Long-life power distribution cable terminal

Abstract

The invention discloses a long-life power distribution cable terminal, which comprises a terminal main body, a conductor terminal, a cold shrinkage sheath tube, a conductor sealing structure, a bottom sealing structure and a cable sealing structure, the top of the terminal main body is provided with a connecting part, the connecting part is connected with the conductor terminal, the bottom of the terminal main body is provided with an interface, the interface is connected with one end of the cold contraction sheath tube, and the other end of the cold contraction sheath tube is used for connecting a three-phase main cable; the conductor sealing structure is sleeved at the joint of the connecting part and the conductor terminal, the bottom sealing structure is sleeved at the joint of the interface and the cold shrink sheath tube, and the cable sealing structure is sleeved at the joint of the cold shrink sheath tube and the three-phase main cable. According to the invention, the conductor sealing structure, the bottom sealing structure and the cable sealing structure are correspondingly arranged at the joint of the terminal main body, the conductor terminal and the cold shrink sheath tube, comprehensive and high-strength protection is realized by means of multi-point sealing cooperation, the service life of the terminal is prolonged, and the operation safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution cables, and in particular to a long-life power distribution cable terminal. Background Art

[0002] As an important part of urban and industrial power supply, the 10kV distribution system undertakes a large number of power transmission tasks. At present, with the rapid increase in the number of distribution cables, transformer terminals at some transmission nodes are often prone to aging, corrosion, insulation degradation and other problems during use, resulting in a short service life and the need for frequent replacement, resulting in a large workload for operation and maintenance. In addition, once water enters the distribution cable terminal, it is easy to cause a safety accident. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a long-life distribution cable terminal, prolong the service life and improve the safety performance.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A long-life distribution cable terminal, comprising a terminal body, a conductor terminal, a cold shrink sheath tube, a conductor sealing structure, a bottom sealing structure and a cable sealing structure;

[0006] A connecting portion is provided on the top of the terminal body, the connecting portion is connected to the conductor terminal, an interface is provided on the bottom of the terminal body, the interface is connected to one end of the cold shrink sheath tube, and the other end of the cold shrink sheath tube is used to connect a three-phase main cable;

[0007] The conductor sealing structure is sleeved at the connection between the connecting part and the conductor terminal, the bottom sealing structure is sleeved at the connection between the interface and the cold shrink sheath tube, and the cable sealing structure is sleeved at the connection between the cold shrink sheath tube and the three-phase main cable.

[0008] The beneficial effects of the present invention are: providing a long-life distribution cable terminal, in which a conductor sealing structure, a bottom sealing structure and a cable sealing structure are correspondingly arranged at the connection between the terminal body, the conductor terminal and the cold shrink sheath tube, and multi-point sealing cooperation is relied on to achieve comprehensive and high-strength protection, thereby improving the overall hardware performance of the terminal, extending the service life and ensuring safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the composition structure of a long-life distribution cable terminal of the present invention;

[0010] Figure 2 It is a structural schematic diagram of a conductor sealing structure of a long-life distribution cable terminal of the present invention;

[0011] Figure 3 A schematic structural diagram of a bottom sealing structure of a long-life distribution cable terminal of the present invention;

[0012] Figure 4 It is a structural schematic diagram of a cable sealing structure of a long-life distribution cable terminal of the present invention;

[0013] Figure 5 A schematic diagram of the expansion of the terminal body of an existing long-life distribution cable terminal;

[0014] Figure 6 The present invention is a schematic diagram of the expansion of a terminal body of a long-life distribution cable terminal.

[0015] Description of labels:

[0016] 1. Terminal body; 2. Conductor terminal; 3. Cold shrink sheath tube; 4. Conductor sealing structure; 5. Bottom sealing structure; 6. Cable sealing structure; 7. Three-phase main cable; 8. Adapter; 9. Braided ground wire; 10. Steel wire; 13. Expander; 14. Telescopic expansion tube; 15. High-strength smooth soft mold; 16. Optical fiber; 17. Expansion strip;

[0017] 11. Connecting part; 12. Interface;

[0018] 41. Sealing tube; 42. First filling member; 43. First sealing member;

[0019] 51. first protective sleeve; 52. second sealing member;

[0020] 61. Second protective sleeve; 62. Second filling piece; 63. Third sealing piece. DETAILED DESCRIPTION

[0021] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0022] Please refer to Figures 1 to 6 , a long-life distribution cable terminal, comprising a terminal body 1, a conductor terminal 2, a cold shrink sheath tube 3, a conductor sealing structure 4, a bottom sealing structure 5 and a cable sealing structure 6;

[0023] A connecting portion 11 is provided at the top of the terminal body 1, and the connecting portion 11 is connected to the conductor terminal 2. An interface 12 is provided at the bottom of the terminal body 1, and the interface 12 is connected to one end of the cold shrink sheath tube 3. The other end of the cold shrink sheath tube 3 is used to connect the three-phase main cable 7.

