A fully insulated drop-out fuse

Abstract

The present invention provides a fully insulated drop-out fuse, including an insulator, an upper contact assembly, a lower contact assembly and a fuse tube assembly, and also including: two wiring terminals, which are fixedly connected to the upper contact assembly and the lower contact assembly respectively, the wiring terminal including a wiring post and at least one first bolt arranged on the wiring post, the wiring post is formed with a wire cavity for inserting a cable, and the first bolt is used to press and fix the cable to the wiring post; an insulating cover shell, which is used to shield the upper contact assembly, the lower contact assembly and the wiring terminal, and is provided with an opening for the fuse tube assembly to move. When wiring, it is only necessary to insert the cable into the wire cavity and then press and fix it with the first bolt. Compared with the prior art method of installing a wiring nose, this wiring is simpler; in addition, the insulating cover shell is used to shield the upper contact assembly, the lower contact assembly and the wiring terminal, so as to avoid problems such as overlapping of foreign objects and hidden dangers of animals, and ensure phase insulation; the buffer pad can effectively buffer the impact force of the ear shaft.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution equipment, and in particular to a fully insulated drop-out fuse. Background Art

[0002] Drop-out fuses are the most commonly used short-circuit protection switches for 10kV distribution line branches and distribution transformers. Drop-out fuses installed on 10kV distribution line branches can reduce the scope of power outages because they have an obvious disconnection point and have the function of an isolating switch, creating a safe working environment for the maintenance section lines and equipment.

[0003] The existing drop-out fuse includes an insulator assembly, an upper contact assembly, a lower contact assembly and a fuse tube. When the cable is installed with the upper contact assembly and the lower contact assembly, it is necessary to first strip off the insulating sheath and then crimp the upper wiring nose, and then fix the wiring nose to the conductive plate assembly with bolts. This installation is cumbersome and time-consuming and labor-intensive because it is an aerial operation. In addition, since the upper contact assembly and the lower contact assembly are exposed, there are problems such as foreign matter overlapping and animal hazards, which affect the safety of the equipment. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the drop-out fuse in the prior art that it is laborious to install and has low safety performance, thereby providing a fully insulated drop-out fuse that is quick and convenient to install and has high safety performance.

[0005] To this end, the present invention provides a fully insulated drop-out fuse, comprising an insulator, an upper contact assembly, a lower contact assembly and a fuse tube assembly, wherein the lower contact assembly comprises a lower conductive plate, an ear shaft seat and an ear shaft, one end of the lower conductive plate is fixedly connected to the wiring terminal, and the other end is fixedly connected to the ear shaft seat, the ear shaft is rotatably mounted on the ear shaft seat, and is fixedly connected to the bottom of the fuse tube assembly, the fuse also comprises two wiring terminals, an insulating cover and a buffer pad, the two wiring terminals are respectively fixedly connected to the upper contact assembly and the lower contact assembly, the wiring terminal comprises a terminal post, and at least one first bolt arranged on the terminal post, the terminal post is formed with a wire cavity for inserting a cable, and the first bolt is used to press and fix the cable to the terminal post; the insulating cover is used to shield the upper contact assembly, the lower contact assembly and the wiring terminal, and is provided with an opening for the fuse tube assembly to move; the buffer pad is detachably mounted on the insulating cover, and is used to abut against the ear shaft when the ear shaft rotates.

[0006] The insulating shell comprises a first shell portion and a second shell portion which are snap-fitted together, and the first shell portion and the second shell portion are fixed by second bolts or fasteners.

[0007] The buffer pad is installed between the first shell part and the second shell part, and T-shaped blocks are formed on both sides of the buffer pad. The first shell part and the second shell part are both formed with T-shaped slots adapted to be engaged with the T-shaped blocks.

[0008] The insulating cover shell has a first cover arranged at the opening of the cable cavity, and the first cover is formed with a bell mouth for guiding and inserting the cable.

[0009] The inner wall of the bell mouth is provided with annular convex ribs distributed at intervals along the cable insertion direction.

[0010] A second clamping block is provided on the outer wall of the first cover, and a second clamping groove adapted to be clamped with the second clamping block is provided on the inner wall of the insulating shell.

[0011] A second cover for shielding the first bolt and the second bolt is installed on the insulating cover.

