Fuse sheath and ring main unit

Abstract

The utility model relates to the technical field of power equipment, and specifically discloses a fuse sheath and a ring main unit. The second sheath part and the third sheath part of the fuse sheath are respectively and integrally connected with the first sheath part, so that the number of parts is reduced, and the structure of the fuse sheath is simplified; the first sheath part is provided with a first gap along the axial direction, the second sheath part is provided with a second gap along the axial direction, the third sheath part is provided with a third gap along the axial direction, and the third gap and the second gap are respectively communicated with the first gap. The first sheath part is sleeved on the outer side of the fuse, the second sheath part is sleeved on the outer side of the upper fuse seat, and the third sheath part is sleeved on the outer side of the lower fuse seat, so that the fuse sheath is convenient to install; and the outer sides of the upper fuse seat, the lower fuse seat and the supporting insulator are sleeved with the sheath parts, so that the miniaturization requirement of the ring main unit is met, and meanwhile, the insulation grade between two adjacent phases in the ring main unit is also improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a fuse sheath and a ring main unit. Background Technology

[0002] Ring main units (RMUs) are mainly used in three-phase AC high-voltage power distribution systems. The RMU housing contains a three-phase load switch, a three-phase grounding switch, and three fuses. Each fuse has an upper fuse holder and a lower fuse holder at both ends for securing it. The grounding switch is used for line discharge and to ensure safety during maintenance. The grounding switch includes a supporting insulator, and the lower fuse holder is fixed to the supporting insulator. The lower fuse holder has lap holes for connecting cables. The phase spacing P, cabinet width W, and cabinet depth D of a RMU are important technical parameters of high-voltage complete electrical systems. Compact structure, small size, and ease of use are the goals of users and the direction of product development. Existing RMUs have a phase spacing P = 275mm and a cabinet width W = 650mm, which are relatively large and cannot meet the needs of some domestic and international users for miniaturization (phase spacing ≤ 230mm, cabinet width 500mm). To address the aforementioned issues, existing technologies employ protective sleeves on the outside of the fuses. This ensures the insulation level of adjacent phases while reducing the phase spacing, thereby decreasing the width of the ring main unit. However, the protective sleeves in existing technologies have complex structures, numerous components, and cumbersome assembly, reducing the assembly efficiency of the ring main unit. Utility Model Content

[0003] The purpose of this utility model is to provide a fuse sleeve and a ring main unit. The fuse sleeve has a simple structure, few parts, and is easy to install, thereby improving the assembly efficiency of the ring main unit and improving the insulation level of adjacent phases in the ring main unit.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] In a first aspect, a fuse sleeve is provided, wherein one end of the fuse is fixed to an upper fuse holder and the other end is fixed to a lower fuse holder, the fuse sleeve comprising:

[0006] A first sheath portion is used to be fitted onto the outside of the fuse, and the first sheath portion is provided with a first gap along the axial direction;

[0007] The second sheath is used to be fitted onto the outside of the upper welding seat. The second sheath is integrally connected with the first sheath. The second sheath is provided with a second gap along the axial direction. The second gap communicates with the first gap.

[0008] The third sheath is used to be fitted onto the outside of the lower welding seat. The third sheath is integrally connected with the first sheath. The third sheath is provided with a third gap along the axial direction. The third gap communicates with the first gap.

[0009] The fuse sheath is made of flexible insulating material.

[0010] As an optional technical solution for the aforementioned fuse sheath, at the first gap, the two edges of the first sheath portion are respectively connected to a first mating plate, the first mating plate extends along the length direction of the first gap, and the two first mating plates are arranged opposite to each other and can be fitted together.

[0011] As an optional technical solution for the aforementioned fuse sheath, each of the two first mating plates is provided with a first connecting hole, the first connecting holes on the two first mating plates are arranged in a one-to-one correspondence, and the two first mating plates are connected by a first connector passing through the first connecting hole.

[0012] As an optional technical solution for the aforementioned fuse sheath, at the second gap, the two edges of the second sheath are respectively connected to a second mating plate, the second mating plate extends along the length direction of the second gap, and the two second mating plates are arranged opposite to each other and can be fitted together.

