阅读说明：本技术 熔断器 (Fuse protector ) 是由 束楠 陈军强 田洪滨 马振刚 余鑫昌 张永海 马俊 于 2019-10-11 设计创作，主要内容包括：本发明提供了一种熔断器,包括：支架组件；熔断丝穿设在熔丝管内,第一接头结构,包括第一接头部和设置在第一接头部上的第一导电部以及第一弹性件,第一接头部可移动地设置在熔丝管的第一端,第一弹性件向第一接头部施加远离熔丝管的第一端的弹力；第二接头结构,包括第二接头部和设置在第二接头部上的第二弹性件,其中,熔断丝的第一端连接在第一接头部上,熔断丝的第二端连接在第二接头部上,熔断丝的第一端与第一接头部同步运动,熔断丝处于熔断的状态下,第一接头部上移,第一导电部与支架组件的第一端分离,第二弹性件与熔断丝分离。本申请的技术方案有效解决了相关技术中的熔丝过电流熔断后不易快速断开,产生较大电弧的问题。(The present invention provides a fuse, comprising: a bracket assembly; the fuse wire penetrates through the fuse tube, the first joint structure comprises a first joint part, a first conductive part and a first elastic part, the first conductive part is arranged on the first joint part, the first joint part is movably arranged at the first end of the fuse tube, and the first elastic part applies elastic force far away from the first end of the fuse tube to the first joint part; the second joint structure comprises a second joint part and a second elastic part arranged on the second joint part, wherein the first end of the fuse wire is connected to the first joint part, the second end of the fuse wire is connected to the second joint part, the first end of the fuse wire and the first joint part move synchronously, the fuse wire is in a fusing state, the first joint part moves upwards, the first conductive part is separated from the first end of the support component, and the second elastic part is separated from the fuse wire. The technical scheme of the application effectively solves the problem that the fuse wire in the related technology is not easy to be quickly disconnected after being fused due to overcurrent and generates larger electric arc.)

1. A fuse, comprising:

a bracket assembly;

the fuse wire comprises a fuse tube (20) and a fuse wire, wherein the fuse wire penetrates through the fuse tube (20), and the fuse tube (20) is detachably matched with the bracket component;

a first joint structure (30) including a first joint portion (31) and a first conductive portion (32) provided on the first joint portion (31), the first conductive portion (32) being detachably engaged with the first end of the holder assembly, and a first elastic member (33), the first joint portion (31) being movably provided at the first end of the fuse tube (20), the first elastic member (33) applying an elastic force to the first joint portion (31) away from the first end of the fuse tube (20);

a second joint structure (40) including a second joint portion (41) and a second elastic member (42) provided on the second joint portion (41), the second joint portion (41) being detachably fitted with the second end of the fuse tube (20), the second elastic member (42) being capable of abutting against the fuse,

wherein, the first end of fusible link is connected on first joint portion (31), the second end of fusible link is connected on second joint portion (41), the first end of fusible link with first joint portion (31) simultaneous movement, the fusible link is under the state of fusing, first joint portion (31) shifts up, first conductive part (32) with the first end separation of bracket component, second elastic component (42) with the fusible link separation.

2. A fuse as per claim 1, characterised in that the first elastic element (33) is arranged inside the first joint part (31), the first elastic element (33) being located between the top end of the first joint part (31) and the first end of the fuse tube (20).

3. A fuse as per claim 2, characterised in that it further comprises a sleeve (50) arranged on the first end of the fuse tube (20), the first joint part (31) being sleeved outside the sleeve (50), the first joint part (31) being connected with the sleeve (50) by means of a threaded structure.

4. A fuse as per claim 3, characterised in that said threaded structure comprises an external thread (51) provided on the external wall of said sleeve (50) and an internal thread (311) provided on the internal wall of said first joint portion (31), said internal thread (311) being located below said external thread (51), said first elastic element (33) being located between the top end of said first joint portion (31) and the top of said sleeve (50).

5. A fuse as per claim 1, characterised in that the bracket assembly comprises a bracket (11) and a first contact structure (12) arranged on a first end of the bracket (11) and a second contact structure (13) arranged on a second end of the bracket (11), the first conductive portion (32) being able to come into contact with the first contact structure (12), the second joint structure (40) being hung on the second contact structure (13).

