical connection and waterproof function, and causing operational failure. Summary of the Invention

[0004] In order to reduce the impact of external factors on the electrical continuity and waterproof performance between the cable metal sheath and the cable accessory metal shell, this application provides a novel cable accessory connection structure.

[0005] The novel cable accessory connection structure provided in this application adopts the following technical solution: A novel cable accessory connection structure is disclosed for connecting a cable metal sheath and a cable accessory metal shell. An outer cable sheath is coaxially fitted onto the cable metal sheath, with a portion of the cable metal sheath exposed outside the outer cable sheath. The structure includes an electrical connection component and a waterproof component. The electrical connection component provides an electrical connection channel between the cable metal sheath and the cable accessory metal shell, while the waterproof component ensures waterproof performance between the cable outer sheath and the cable accessory metal shell. The electrical connection component is arranged in a flexible tubular shape. The electrical connection component includes a conductive layer and a spiral support strip disposed within the conductive layer. The electrical connection component is spirally wound around the exposed metal sheath of the cable. Under the pressure of the spiral support strip, the conductive layer remains in a tight abutment against the outer wall of the metal sheath of the cable and the inner wall of the metal shell of the cable accessory.

[0006] By adopting the above technical solution, this application separates the electrical continuity and waterproof performance that need to be considered when connecting the cable metal sheath and the cable accessory metal shell into two independent structures. The spiral support belt provides stable electrical contact pressure during the connection process between the cable accessory metal shell and the cable metal sheath, while the conductive layer provides a good low impedance channel, ensuring that the electrical transmission is efficient and stable after the cable accessory metal shell and the cable metal sheath are connected, and is not prone to overheating or failure due to excessive contact resistance.

[0007] Preferably, the waterproof component includes a sealing ring and a locking cap for locking the sealing ring. The sealing ring is fitted onto the cable outer sheath near the break point of the cable metal sheath. The locking cap is located on the side of the sealing ring away from the break point of the cable outer sheath. After the cable accessory metal shell is fitted, the end face of the sealing ring away from the cable outer sheath abuts against the inner wall of the cable accessory metal shell. The outer wall of the cable accessory metal shell is provided with a fixing external thread, and the inner wall of the locking cap is provided with a fixing internal thread that mates with the fixing external thread.

[0008] By adopting the above technical solution, the sealing ring is squeezed by the cooperation of the fixing internal thread on the locking cover and the fixing external thread on the metal shell of the cable accessory, so that it further abuts against the inner wall of the metal shell of the cable accessory. While improving the waterproof performance, it also increases the pressure between the sealing ring and the outer sheath of the cable, making it less likely for the sealing ring to shift relative to the cable.

[0009] Preferably, the waterproof component further includes a clamping ring, which is coaxially arranged with the locking cover. When the locking cover is fixed to the cable accessory metal shell, the end of the cable accessory metal shell is located between the locking cover and the clamping ring. The end of the clamping ring away from the sealing ring abuts against the inner wall of the locking cover. Guide surfaces are provided on both sides of the sealing ring in the width direction. The clamping ring is provided with a clamping surface that mates with the guide surfaces. The cable accessory metal shell is provided with a connecting surface that mates with the guide surfaces. The guide surface of the sealing ring abuts against the corresponding clamping surface and connecting surface.

[0010] By adopting the above technical solution, the clamping ring strengthens the connection between the cable accessory metal shell and the locking cover to a certain extent. During the installation of the locking cover, the clamping ring can squeeze the sealing ring, causing it to deform. This allows the sealing ring to fit tightly against the surface of the cable outer sheath and the inner wall of the cable accessory metal shell, providing effective waterproof protection for the break in the cable outer sheath.

[0011] Preferably, the end of the clamping ring opposite to the locking cover is provided with a guide arc surface, which provides clearance for the sliding of the metal shell end of the cable accessory toward the locking cover.

[0012] By adopting the above technical solution, the guide arc surface provides clearance for the sliding of the end of the cable accessory metal shell toward the locking cover, thereby facilitating the control of the locking cover to move until the cable accessory metal shell is embedded between the locking cover and the clamping ring.