[0024] The conductor sealing structure 4 is sleeved at the connection between the connecting part 11 and the conductor terminal 2, the bottom sealing structure 5 is sleeved at the connection between the interface 12 and the cold shrink sheath tube 3, and the cable sealing structure 6 is sleeved at the connection between the cold shrink sheath tube 3 and the three-phase main cable 7.

[0025] From the above description, it can be seen that the beneficial effects of the present invention are: a conductor sealing structure 4, a bottom sealing structure 5 and a cable sealing structure 6 are correspondingly arranged at the connection between the terminal body 1, the conductor terminal 2 and the cold shrink sheath 3, so that the terminal has multiple seals, realizes all-round and high-strength protection, improves the overall hardware performance of the terminal, prolongs the service life, and ensures safe operation.

[0026] Furthermore, the conductor sealing structure 4 includes a sealing tube 41 and a first filling member 42;

[0027] The sealing tube 41 has a first tube opening and a second tube opening which are in the same communication;

[0028] The conductor terminal 2 passes through the first pipe opening, and is connected to the connecting portion 11 passing through the second pipe opening in the sealing tube 41;

[0029] The first filling member 42 fills the gap between the inner wall of the sealing tube 41 and the conductor terminal 2 and the gap between the inner wall of the sealing tube 41 and the connecting portion 11 .

[0030] From the above description, it can be seen that when protecting the connection between the conductor terminal 2 and the connecting part 11, the sealing tube 41 provides external overall sealing protection, and then the first filling member 42 is used to fill the internal gap, which can not only prevent water from entering the terminal, but also delay the aging and corrosion of the connection, thereby improving the connection stability.

[0031] Furthermore, the conductor sealing structure 4 further includes a first sealing member 43;

[0032] The first sealing member 43 is disposed in the gap between the first pipe opening and the conductor terminal 2 and in the gap between the second pipe opening and the connecting portion 11 .

[0033] From the above description, it can be seen that on the basis of the sealing tube 41 and the first filling member 42, a first sealing member 43 is additionally provided to perform sealing treatment on the position located at the pipe opening, thereby improving the stability of the sealing structure and the protective effect.

[0034] Furthermore, a cold shrink sealing sleeve is provided on a surface of the first sealing member 43 facing the outside of the sealing tube 41 .

[0035] From the above description, it can be seen that the sealing tube 41, the first filling member 42 and the first sealing member 43 are used as the first sealing direction, and a cold shrink sealing sleeve is added as the second sealing direction, using multi-layer protection to prevent water from penetrating into the terminal from the pipe opening.

[0036] Further, the bottom sealing structure 5 includes a first protective sleeve 51 and a second sealing member 52;

[0037] The first protective sleeve 51 is sleeved on the connection between the interface 12 and the cold shrink sheath tube 3, and the end of the cold shrink sheath tube 3 is inserted into the interface 12. The second sealing member 52 is located inside the first protective sleeve 51, and the second sealing member 52 blocks the gap between the interface 12 and the end of the cold shrink sheath tube 3.

[0038] From the above description, it can be seen that after the interface 12 is connected to the cold shrink sheath tube 3, the second seal 52 is first used to seal the gap at the connection, and then the first protective sleeve 51 is used to wrap the entire connection and the second seal 52, so as to cooperate with the conductor sealing structure 4 to provide comprehensive and strict protection for the interior of the terminal body 1.

[0039] Furthermore, there are at least two interfaces 12 and at least two cold shrink sheath tubes 3 in one-to-one correspondence.

