CN114038723B

CN114038723B - Drop-out fuse

Info

Publication number: CN114038723B
Application number: CN202111319520.5A
Authority: CN
Inventors: 罗显泉
Original assignee: Guangdong Power Grid Co Ltd; Shaoguan Power Supply Bureau Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Shaoguan Power Supply Bureau Guangdong Power Grid Co Ltd
Priority date: 2021-11-09
Filing date: 2021-11-09
Publication date: 2023-06-20
Anticipated expiration: 2041-11-09
Also published as: CN114038723A

Abstract

The invention discloses a drop-out fuse, which comprises an insulating support, a first support arm, a second support arm, a fuse tube and a plurality of fuses, wherein the first support arm and the second support arm are respectively and fixedly arranged at two ends of the insulating support, the fuse tube comprises a tube body, a fixed contact, a moving contact and an elastic part, the fixed contact is fixedly connected with one end part of the tube body, the moving contact is hinged with the other end part of the tube body, the elastic part is arranged between the moving contact and the tube body, the fixed contact is hinged with the first support arm, the moving contact is detachably connected with the second support arm, the fuses are arranged in the tube body, one end part of each fuse is fixedly connected with the fixed contact, the first support arm, the second support arm, the fixed contact, the moving contact and the fuses can conduct electricity, a clamping block is arranged at the end part of the fuse far away from the fixed contact, the moving contact is provided with a clamping groove and a winding column, and the clamping block is detachably connected with the clamping groove. The drop-out fuse has the advantages of simple structure, low replacement and installation difficulty and high replacement efficiency.

Description

Drop-out fuse

Technical Field

The invention relates to the technical field of power distribution equipment, in particular to a drop-out fuse.

Background

In normal operation of the drop-out fuse of the prior art, the fuse tube is tensioned by the fuse wire to form a closed position. When the system fails, the fault current causes the fuse to be quickly blown out and form an electric arc, the arc-extinguishing tube is burnt by the electric arc, a large amount of gas is decomposed, high pressure is formed in the tube and flows strongly along the pipeline, and the electric arc is quickly lengthened and extinguished. After the fuse is melted, the lower static contact loses tension and turns down, so that the tightening mechanism releases the fuse tube, and the fuse tube falls to form an obvious breaking position.

When an electric accident occurs, the blown fuse wire needs to be removed from the fuse tube, a new fuse wire is replaced, the fuse wire is positioned and installed, and then the fuse wire is installed in a power distribution circuit, however, the number of the fuse wire tubes which need to be replaced on the whole power distribution system is large, and the installation difficulty of installing the new fuse wire in the fuse tube is large, so that the replacement efficiency is low.

Disclosure of Invention

The embodiment of the invention aims to provide a drop-out fuse which is low in replacement and installation difficulty and high in replacement efficiency.

To achieve the purpose, the embodiment of the invention adopts the following technical scheme:

the utility model provides a drop-out fuse, includes insulating support, first support arm, second support arm, fusion tube and many fuses, first support arm is fixed to be set up one of them tip of insulating support, the fixed setting of second support arm is in another tip of insulating support, the fusion tube includes pipe body, stationary contact, moving contact and elastic component, the stationary contact with one tip fixed connection of pipe body, the moving contact with another tip of pipe body articulates, the lateral wall of moving contact with be provided with between the pipe lateral wall of pipe body elastic component, the stationary contact with first support arm articulates, the moving contact with the second support arm can dismantle the connection, elastic component has always to order about the moving contact to one of them trend that the pipe lateral wall is close to, so that the moving contact breaks away from the second support arm drops, the fuse sets up in the pipe body, every the tip of fuse with the pipe body is close to the inner wall fixed connection of one end of stationary contact, first, second support arm, moving contact with the moving contact can be provided with the movable contact is kept away from to the movable contact, the movable contact is provided with the draw-in groove and can be dismantled the relative draw-in groove with the fuse, and the fuse has the reel to install the clamp.

As a preferable scheme of the drop-out fuse, the end face of the pipe body, which is far away from the fixed contact, is provided with a plurality of through holes in a penetrating way, each through hole can accommodate the fuse, the sectional area of the clamping block is larger than that of the through hole, and two end faces of the pipe body are provided with arc extinguishing holes.