[0013] Preferably, the sealing ring is integrally vulcanized from a rubber composite material under high temperature and high pressure.

[0014] By adopting the above technical solution, the sealing ring has the characteristics of oil resistance, acid and alkali resistance, solvent resistance, high temperature resistance, and high resilience. Even under long-term compression in harsh environments, it can maintain its inherent properties and ensure long-term waterproof performance.

[0015] Preferably, there is a gap between the clamping ring and the locking cover and the outer sheath of the cable.

[0016] By adopting the above technical solution and setting the gap, it is easy to control the sliding of the locking cover on the outer sheath of the cable, thereby making it easier to control the movement of the locking cover to be fixed with the metal shell of the cable accessory.

[0017] Preferably, the conductive layer is a copper braided strip, and both ends of the conductive layer are provided with clamping terminals.

[0018] By adopting the above technical solutions, copper braided tape not only has excellent conductivity and flexibility, making it compatible with cable metal sheaths of different specifications, but also has stable connection and low contact resistance, ensuring the long-term stability of electrical connections.

[0019] Preferably, the spiral support strip is formed by winding a titanium alloy strip at high temperature.

[0020] By adopting the above technical solutions, the spiral support belt has the characteristics of being non-magnetic, high temperature resistant, corrosion resistant, and highly resilient, which can provide long-term reliable contact pressure for electrical connections.

[0021] Preferably, the cable metal sheath includes a spiral groove, and the electrical connection component abuts against the inner wall of the spiral groove.

[0022] By adopting the above technical solution, the spiral groove provides positioning for the winding of electrical connection components, making it less likely for the electrical connection components to shift relative to the cable metal sheath, thus ensuring the reliability of the electrical connection components winding on the cable metal sheath. On the other hand, it increases the contact area between the electrical connection components and the cable metal sheath, further ensuring the electrical continuity after the cable accessory metal shell and the cable metal sheath are connected.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The locking cap, clamping ring, sealing ring, conductive layer and spiral support strip mentioned in the novel cable accessory connection structure mentioned in this application can all be prefabricated in the factory. On-site installation is only required. The operation process is simple and reliable, and is not affected by the environment or the construction quality of the construction personnel. It reduces the impact of external factors on the electrical continuity and waterproof performance between the cable metal sheath and the cable accessory metal shell, greatly shortens the construction time, reduces the construction difficulty, and effectively improves the construction quality. 2. The electrical connection components and waterproof components used in the connection between the metal shell of cable accessories and the metal sheath of cables in this application are all flexible connections. They have a strong self-adjustment capability under external force and always maintain good electrical connection and waterproof function. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.

[0025] Figure 2 This is a cross-sectional view of the metal shell and locking cover of the cable accessory in an embodiment of this application.

[0026] Figure 3 This is a detailed diagram of the electrical connection components in the embodiments of this application.

[0027] Figure 4 This is a schematic diagram of the electrical connection components in the embodiments of this application.

[0028] Figure 5 yes Figure 4 Enlarged view of part A in the image.

[0029] Explanation of reference numerals in the attached drawings: 1. Cable body; 11. Cable metal sheath; 111. Spiral groove; 12. Cable outer sheath; 2. Electrical connection component; 21. Conductive layer; 22. Spiral support strip; 23. Crimping terminal; 3. Waterproof component; 31. Locking cover; 32. Sealing ring; 321. Guide surface; 33. Crimping ring; 331. Crimping surface; 332. Guide arc surface; 4. Cable accessory metal shell; 41. Connection surface. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a novel cable accessory connection structure, referring to... Figure 1 and Figure 2This is used for the connection between the cable's metal sheath and the cable accessory's metal shell 4. The cable includes a cable body 1, a cable metal sheath 11, and a cable outer sheath 12, arranged coaxially from the inside out. During cable breakage, the longest cable body 1 needs to be retained, followed by the cable metal sheath 11, and the shortest cable outer sheath 12. Therefore, part of the cable metal sheath 11 is exposed outside the cable outer sheath 12. The novel cable accessory connection structure includes an electrical connection component 2 and a waterproof component 3. This application separates the electrical continuity and waterproof performance that need to be considered when connecting the cable metal sheath 11 and the cable accessory's metal shell 4 into two independent structures. The electrical connection component 2 is used to provide an electrical connection channel between the cable metal sheath 11 and the cable accessory's metal shell 4, and the waterproof component 3 is used to ensure the waterproof performance between the cable outer sheath 12 and the cable accessory's metal shell 4.

