Flame-retardant three-core cable cold shrinkage indoor terminal
By using cold shrink tubes and insulating protective sleeves made of highly elastic materials, the problem of intimate sealing of cold shrink tubes is solved, and efficient sealing and flame retardant protection of cable terminals is achieved, ensuring the safety and reliability of the cable in high-temperature environments.
Patent Information
- Application Number
- CN202421991162.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The cold shrink tube may not be tightly sealed during installation, causing high temperatures and flame to propagate rapidly along the gaps, reducing flame retardant performance.
The cold shrink tube and insulated protective sleeve made of highly elastic materials ensure that the cold shrink tube tightly wraps the cable surface, creating a uniform and seamless seal, and provides an additional fire barrier through the insulated protective sleeve.
It improves the sealing effect and flame retardant performance of cable terminals, limits flame propagation, protects internal components from high temperatures, and reduces construction difficulty and safety risks.
Smart Images
Figure CN223285575U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power transmission, in particular to a flame-retardant three-core cable cold-shrink indoor terminal. Background Art
[0002] The three-core cable cold shrink indoor terminal is a device used for cable connection, primarily consisting of cold shrink tubing, a terminal block, and a stress cone. This device uses cold shrink technology to tightly wrap the cold shrink tubing around the cable's insulation and outer sheath, ensuring insulation and sealing. The terminal block is secured to the cable's inner conductor by crimping or welding to achieve an electrical connection. The stress cone is installed at the junction between the cable's insulation and inner conductor to evenly distribute the electric field.
[0003] However, during the implementation of the above technical solution, at least the following technical problems were found:
[0004] During installation, cold shrink tubing needs to shrink from its expanded state onto the cable. If this process isn't done properly, the seal may not be tight enough. This is especially true at the ends of the tubing where it contacts the cable. Insufficient shrinkage or improper installation can leave tiny gaps. If the seal isn't tight enough, high temperatures and flames can spread rapidly along these gaps, reducing the overall flame retardancy. Utility Model Content
[0005] (1) Technical problems solved
[0006] To address the shortcomings of existing technologies, the present invention provides a flame-retardant three-core cable cold-shrink indoor terminal. This solves the problem of the cold-shrink tubing needing to be retracted from its expanded state onto the cable during installation. If this process is not done properly, the seal may not be tight enough. In particular, where the ends of the cold-shrink tubing contact the cable, insufficient contraction or improper installation may leave tiny gaps. If the seal is not tight enough, high temperatures and flames may spread rapidly along these gaps, thereby reducing the overall flame-retardant performance.
[0007] (2) Technical solution
[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:
[0009] A flame-retardant three-core cable cold-shrink indoor terminal includes a device body, a three-core cable device is arranged at the upper end of the device body, an inner conductor is arranged inside the three-core cable device, and the flame-retardant three-core cable cold-shrink indoor terminal is also provided with a cold shrink tube, a wiring terminal and a stress cone, an insulating protective sleeve and a silicone umbrella skirt. The end of the three-core cable device is located inside the device body and connected to the device body. The cold shrink tube is wrapped around the outside of the three-core cable device and extends from the middle of the three-core cable device to the position of the wiring terminal. The wiring terminal is arranged at the end of the three-core cable device and fixed on the inner conductor. The outer part of the wiring terminal is exposed outside the cold shrink tube.
[0010] Preferably, the stress cone is located between the three-core cable device and the terminal block, and is nested inside the cold shrink tube.
[0011] Preferably, the insulating protective sleeve covers the outside of the wiring terminal and the stress cone, and extends from the top end to the bottom end of the cold shrink tube.
[0012] Preferred: The cold shrink tube is made of highly elastic material, and the insulating protective sleeve has the performance of resistance to ultraviolet rays and mechanical impact.
[0013] Preferably, the silicone umbrella skirt is movably sleeved on the outer top of the cold shrink tube.
[0014] (3) Beneficial effects
[0015] 1. Cold shrink tubing, wrapped around the outside of the three-core cable assembly, is made of highly elastic materials with remarkable sealing and flame-retardant properties. These tubings are typically made of high-performance materials such as silicone rubber or EPDM. These materials not only have excellent elasticity and resilience, but also maintain structural integrity and durability in high-temperature environments. During the shrinking process, the tubing shrinks from its expanded state back to its original size, tightly wrapping around the cable to ensure a tight fit and form a uniform, seamless seal.