6. A fuse as per claim 5, characterised in that said first contact structure (12) comprises:

a first main frame (121) connected to a first end of the bracket (11);

a second conductive section (122) and a third conductive section (123) that are provided at intervals on the first main frame (121);

and an adjustment structure for connecting the second conductive section (122) and the third conductive section (123) to the first main frame (121).

7. The fuse of claim 6, wherein the adjustment structure comprises:

the screw (124) is arranged on the first main frame (121) in a penetrating mode, and two ends of the screw (124) respectively protrude out of the first main frame (121) along the axis of the screw;

a third elastic element (125) and a first nut (126) which are sequentially sleeved on the first end of the screw rod (124), and the first end of the second conductive part (122) is sleeved on the first end of the screw rod (124) and clamped between the third elastic element (125) and the first main frame (121);

a fourth elastic element (127) and a second nut (128) which are sequentially sleeved on the second end of the screw rod (124), a first end of the third conductive part (123) is sleeved on the second end of the screw rod (124) and clamped between the fourth elastic element (127) and the first main frame (121),

wherein a second end of the second conductive portion (122) and a second end of the third conductive portion (123) are bent in directions away from each other.

8. The fuse according to claim 5,

the second contact structure (13) comprises:

a second main frame (131) connected to a second end of the bracket (11);

a fourth conductive part (132) and a hook (133) that are provided at an interval on the second main frame (131);

the second joint portion (41) includes:

a tube body (411) connected to a second end of the fuse tube (20);

a projection (412) provided on the tube (411);

a boss (413) provided on the projection (412),

the second elastic piece (42) is an elastic piece, the fixed end of the elastic piece is connected to the protruding portion (412), the convex column (413) is hung on the hook (133), the fourth conductive portion (132) is in abutting fit with the tube body (411), and the free end of the elastic piece is in abutting press fit with the fuse.

9. A fuse as per claim 5, characterised in that the bracket assembly also comprises a first plate (14) connected between the first end of the bracket (11) and the first contact structure (12), a second plate (15) connected between the second end of the bracket (11) and the second contact structure (13) and a fixing plate (16) connected in the middle of the bracket (11), the first plate (14) and the second plate (15) being bent.

10. A fuse as per claim 1, characterised in that said first joint structure (30) further comprises a nut cover (34) arranged on said first joint portion (31), said nut cover (34) and said first end of said first joint portion (31) sandwiching said first end of said fuse wire, said fuse further comprising a rain shield (60) arranged on said first contact structure (12), said rain shield (60) being arranged over said first contact structure (12) and said nut cover (34).

Technical Field

The invention relates to the field of safety tools, in particular to a fuse.

Background

The drop-out fuse is an outdoor high-voltage protection electric appliance, and is generally arranged on a high-voltage side of a transformer or a distribution line branch line and used for short circuit and overload protection of the transformer and the line and load current distribution and combination. The drop-out fuse is one of the most commonly used protection elements in the current power system, and the working principle of the drop-out fuse is that after the current exceeds a specified value for a period of time, the heat generated by the fuse melts the melt, so that the circuit is disconnected, and the electrical equipment is protected. The drop-out fuse has the characteristics that: simple structure, effectiveness, low cost, durability, convenient installation and the like.

In the prior art, the high-voltage drop-out fuse comprises an insulating support, a moving contact, a static contact and a fuse tube. Although the high-voltage drop-out fuse can meet the daily work requirement, the following problems still exist:

1) after the fuse wire is fused by overcurrent, the self weight of the fuse wire tube falls, the melting point distance is too slow to be disconnected quickly, and a larger electric arc is generated;

2) the position and the distance of the contact are manually adjusted to tighten the fuse, so that the fuse is difficult to control, the contact of the contact is not firm, the conductivity is poor, the heat is easy to generate, and the misoperation is generated;

3) the movable element at the lower end of the fuse tube has a heavy structure, the fuse wire and the fuse tube are inconvenient to replace, and the fuse wire is easy to be broken by a fixed bolt;

4) the contact at the upper end of the fuse is easy to be blocked and is not easy to be opened and closed;

5) the drop-out fuses of the same voltage class are inconsistent in size and spacing, fuse specifications are not uniform, fuses produced by various manufacturers are not universal, and daily maintenance is inconvenient.