[0040] Further, the cable sealing structure 6 includes a second protective sleeve 61 and a second filling piece 62;

[0041] The second protective sleeve 61 is provided with a first sleeve opening and a second sleeve opening which are connected in the same manner. The end of the cold shrink sleeve tube 3 away from the terminal body 1 passes through the first sleeve opening and is connected to the three-phase main cable 7 passing through the second sleeve opening in the second protective sleeve 61. The second filling piece 62 is located in the gap between the inner side wall of the second protective sleeve 61 and the cold shrink sleeve tube 3.

[0042] From the above description, it can be seen that the second protective sleeve 61 is put on the connection between the cold shrink sheath tube 3 and the three-phase main cable 7, and the second filler 62 is used inside to fill the gap, thereby improving the sealing performance of the part connected to the three-phase main cable 7 and avoiding discharge failures caused by the entry of moisture into the terminal and the cable.

[0043] Furthermore, the cable sealing structure 6 further includes a third sealing member 63;

[0044] The third sealing member 63 is disposed in the gap between the first bushing opening and the cold shrinkable sheath tube 3 and in the gap between the second bushing opening and the three-phase main cable 7 .

[0045] From the above description, it can be seen that the third sealing member 63 blocks the gap between the sleeve opening and the cold shrink sheath tube 3, so that the cold shrink sheath tube 3 and the three-phase main cable 7 fit more closely, thereby enhancing the sealing effect.

[0046] Furthermore, the second protective sleeve 61 is also provided with a third sleeve port for accessing the optical fiber 16;

[0047] The third sealing member 63 is provided on the third sleeve opening.

[0048] From the above description, it can be seen that the third sleeve opening and the third sealing member 63 are provided to improve the sealing and waterproof performance of the optical cable, and realize the matching use of the optical fiber 16 and the cable on the terminal to meet the actual use requirements.

[0049] Furthermore, it also includes an adapter 8;

[0050] The other end of the cold shrink sheath tube 3 is connected to the three-phase main cable 7 through the adapter 8, and the adapter 8 is provided with a braided ground wire 9.

[0051] It can be seen from the above description that by arranging the adapter 8 externally, a foundation for installing the braided ground wire 9 is provided, which helps to achieve reliable grounding and prolong the service life of the terminal.

[0052] Please refer to Figures 1 to 6 , Embodiment 1 of the present invention is:

[0053] A long-life distribution cable terminal, such as Figure 1 As shown, it includes a terminal body 1, a conductor terminal 2, a cold shrink sheath tube 3, a conductor sealing structure 4, a bottom sealing structure 5 and a cable sealing structure 6; a connecting portion 11 is provided on the top of the terminal body 1, and the connecting portion 11 is connected to the conductor terminal 2; an interface 12 is provided on the bottom of the terminal body 1, and the interface 12 is connected to one end of the cold shrink sheath tube 3, and the other end of the cold shrink sheath tube 3 is used to connect a three-phase main cable 7; the conductor sealing structure 4 is sleeved at the connection between the connecting portion 11 and the conductor terminal 2, the bottom sealing structure 5 is sleeved at the connection between the interface 12 and the cold shrink sheath tube 3, and the cable sealing structure 6 is sleeved at the connection between the cold shrink sheath tube 3 and the three-phase main cable 7.

[0054] In this embodiment, if Figure 2As shown, the conductor sealing structure 4 includes a sealing tube 41, a first filling piece 42 and a first sealing piece 43; the sealing tube 41 has a first tube opening and a second tube opening that are connected to each other; the conductor terminal 2 passes through the first tube opening and is connected to the connecting portion 11 passing through the second tube opening in the sealing tube 41; the first filling piece 42 fills the gap between the inner side wall of the sealing tube 41 and the conductor terminal 2 and the gap between the inner side wall of the sealing tube 41 and the connecting portion 11. The first sealing piece 43 is provided in both the gap between the first tube opening and the conductor terminal 2 and the gap between the second tube opening and the connecting portion 11. A cold shrink sealing sleeve is provided on the surface of the first sealing piece 43 facing the outside of the sealing tube 41.

[0055] The first sealing member 43 is made of sealant; the sealant is tightly bonded to the conductor terminal 2 and the connecting portion 11 of the terminal body 1, and the gap between the first pipe opening and the conductor terminal 2 and the gap between the second pipe opening and the connecting portion 11 are sealed in a winding manner. The cold shrink seal sleeve is tightly bonded to the sealant to prevent moisture from entering the terminal conductive terminal and the terminal body 1.