[0016] 2. The insulating sleeve covers the outside of the terminal block and stress cone, and is resistant to UV rays and mechanical impact. The insulating sleeve extends from the middle to the bottom of the cold shrink tube, not only providing electrical insulation, but also forming an additional fire barrier to protect internal components from direct effects of high temperatures and flames. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and to implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.
[0018] Figure 1 It is a structural diagram of the entire utility model;
[0019] Figure 2 For this utility model Figure 1 Schematic diagram of the enlarged structure at point A in the middle.
[0020] Legend: 11. Three-core cable assembly; 12. Cold shrink tubing; 13. Wiring terminal; 14. Stress cone; 15. Insulation protective sleeve; 16. Silicone shed; 17. Device body. DETAILED DESCRIPTION
[0021] The embodiment of the present application provides a flame-retardant three-core cable cold shrink indoor terminal, which effectively solves the problem that the cold shrink tube needs to be shrunk from an expanded state to the cable during the installation process. If this process is not done well, the seal may not be tight enough. In particular, at the position where the two ends of the cold shrink tube contact the cable, if the shrinkage force of the cold shrink tube is insufficient or it is improperly installed, a tiny gap may be left. If the seal is not tight enough, high temperature and flames may spread rapidly along the gap, thereby reducing the overall flame retardant performance. The cold shrink tube is wrapped around the outside of the three-core cable device and is made of highly elastic materials with significant sealing effects and flame retardant properties. These cold shrink tubes are usually made of high-performance silicone rubber or ethylene propylene rubber and other materials. These materials not only have excellent elasticity and recovery capabilities, but also can maintain structural integrity and durability in high temperature environments. During the cold shrink process, the cold shrink tube shrinks back to its original size from the expanded state and is tightly wrapped around the cable to ensure a close fit with the cable surface, forming a uniform and seamless seal.
[0022] Example
[0023] like Figure 1 and Figure 2 As shown, the technical solution in the embodiment of the present application effectively solves the problem that the cold shrink tube needs to be contracted from the expanded state to the cable during installation. If this process is not done well, the seal may not be tight enough. Especially at the position where the two ends of the cold shrink tube contact the cable, if the shrinkage force of the cold shrink tube is insufficient or it is installed improperly, a tiny gap may be left. If the seal is not tight enough, high temperature and flames may spread rapidly along the gap, thereby reducing the overall flame retardant performance. The overall idea is as follows:
[0024] In view of the problems existing in the prior art, the utility model provides a flame retardant three-core cable cold shrink indoor terminal, comprising a device body 17, a three-core cable device 11 is provided at the upper end of the device body 17, an inner conductor is provided inside the three-core cable device 11, the flame retardant three-core cable cold shrink indoor terminal is also provided with a cold shrink tube 12, a terminal 13 and a stress cone 14, an insulating protective sleeve 15 and a silicone umbrella skirt 16, the end of the three-core cable device 11 is located inside the device body 17 and is connected to the device body 17, the cold shrink tube 12 is wrapped around the outside of the three-core cable assembly 11, extending from the middle of the three-core cable assembly 11 to the location of the terminal block 13. The terminal block 13 is located at the end of the three-core cable assembly 11 and fixed to the inner conductor. The outer portion of the terminal block 13 is exposed outside the cold shrink tube 12. The stress cone 14 is located between the three-core cable assembly 11 and the terminal block 13 and is nested inside the cold shrink tube 12. The cold shrink tube 12 is wrapped around the outside of the three-core cable assembly 11 and is made of a highly elastic material, with significant sealing and flame retardant properties. These cold shrink tubes 12 are typically made of high-performance materials such as silicone rubber or ethylene propylene rubber. These materials not only have excellent elasticity and recovery capabilities, but also maintain structural integrity and durability in high-temperature environments.
[0025] The insulating protective sleeve 15 covers the outside of the terminal 13 and the stress cone 14, extending from the top to the bottom of the cold shrink tube 12. The cold shrink tube 12 is made of highly elastic material, and the insulating protective sleeve 15 has the performance of UV resistance and mechanical impact resistance. During the cold shrinkage process, the cold shrink tube 12 shrinks from the expanded state to its original size and tightly wraps around the cable to ensure a close fit with the cable surface to form a uniform and seamless seal.