Disclosure of Invention

The invention mainly aims to provide a fuse to solve the problems that a fuse wire in the related art is not easy to be quickly disconnected after being blown by overcurrent and generates a large arc.

In order to achieve the above object, the present invention provides a fuse including: a bracket assembly; the fuse wire penetrates through the fuse wire tube, and the fuse wire tube is detachably matched with the support component; a first joint structure including a first joint part, a first conductive part disposed on the first joint part, and a first elastic member, the first conductive part being detachably engaged with the first end of the bracket assembly, the first joint part being movably disposed at the first end of the fuse tube, the first elastic member applying an elastic force to the first joint part away from the first end of the fuse tube; the second joint structure comprises a second joint part and a second elastic part arranged on the second joint part, the second joint part is detachably matched with a second end of the fuse tube, the second elastic part can be abutted against the fuse, wherein the first end of the fuse is connected to the first joint part, the second end of the fuse is connected to the second joint part, the first end of the fuse moves synchronously with the first joint part, the fuse is in a fused state, the first joint part moves upwards, the first conductive part is separated from the first end of the support component, and the second elastic part is separated from the fuse.

Further, a first elastic member is provided in the first joint portion, the first elastic member being located between a tip end of the first joint portion and the first end of the fuse tube.

Further, the fuse still includes the sleeve that sets up on the first end of fuse tube, and telescopic outside is established to first joint portion cover, and first joint portion passes through helicitic texture and muffjoint.

Further, the thread structure comprises an external thread arranged on the outer wall of the sleeve and an internal thread arranged on the inner wall of the first joint part, the internal thread is located below the external thread, and the first elastic piece is located between the top end of the first joint part and the top of the sleeve.

Further, the bracket assembly includes a bracket and a first contact structure disposed on a first end of the bracket and a second contact structure disposed on a second end of the bracket, the first conductive portion is capable of contacting the first contact structure, and the second joint structure is hung on the second contact structure.

Further, the first contact structure includes: the first main frame is connected with the first end of the bracket; a second conductive part and a third conductive part which are arranged on the first main frame at intervals; and an adjustment structure for connecting the second conductive section and the third conductive section to the first main frame.

Further, the adjustment structure includes: the screw rod penetrates through the first main frame, and two ends of the screw rod respectively protrude out of the first main frame along the axis of the screw rod; the third elastic piece and the first nut are sequentially sleeved on the first end of the screw rod, and the first end of the second conductive part is sleeved on the first end of the screw rod and clamped between the third elastic piece and the first main frame; and the fourth elastic element and the second nut are sequentially sleeved on the second end of the screw rod, the first end of the third conductive part is sleeved on the second end of the screw rod and is clamped between the fourth elastic element and the first main frame, and the second end of the second conductive part and the second end of the third conductive part are bent towards the direction of deviating from each other.

Further, the second contact structure includes: the second main frame is connected with the second end of the bracket; the fourth conductive part and the hook are arranged on the second main frame at intervals; the second joint portion includes: the tube body is connected to the second end of the fuse tube; the bulge is arranged on the tube body; the convex column is arranged on the protruding portion, wherein the second elastic piece is a spring piece, the fixed end of the spring piece is connected to the protruding portion, the convex column is hung on the hook, the fourth conductive portion is in butt fit with the pipe body, and the free end of the spring piece is in butt fit with the fuse wire.

Furthermore, the bracket component also comprises a first plate body connected between the first end of the bracket and the first contact structure, a second plate body connected between the second end of the bracket and the second contact structure, and a fixing plate connected to the middle part of the bracket, wherein the first plate body and the second plate body are bent.

Further, first joint design still includes that the setting is at first joint portion upper nut lid, and the first end of nut lid and first joint portion presss from both sides the first end of establishing the fuse, and the fuse still includes the rain-proof cover that sets up on first contact structure, and rain-proof cover covers and establishes the top at first contact structure and nut lid.

