All-insulation drop-out fuse

Abstract

The utility model provides an all-insulation drop-out fuse, which comprises an insulator, an upper contact assembly, a lower contact assembly and a fuse tube assembly, and further comprises two wiring terminals which are respectively and fixedly connected with the upper contact assembly and the lower contact assembly, each wiring terminal comprises a wiring column and at least one first bolt arranged on the wiring column, a wire cavity for inserting a cable is formed in the binding post, and the first bolt is used for pressing and fixing the cable and the binding post; and the insulating housing is used for shielding 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. During wiring, a cable only needs to be inserted into the cable cavity and then is pressed and fixed through the first bolt, and compared with the mode that a wiring nose needs to be installed in the prior art, wiring is simpler; in addition, the insulating housing is used for shielding the upper contact assembly, the lower contact assembly and the wiring terminal, so that the problems of foreign matter lap joint, animal hidden dangers and the like are avoided, and inter-phase insulation is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to power distribution equipment technical field, concretely relates to a full insulation drop-out fuse. BACKGROUND

[0002] Drop-out fuse is the most common short-circuit protection switch of 10kV distribution line branch and distribution transformer. Drop-out fuse is installed on 10kV distribution line branch, and can reduce power failure range. Because it has a clear breaking point, it has the function of isolating switch, and creates a safe operation environment for maintenance section line 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 a cable is installed with the upper contact assembly and the lower contact assembly, the insulating sheath needs to be peeled off first, and then a connecting nose is crimped. Then, the connecting nose and the conductive plate assembly are fixed by bolts. This installation is relatively cumbersome, and it is time-consuming and laborious because it is an aerial operation. In addition, because the upper contact assembly and the lower contact assembly are exposed, there are problems such as foreign matter overlap and animal hazards, which affect the safety of the equipment. SUMMARY

[0004] Therefore, the utility model wants to solve the technical problem in prior art drop-out fuse installation is laborious, and the safety performance is low, so as to provide a full insulation drop-out fuse which is quick and convenient to install and has high safety performance.

[0005] Therefore, the utility model provides a full insulation drop-out fuse, which comprises an insulator, an upper contact assembly, a lower contact assembly, a fuse tube assembly, two connecting terminals, and an insulating cover. The two connecting terminals are fixedly connected with the upper contact assembly and the lower contact assembly, respectively. The connecting terminal comprises a connecting column and at least one first bolt arranged on the connecting column. The connecting column is formed with a wire cavity for inserting a cable. The first bolt is used to press and fix the cable and the connecting column. The insulating cover is used to shield the upper contact assembly, the lower contact assembly, and the connecting terminal, and is provided with an opening for the movable fuse tube assembly.

[0006] The insulating cover comprises a first cover part and a second cover part which are detachably arranged. The first cover part and the second cover part are fixed by a second bolt or a buckle.

[0007] 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 with the connecting terminal, and the other end is fixedly connected with the ear shaft seat. The ear shaft is rotatably installed on the ear shaft seat and is fixedly connected with the bottom of the fuse tube assembly. The insulating cover is detachably installed with a buffer pad which abuts against the ear shaft when the ear shaft rotates.

[0008] The buffer pad is installed between the first shell part and the second shell part, and T-shaped clamping blocks are formed on both sides of the buffer pad, and the first shell part and the second shell part are both formed with T-shaped clamping grooves which are adapted to clamp the T-shaped clamping blocks.

[0009] The insulating shell is provided with a first cover at the cable cavity opening, and the first cover is formed with a horn-shaped opening for guiding the cable to be inserted.

[0010] The inner wall of the horn-shaped opening is provided with annular protrusions which are spaced apart along the cable insertion direction.

[0011] The outer wall of the first cover is provided with a second clamping block, and the inner wall of the insulating shell is provided with a second clamping groove which is adapted to clamp the second clamping block.

[0012] A second cover is installed on the insulating shell for shielding the first bolt and the second bolt.

[0013] The fuse tube assembly comprises a fuse tube, an inner lining metal tube arranged inside the fuse tube, and an arc shortening rod arranged at the upper end of the inner lining metal tube.

[0014] The technical scheme of the utility model has the following advantages:

[0015] 1. The full insulation drop-out fuse provided by the utility model is provided with a wiring terminal and an insulating shell, the wiring terminal comprises a wiring column and at least one first bolt arranged on the wiring column, the wiring column is formed with a cable cavity for inserting a cable, and when wiring, only the cable needs to be inserted into the cable cavity, and then the first bolt is pressed to fix, which is simpler than the existing technology which needs to install a wiring nose; in addition, the insulating shell is used for shielding the upper contact assembly, the lower contact assembly and the wiring terminal, so that problems such as foreign matter overlap and animal hazards are avoided, and the insulation between phases is ensured.