[0012] The technical solution of the present invention has the following advantages:

[0013] 1. The fully insulated drop-out fuse provided by the present invention is provided with a wiring terminal and an insulating cover. The wiring terminal includes a wiring post and at least one first bolt arranged on the wiring post. The wiring post is formed with a wire cavity for inserting a cable. When wiring, the cable only needs to be inserted into the wire cavity and then compressed and fixed by the first bolt. Compared with the method of installing a wiring nose in the prior art, this wiring is simpler; in addition, the insulating cover is used to shield the upper contact assembly, the lower contact assembly and the wiring terminal, thereby avoiding problems such as foreign matter overlap and animal hazards, and ensuring phase insulation; a buffer pad is detachably installed on the insulating cover, which is against the ear shaft when it rotates. In this way, when the fuse tube assembly falls, the ear shaft will rotate relative to the ear shaft seat, and the buffer pad can effectively buffer the impact force of the ear shaft, effectively avoiding the ear shaft directly hitting the wiring terminal, thereby extending the service life of the equipment.

[0014] 2. For the fully insulated drop-out fuse provided by the present invention, when installing the buffer pad, first insert the T-shaped block on one side into the T-shaped slot of the first cover shell part, then snap the second cover shell part into the first cover shell part, and then snap the T-shaped block on the other side of the buffer pad into the T-shaped slot of the second cover shell part. Finally, assemble and fix the second cover shell part and the first cover shell part by a second bolt or a fastener, so that the buffer pad is fixed on the insulating cover shell. The T-shaped block and the T-shaped slot have the advantages of simple structure and quick and convenient disassembly and assembly.

[0015] 3. The fully insulated drop-out fuse provided by the present invention has an insulating cover with a first cover arranged at the opening of the cable cavity. The first cover is formed with a bell mouth for guiding the cable to be inserted. The inner wall of the bell mouth has annular ribs distributed at intervals along the cable insertion direction. The annular ribs are in contact with the outer wall of the cable and have a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a three-dimensional diagram of the fully insulated drop-out fuse of the present invention;

[0018] Figure 2 It is a schematic diagram of the explosion structure of a fully insulated drop-out fuse;

[0019] Figure 3 This is a schematic diagram of the structure of a fully insulated drop-out fuse after removing the insulating cover;

[0020] Figure 4 It is a cross-sectional view of a fully insulated drop-out fuse;

[0021] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of part A;

[0022] Figure 6 for Figure 4 A schematic diagram of the enlarged structure of part B;

[0023] Figure 7 It is a schematic diagram of the assembly of the buffer block and the insulating cover;

[0024] Figure 8 Schematic diagram of the explosion structure of the buffer block and the insulating cover.

[0025] Explanation of the reference numerals: 1. insulator; 2. upper contact assembly; 3. lower contact assembly; 4. fuse tube assembly; 5. terminal; 6. terminal; 7. first bolt; 8. insulating cover; 9. opening; 10. second bolt; 11. first cover portion; 12. second cover portion; 13. lower conductive plate; 14. ear shaft seat; 15. ear shaft; 16. buffer pad; 17. T-shaped block; 18. T-shaped slot; 19. first cover; 20. bell mouth; 21. annular rib; 22. second block; 23. second slot; 24. second cover; 25. fuse tube; 26. inner metal tube; 27. arc shortening rod; 28. line cavity. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example

[0031] This embodiment provides a fully insulated drop-out fuse, such as Figure 1 , Figure 2 and Figure 3 As shown, it includes an insulator 1, an upper contact assembly 2, a lower contact assembly 3, a fuse tube assembly 4, two connecting terminals 5, an insulating cover 8 and a buffer pad 16.

[0032] Two connecting terminals 5 are fixedly connected to the upper contact assembly 2 and the lower contact assembly 3 respectively. Figure 4 and Figure 5 As shown, the wiring terminal 5 includes a wiring post 6 and two first bolts 7 arranged on the wiring post 6. The wiring post 6 is formed with a wire cavity 28 for inserting a cable. The first bolts 7 are used to press and fix the cable to the wiring post 6.

[0033] The insulating cover 8 is used to cover the upper contact assembly 2, the lower contact assembly 3 and the wiring terminal 5. Figure 1 As shown, the insulating housing 8 is provided with an opening 9 for the fuse tube assembly 4 to move. The insulating housing 8 comprises a first housing portion 11 and a second housing portion 12 which are arranged to be buckled on the left and right, and the first housing portion 11 and the second housing portion 12 are fixed by a second bolt 10 or a fastener. Figure 5 and Figure 6 As shown, the insulating cover 8 has a first cover 19 arranged at the opening of the cable cavity 28, and a second cover 24 for shielding the first bolt 7 and the second bolt 10. The first cover 19 is formed with a bell mouth 20 for guiding the insertion of the cable, and the inner wall of the bell mouth 20 has annular convex ribs 21 distributed at intervals along the cable insertion direction, and the annular convex ribs 21 are pressed and fitted with the outer wall of the cable, so that the sealing effect is better. A second clamping block 22 is provided on the outer wall of the first cover 19, and a second clamping groove 23 adapted to be clamped with the second clamping block 22 is provided on the inner wall of the insulating cover 8.

