Cold contraction type terminal head of three-core cross-linked cable
Through multi-layer structural design and component optimization, the problems of insulation material aging and maintenance difficulties in the connection process of cold-shrinkable terminals of three-core cross-linked cables have been solved, achieving fast and reliable cable connection and improved insulation performance, adapting to power transmission in complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2026-03-27
AI Technical Summary
When connecting existing three-core cross-linked cable cold-shrink type terminals to external equipment, the welding process can easily lead to aging of the insulation material, making subsequent repair and replacement difficult and affecting the reliability and safety of the cable and equipment.
It adopts a multi-layer structure design, including a sealing layer, rubber insulation components, protective components, and quick-connect components. It uses the cooperation of slider rings and springs to achieve quick connection, and improves insulation performance through insulating rubber layer and nano-alumina layer. The umbrella skirt increases the creepage distance, and the protective sleeve provides mechanical protection.
It achieves fast and reliable connection, improves insulation strength and mechanical durability, reduces the failure rate of cable terminations, and adapts to the power transmission needs in complex environments.
Smart Images
Figure CN224053866U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to three core cross linking cable cold shrink type terminal head technical field especially relates to a three core cross linking cable cold shrink type terminal head. BACKGROUND
[0002] Three core cross linking cable cold shrink type terminal head is a kind of extremely important device for the connection of three core cross linking cable and external equipment, and is widely used in power transmission and distribution system. It is mainly designed for three core cross linking cable, and such cable has excellent electrical performance and mechanical performance by virtue of cross-linked polyethylene insulation material, and can efficiently transmit power.
[0003] At present, three core cross linking cable cold shrink type terminal head is usually connected with external equipment by welding, and the electrical connection performance of welding point is excellent, the resistance is small, the conductivity is good, the power loss can be effectively reduced, the connection strength is high, the connection point formed is almost integrated, is not easy to be loosened by external force, and the reliability is high, the sealing property of welding connection is good, foreign matter and moisture can be prevented from invading connection part, and insulation performance is improved.
[0004] Although the connection between terminal and external equipment is realized by welding, the connection is not easy to be loosened by external force, the reliability is high and the sealing property is good, but high temperature generated in welding process can cause cable insulation material to age and deform, reduce insulation performance, and if welding is improper, wire core can be damaged, and later maintenance and replacement are difficult, if welding point needs to be removed, cable and equipment can be irreversibly damaged, so a three core cross linking cable cold shrink type terminal head is proposed to solve the above problems. UTILITY MODEL CONTENTS
[0005] In order to make up for the above shortcomings, the utility model provides a three core cross linking cable cold shrink type terminal head, which aims at improving the problem that connection cannot be effectively realized without damaging port in prior art.
[0006] In order to realize the above purpose, the utility model adopts the following technical scheme:
[0007] A three core cross linking cable cold shrink type terminal head, comprising a plurality of sealing layers, a plurality of wire cores are fixedly connected in the inner side of the sealing layers, a plurality of terminals are fixedly connected at the end of the wire cores, a plurality of quick couplings are arranged on the outer side of the terminals, a plurality of protection assemblies are arranged in the inner side of the sealing layers, and a plurality of rubber insulation assemblies are arranged on the outer side of the wire cores.
[0008] The quick connector assembly comprises a clamping pipe arranged outside the terminal, a plurality of round blocks arranged inside the clamping pipe, a connecting block fixedly connected outside the end of the clamping pipe, a spring mounted on the side surface of the connecting block, the spring being sleeved outside the clamping pipe, a sliding block ring slidingly connected outside the clamping pipe and the plurality of round blocks, and the other end of the spring being fixedly connected to the side surface of the sliding block ring; and a limiting block is fixedly connected outside the end of the clamping pipe.
[0009] As a further description of the above technical solution:
[0010] The rubber insulation assembly comprises an insulating rubber layer fixedly connected to the outside of the core, and a nano-alumina layer arranged inside the insulating rubber layer.
[0011] As a further description of the above technical solution:
[0012] The protection assembly comprises a protective sleeve layer fixedly connected to the inside of the sealing layer, and a plurality of umbrella skirts arranged inside the protective sleeve layer.