[0056] In this embodiment, if Figure 3 As shown, the bottom sealing structure 5 includes a first protective sleeve 51 and a second sealing member 52; the first protective sleeve 51 is sleeved at the connection between the interface 12 and the cold shrink sheath tube 3, the end of the cold shrink sheath tube 3 is inserted into the interface 12, the second sealing member 52 is located in the first protective sleeve 51, and the second sealing member 52 blocks the gap between the interface 12 and the end of the cold shrink sheath tube 3.

[0057] The second sealing member 52 may be a waterproof sealing tape, which is wound between the interface 12 and the cold shrink sheath tube 3 .

[0058] like Figure 1 As shown, there are at least two interfaces 12 and cold shrink sheath tubes 3 and they correspond one to one; specifically, three interfaces 12 are provided on the terminal body 1, which are respectively connected to three cold shrink sheath tubes 3, and a bottom sealing structure 5 is correspondingly provided at the connection between each cold shrink sheath tube 3 and the interface 12.

[0059] In this embodiment, if Figure 4As shown, the cable sealing structure 6 includes a second protective sleeve 61, a second filling piece 62 and a third sealing piece 63; the second protective sleeve 61 is provided with a first sleeve opening and a second sleeve opening that are connected in the same manner, the end of the cold shrink sheath tube 3 away from the terminal body 1 passes through the first sleeve opening, and is connected to the three-phase main cable 7 passing through the second sleeve opening in the second protective sleeve 61, and the second filling piece 62 is located in the gap between the inner wall of the second protective sleeve 61 and the cold shrink sheath tube 3. The gap between the first sleeve opening and the cold shrink sheath tube 3 and the gap between the second sleeve opening and the three-phase main cable 7 are both provided with a third sealing piece 63. In addition, the second protective sleeve 61 is also provided with a third sleeve opening for accessing the optical fiber 16; the third sealing piece 63 is provided on the third sleeve opening. In this embodiment, the key parameters such as partial discharge, humidity, and temperature at the position of the receiving terminal body 1 are arranged and connected by the built-in optical fiber 16, and the operation and maintenance monitoring of the distribution cable system is implemented.

[0060] Among them, the second protective sleeve 61 can be selected as a heat shrink six-finger sleeve, which cooperates with the inner sleeve of the cable on the three-phase main cable 7; the first sleeve mouth is the finger end of the heat shrink six-finger sleeve, and the second sleeve mouth is the body end of the heat shrink six-finger sleeve; the third sealing member 63 can also be made of sealant; different sealants are respectively wrapped and arranged on the finger end and body end of the heat shrink six-finger sleeve to achieve overall sealing.

[0061] In this embodiment, the other end of the cold shrink sheath tube 3 is connected to the three-phase main cable 7 through an adapter 8, on which a braided ground wire 9 is provided, and the adapter 8 is a corrugated tube metal sheath; the braided ground wire 9 is fixed to the corrugated tube metal sheath by copper wire, and then reinforced by soldering, while also ensuring current flow, thereby ensuring reliable grounding and achieving the purpose of extending the service life of the terminal.

[0062] Moreover, Figure 5 As shown, the conventional terminal body 1 is expanded mostly by using the steel wire 10. Specifically, the terminal body 1 is first inserted into the steel wire 10, and the expander 13 extends the telescopic expansion tube 14 to expand the terminal body 1. After expansion, the expansion bar 17 is placed inside the telescopic expansion tube 14, and the telescopic expansion tube 14 is retracted. Finally, the steel wire 10 sandwiched between the terminal body 1 and the expansion bar 17 is pulled out. During the pulling-out process, because the steel wire 10 is a hard structure, the steel wire 10 is easy to damage the rubber insulation part, and the degree of damage cannot be checked after expansion, resulting in the defect being amplified during the installation and operation of the joint, resulting in the joint breakdown.

[0063] Therefore, this embodiment uses a traceless expansion technology, a smooth high-strength expansion mold and a plastic support tube for expansion, such as Figure 6As shown, the steel wire 10 is replaced with a high-strength smooth soft mold 15 to ensure the smoothness and flatness of the inside of the terminal body 1, improve the insulation performance of the joint surface, reduce the electric field strength, and achieve the purpose of extending the service life of the joint. Among them, the high-strength smooth soft mold 15 is made of a polyester fiber material and has a bag structure. It has high strength performance and can ensure that it will not be damaged under a large tensile force, and the surface is smooth.