[0013] As an optional technical solution for the aforementioned fuse sheath, each of the two second mating plates is provided with a second connecting hole, and the second connecting holes on the two second mating plates are arranged in a one-to-one correspondence. The two second mating plates are connected by a second connector passing through the second connecting hole.

[0014] As an optional technical solution for the aforementioned fuse sheath, the second sheath portion is provided with a through groove, one end of which communicates with the second gap, and the other end of which passes through the end of the second sheath portion.

[0015] As an optional technical solution for the aforementioned fuse sheath, the lower fuse holder is disposed on the supporting insulator of the grounding switch;

[0016] The third sheath includes a lower fusible base sheath, an insulator sheath, and a terminal sheath. The lower fusible base sheath is fitted over the outside of the lower fusible base. The third gap is located in the lower fusible base sheath. The insulator sheath is located on the side of the lower fusible base sheath where the third gap is located. The insulator sheath is fitted over the outside of the supporting insulator. The terminal sheath is located on the side of the lower fusible base sheath that is opposite to the first sheath. The terminal sheath is used to fit over the outside of the conductive component connected to the lower fusible base.

[0017] As an optional technical solution for the aforementioned fuse sheath, one side of the lower fuse holder sheath is provided with a through hole for the lower fuse holder to pass through, the insulator sheath is a ring structure and is arranged around the through hole, and the insulator sheath is provided with a fourth gap, which communicates with the third gap.

[0018] As an optional technical solution for the aforementioned fuse sheath, the lower fuse holder sheath is provided with an opening on one side away from the first sheath, the terminal sheath is a cylindrical structure with both ends through, and one end of the terminal sheath is connected to the edge of the lower fuse holder sheath. The side wall of the terminal sheath is provided with a clearance hole, and the clearance hole and the through hole are located on the same side and communicate with each other.

[0019] As an optional technical solution for the aforementioned fuse sheath, the inner diameter of the end of the terminal sheath connected to the lower fuse holder sheath decreases towards the other end.

[0020] Secondly, a ring main unit is provided, including a cabinet, wherein a load switch, a grounding switch, an upper fuse holder, a lower fuse holder, a fuse, and a fuse sleeve as described above are provided inside the cabinet, the grounding switch includes a supporting insulator, the upper fuse holder is connected to the moving contact of the load switch, and the lower fuse holder is provided with an overlap hole for connecting to a conductive component.

[0021] The beneficial effects of this utility model are:

[0022] The fuse sleeve provided by this utility model includes a first sleeve portion, a second sleeve portion, and a third sleeve portion. The second and third sleeve portions are integrally connected to the first sleeve portion, reducing the number of components and simplifying the structure of the fuse sleeve. The first sleeve portion has a first axial gap, the second sleeve portion has a second axial gap, and the third sleeve portion has a third axial gap. The third and second gaps are respectively connected to the first gap. When installing the fuse sleeve, the first, second, and third sleeve portions are pried open, so that the first sleeve portion is fitted onto the outside of the fuse, the second sleeve portion is fitted onto the outside of the upper fuse holder, and the third sleeve portion is fitted onto the outside of the lower fuse holder, facilitating the installation of the fuse sleeve and improving the assembly efficiency of the ring main unit. In addition, the outer sides of both the upper and lower fuse holders are fitted with sleeve portions, which, while meeting the miniaturization requirements of the ring main unit, also improves the insulation level between adjacent phases within the ring main unit, thereby improving the safety level of the ring main unit.

[0023] The ring main unit provided by this utility model can meet the requirements of miniaturization in terms of phase spacing and cabinet width, and also improves the insulation level between two adjacent phases in the ring main unit, thereby improving the safety level of the ring main unit. Attached Figure Description

[0024] Figure 1 This is a left view of the internal structure of the ring main unit provided in this embodiment of the utility model;

[0025] Figure 2 This is a front view of the internal structure of the ring main unit provided in this embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the grounding switch in the open state provided in this embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the grounding switch in the closed state according to an embodiment of the present invention;

[0028] Figure 5 This is a first-view axonometric view of the fuse sleeve provided in this embodiment of the utility model;

[0029] Figure 6 This is a second-view axonometric view of the fuse sleeve provided in this embodiment of the present invention;

[0030] Figure 7 yes Figure 6 An enlarged schematic diagram of the structure at point A.