[0013] As a further description of the above technical solution:
[0014] The end of each of the plurality of cores is provided with an outer semi-conductive layer, a semi-conductive band positioning step is fixedly connected to the side surface of each of the plurality of outer semi-conductive layers, a stress cone is fixedly connected to the outside of each of the plurality of semi-conductive band positioning steps and the plurality of outer semi-conductive layers, a clamping block is arranged outside each of the plurality of stress cones, and each of the plurality of clamping blocks is arranged inside the bottom of the protective sleeve layer.
[0015] As a further description of the above technical solution:
[0016] A sealing rubber ring is fixedly connected to the inside of each of the plurality of clamping blocks, an insulating tube is arranged inside each of the plurality of sealing rubber rings, and an insulating tube clamping sleeve is fixedly connected to the bottom of each of the plurality of insulating tubes.
[0017] As a further description of the above technical solution:
[0018] A connecting sheath is fixedly connected to the inside of each of the plurality of insulating tube clamping sleeves, a ground wire is arranged inside each end of the connecting sheath, an outer cable sheath is fixedly connected to the outside of each of the plurality of connecting sheaths, and a ground wire is also fixedly connected to the inside of each end of the bottom of the outer cable sheath.
[0019] As a further description of the above technical solution:
[0020] Each of the plurality of stress cones is arranged at the bottom of each of the plurality of insulating rubber layers.
[0021] As a further description of the above technical solution:
[0022] The plurality of filling rubbers are respectively arranged outside the plurality of end portions of the plurality of wire cores, and the plurality of protective sheath layers are respectively arranged outside the plurality of insulating rubber layers.
[0023] The utility model has the advantages of the following beneficial effects:
[0024] 1. In the utility model, the round block is clamped into the external equipment clamping groove by pushing the sliding block ring to compress the spring, the connection process is simple and fast, the operation efficiency of the cable and the external equipment connection is greatly improved, the installation time is reduced, and the utility model is suitable for scenes requiring frequent connection or emergency repair. After the spring resets, the round block is limited, the limiting block limits the sliding range of the sliding block ring, the connection loosening can be effectively prevented, the electrical connection can always be kept stable under complex working conditions such as long-term operation and vibration, and uninterrupted power transmission is ensured.
[0025] 2. In the utility model, the insulating rubber layer is used as the main insulating medium, combined with the inner nanometer aluminum oxide layer, the overall insulation strength is greatly improved, the current leakage is effectively blocked, and the power transmission demand of a higher voltage grade can be adapted. The good heat dissipation characteristics of nanometer aluminum oxide help to quickly dissipate the heat generated by the wire core, avoid the wire core from accelerating insulation aging due to overheating, and prolong the service life of the cable terminal head.
[0026] 3. In the utility model, the protective sheath layer provides a solid physical barrier for the internal structure, can resist the collision, scratching and mechanical damage of external objects, reduces the damage of internal components caused by external force, and enhances the durability of the terminal head in complex environments. The increase of the umbrella skirt increases the creepage distance, effectively suppresses the occurrence of pollution flashover, and ensures the normal operation of the terminal head in a dirty environment such as an industrial plant, a coastal area and the like, reduces power failure accidents caused by pollution flashover, and improves the stability of the power system. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 A three-core cross-linked cable cold shrink type terminal head is provided for the utility model;
[0028] Figure 2 A three-core cross-linked cable cold shrink type terminal head is provided for the utility model;
[0029] Figure 3 A three-core cross-linked cable cold shrink type terminal head is provided for the utility model;
[0030] Figure 4 A three-core cross-linked cable cold shrink type terminal head is provided for the utility model;
[0031] Figure 5A structure schematic view of the umbrella skirt of the three-core cross-linked cable cold shrink type terminal head is provided in the utility model.
[0032] Figure 6 A structure schematic view of the round block of the three-core cross-linked cable cold shrink type terminal head is provided in the utility model.
[0033] Legend:
[0034] 1, sealing layer, 2, connecting block, 3, protective sheath layer, 4, clamping block, 5, insulating tube, 6, insulating tube clamping sleeve, 7, cable outer sheath, 8, ground wire, 9, connecting sheath, 10, terminal, 11, wire core, 12, umbrella skirt, 13, stress cone, 14, semi-conductive layer positioning step, 15, sealing rubber ring, 16, limiting block, 17, outer semi-conductive layer, 18, insulating rubber layer, 19, nano alumina layer, 20, filling glue, 21, clamping tube, 22, spring, 23, round block, 24, sliding block ring. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.