[0032] Reference Figure 2 and Figure 3 The electrical connection component 2 is arranged in a flexible tubular shape. The electrical connection component 2 includes a conductive layer 21 and a spiral support strip 22 disposed within the conductive layer 21. The electrical connection component 2 is spirally wound around the exposed cable metal sheath 11. Here, the exposed cable metal sheath 11 refers to the part of the cable metal sheath 11 located outside the cable outer sheath 12. After the cable accessory metal shell 4 is fitted, the electrical connection component 2 is squeezed by the cable accessory metal shell 4, so that the conductive layer 21 remains in a tight state against the outer wall of the cable metal sheath 11 and the inner wall of the cable accessory metal shell 4 under the pressure of the spiral support strip 22. The spiral support strip 22 provides stable electrical contact pressure during the connection process between the cable accessory metal shell 4 and the cable metal sheath 11, while the conductive layer 21 provides a good low impedance channel, ensuring that the electrical transmission is efficient and stable after the cable accessory metal shell 4 and the cable metal sheath 11 are connected, and is not prone to overheating or failure due to excessive contact resistance.

[0033] Reference Figure 2 and Figure 4 The cable metal sheath 11 includes a spiral groove 111. The electrical connection component 2 abuts against the inner wall of the spiral groove 111. The winding of the electrical connection component 2 is carried out along the spiral groove 111. The spiral groove 111 is built into the cable metal sheath 11 and does not require any modification to the cable itself. The spiral groove 111 provides positioning for the winding of the electrical connection component 2, making it less likely for the electrical connection component 2 to shift relative to the cable metal sheath 11, thus ensuring the reliability of the electrical connection component 2 winding on the cable metal sheath 11. On the other hand, it increases the contact area between the electrical connection component 2 and the cable metal sheath 11, further ensuring the electrical continuity after the cable accessory metal shell 4 is connected to the cable metal sheath 11.

[0034] Reference Figure 3The spiral support strip 22 is formed by winding titanium alloy strip at high temperature, giving it non-magnetic, high-temperature resistant, corrosion-resistant, and high-resilience properties. A 50% compression ratio test was conducted on the spiral support strip 22. Even under prolonged alternating hot and cold environments (-20℃ to 300℃), the spiral support strip 22 maintained its original resilience, providing long-term reliable contact pressure for electrical connections. The conductive layer 21 is a copper braided strip. After fitting the copper braided strip onto the spiral support strip 22, it is tightened to ensure a tight fit. Then, clamping terminals 23 are installed at both ends of the copper braided strip, completing the assembly of the electrical connection component 2. This facilitates operation. The copper braided strip not only possesses excellent conductivity and flexibility, adapting to different specifications of cable metal sheaths 11, but also features stable connection and low contact resistance, ensuring long-term stability of the electrical connection.

[0035] Reference Figure 4 and Figure 5 The waterproof component 3 includes a sealing ring 32 and a locking cap 31 for locking the sealing ring 32. The sealing ring 32 is fitted onto the cable outer sheath 12 near the break point of the cable metal sheath 11. The locking cap 31 is located on the side of the sealing ring 32 away from the break point of the cable metal sheath 11, so that the outer wall of the cable accessory metal shell 4 has a fixing external thread, and the inner wall of the locking cap 31 has a fixing internal thread that mates with the fixing external thread. After the cable accessory metal shell 4 is fitted, the end face of the sealing ring 32 away from the cable outer sheath 12 abuts against the inner wall of the cable accessory metal shell 4. Then, through the engagement of the fixing internal thread on the locking cap 31 and the fixing external thread on the cable accessory metal shell 4, the sealing ring 32 is squeezed, making it further abut against the inner wall of the cable accessory metal shell 4. While improving the waterproof performance, it also increases the pressure between the sealing ring 32 and the cable outer sheath 12, making it less likely for the sealing ring 32 to shift relative to the cable.