[0034] The upper contact assembly 2 and the lower contact assembly 3 are respectively installed on the upper and lower parts of the insulator 1. Figure 3 As shown, the lower contact assembly 3 includes a lower conductive plate 13, a trunnion seat 14 and a trunnion 15. One end of the lower conductive plate 13 is fixedly connected to the wiring terminal 5, and the other end is fixedly connected to the trunnion seat 14. The trunnion 15 is rotatably mounted on the trunnion seat 14 and is fixedly connected to the bottom of the fuse tube assembly 4. It should be noted that the upper contact assembly 2 and the lower contact assembly 3 are existing mature technologies, so their specific structures and working principles are not described in detail.

[0035] The buffer pad 16 is detachably mounted on the insulating cover 8 and is used to abut against the ear shaft 15 when the ear shaft 15 rotates. Figure 7 , Figure 8 As shown, the buffer pad 16 is installed between the first cover shell part 11 and the second cover shell part 12, and T-shaped blocks 17 are formed on both sides thereof. The first cover shell part 11 and the second cover shell part 12 are both formed with T-shaped slots 18 adapted to be engaged with the T-shaped blocks 17.

[0036] The fuse tube assembly 4 comprises a fuse tube 25 , a metal lining tube 26 arranged inside the fuse tube 25 , and an arc shortening rod 27 arranged at the upper end of the metal lining tube 26 .

[0037] The fully insulated drop-out fuse provided by the present invention is provided with a wiring terminal 5 and an insulating cover 8. The wiring terminal 5 includes a wiring post 6 and a first bolt 7 provided on the wiring post 6. The wiring post 6 is formed with a wire cavity 28 for inserting a cable. When wiring, it is only necessary to insert the cable into the wire cavity 28 and then tighten and fix it with the first bolt 7. Compared with the method of installing a wiring nose in the prior art, this wiring method is simpler. In addition, the insulating cover is used to shield the upper contact assembly, the lower contact assembly and the wiring terminal, thereby avoiding problems such as overlapping of foreign objects and hidden dangers of animals, and ensuring insulation between phases.

[0038] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A fully insulated drop-out fuse, characterized in that: The fuse comprises an insulator (1), an upper contact assembly (2), a lower contact assembly (3) and a fuse tube assembly (4); the lower contact assembly (3) comprises a lower conductive plate (13), a trunnion seat (14) and a trunnion (15); one end of the lower conductive plate (13) is fixedly connected to a wiring terminal (5), and the other end is fixedly connected to the trunnion seat (14); the trunnion (15) is rotatably mounted on the trunnion seat (14) and fixedly connected to the bottom of the fuse tube assembly (4); the fuse further comprises: Two wiring terminals (5) are fixedly connected to the upper contact assembly (2) and the lower contact assembly (3), respectively, the wiring terminal (5) comprises a wiring post (6) and at least one first bolt (7) provided on the wiring post (6), the wiring post (6) is formed with a wire cavity (28) for inserting a cable, and the first bolt (7) is used to press and fix the cable to the wiring post (6); An insulating cover (8) for shielding the upper contact assembly (2), the lower contact assembly (3) and the wiring terminal (5), and provided with an opening (9) for the fuse tube assembly (4) to move, the insulating cover (8) comprising a first cover portion (11) and a second cover portion (12) which are arranged to be snap-fitted, the first cover portion (11) and the second cover portion (12) being fixed by a second bolt (10) or a fastener; A buffer pad (16) is detachably mounted on the insulating housing (8) and is used to abut against the ear shaft (15) when the ear shaft (15) rotates. The buffer pad (16) is mounted between the first housing portion (11) and the second housing portion (12), and has T-shaped clamping blocks (17) formed on both sides thereof. The first housing portion (11) and the second housing portion (12) are both formed with T-shaped clamping grooves (18) adapted to be clamped with the T-shaped clamping blocks (17).

2. The fully insulated drop-out fuse according to claim 1, characterized in that: The insulating cover (8) has a first cover (19) arranged at the opening of the wire cavity (28), and the first cover (19) is formed with a bell mouth (20) for guiding and inserting the cable.

3. The fully insulated drop-out fuse according to claim 2, characterized in that: The inner wall of the bell mouth (20) is provided with annular convex ribs (21) distributed at intervals along the cable insertion direction.

4. The fully insulated drop-out fuse according to claim 2, characterized in that: A second clamping block (22) is provided on the outer wall of the first sealing cover (19), and a second clamping groove (23) adapted to be clamped with the second clamping block (22) is provided on the inner wall of the insulating cover shell (8).

5. The fully insulated drop-out fuse according to claim 1, characterized in that: A second cover (24) for shielding the first bolt (7) and the second bolt (10) is mounted on the insulating cover (8).

Images