[0036] With reference to Figure 1 and Figure 6 An embodiment provided by the utility model: a three-core cross-linked cable cold shrink type terminal head, comprising a plurality of sealing layers 1, the inner side of the plurality of sealing layers 1 is fixedly connected with wire cores 11, the end of the plurality of wire cores 11 is fixedly connected with terminals 10, the outer side of the plurality of terminals 10 is provided with quick connector assemblies, the inner side of the plurality of sealing layers 1 is provided with protective assemblies, and the outer side of the plurality of wire cores 11 is provided with rubber insulation assemblies.
[0037] The quick connector assembly comprises a clamping pipe 21 arranged outside the terminal 10, a plurality of round blocks 23 arranged inside the clamping pipe 21, a connecting block 2 fixedly connected to the outer side of the end portion of the clamping pipe 21, a spring 22 mounted on the side surface of the connecting block 2, the spring 22 being sleeved outside the clamping pipe 21, a sliding block ring 24 being slidably connected to the outer side of the clamping pipe 21 and the plurality of round blocks 23, the other end of the spring 22 being fixedly connected to the side surface of the sliding block ring 24, and a limiting block 16 fixedly connected to the outer side of the end portion of the clamping pipe 21. The clamping pipe 21 is sleeved outside the terminal 10. When the connection operation is to be performed, the sliding block ring 24 is pushed to slide along the clamping pipe 21 against the elastic force of the spring 22. This action enables the round blocks 23 to be smoothly clamped into the corresponding clamping grooves of the external device. After the connection is completed, the sliding block ring 24 is loosened, and after the spring 22 is reset, the sliding block ring 24 is pulled back to the original position, thereby limiting the round blocks 23, preventing the connection from loosening. The limiting block 16 further limits the sliding range of the sliding block ring 24, ensuring the stability of the entire connection structure.
[0038] With reference to Figure 2 , Figure 4 and Figure 5 , the rubber insulation assembly comprises an insulating rubber layer 18 fixedly connected to the outer side of the wire core 11, the insulating rubber layer 18 being tightly wrapped outside the wire core 11, serving as the main insulating material, which can effectively prevent current leakage and ensure the safety of power transmission. The insulating rubber layer 18 is provided with a nano-aluminum oxide layer 19 on the inner side. The nano-aluminum oxide layer 19 is arranged on the inner side of the insulating rubber layer 18. The nano-aluminum oxide has good insulation and heat dissipation performance, which can further improve the insulation strength of the insulating rubber layer 18 and help dissipate the heat generated by the wire core 11 during operation, reducing the risk of insulation performance degradation due to overheating. The protection assembly comprises a protective sleeve layer 3 fixedly connected to the inner side of the sealing layer 1, the protective sleeve layer 3 being fixed to the inner side of the sealing layer 1 to provide mechanical protection for each component inside the terminal head, preventing damage to the internal structure caused by collision, scratching and other external objects. The protective sleeve layer 3 is provided with a plurality of umbrella skirts 12 on the inner side. The plurality of umbrella skirts 12 on the inner side of the protective sleeve layer 3 increase the creepage distance, which can effectively prevent the occurrence of pollution flashover, especially in humid and dirty environments, ensuring the normal operation of the terminal head.