[0036] The sealing ring 32 in this application is integrally vulcanized from rubber composite material under high temperature and high pressure. It has the characteristics of oil resistance, acid and alkali resistance, solvent resistance, high temperature resistance and high resilience. Even under long-term compression in harsh environments, it can maintain its inherent properties and ensure long-term waterproof performance.

[0037] Reference Figure 5The waterproof component 3 also includes a clamping ring 33. The sealing ring 32 has guide surfaces 321 on both sides in the width direction. The clamping ring 33 has a clamping surface 331 that mates with the guide surfaces 321. The cable accessory metal shell 4 has a connecting surface 41 that mates with the guide surfaces 321. After the locking cover 31 is fixed to the cable accessory metal shell 4, the end of the cable accessory metal shell 4 is located between the locking cover 31 and the clamping ring 33. The end of the clamping ring 33 that is away from the sealing ring 32 is pressed against the inner wall of the locking cover 31. The clamping ring 33 strengthens the connection between the cable accessory metal shell 4 and the locking cover 31 to a certain extent. The guide surface 321 of the sealing ring 32 abuts against the corresponding pressing surface 331 and connecting surface 41. Through the setting of the pressing ring 33, the sealing ring 32 can be squeezed by the pressing ring 33 during the installation of the locking cover 31, so that the sealing ring 32 is squeezed and deformed. Then the sealing ring 32 is tightly attached to the surface of the cable outer sheath 12 and the inner wall of the cable accessory metal shell 4, providing effective waterproof protection for the break of the cable outer sheath 12. After testing, it can achieve the IP68 waterproof rating.

[0038] Reference Figure 3 and Figure 4 Both the clamping ring 33 and the locking cover 31 have gaps between themselves and the cable outer sheath 12. These gaps facilitate control over the sliding of the locking cover 31 on the cable outer sheath 12, thereby facilitating its movement until it is fixed to the cable accessory metal shell 4. The end of the clamping ring 33 facing away from the locking cover 31 has a guide arc surface 332. This guide arc surface 332 provides clearance for the sliding of the end of the cable accessory metal shell 4 towards the locking cover 31, thus facilitating control over the movement of the locking cover 31 until it is embedded between the locking cover 31 and the clamping ring 33.

[0039] The locking cap 31, clamping ring 33, sealing ring 32, conductive layer 21, and spiral support strip 22 mentioned in this application can all be prefabricated in the factory. On-site installation only requires assembly, making the process simple and reliable, unaffected by the environment or the quality of construction work. This reduces the impact of external factors on the electrical continuity and waterproof performance between the cable metal sheath 11 and the cable accessory metal shell 4, significantly shortening construction time and reducing construction difficulty while effectively improving construction quality. Furthermore, the structures used to achieve electrical continuity and waterproof performance are all flexible connections, possessing strong self-adjustment capabilities under external forces, maintaining good electrical connection and waterproof function at all times.