[0016] 2. The full insulation drop-out fuse provided by the utility model is provided with a buffer pad which is in abutment with an ear shaft when the ear shaft rotates and is detachably installed on the insulating shell, so that when the fuse tube assembly falls, the ear shaft rotates relative to the ear shaft seat, the buffer pad can effectively buffer the impact force of the ear shaft, the ear shaft is effectively prevented from directly impacting the wiring terminal, and the service life of the equipment is prolonged; further, when the buffer pad is installed, the T-shaped clamping block on one side is clamped into the T-shaped clamping groove of the first shell part, then the second shell part is buckled with the first shell part, the T-shaped clamping block on the other side of the buffer pad is clamped into the T-shaped clamping groove of the second shell part, finally the second shell part and the first shell part are assembled and fixed through the second bolt or the buckle nail, so that the buffer pad is fixed on the insulating shell, and the T-shaped clamping block and the T-shaped clamping groove have the advantages of simple structure and convenient disassembly and assembly.

[0017] 3.The full-insulation drop-out fuse provided by the utility model, the insulating cover has a first cover arranged at the wire cavity opening, the first cover is shaped with a horn mouth for guiding the insertion of the cable, the inner wall of the horn mouth is provided with annular ribs which are distributed at intervals along the cable insertion direction, the annular ribs are in abutment with the outer wall of the cable, and the sealing effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Figure 1 It is a perspective view of the full-insulation drop-out fuse of the utility model;

[0020] Figure 2 It is an explosion structure schematic view of the full-insulation drop-out fuse;

[0021] Figure 3 It is a structure schematic view of the full-insulation drop-out fuse after removing the insulating cover;

[0022] Figure 4 It is a sectional view of the full-insulation drop-out fuse;

[0023] Figure 5 It is Figure 4 It is an enlarged structure schematic view of part A;

[0024] Figure 6 It is Figure 4 It is an enlarged structure schematic view of part B;

[0025] Figure 7 It is an assembly schematic view of the buffer block and the insulating cover;

[0026] Figure 8 It is an explosion structure schematic view of the buffer block and the insulating cover.

[0027] Explanation of reference numerals: 1, insulator; 2, upper contact assembly; 3, lower contact assembly; 4, fuse tube assembly; 5, terminal; 6, post; 7, first bolt; 8, insulating housing; 9, opening; 10, second bolt; 11, first housing part; 12, second housing part; 13, lower conductive plate; 14, trunnion seat; 15, trunnion; 16, cushion pad; 17, T-shaped clamping block; 18, T-shaped clamping slot; 19, first cover; 20, trumpet mouth; 21, annular protruding rib; 22, second clamping block; 23, second clamping slot; 24, second cover; 25, fuse tube; 26, inner lining metal tube; 27, arc shortening rod; 28, wire cavity. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0032] EMBODIMENT

[0033] The present embodiment provides a full-insulation drop-out fuse, like Figure 1 , Figure 2 and Figure 3As shown, it comprises an insulator 1, an upper contact assembly 2, a lower contact assembly 3, a fuse tube assembly 4, two terminal posts 5, an insulating cover 8 and a buffer pad 16.

[0034] The two terminal posts 5 are fixedly connected with the upper contact assembly 2 and the lower contact assembly 3 respectively, as shown in Figure 4 and Figure 5 As shown, the terminal post 5 comprises a terminal post 6 and two first bolts 7 arranged on the terminal post 6, the terminal post 6 is shaped with a wire cavity 28 for cable insertion, and the first bolts 7 are used to press and fix the cable and the terminal post 6.

[0035] The insulating cover 8 is used to shield the upper contact assembly 2, the lower contact assembly 3 and the terminal post 5, as shown in Figure 1 As shown, the insulating cover 8 is provided with an opening 9 for the movement of the fuse tube assembly 4. The insulating cover 8 comprises a first cover part 11 and a second cover part 12 which are arranged in a left-right clamping manner, and the first cover part 11 and the second cover part 12 are fixed by second bolts 10 or buckles, as shown in Figure 5 and Figure 6 As shown, the insulating cover 8 is provided with a first cover 19 arranged at the opening of the wire cavity 28, and a second cover 24 for shielding the first bolts 7 and the second bolts 10. The first cover 19 is shaped with a flared mouth 20 for guiding the cable insertion, and the inner wall of the flared mouth 20 is provided with annular protrusions 21 which are distributed along the cable insertion direction and are in close contact with the outer wall of the cable, so that the sealing effect is better. The outer wall of the first cover 19 is provided with a second clamping block 22, and the inner wall of the insulating cover 8 is provided with a second clamping groove 23 which is adapted to clamp the second clamping block 22.