[0064] To sum up, the present invention provides a long-life distribution cable terminal, in which a conductor sealing structure, a bottom sealing structure and a cable sealing structure are correspondingly arranged at the connection between the terminal body, the conductor terminal and the cold shrink sheath tube, and multi-point sealing is relied on to achieve comprehensive and high-strength protection, thereby improving the overall hardware performance of the terminal. At the same time, a multiple protection structure composed of a sealing tube, a sealing sleeve, a filler and a sealing member is adopted at the sealing part to improve the sealing performance of the method, the braided belt is fixed to the metal sheath of the corrugated tube by copper wire, and then reinforced by soldering, while also ensuring flow and reliable grounding, and the terminal body is expanded through a traceless expansion technology, using a smooth high-strength expansion mold and a plastic support tube to extend the service life and ensure safe operation.

[0065] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A long-life distribution cable terminal, characterized in that: It includes a terminal body, a conductor terminal, a cold shrink sheath, a conductor sealing structure, a bottom sealing structure and a cable sealing structure; A connecting portion is provided on the top of the terminal body, the connecting portion is connected to the conductor terminal, an interface is provided on the bottom of the terminal body, the interface is connected to one end of the cold shrink sheath tube, and the other end of the cold shrink sheath tube is used to connect a three-phase main cable; The conductor sealing structure is sleeved at the connection between the connecting part and the conductor terminal, the bottom sealing structure is sleeved at the connection between the interface and the cold shrink sheath tube, and the cable sealing structure is sleeved at the connection between the cold shrink sheath tube and the three-phase main cable.

2. A long-life distribution cable terminal according to claim 1, characterized in that: The conductor sealing structure comprises a sealing tube and a first filling piece; The sealing tube has a first tube opening and a second tube opening which are in the same communication; The conductor terminal passes through the first pipe opening and is connected to the connecting portion passing through the second pipe opening in the sealing tube; The first filling member fills a gap between an inner side wall of the sealing tube and the conductor terminal and a gap between an inner side wall of the sealing tube and the connecting portion.

3. A long-life distribution cable terminal according to claim 2, characterized in that: The conductor sealing structure further includes a first sealing member; The first sealing member is disposed in a gap between the first pipe opening and the conductor terminal and in a gap between the second pipe opening and the connecting portion.

4. A long-life distribution cable terminal according to claim 3, characterized in that: A cold shrink sealing sleeve is provided on a surface of the first sealing member facing the outside of the sealing tube.

5. A long-life distribution cable terminal according to claim 1, characterized in that: The bottom sealing structure comprises a first protective sleeve and a second sealing member; The first protective sleeve is arranged at the connection between the interface and the cold shrink sleeve tube, the end of the cold shrink sleeve tube is inserted into the interface, the second seal is located in the first protective sleeve, and the second seal blocks the gap between the interface and the end of the cold shrink sleeve tube.

6. A long-life distribution cable terminal according to claim 1, characterized in that: There are at least two interfaces and at least two cold shrink sheath tubes in one-to-one correspondence.

7. A long-life distribution cable terminal according to claim 1, characterized in that: The cable sealing structure comprises a second protective sleeve and a second filling piece; The second protective sleeve is provided with a first sleeve opening and a second sleeve opening which are connected in the same manner. The end of the cold shrink sleeve tube away from the terminal body passes through the first sleeve opening and is connected to the three-phase main cable passing through the second sleeve opening in the second protective sleeve. The second filling piece is located in the gap between the inner side wall of the second protective sleeve and the cold shrink sleeve tube.

8. A long-life distribution cable terminal according to claim 7, characterized in that: The cable sealing structure further comprises a third sealing member; The third sealing member is provided in the gap between the first bushing opening and the cold shrinkable sheath tube and in the gap between the second bushing opening and the three-phase main cable.

9. A long-life distribution cable terminal according to claim 8, characterized in that: The second protective sleeve is also provided with a third sleeve port for accessing the optical fiber; The third sealing member is arranged on the third sleeve opening.

10. A long-life distribution cable terminal according to claim 1, characterized in that: Also includes adapters; The other end of the cold shrink sheath is connected to the three-phase main cable through the adapter, and the adapter is provided with a braided ground wire.

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