[0039] With reference to Figure 2 and Figure 3, a plurality of outer semi-conductive layers 17 are arranged at the bottom side of the end of the plurality of wire cores 11, a plurality of semi-conductive positioning steps 14 are fixedly connected to the side of the plurality of outer semi-conductive layers 17, a plurality of stress cones 13 are fixedly connected to the outer side of the plurality of semi-conductive positioning steps 14 and the plurality of outer semi-conductive layers 17, a plurality of clamping blocks 4 are arranged at the outer side of the plurality of stress cones 13, and the plurality of clamping blocks 4 are arranged at the inner bottom side of the protective sleeve layer 3. The outer semi-conductive layer 17 and the semi-conductive positioning step 14 at the bottom side of the end of the wire core 11 work in cooperation with the stress cone 13. The outer semi-conductive layer 17 and the semi-conductive positioning step 14 can improve the electric field distribution at the end of the cable, and the stress cone 13 can further uniform the electric field, reduce the concentration degree of the electric field, prevent insulation breakdown caused by the concentration of the electric field, and thus improve the insulation performance and reliability of the terminal head. The inner side of the plurality of clamping blocks 4 is fixedly connected with a sealing rubber ring 15, the inner side of the plurality of sealing rubber rings 15 is provided with an insulating tube 5, and the bottom of the plurality of insulating tubes 5 is fixedly connected with an insulating tube clamping sleeve 6. The sealing rubber ring 15 is installed at the inner side of the clamping block 4 and tightly cooperates with the insulating tube 5 to prevent impurities such as water and dust from entering the inside of the terminal head, and to protect the internal electrical components and insulation structure from the influence of the external environment.
[0040] With reference to Figure 1 , Figure 2 and Figure 3 , the inner side of the plurality of insulating tube clamping sleeves 6 is fixedly connected with a connecting sheath 9, the inner side of both ends of the plurality of connecting sheaths 9 is provided with a ground wire 8, the outer side of the plurality of connecting sheaths 9 is fixedly connected with a cable outer sheath 7, and the inner side of both ends of the bottom of the cable outer sheath 7 is also fixedly connected with a ground wire 8. The ground wire 8 at the inner side of the connecting sheath 9 and the cable outer sheath 7 provides the terminal head with grounding protection. When the cable or the terminal head has a leakage fault, the ground wire 8 can lead the current to the ground to avoid electric shock and equipment damage, and to ensure the safe operation of the power system.
[0041] With reference to Figure 2 , Figure 3 and Figure 4 , the plurality of stress cones 13 are arranged at the bottom side of the plurality of insulating rubber layers 18. The stress cone 13 can optimize the electric field distribution. The electric field is easy to concentrate at the cable terminal, the stress cone 13 can guide the electric field lines to make the electric field distribution more uniform, reduce the peak value of the electric field intensity, and avoid the aging, partial discharge or breakdown of the insulating rubber layer 18 caused by the concentration of the electric field, thereby cooperating with the insulating rubber layer 18 to ensure the insulation reliability. The side of the plurality of insulating rubber layers 18 is fixedly connected with a filling glue 20, and the plurality of filling glues 20 are arranged at the outer side of the end of the plurality of wire cores 11. The filling glue 20 is filled at the outer side of the end of the wire core 11 to further enhance the sealing effect, and also has a buffering effect to reduce the damage to the wire core 11 caused by external force impact. The plurality of protective sleeve layers 3 are arranged at the outer side of the plurality of insulating rubber layers 18. The protective sleeve layer 3 provides mechanical protection and withstands external force impact to prevent the insulating rubber layer 18 from being damaged.
[0042] Working principle: when the terminal needs to be quickly connected with external equipment, first push the sliding block ring 24, the sliding block ring 24 compresses the spring 22 and slides along the clamping pipe 21, so that the round block 23 can be clamped into the corresponding clamping groove of the external equipment. After the connection is completed, the elastic force of the spring 22 resets the sliding block ring 24, which limits the round block 23 and prevents the connection from loosening. The limiting block 16 limits the sliding range of the sliding block ring 24, ensuring the stability of the structure.
[0043] The insulating rubber layer 18 directly wraps the outer side of the wire core 11, serving as the main insulating medium to prevent current leakage. The nano-alumina layer 19 is arranged on the inner side of the insulating rubber layer 18. Nano-alumina has good insulation and heat dissipation properties, which can further improve the insulation effect of the insulating rubber layer 18, and help dissipate the heat generated by the wire core 11, reducing the risk of insulation performance degradation due to overheating. The filling glue 20 fills the outer side of the end of the wire core 11, serving as a seal and buffer. It can fill the gap between the wire core 11 and the insulating rubber layer 18, preventing moisture and impurities from entering, and at the same time, when the cable is subjected to external force impact, it serves as a buffer to protect the wire core 11 and the insulation structure.