[0040] The implementation principle of a novel cable accessory connection structure in this application embodiment is as follows: during the connection process between the cable accessory metal shell 4 and the cable metal sheath 11, the locking cover 31 and the clamping ring 33 are first fitted onto the cable outer sheath 12, with the clamping ring 33 located at the end of the locking cover 31 near the break point of the cable outer sheath 12, and then the sealing ring 32 is installed at the break point of the cable outer sheath 12. After assembling the electrical connection component 2 according to the dimensions and length of the cable metal sheath 11, install the cable accessory metal shell 4. Control the cable accessory metal shell 4 to slide along the length of the cable until the connecting surface 41 on the cable accessory metal shell 4 is in contact with the guide surface 321 on the sealing ring 32. Then control the locking cover 31 to slide along the length of the cable outer sheath 12 until the pressing surface 331 on the pressing ring 33 is in contact with the guide surface 321 on the sealing ring 32. At this time, the end of the cable accessory metal shell 4 is embedded between the pressing ring 33 and the locking cover 31. Rotate the locking cover 31 to squeeze the sealing ring 32 and complete the installation.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel cable accessory connection structure for connecting a cable metal sheath (11) and a cable accessory metal shell (4), wherein a cable outer sheath (12) is coaxially sleeved on the cable metal sheath (11), and a portion of the cable metal sheath (11) is exposed outside the cable outer sheath (12), characterized in that, It includes an electrical connection component (2) and a waterproof component (3). The electrical connection component (2) is used to provide an electrical connection channel between the cable metal sheath (11) and the cable accessory metal shell (4). The waterproof component (3) is used to ensure the waterproof performance between the cable outer sheath (12) and the cable accessory metal shell (4). The electrical connection component (2) is arranged in a flexible tubular shape. The electrical connection component (2) includes a conductive layer (21) and a spiral support strip (22) disposed in the conductive layer (21). The electrical connection component (2) is spirally wound on the exposed cable metal sheath (11). Under the pressure of the spiral support strip (22), the conductive layer (21) is kept in a tight state against the outer wall of the cable metal sheath (11) and the inner wall of the cable accessory metal shell (4).

2. The novel cable accessory connection structure according to claim 1, characterized in that, The waterproof component (3) includes a sealing ring (32) and a locking cap (31) for locking the sealing ring (32). The sealing ring (32) is fitted onto the cable outer sheath (12) near the break point of the cable metal sheath (11). The locking cap (31) is located on the side of the sealing ring (32) away from the break point of the cable outer sheath (12). After the cable accessory metal shell (4) is fitted, the end face of the sealing ring (32) away from the cable outer sheath (12) abuts against the inner wall of the cable accessory metal shell (4). The outer wall of the cable accessory metal shell (4) is provided with a fixed external thread, and the inner wall of the locking cap (31) is provided with a fixed internal thread that engages with the fixed external thread.

3. The novel cable accessory connection structure according to claim 2, characterized in that, The waterproof component (3) also includes a clamping ring (33), which is coaxially arranged with the locking cover (31). When the locking cover (31) is fixed with the cable accessory metal shell (4), the end of the cable accessory metal shell (4) is located between the locking cover (31) and the clamping ring (33). The end of the clamping ring (33) away from the sealing ring (32) abuts against the inner wall of the locking cover (31). The sealing ring (32) has guide surfaces (321) on both sides in the width direction. The clamping ring (33) has a clamping surface (331) that cooperates with the guide surface (321). The cable accessory metal shell (4) has a connecting surface (41) that cooperates with the guide surface (321). The guide surface (321) of the sealing ring (32) abuts against the corresponding clamping surface (331) and connecting surface (41).

4. The novel cable accessory connection structure according to claim 3, characterized in that, The clamping ring (33) has a guide arc surface (332) at one end away from the locking cover (31), which provides clearance for the sliding of the end of the cable accessory metal shell (4) toward the locking cover (31).

5. The novel cable accessory connection structure according to claim 2, characterized in that, The sealing ring (32) is integrally vulcanized from rubber composite material under high temperature and high pressure.

6. The novel cable accessory connection structure according to claim 3, characterized in that, There is a gap between the clamping ring (33) and the locking cover (31) and the cable outer sheath (12).

7. The novel cable accessory connection structure according to claim 1, characterized in that, The conductive layer (21) is a copper braided strip, and both ends of the conductive layer (21) are provided with clamping terminals (23).

8. The novel cable accessory connection structure according to claim 1, characterized in that, The spiral support strip (22) is formed by winding a titanium alloy strip at high temperature.

9. The novel cable accessory connection structure according to claim 1, characterized in that, The cable metal sheath (11) includes a spiral groove (111), and the electrical connection component (2) abuts against the inner wall of the spiral groove (111).

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