By applying the technical scheme of the invention, the fuse comprises: bracket component, fuse tube, fuse, first joint design and second joint design. The bracket assembly is connected in series in the power line. The fuse wire penetrates through the fuse wire tube, and the fuse wire tube is detachably matched with the support component. The first joint structure includes a first joint portion, a first conductive portion disposed on the first joint portion, and a first elastic element. The first conductive part is detachably matched with the first end of the bracket component, the first joint part is movably arranged at the first end of the fuse tube, and the first elastic part applies elastic force far away from the first end of the fuse tube to the first joint part. The second joint structure includes a second joint portion and a second elastic member disposed on the second joint portion, the second joint portion being detachably fitted with the second end of the fuse tube. When the fuse wire is in an unblown state, the fuse wire pulls the first joint part to overcome the elasticity of the first elastic piece, the first joint part can move downwards, the first conductive part is contacted with the first end of the bracket component, and the second elastic piece can be abutted against the fuse wire. In this application, the first end of fusible link is connected on first joint portion, and the second end of fusible link is connected on second joint portion, the first end and the first joint portion simultaneous movement of fusible link. The fuse wire is in under the state of not fusing, and the fuse wire withstands first joint portion, and elastic deformation takes place for first elastic component, and first joint portion is in the contact position, and first conductive part contacts with the first end of bracket component, and second elastic component can support with the fuse wire and press mutually. When the fuse wire is fused, the fuse wire is disconnected, the first elastic piece resets, the first joint part moves upwards, and the first conductive part is separated from the first end of the bracket component. Meanwhile, the second elastic piece resets and exerts an elastic force on the fuse wire, and a part of the fuse wire connected with the second joint part can be quickly drawn out of the fuse tube, so that the second elastic piece is separated from the fuse wire. Under the combined action of the first elastic part and the second elastic part, the two ends of the fuse wire can be quickly pulled away to a safe distance, and a quick-break arc extinguishing effect is achieved. Meanwhile, the fuse tube falls down by utilizing the self weight to form an obvious disconnection point. Therefore, the technical scheme of the application can solve the problems that the fuse wire in the related technology is not easy to be quickly disconnected after being blown by overcurrent and generates larger electric arc.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a partially exploded schematic view of an embodiment of a fuse in accordance with the present invention;

FIG. 2 shows a perspective schematic view of a first tab construction of the fuse of FIG. 1;

FIG. 3 shows a schematic side view of a first tab construction of the fuse of FIG. 1;

FIG. 4 is a schematic side view of the fuse of FIG. 1 with the canister attached to the fuse tube;

FIG. 5 is a schematic bottom view of the fuse of FIG. 1 with the canister attached to the fuse tube;

FIG. 6 shows a schematic view of a first tab construction of the fuse of FIG. 1;

FIG. 7 shows a schematic front view of a nut cover of the fuse of FIG. 1;

FIG. 8 shows a schematic front view of a second tab construction of the fuse of FIG. 1;

FIG. 9 shows a schematic left side view of a second tab construction of the fuse of FIG. 1;

FIG. 10 shows a schematic right-side view of a second tab construction of the fuse of FIG. 1;

figure 11 shows a schematic front view of a first contact structure of the fuse of figure 1;

figure 12 shows a schematic top view of a first contact structure of the fuse of figure 1;

figure 13 shows a left side schematic view of a first contact structure of the fuse of figure 1;

FIG. 14 shows a left side schematic view of a first mainframe of the fuse of FIG. 1;

FIG. 15 shows a left side schematic view of a first nut of the fuse of FIG. 1;

FIG. 16 shows a left side schematic view of a pad of the fuse of FIG. 1;

figure 17 shows a front view schematic of a holder of the fuse of figure 1;

figure 18 shows a schematic top view of a holder of the fuse of figure 1;

figure 19 shows a schematic front view of a second contact structure of the fuse of figure 1;

figure 20 shows a side view schematic diagram of a second contact structure of the fuse of figure 1;

figure 21 shows a schematic top view of a second contact structure of the fuse of figure 1;

FIG. 22 shows a front view schematic of a rain shield of the fuse of FIG. 1; and

figure 23 shows a side view schematic of a rain shield of the fuse of figure 1.