[0044] The protective sleeve layer 3 is fixed on the inner side of the sealing layer 1, providing mechanical protection for the internal structure and preventing external objects from damaging the terminal head. The umbrella skirt 12 is arranged on the inner side of the protective sleeve layer 3, increasing the creepage distance and effectively preventing the occurrence of pollution flashover, improving the operation reliability of the terminal head in harsh environments.
[0045] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application shall be included in the protection scope of the present application.
Claims
1. A cold shrink type terminal head for a three-core crosslinked cable comprising a plurality of sealing layers (1), characterized in that: Multiple sealing layers (1) are fixedly connected to the inner side of each wire core (11), multiple wire cores (11) are fixedly connected to the end of each wire core (11), multiple terminals (10) are provided on the outer side of each terminal (10), multiple sealing layers (1) are provided with protective components, and multiple wire cores (11) are provided with rubber insulation components. The quick connector assembly includes a snap-fit tube (21), which is disposed on the outside of the terminal (10). Multiple round blocks (23) are disposed on the inside of the snap-fit tube (21). A connecting block (2) is fixedly connected to the outside of the end of the snap-fit tube (21). A spring (22) is installed on the side of the connecting block (2). The spring (22) is sleeved on the outside of the snap-fit tube (21). A slider ring (24) is slidably connected to the outside of the snap-fit tube (21) and the multiple round blocks (23). The other end of the spring (22) is fixedly connected to the side of the slider ring (24). A limit block (16) is fixedly connected to the outside of the end of the snap-fit tube (21).
2. A cold shrinkable termination for a three-core crosslinked cable according to claim 1, characterised in that: The rubber insulation assembly includes an insulating rubber layer (18), which is fixedly connected to the outside of the wire core (11), and a nano-alumina layer (19) is provided on the inside of the insulating rubber layer (18).
3. A cold shrink termination for a three core crosslinked cable according to claim 2, characterised in that: The protective component includes a protective sleeve (3), which is fixedly connected to the inner side of the sealing layer (1), and a plurality of umbrella skirts (12) are provided on the inner side of the protective sleeve (3).
4. A cold shrink termination for a three core crosslinked cable according to claim 3, characterised in that: Each of the multiple cores (11) has an outer semiconductive layer (17) on its bottom side. Each of the multiple outer semiconductive layers (17) has a semiconductive strip positioning step (14) fixedly connected to its side. Each of the multiple semiconductive strip positioning steps (14) and the multiple outer semiconductive layers (17) has a stress cone (13) fixedly connected to its outer side. Each of the multiple stress cones (13) has a snap-fit block (4) on its outer side. Each of the multiple snap-fit blocks (4) is located on the bottom inner side of the protective sleeve layer (3).
5. A cold shrink termination for a three core crosslinked cable according to claim 4, characterised in that: Each of the multiple snap-fit blocks (4) has a sealing rubber ring (15) fixedly connected to its inner side, and each of the multiple sealing rubber rings (15) has an insulating tube (5) fixedly connected to its inner side, and each of the multiple insulating tubes (5) has an insulating tube snap-fit sleeve (6) fixedly connected to its bottom.
6. A cold shrink termination for a three core crosslinked cable according to claim 5, characterised in that: Each of the multiple insulating pipe clamps (6) has a connecting sleeve (9) fixedly connected to its inner side. Each of the multiple connecting sleeves (9) has a ground wire (8) fixedly connected to its inner side at both ends. Each of the multiple connecting sleeves (9) has a cable outer sheath (7) fixedly connected to its outer side. Each of the two bottom ends of the cable outer sheath (7) also has a ground wire (8) fixedly connected to its inner side.
7. A cold shrinkable termination for a three core crosslinked cable according to claim 4, characterised in that: Multiple stress cones (13) are respectively disposed on the bottom side of multiple insulating rubber layers (18).
8. A cold shrinkable termination for a three core crosslinked cable according to claim 3, characterised in that: Each of the multiple insulating rubber layers (18) has a filler (20) fixedly connected to its side. The multiple fillers (20) are respectively disposed on the outer side of the ends of the multiple wire cores (11). The multiple protective sleeves (3) are respectively disposed on the outer side of the multiple insulating rubber layers (18).