[0031] In the picture:

[0032] 100. Fuse; 200. Upper fuse holder; 300. Lower fuse holder; 301. Overlap hole; 400. Grounding switch; 401. Support insulator; 402. Bracket; 403. Grounding switch moving contact; 500. Fuse sleeve; 600. Load switch; 700. Cabinet;

[0033] 1. First sheath section; 2. Second sheath section; 3. Third sheath section;

[0034] 11. First gap; 12. First mating plate; 13. First connecting hole;

[0035] 21. Second mating plate; 22. Second connecting hole; 23. Through groove; 24. Second gap;

[0036] 31. Lower fuse holder sheath; 311. Through hole; 312. Connecting hole; 32. Insulator sheath; 33. Terminal sheath; 331. Clearance hole; 34. Third gap; 35. Fourth gap. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] like Figure 1 and Figure 2 As shown, this embodiment provides a ring main unit, which includes a cabinet 700. The cabinet 700 houses a load switch 600, a grounding switch 400, an upper fuse holder 200, a lower fuse holder 300, and a fuse 100. The grounding switch 400 includes a supporting insulator 401. The lower fuse holder 300 is disposed on the supporting insulator 401 of the grounding switch 400. The lower fuse holder 300 has a lap hole 301 for connecting to a conductive component, which can be a cable or a branch busbar. The upper fuse holder 200 is connected to the moving contact of the load switch 600, and the stationary contact of the load switch 600 is connected to the high-voltage incoming cable.

[0042] like Figure 2 , Figure 3 and Figure 4As shown, the grounding switch 400 also includes a bracket 402 and a grounding switch moving contact 403. The bracket 402 is fixed inside the cabinet 700. The grounding switch moving contact 403 can be connected to or separated from the lower fuse holder 300, thereby realizing the closing or opening of the grounding switch 400.

[0043] The ring main unit also includes fuse sleeves 500. Typically, the ring main unit is equipped with a three-phase load switch 600 and a three-phase grounding switch 400. Each phase load switch 600 is equipped with an upper fuse holder 200, and each phase grounding switch 400 is equipped with a lower fuse holder 300. Correspondingly, the ring main unit is equipped with three fuses 100, and each fuse 100 is equipped with a fuse sleeve 500, thereby improving the insulation level between adjacent phases.

[0044] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the fuse sleeve 500 includes a first sleeve portion 1, a second sleeve portion 2, and a third sleeve portion 3. The first sleeve portion 1 is fitted onto the outside of the fuse 100, and has a first axial gap 11. The second sleeve portion 2 is fitted onto the outside of the upper fuse holder 200, and is integrally connected to the first sleeve portion 1. The second sleeve portion 2 has a second axial gap 24. The third sleeve portion 3 is fitted onto the outside of the lower fuse holder 300, and is integrally connected to the first sleeve portion 1. The third sleeve portion 3 has a third axial gap 34, which communicates with the first gap 11. The fuse sleeve 500 is made of flexible insulating material.

[0045] In this embodiment, the second sheath portion 2 and the third sheath portion 3 of the fuse sleeve 500 are integrally connected to the first sheath portion 1, reducing the number of components and simplifying the structure of the fuse sleeve 500. The first sheath portion 1 has a first gap 11 along the axial direction, the second sheath portion 2 has a second gap 24 along the axial direction, and the third sheath portion 3 has a third gap 34 along the axial direction. The third gap 34 and the second gap 24 are respectively connected to the first gap 11. When installing the fuse sleeve 500, the first sheath portion 1 and the third sheath portion 3 are pried open. The first sheath 1 is fitted onto the outside of the fuse 100, the second sheath 2 is fitted onto the outside of the upper fuse holder 200, and the third sheath 3 is fitted onto the outside of the lower fuse holder 300, facilitating the installation of the fuse sleeve 500 and thus improving the assembly efficiency of the ring main unit. In addition, the outer sides of both the upper fuse holder 200 and the lower fuse holder 300 are fitted with sheaths, which not only meet the requirements for miniaturization of the ring main unit, but also improve the insulation level between two adjacent phases in the ring main unit, thereby improving the safety level of the ring main unit.