Wherein the figures include the following reference numerals:

11. a support; 12. a first contact structure; 121. a first main frame; 122. a second conductive portion; 123. a third conductive portion; 124. a screw; 125. a third elastic member; 126. a first nut; 127. a fourth elastic member; 128. a second nut; 129. a support bar; 13. a second contact structure; 131. a second main frame; 132. a fourth conductive portion; 133. hooking; 14. a first plate body; 15. a second plate body; 16. a fixing plate; 17. an insulator; 20. a fuse tube; 30. a first joint structure; 31. a first joint portion; 311. an internal thread; 32. a first conductive portion; 33. a first elastic member; 34. a nut cover; 40. a second joint structure; 41. a second joint portion; 411. a pipe body; 412. a projection; 413. a convex column; 42. a second elastic member; 50. a sleeve; 51. an external thread; 60. a rain cover; 71. a bolt; 73. a screw; 74. and (7) a gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

As shown in fig. 1, the fuse of the present embodiment includes: a bracket assembly, a fuse tube 20, a fuse, a first connector structure 30, and a second connector structure 40. The bracket assembly is connected in series in the power line. The fuse wire is arranged in the fuse tube 20 in a penetrating way, and the fuse tube 20 is matched with the bracket component in a separable way. The first joint structure 30 includes a first joint portion 31, and a first conductive portion 32 and a first elastic piece 33 provided on the first joint portion 31. The first conductive portion 32 is detachably engaged with the first end of the holder assembly, the first terminal portion 31 is movably disposed at the first end of the fuse tube 20, and the first elastic member 33 applies an elastic force to the first terminal portion 31 away from the first end of the fuse tube 20. The second joint structure 40 includes a second joint portion 41 and a second elastic member 42 provided on the second joint portion 41, the second joint portion 41 is detachably fitted to the second end of the fuse tube 20, and the second elastic member 42 can be pressed against the fuse. In this embodiment, the first end of the fuse is connected to the first tab 31, the second end of the fuse is connected to the second tab 41, and the first end of the fuse moves in synchronism with the first tab 31. When the fuse is in a blown state, the first terminal portion 31 moves upward, the first conductive portion 32 is separated from the first end of the bracket assembly, and the second elastic member 42 is separated from the fuse 42.

By applying the technical solution of the present embodiment, the first end of the fuse is connected to the first joint part 31, the first end of the fuse moves synchronously with the first joint part 31, and the second end of the fuse is connected to the second joint part 41. When the fuse is in an unblown state, the fuse pulls the first joint part 31, the first elastic element 33 elastically deforms, the first joint part 31 is in a contact position, the first conductive part 32 is in contact with the first end of the bracket component, and the second elastic element 42 can be abutted against the fuse. When the fuse is blown, the fuse is broken, the first elastic element 33 is reset, the first joint part 31 moves upwards, and the first conductive part 32 is separated from the first end of the bracket component. At the same time, the second elastic member 42 is restored and applies a flicking force to the fuse, and a part of the fuse connected to the second joint part 41 can be rapidly drawn out from the fuse tube 20, and further, the second elastic member 42 is separated from the fuse. Under the combined action of the first elastic member 33 and the second elastic member 42, the two ends of the fuse wire can be quickly pulled apart to a safe distance, so that the quick-break arc extinguishing function is realized. Meanwhile, the fuse tube falls down by utilizing the self weight to form an obvious disconnection point. Therefore, the technical scheme of the embodiment can solve the problems that the fuse wire in the related art is not easy to be quickly disconnected after being blown by overcurrent and generates larger arc.

In the embodiment, the first elastic member 33 and the second elastic member 42 tension the fuse wire in the fuse tube 20, so that the tightness of the fuse wire does not need to be adjusted, the contact position and the distance between the first conductive part and the first end of the bracket assembly do not need to be manually adjusted, and the replacement and maintenance are more convenient and faster.

As shown in fig. 1 to 2, in the present embodiment, the first elastic member 33 is provided in the first joint part 31, and the first elastic member 33 is located between the tip of the first joint part 31 and the first end of the fuse tube 20. Thus, the first elastic member 33 is restrained between the tip end of the first joint part 31 and the first end of the fuse tube 20, preventing the first elastic member 33 from coming out in the axial direction thereof. The first elastic member 33 of the present embodiment has a simple structure, is easy to process, and has a low cost.

As shown in fig. 1 to 4, in the present embodiment, the fuse further includes a sleeve 50 disposed on the first end of the fuse tube 20. The first joint part 31 is sleeved outside the sleeve 50, and the first joint part 31 is connected with the sleeve 50 through a thread structure. By providing the sleeve 50, it is achieved that the fuse tube 20 and the first joint portion 31 can be connected by a threaded structure. Meanwhile, the fuse tube 20 and the sleeve 50 can be separately processed, and the manufacturing cost of the fuse can be reduced. The sleeve 50 is simple in structure and easy to form.