[0026] Silicone sheds 16 are flexibly attached to the top of the cold shrink tubing 12. An insulating protective sleeve 15 covers the exterior of the terminal blocks 13 and stress cone 14, offering UV and mechanical impact resistance. Extending from the middle of the cold shrink tubing 12 to its lower end, the insulating protective sleeve 15 not only provides electrical insulation but also forms an additional fire barrier, protecting internal components from direct effects of heat and flames.
[0027] Working principle: The cold shrink tube 12 is wrapped around the outside of the three-core cable device 11 and is made of highly elastic material. It has a significant sealing effect and flame retardant properties. This sealing effect can effectively block the entry of air and moisture, thereby reducing the chance of oxygen supporting combustion and limiting the spread of flames inside the cable terminal. Highly elastic materials can form a carbonized protective layer in a fire or high-temperature environment, further blocking the flame and slowing down the burning rate of the internal material. This not only provides more time for emergency treatment, but also protects the conductors and insulation materials inside the cable and reduces thermal damage. Highly elastic cold shrink materials perform well in resisting environmental changes such as ultraviolet rays and humidity changes, ensuring the long-term reliability and flame retardant properties of the cold shrink tube under various environmental conditions. The installation process is simple, no heating equipment is required, and the cold shrink process can be completed manually, which greatly reduces the difficulty of construction and safety risks. After installation, the cold shrink tubing automatically adapts to irregularities in the cable surface, ensuring a long-term seal and flame-retardant properties. Through its superior material selection and design, the cold shrink tubing provides effective sealing and flame-retardant protection, significantly improving the safety and reliability of three-core cable installation termination systems under extreme conditions such as heat and fire. These cold shrink tubing 12 is typically made of high-performance materials such as silicone rubber or EPDM, which not only exhibit excellent elasticity and resilience but also maintain structural integrity and durability in high-temperature environments. During the shrinking process, the tubing 12 shrinks from its expanded state back to its original size, tightly wrapping around the cable to ensure a tight fit and form a uniform, seamless seal. The insulating protective sleeve 15 covers the exterior of the terminal block 13 and stress cone 14 and is resistant to UV rays and mechanical shock. Extending from the middle to the lower end of the cold shrink tubing 12, the insulating protective sleeve 15 not only provides electrical insulation but also forms an additional fire barrier, protecting internal components from the direct effects of heat and flames.
[0028] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all possible embodiments. However, any obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.
Claims
1. A flame-retardant three-core cable cold shrink indoor terminal, comprising a device body (17), a three-core cable device (11) being provided at the upper end of the device body (17), an inner conductor being provided inside the three-core cable device (11), characterized in that: The flame-retardant three-core cable cold shrink indoor terminal is also provided with a cold shrink tube (12), a connection terminal (13), a stress cone (14), an insulating protective sleeve (15) and a silicone shed (16); The end of the three-core cable device (11) is located inside the device body (17) and is connected to the device body (17); the cold shrink tube (12) is wrapped around the outside of the three-core cable device (11), and its position extends from the middle of the three-core cable device (11) to the position of the wiring terminal (13); the wiring terminal (13) is arranged at the end of the three-core cable device (11) and is fixed on the inner conductor; the outer part of the wiring terminal (13) is exposed outside the cold shrink tube (12).
2. A flame-retardant three-core cable cold-shrink indoor terminal according to claim 1, characterized in that: The stress cone (14) is located between the three-core cable device (11) and the connection terminal (13), and is nested inside the cold shrink tube (12).
3. The flame-retardant three-core cable cold-shrink indoor terminal according to claim 1, characterized in that: The insulating protective sleeve (15) covers the outside of the wiring terminal (13) and the stress cone (14), and extends from the top end of the cold shrink tube (12) to the bottom end.
4. The flame-retardant three-core cable cold-shrink indoor terminal according to claim 1, characterized in that: The cold shrink tube (12) is made of a highly elastic material; The insulating protective cover (15) has the properties of resistance to ultraviolet rays and mechanical impact.
5. The flame-retardant three-core cable cold-shrink indoor terminal according to claim 2, characterized in that: The silicone umbrella skirt (16) is movably sleeved on the outer top of the cold shrink tube (12).