[0046] The fuse sleeve 500 can be made of silicone rubber composite insulation material; the specific material of the fuse sleeve 500 is not specifically limited here. The fuse sleeve 500 is integrally molded by injection molding, which is simple to process and has low processing cost.

[0047] The fuse 100 is typically circular, therefore the first sheath portion 1 is cylindrical. At the gap, two first mating plates 12 are connected to the two edges of the first sheath portion 1. The first mating plates 12 extend along the length of the first gap 11, and the two first mating plates 12 are positioned opposite each other and can be fitted together. The provision of the first mating plates 12 and the connection of the two first mating plates 12 fix the first sheath portion 1 to the fuse 100, effectively providing insulation.

[0048] Optionally, each of the two first mating plates 12 is provided with a first connecting hole 13, and the first connecting holes 13 on the two first mating plates 12 are arranged one-to-one. The two first mating plates 12 are connected by a first connector passing through the first connecting holes 13. The connection structure is simple and facilitates the disassembly and assembly of the first sheath 1. Further, the first mating plate 12 and the first sheath 1 are integrally connected. The material of the first mating plate 12 is the same as that of the first sheath 1. Therefore, the first connector can be a nylon cable tie. The nylon cable tie passes through the first connecting holes 13 of the two first mating plates 12 to connect the two first mating plates 12, which is convenient for operation. Each first mating plate 12 is provided with multiple first connecting holes 13 along the extension direction of the first mating plate 12 to achieve stable fixation of the first sheath 1 to the fuse 100. In some other feasible embodiments, the first connector includes a bolt and a nut. The bolt passes through the first connecting holes 13 of the two first mating plates 12 and is screwed to the nut.

[0049] Since the size of the upper fusible base 200 is larger than the outer diameter of the fuse 100, the size of the second sheath 2 is adapted to the upper fusible base 200. The second sheath 2 can be a rectangular or circular structure, which is not specifically limited here, and the internal enclosure space of the second sheath 2 is adapted to the upper fusible base 200. At the second gap 24, the two edges of the second sheath 2 are respectively connected to second mating plates 21. The second mating plates 21 extend along the length direction of the second gap 24, and the two second mating plates 21 are arranged opposite each other and can be fitted together. The provision of second mating plates 21 and the ability to connect the two second mating plates 21 to fix the second sheath 2 on the upper fusible base 200 effectively provides insulation and isolation.

[0050] Optionally, each of the two second mating plates 21 is provided with a second connecting hole 22, and the second connecting holes 22 on the two second mating plates 21 are arranged one-to-one. The two second mating plates 21 are connected by a second connector passing through the second connecting holes 22. The connection structure is simple and facilitates the disassembly and assembly of the second sheath 2. Further, the second mating plate 21 and the second sheath 2 are integrally connected. The material of the second mating plate 21 is the same as that of the second sheath 2. Therefore, the second connector can be a nylon cable tie. The nylon cable tie passes through the second connecting holes 22 of the two second mating plates 21 to connect the two second mating plates 21, which is convenient for operation. Each second mating plate 21 is provided with multiple second connecting holes 22 along the extension direction of the second mating plate 21 to achieve stable fixation of the second sheath 2 on the upper welding seat 200. The first mating plate 12 and the second mating plate 21 can be arranged alternately or connected to each other, which is not specifically limited here. In some other feasible embodiments, the second connector includes a bolt and a nut, with the bolt passing through the second connecting holes 22 of the two second mating plates 21 and screwed into the nut.

[0051] One end of the second gap 24 does not penetrate the second sheath portion 2. The side wall of the second sheath portion 2 where the second gap 24 is located has a through groove 23. One end of the through groove 23 communicates with the second gap 24, and the other end of the through groove 23 penetrates the end of the second sheath portion 2. When installing the second sheath portion 2 onto the upper melting base 200, the second sheath portion 2 can be completely pried open, facilitating its installation on the upper melting base 200. Furthermore, the through groove 23 is adapted to the structure of the upper melting base 200 to facilitate its insertion.