As shown in fig. 2 to 4, in the present embodiment, the thread structure includes an external thread 51 provided on the outer wall of the sleeve 50 and an internal thread 311 provided on the inner wall of the first joint part 31. The first joint part 31 is screwed so that the first joint part 31 moves downward on the sleeve 50, and the entire first joint part 31 can rock on the sleeve 50 when the internal thread 311 is located below the external thread 51. When the first conductive portion 32 is separated from the first end of the bracket assembly, the male screw 51 can block the female screw 311, preventing the first connector portion 31 from moving upward. With the first conductive portion 32 separated from the first end of the bracket assembly, the first resilient element 33 is located between the top end of the first joint portion 31 and the top of the sleeve 50. The first elastic member 33 can block the internal thread 311 and prevent the first joint part 31 from further moving downward. The external thread 51 and the internal thread 311 are matched, so that the structure is simple, and the first joint part 31 is more convenient to assemble on the sleeve 50. The first elastic member is a spring, the tip of the first joint portion 31 is contracted, and the inner diameter of the tip of the first joint portion 31 is smaller than the inner diameter of the first elastic member.

As shown in fig. 1, 6 and 7, the first joint structure 30 further includes a nut cover 34 disposed on the first joint portion 31, and the nut cover 34 and the first end of the first joint portion 31 sandwich the first end of the fusible link. The nut cover 34 prevents foreign objects from entering the first joint portion 31, thereby shielding the foreign objects. The nut cover 34 is screwed to the first joint portion 31. The first joint part 31 is a copper structure formed by a casting process. The first joint part 31 preferably has an outer diameter of 4cm, an inner diameter of 3.4cm, a wall thickness of 0.2cm and a nominal diameter of 0.1 cm. The top of the first joint part 31 is provided with a hole with the diameter of 1.5cm, and the fusible link is installed in the hole with the diameter of 1.5cm and fixed by a nut cover.

As shown in fig. 5, in the present embodiment, the fuse further includes a screw 73 connecting the sleeve 50 and the first end of the fuse tube 20, and the sleeve 50 is fixed to the first end of the fuse tube 20 by the screw 73.

As shown in fig. 1, 11-16, the rack assembly includes a rack 11 and a first contact structure 12 disposed on a first end of the rack 11 and a second contact structure 13 disposed on a second end of the rack 11. The first conductive portion 32 is capable of contacting the first contact structure 12 and the second contact structure 40 is suspended from the second contact structure 13. In this manner, the first contact structure 12 is connected to the power line to facilitate conduction of current to the first end of the rack assembly. The second contact structure 13 is connected to the power line to facilitate conduction of current to the second end of the rack assembly. The second contact structure 13 can be hooked on the second joint structure 40, on one hand, the second joint structure 40 and the fuse tube 20 are prevented from falling, and on the other hand, the fuse tube 20 is convenient to replace. The length of the holder 11 of the present embodiment is preferably 65cm, and the length of the fuse tube 20 is preferably 60 cm.

As shown in fig. 1, 11-14, 19 and 20, the first contact structure 12 includes: a first main frame 121, a second conductive part, a third conductive part 123, and an adjustment structure. The first main frame 121 is coupled to a first end of the bracket 11. The second conductive part 122 and the third conductive part 123 are provided on the first main frame 121 with an interval therebetween. The second conductive portion 122 and the third conductive portion 123 sandwich the first conductive portion 32. The second conductive part 122 and the third conductive part 123 are provided so that the first main frame 121 can be electrically connected to the first conductive part 32. In addition, when the fusible link is not fused, the second conductive portion 122 and the third conductive portion 123 can fix the first conductive portion 32, and the first conductive portion 32 can be prevented from being separated from the first contact structure 12. The adjustment structure connects the second conductive portion 122 and the third conductive portion 123 to the first main frame 121. The adjusting structure can adjust the clamping force of the first conductive part 32 clamped by the second conductive part 122 and the third conductive part 123, so that on one hand, the current conduction is realized when the fuse wire is in an unblown state; on the other hand, it is ensured that the first conductive part 32 can be separated from the first contact structure 12 in the blown state of the fuse. The above structure makes the first contact structure 12 firm, stable, non-deformable, good in insulating property, and strong and durable. The first main frame 121 of the present embodiment is preferably a copper convex frame. The second conductive part 122 and the third conductive part 123 are preferably conductive blades, and the conductive blades are copper square bars with the dimensions of 12cm in length, 1.5cm in width and 0.3cm in thickness.