As a preferable scheme of the drop-out fuse, a first elastic structure is arranged between two ends of the fuse, and the first elastic structure always has a trend of driving the fuse to be stretched.

As a preferable scheme of the drop-out fuse, the end face of the tube body, which is far away from the fixed contact, is further provided with a positioning block, the positioning block is provided with positioning holes in a penetrating manner, each positioning hole can accommodate the fuse, the positioning holes correspond to and are communicated with the through holes, and the width of the positioning block is smaller than that of the clamping block.

As a preferable scheme of the drop-out fuse, the clamping groove comprises a first mounting groove and a second mounting groove which are communicated, the groove width of the second mounting groove is larger than the width of the clamping block, the groove width of the first mounting groove is smaller than the width of the clamping block, and the groove width of the first mounting groove is larger than the diameter of the fuse.

As a preferable mode of the drop-out fuse, the winding posts are arranged at one side of the notch of the first mounting groove at intervals.

As a preferable scheme of the drop-out fuse, a second elastic structure and a pressing block are arranged on the second support arm, the upper end of the moving contact can be clamped with the pressing block, and the second elastic structure always has a trend of driving the pressing block to press the moving contact.

As a preferable scheme of the drop-out fuse, the pressing block is provided with a guide part and a clamping part, the guide part is arranged at one side far away from the insulating support, and the clamping part can be clamped with the moving contact.

As a preferable scheme of the drop-out fuse, the pressing block comprises a body and a limiting part which are vertically connected, wherein a right-angle notch-shaped clamping part is formed between the body and the limiting part; or alternatively, the first and second heat exchangers may be,

the briquetting is including body and the spacing portion that the interval set up, the body with second elastic structure is connected, the body supports tightly the upper end of moving contact, spacing portion is fixed on the second support arm, spacing portion supports the side of moving contact, just spacing portion is located the moving contact is close to one side of insulating support, spacing portion with form right angle breach form joint portion between the body.

As a preferable scheme of the drop-out fuse, the end part of the second support arm is provided with a clamping structure, the clamping structure comprises a first clamping part, a second clamping part and an elastic hinge part, the elastic hinge part is arranged between the first clamping part and the second clamping part, and the elastic hinge part always has a trend of driving the first clamping part to approach the second clamping part so as to clamp and fix the movable contact.

As a preferable scheme of the drop-out fuse, the periphery of the fuse wire is wrapped with an arc extinguishing tube, and both ends of the fuse wire pass through tube holes at the end parts of the arc extinguishing tube and are positioned outside the arc extinguishing tube.

As a preferable mode of the drop-out fuse, all the fuses are annularly arranged along the inner wall of the tube body; or alternatively, the first and second heat exchangers may be,

one end of each fuse wire is arranged on the end face of the pipe body, which is close to one end of the movable contact, at intervals, and the other end of each fuse wire is arranged on the end face of the pipe body, which is close to one end of the fixed contact, at intervals; or alternatively, the first and second heat exchangers may be,

all the fuses are gathered together near one end of the fixed contact, and the other end of the fuse is arranged on the end face of one end of the pipe body near the moving contact at intervals.

The embodiment of the invention has the beneficial effects that:

the drop-out fuse is formed by arranging an insulating support, a first support arm, a second support arm, a fusion tube and a plurality of fuses, wherein the first support arm is fixedly arranged at one end part of the insulating support, and the second support arm is fixedly arranged at the other end part of the insulating support. The fusion pipe comprises a pipe body, a fixed contact and a moving contact, wherein the fixed contact is fixedly connected with one end part of the pipe body, the moving contact is hinged with the other end part of the pipe body, an elastic part is arranged between the side wall of the moving contact and the side wall of the pipe body, the fixed contact is hinged with the first support arm, the moving contact is detachably connected with the second support arm, the positions of the fusion pipe and the insulating support can be limited, and the elastic part always has a trend of driving the moving contact to approach the outer side wall of the pipe body so that the moving contact breaks away from the second support arm and falls. The fuse wire is arranged in the pipe body, one end part of each fuse wire is fixedly connected with the fixed contact, the end part of each fuse wire, which is far away from the fixed contact, is provided with a clamping block, the moving contact is provided with a clamping groove and a winding column, the clamping block is detachably connected with the clamping groove, the fuse wire can be wound on the winding column, the fuse wire wound on the winding column can change the residual length of the fuse wire, and the tension of the fuse wire is regulated, so that the relative angle between the moving contact and the pipe body can be regulated by the tensioned fuse wire. The tension of the fuse after tightening and the elasticity of the elastic part are kept balanced, so that the length direction of the moving contact is kept parallel to the length direction of the pipe body, and after the moving contact is detachably connected with the second support arm, the fusion pipe can be fixed between the first support arm and the second support arm. Because the first support arm, the second support arm, the fixed contact, the moving contact and the fuse wire can conduct electricity, when the drop-out fuse of the embodiment of the invention suffers from overcurrent, the fuse wire is fused to cut off the electric connection, the fuse wire has no tension force, and at the moment, the side wall of the moving contact is driven to approach the outer side wall of the pipe body by the elastic part, so that the moving contact breaks away from the second support arm to drop, and the drop-out fuse can realize overcurrent protection on a distribution circuit. When the fuse needs to be replaced, the fusion tube is taken down from the first support arm, any fuse wire is wound on the winding column, the tension and the residual length of the fuse wire are adjusted, a clamping block at the end part of the fuse wire is clamped in a clamping groove of the moving contact, the angle position of the moving contact and the tube body is fixed, then the fixed contact is hinged with the first support arm, and the tube body is driven to rotate upwards until the moving contact is connected with the second support arm, so that the fusion tube can be fixedly installed between the first support arm and the second support arm again. Therefore, the drop-out fuse provided by the embodiment of the invention can reduce the replacement and installation difficulty of the fuse and improve the replacement efficiency of the fuse.

Drawings

The invention is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic front view of a drop-out fuse according to a first embodiment of the present invention.

Fig. 2 is a schematic side view of a drop-out fuse according to a first embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a partial structure at a in the embodiment of fig. 1 according to the present invention.

Fig. 4 is a schematic front view of a drop-out fuse according to a second embodiment of the present invention.

Fig. 5 is an enlarged schematic view of a partial structure at B in the embodiment of fig. 4 according to the present invention.

Fig. 6 is a schematic front view of a drop-out fuse according to a third embodiment of the present invention.

Fig. 7 is an enlarged schematic view of a partial structure at C in the embodiment of fig. 6 according to the present invention.

In the figure:

1. an insulating support; 11. a fixing seat;

2. a first arm; 21. a groove;

3. a second arm; 31. a clamping structure; 311. a first clamping part; 312. a second clamping portion; 313. an elastic hinge part; 32. a guide rod; 33. unlocking the rod;

4. a fusion pipe; 41. a tube body; 411. a through hole; 412. a positioning block; 413. the outer side wall of the tube; 42. a stationary contact; 43. a moving contact; 431. a clamping groove; 4311. a first mounting groove; 4312. a second mounting groove; 432. winding a column; 44. an elastic part; 45. a rotating rod;

5. a fuse; 51. a first elastic structure; 52. arc extinguishing pipe; 6. a clamping block; 7. a second elastic structure; 8. briquetting; 81. a guide part; 82. a clamping part; 83. a body; 84. and a limiting part.