[0052] The third sheath part 3 includes a lower fusible base sheath part 31, an insulator sheath part 32, and a terminal sheath part 33. The lower fusible base sheath part 31 is fitted onto the outside of the lower fusible base 300. A third gap 34 is provided in the lower fusible base sheath part 31 to facilitate opening the lower fusible base sheath part 31 and fitting it onto the lower fusible base 300. The insulator sheath part 32 is located on the side of the lower fusible base sheath part 31 where the third gap 34 is located. The insulator sheath part 32 is fitted onto the outside of the supporting insulator 401. When the lower fusible base sheath part 31 is fitted onto the lower fusible base 300, the insulator sheath part 32 is also fitted onto the outside of the supporting insulator 401. The terminal sheath part 33 is located on the side of the lower fusible base sheath part 31 opposite to the first sheath part 1. The terminal sheath part 33 is used to fit onto the outside of the conductive part connected to the lower fusible base 300. The terminal sheath 33 further improves the insulation level between adjacent phases.

[0053] Optionally, since the size of the lower fuse holder 300 is larger than the outer diameter of the fuse 100, the size of the lower fuse holder sheath 31 is adapted to the lower fuse holder 300. The lower fuse holder sheath 31 can be a rectangular or circular structure, without specific limitation, and the internal enclosure space of the lower fuse holder sheath 31 is adapted to the lower fuse holder 300. The lower fuse holder sheath 31 is provided with a third slit 34, and one side of the lower fuse holder sheath 31 is provided with a through hole 311 for the lower fuse holder 300 to pass through. The insulator sheath 32 is an annular structure and is arranged around the through hole 311. The insulator sheath 32 is provided with a fourth slit 35, which communicates with the third slit 34, so as to facilitate prying open the insulator sheath 32 so that the lower fuse holder 300 passes through the insulator sheath 32 and the through hole 311 and is placed inside the lower fuse holder sheath 31.

[0054] The lower fuse holder sheath 31 has an opening on the side opposite to the first sheath 1. The terminal sheath 33 is a cylindrical structure with both ends through it, and one end of the terminal sheath 33 is connected to the edge of the lower fuse holder sheath 31. The side wall of the terminal sheath 33 is provided with a clearance hole 331, which is located on the same side and communicates with the through hole 311. The clearance hole 331 is used to avoid the moving contact 403 of the grounding switch. The clearance hole 331 communicates with the through hole 311, and the moving contact 403 of the grounding switch can contact the lower fuse holder 300 to achieve conduction.

[0055] Furthermore, the through hole 311 is a circular hole adapted to the supporting insulator 401. The through hole 311 and the clearance hole 331 are connected by a connecting hole 312, which is provided on the lower fusion seat sheath 31. The insulator sheath 32 can fully enclose the supporting insulator 401 or partially enclose it. In this embodiment, due to the connecting hole 312, the insulator sheath 32 partially encloses the supporting insulator 401. The insulator sheath 32 is not a closed annular structure. The insulator sheath 32 is divided into two semi-annular structures by the connecting hole 312 and the fourth gap 35. Adjacent supporting insulators 401 are insulated and isolated by the insulator sheath 32.

[0056] In some other embodiments, the insulator sheath 32 may be arranged around the through hole 311, and the insulator sheath 32 may have an opening at the connecting hole 312 to provide clearance space for the moving contact 403 of the grounding switch. The insulator sheath 32 may fully enclose and support the insulator 401.

[0057] The inner diameter of the terminal sheath 33, which connects to the lower fuse holder sheath 31, decreases from one end to the other. The lower fuse holder 300 has an overlap hole 301. The end of the terminal sheath 33 with the larger inner diameter is fitted over the overlap hole 301, primarily to shield the connection between the conductive component and the lower fuse holder 300. The end of the terminal sheath 33 with the smaller inner diameter is fitted over the conductive component, increasing the creepage distance between adjacent conductive components and further improving the safety level of the ring main unit. Therefore, to accommodate the structure of the lower fuse holder 300 and the conductive component, and to improve the compactness of the internal structure of the ring main unit, the terminal sheath 33 is designed with a decreasing inner diameter.