As shown in fig. 1, 11 to 16, the adjustment structure includes: a screw 124, a third elastic member 125, a first nut 126, a fourth elastic member 127, and a second nut 128. The screw 124 is disposed through the first main frame 121, and two ends of the screw 124 respectively protrude out of the first main frame 121 along an axis thereof. The third elastic member 125 and the first nut 126 are sequentially fitted over the first end of the screw 124. The first end of the second conductive part 122 is sleeved on the first end of the screw 124 and is sandwiched between the third elastic element 125 and the first main frame 121. Thus, the first nut 126 applies a force to the third elastic member 125, and the magnitude of the first end force with which the first nut 126 clamps the second conductive portion 122 can be easily adjusted, so that the second conductive portion 122 can be more firmly contacted with the first main frame 121, the contact surface can be wider, and the conductivity can be higher. The fourth elastic member 127 and the second nut 128 are sequentially fitted over the second end of the screw 124. The first end of the third conductive part 123 is sleeved on the second end of the screw 124 and is sandwiched between the fourth elastic element 127 and the first main frame 121. Thus, the second nut 128 applies a force to the fourth elastic member 127, and the magnitude of the first end force with which the second nut 128 clamps the third conductive portion 123 can be easily adjusted, so that the third conductive portion 123 is more firmly contacted with the first main frame 121, the contact surface is wider, and the conductivity is higher.

In the present embodiment, the second end of the second conductive portion 122 and the second end of the third conductive portion 123 are bent in directions away from each other. Thus, an opening is formed between the second end of the second conductive part 122 and the second end of the third conductive part 123, so that the first conductive part 32 can be smoothly inserted between the second conductive part 122 and the third conductive part 123, the action is smooth, and the installation efficiency is improved, thereby avoiding the phenomena of blocking and difficulty in opening and closing. The third elastic member 125 and the fourth elastic member 127 of the present embodiment are preferably springs. The screw 124, the third elastic element 125, the first nut 126, the fourth elastic element 127 and the second nut 128 of the present embodiment are simple in structure, are standard elements, are easy to replace and are convenient to assemble. In this embodiment, the number of the screws 124 is preferably two, the number of the third elastic members 125 is preferably four, the number of the first nuts 126 is preferably four, the number of the fourth elastic members 127 is preferably four, and the number of the second nuts 128 is preferably four. Thus, the connection is reliable, and the clamping force can be conveniently adjusted.

As shown in fig. 11, the first main frame 121 includes a first main frame body and a support rod 129 provided on the first main frame body, and the screw 124 is inserted into the support rod 129. The number of the support rods 129 is two, and the two support rods 129 are arranged on the first main frame body at intervals. The support rod 129 is arranged to facilitate the connection of the first main frame body with the screw 124. The support bar 129 is simple in structure and easy to form.

In the embodiment, the first conductive part 32 is in a sheet shape, one end of the first conductive part 32, which is far away from the first end of the fuse tube 20, transitions in an arc shape, and when the second conductive part 122 and the third conductive part 123 clamp the first conductive part 32, the support rod 129 can block the first conductive part 32, so as to prevent the first conductive part 32 from moving continuously, and thus, the purpose of limiting is achieved.

As shown in fig. 11 and 16, in the present embodiment, the adjusting structure further includes a plurality of spacers 74 disposed on the screw 124, one spacer 74 is disposed between the first nut 126 and the third elastic member 125, one spacer 74 is disposed between the third elastic member 125 and the second conductive portion 122, one spacer 74 is disposed between the fourth elastic member 127 and the second nut 128, and one spacer 74 is disposed between the second nut 128 and the third conductive portion 123. The spacer 74 described above can increase the contact area between the two structures, making the connection more stable.