[0036] The upper contact assembly 2 and the lower contact assembly 3 are respectively installed on the upper part and the lower part of the insulator 1, as shown in Figure 3 As shown, the lower contact assembly 3 comprises a lower conductive plate 13, an ear shaft seat 14 and an ear shaft 15, one end of the lower conductive plate 13 is fixedly connected with the terminal post 5, the other end is fixedly connected with the ear shaft seat 14, the ear shaft 15 is rotatably installed on the ear shaft seat 14 and is fixedly connected with 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 structure and working principle will not be described in detail.

[0037] The buffer pad 16 is detachably installed on the insulating cover 8 and is used to abut against the ear shaft 15 when it rotates, as shown in Figure 7 , Figure 8As shown, the buffer pad 16 is installed between the first casing part 11 and the second casing part 12, and T-shaped clamping blocks 17 are formed on both sides of the buffer pad 16, the first casing part 11 and the second casing part 12 are both formed with T-shaped clamping grooves 18 which are adapted to clamp the T-shaped clamping blocks 17.

[0038] The fuse tube assembly 4 comprises a fuse tube 25, an inner lining metal tube 26 arranged inside the fuse tube 25, and an arc shortening rod 27 arranged at the upper end of the inner lining metal tube 26.

[0039] The full-insulation drop-out fuse provided by the utility model, through setting the wiring terminal 5 and the insulating casing 8, the wiring terminal 5 includes the wiring column 6 and the first bolt 7 arranged on the wiring column 6, the wiring column 6 is formed with the wire cavity 28 for inserting the cable, when wiring, only need to insert the cable into the wire cavity 28, and then press and fix through the first bolt 7, compared with the mode of needing to install the wiring nose in the prior art, the wiring is simpler, in addition, the insulating casing is used for shielding the upper contact assembly, the lower contact assembly and the wiring terminal, so that the problems such as foreign matter lapping and animal hidden danger are avoided, and the phase-to-phase insulation is guaranteed.

[0040] Obviously, the above embodiments are only examples for clearly illustrating, and not limit the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A totally insulated drop-out fuse comprising an insulator (1), an upper contact assembly (2), a lower contact assembly (3) and a fuse tube assembly (4), the fuse tube assembly (4) comprising a fuse tube (25), an inner lining metal tube (26) arranged inside the fuse tube (25), an arc shortening rod (27) arranged at the upper end of the inner lining metal tube (26), characterized in that, Also include: Two terminal (5), respectively, with the upper contact assembly (2) and lower contact assembly (3) fixed connection, the terminal (5) includes terminal post (6), and at least one first bolt (7) is arranged on the terminal post (6), the terminal post (6) is formed with the wire cavity (28) for cable insertion, the first bolt (7) is used for tightly fixing the cable with the terminal post (6); Insulation cover (8) is used for shielding the upper contact assembly (2), the lower contact assembly (3) and the terminal (5), and is provided with an opening (9) for the fuse tube assembly (4) to move.

2. The totally enclosed fuse block of claim 1, wherein: The insulation cover (8) includes a first cover part (11) and a second cover part (12) arranged in a snap-fit manner, and the first cover part (11) and the second cover part (12) are fixed by a second bolt (10) or a snap pin.

3. The totally enclosed fuse block of claim 2 wherein, The lower contact assembly (3) includes a lower conductive plate (13), an ear shaft seat (14) and an ear shaft (15), one end of the lower conductive plate (13) is fixedly connected with the terminal (5), the other end is fixedly connected with the ear shaft seat (14), the ear shaft (15) is rotatably installed on the ear shaft seat (14), and the bottom of the fuse tube assembly (4) is fixedly connected with the ear shaft (15), and the insulation cover (8) is detachably installed with a buffer pad (16) abutting against the ear shaft (15) when the ear shaft (15) rotates.

4. The totally enclosed fuse block of claim 3 wherein, The buffer pad (16) is installed between the first cover part (11) and the second cover part (12), and T-shaped clamping blocks (17) are formed on both sides of the buffer pad (16), and the first cover part (11) and the second cover part (12) are both formed with T-shaped clamping grooves (18) matched with the T-shaped clamping blocks (17).

5. The all-insulated drop-out fuse of claim 1, wherein, The insulation 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 horn mouth (20) for guiding the cable insertion.

6. The totally enclosed fuse block of claim 5 wherein, The inner wall of the horn mouth (20) has annular protrusions (21) distributed along the cable insertion direction.

7. The totally enclosed fuse block of claim 5 wherein, A second clamping block (22) is arranged on the outer wall of the first cover (19), and a second clamping groove (23) matched with the second clamping block (22) is arranged on the inner wall of the insulation cover (8).

8. The totally enclosed fuse block of claim 2, wherein, A second cover (24) is arranged on the insulation cover (8) for shielding the first bolt (7) and the second bolt (10).

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