[0058] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fuse sleeve, wherein one end of a fuse (100) is fixed to an upper fuse holder (200) and the other end is fixed to a lower fuse holder (300), characterized in that, The fuse sheath includes: A first sheath (1) is used to be fitted onto the outside of the fuse (100), and the first sheath (1) is provided with a first gap (11) along the axial direction; The second sheath (2) is used to be sleeved on the outside of the upper welding seat (200). The second sheath (2) is integrally connected with the first sheath (1). The second sheath (2) is provided with a second gap (24) along the axial direction. The second gap (24) communicates with the first gap (11). The third sheath (3) is used to be sleeved on the outside of the lower welding seat (300). The third sheath (3) is integrally connected with the first sheath (1). The third sheath (3) is provided with a third gap (34) along the axial direction. The third gap (34) is connected to the first gap (11). The fuse sheath is made of flexible insulating material.

2. The fuse sleeve according to claim 1, characterized in that, At the first gap (11), the two edges of the first sheath (1) are respectively connected to the first mating plate (12). The first mating plate (12) extends along the length direction of the first gap (11), and the two first mating plates (12) are arranged opposite to each other and can be fitted together.

3. The fuse sleeve according to claim 2, characterized in that, Each of the two first docking plates (12) is provided with a first connecting hole (13). The first connecting holes (13) on the two first docking plates (12) are arranged one-to-one. The two first docking plates (12) are connected by a first connector passing through the first connecting hole (13).

4. The fuse sleeve according to claim 1, characterized in that, At the second gap (24), the two edges of the second sheath (2) are respectively connected to the second mating plate (21). The second mating plate (21) extends along the length direction of the second gap (24), and the two second mating plates (21) are arranged opposite to each other and can be fitted together.

5. The fuse sleeve according to claim 4, characterized in that, The two second docking plates (21) are respectively provided with second connecting holes (22), and the two second docking plates (21) are provided with corresponding second connecting holes (22). The two second docking plates (21) are connected by passing through the second connecting holes (22) through the second connector.

6. The fuse sleeve according to claim 4, characterized in that, The second sheath part (2) is provided with a through groove (23), one end of the through groove (23) is connected to the second gap (24), and the other end of the through groove (23) passes through the end of the second sheath part (2).

7. The fuse sleeve according to claim 1, characterized in that, The lower fuse holder (300) is disposed on the supporting insulator (401) of the grounding switch (400); The third sheath part (3) includes a lower fusible base sheath part (31), an insulator sheath part (32), and a terminal sheath part (33). The lower fusible base sheath part (31) is sleeved on the outside of the lower fusible base (300). The third gap (34) is provided on the lower fusible base sheath part (31). The insulator sheath part (32) is provided on the side of the lower fusible base sheath part (31) where the third gap (34) is provided. The insulator sheath part (32) is sleeved on the outside of the supporting insulator (401). The terminal sheath part (33) is provided on the side of the lower fusible base sheath part (31) opposite to the first sheath part (1). The terminal sheath part (33) is used to sleeve on the outside of the conductive part connected to the lower fusible base (300).

8. The fuse sleeve according to claim 7, characterized in that, The lower fusion seat sheath (31) has a through hole (311) on one side for the lower fusion seat (300) to pass through. The insulator sheath (32) has an annular structure and is arranged around the through hole (311). The insulator sheath (32) has a fourth gap (35) which communicates with the third gap (34).

9. The fuse sleeve according to claim 8, characterized in that, The lower welding seat sheath (31) is opened on the side opposite to the first sheath (1). The terminal sheath (33) is a cylindrical structure with both ends through. One end of the terminal sheath (33) is connected to the edge of the lower welding seat sheath (31). The side wall of the terminal sheath (33) is provided with a clearance hole (331). The clearance hole (331) and the through hole (311) are located on the same side and are connected.

10. The fuse sleeve according to claim 9, characterized in that, The inner diameter of the terminal sheath (33) connected to the lower fusion seat sheath (31) decreases from one end to the other.

11. A ring main unit, characterized in that, The device includes a cabinet (700), which houses a load switch (600), a grounding switch (400), an upper fuse holder (200), a lower fuse holder (300), a fuse (100), and a fuse sleeve (500) according to any one of claims 1-10. The grounding switch (400) includes a supporting insulator (401). The upper fuse holder (200) is connected to the moving contact of the load switch (600), and the lower fuse holder (300) has an overlap hole (301) for connecting to a conductive component.

Images