As shown in fig. 19 to 21, in the present embodiment, the second contact structure 13 includes: a second main frame 131, a fourth conductive portion 132, and a hook 133. The second main frame 131 is coupled to the second end of the bracket 11. The fourth conductive portion 132 and the hook 133 are provided on the second main frame 131 at an interval. The hooks 133 are provided at intervals on the second main frame 131, and the opening shape of the hooks 133 is rectangular parallelepiped. The fourth conductive portion 132 is preferably a spring conductive copper sheet for conducting current. The second main frame 131 has two holes at a top end position thereof in a lateral direction, and the second main frame 131 is fixed to the second end of the bracket 11 by two bolts 71 passing through the two holes. The structure makes the second contact structure 13 firm, stable, non-deformable, good in insulating property, and strong and durable. The bottom end of the second main frame 131 is a sheet structure, and two holes are formed in the bottom end of the second main frame 131 in the longitudinal direction, so that a drainage wire can be installed on the second main frame 131. The second contact structure 13 of the present embodiment is preferably a copper steel plate formed by forging. The copper structure is firm and durable.

As shown in fig. 1, 8 to 10, in the present embodiment, the second joint part 41 includes: tube 411, projection 412 and boss 413. Thus, the second joint part 41 has a simple structure, and the structural weight of the lower joint in the related art can be reduced, so that the second joint part 41 is more lightweight. The body 411 is connected to the second end of the fuse tube 20. The projection 412 is provided on the tube 411. The boss 413 is disposed on the protrusion 412. The second elastic element 42 is a spring, the fixed end of the spring is connected to the protrusion 412, and the protrusion 413 is hung on the hook 133. The fourth conductive portion 132 is abutted against and matched with the tube 411, and the free end of the elastic sheet is abutted against and matched with the fuse. The dual flow guidance of the second contact structure 13 is enabled by the stud 413 and the fourth conductive portion 132. Meanwhile, the contact between the convex column 413 and the hook 133 and the contact between the fourth conductive part 132 and the tube 411 are more stable and firm in contact, and are not easy to generate heat. The body 411 is preferably a copper sleeve, and the body 411 is attached to the second end of the fuse tube 20 by rivets. The second end of the fuse is connected to the protrusion 412 by the bolt 71, and the protrusion 412 and the boss 413 form a T shape, so that the second joint part 41 is hung on the hook 133. The copper structure is firm and durable. The spring plate is preferably made of stainless steel, and is firm and durable. In this embodiment, the side wall surface of the protrusion 412 is coplanar with the side surface of a portion of the tube 411, and the protrusion 412 and the tube 411 are connected together by welding.

As shown in fig. 1, 17 and 18, in this embodiment, the rack assembly further includes a first plate 14 connected between the first end of the rack 11 and the first contact structure 12, a second plate 15 connected between the second end of the rack 11 and the second contact structure 13, and a fixing plate 16 connected to the middle of the rack 11. The first plate 14 and the second plate 15 are both bent.

In this embodiment, the bracket assembly further includes a plurality of insulators 17 disposed on the bracket 11. The insulator 17 is preferably made of silica gel. The plurality of insulators 17 include two kinds of insulators having different diameters and high strength, which are alternately stacked. One of the plurality of insulators 17 preferably has a diameter of 14cm and the other insulator preferably has a diameter of 12 cm. The first plate body 14 and the second plate body 15 are preferably made of a metal steel plate having a length of 14cm, a width of 6cm and a thickness of 0.7 cm. The first plate 14 is provided with two holes at its end for fixing the first contact structure 12, and the second plate 15 is provided with two holes at its end for fixing the second contact structure 13. The fixing plate 16 is preferably a metal fixing plate 16cm long by 4cm wide by 0.7cm thick, and two holes are provided on the end of the fixing plate 16 remote from the bracket 11, through which two bolts 71 pass to fix the fixing plate 16 to the frame.

As shown in fig. 1, 22 and 23, the fuse also includes a rain shield 60 disposed over the first contact structure 12, the rain shield 60 being disposed over the first contact structure 12 and the nut cover 34. The rain cover 60 is arranged to effectively prevent rain erosion, so as to prevent wind, sand and dust from blocking the contact point between the first contact structure 12 and the first plate 14, and prevent wind, sand and dust from blocking the contact point in the adjusting structure, so that the first conductive portion 32 is more firmly and durably contacted with the second conductive portion 122 and the third conductive portion 123, and has stronger conductivity. Rain shield 60 is preferably made of stainless steel and is formed by a forging process. The top of the rain shield 60 is made of aluminum with good conductivity. The nut cover 34 is universal and can be matched with all the fusible links with the same voltage class produced by different manufacturers.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.