Detailed Description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1, an embodiment of the present invention provides a drop-out fuse, including an insulating support 1, a first support arm 2, a second support arm 3, a fuse tube 4 and a plurality of fuses 5, where the first support arm 2 is fixedly disposed at one end of the insulating support 1, the second support arm 3 is fixedly disposed at the other end of the insulating support 1, the fuse tube 4 includes a tube body 41, a fixed contact 42, a movable contact 43 and an elastic portion 44, the fixed contact 42 is fixedly connected with one end of the tube body 41, the movable contact 43 is hinged with the other end of the tube body 41, an elastic portion 44 is disposed between a side wall of the movable contact 43 and a tube outer side wall 413 of the tube body 41, the fixed contact 42 is hinged with the first support arm 2, the movable contact 43 is detachably connected with the second support arm 3, the elastic portion 44 always has a trend of driving the movable contact 43 to approach the tube outer side wall 413 of the tube body 41, so that the movable contact 43 is separated from the second support arm 3 and drops, the fuses 5 are disposed in the tube body 41, one end of each fuse 5 is fixedly connected with an inner wall of the tube body 41 near the fixed contact 42, the movable contact 43 is movably connected with the movable contact 431, and the movable contact 431 is capable of being wound around the movable contact 43 and the movable contact 43, and the movable contact 43 is capable of being wound around the movable contact 43, and the movable contact 43 is capable of being wound around the movable contact 5, and the movable contact 43 is capable of being wound around the movable contact 6, and the movable contact 3, and the movable contact 43 is capable of a movable contact 43.

The embodiment of the invention forms the drop-out fuse by arranging the insulating support 1, the first support arm 2, the second support arm 3, the fusion tube 4 and the plurality of fuses 5, wherein the first support arm 2 is fixedly arranged at one end part of the insulating support 1, and the second support arm 3 is fixedly arranged at the other end part of the insulating support 1. The fusion pipe 4 comprises a pipe body 41, a fixed contact 42, a moving contact 43 and an elastic part 44, wherein the fixed contact 42 is fixedly connected with one end part of the pipe body 41, the moving contact 43 is hinged with the other end part of the pipe body 41, the elastic part 44 is arranged between the side wall of the moving contact 43 and the pipe outer side wall 413 of the pipe body 41, the elastic part 44 always has a trend of driving the moving contact 43 to approach the pipe outer side wall 413 of the pipe body 41, the fixed contact 42 is hinged with the first support arm 2, the moving contact 43 is detachably connected with the second support arm 3, and the positions of the fusion pipe 4 and the insulating support 1 can be limited. The fuse wires 5 are arranged in the tube body 41, one end part of each fuse wire 5 is fixedly connected with the inner side wall of the tube body 41, a clamping block 6 is arranged at the end part of the fuse wire 5, which is far away from the fixed contact 42, the moving contact 43 is provided with a clamping groove 431 and a winding column 432, the clamping block 6 is detachably connected with the clamping groove 431, the fuse wires 5 can be wound on the winding column 432, the residual length of the fuse wires 5 can be changed by the fuse wires 5 wound on the winding column 432, and the tension force of the fuse wires 5 is adjusted, so that the relative angle between the moving contact 43 and the tube body 41 can be adjusted by the tensioned fuse wires 5.

The tension of the fuse 5 and the elastic force of the elastic portion 44 are balanced after tightening, so that the length direction of the moving contact 43 is kept parallel to the length direction of the pipe body 41, and the melting pipe 4 can be fixed between the first arm 2 and the second arm 3 after the moving contact 43 is detachably connected with the second arm 3. Because the first support arm 2, the second support arm 3, the fixed contact 42, the moving contact 43 and the fuse 5 can conduct electricity, when the drop-out fuse of the embodiment of the invention suffers from overcurrent, the fuse 5 is fused to cut off the electrical connection, the fuse 5 has no tension force, and at the moment, the elastic part 44 drives the side wall of the moving contact 43 to approach the outer side wall 413 of the pipe body 41, so that the moving contact 43 is separated from the second support arm 3 to drop, and the drop-out fuse realizes overcurrent protection on a distribution circuit.

When the fuse 5 needs to be replaced, the fuse tube 4 is taken down from the first support arm 2, any fuse 5 is wound on the winding post 432, the tension and the residual length of the fuse 5 are adjusted, the clamping block 6 at the end part of the fuse 5 is clamped in the clamping groove 431 of the moving contact 43, the angle position of the moving contact 43 and the tube body 41 is fixed, the fixed contact 42 is hinged with the first support arm 2, the tube body 41 is driven to rotate upwards until the moving contact 43 is connected with the second support arm 3, and the fuse tube 4 can be fixedly installed between the first support arm 2 and the second support arm 3 again. Therefore, the drop-out fuse provided by the embodiment of the invention can reduce the replacement and installation difficulty of the fuse 5 and improve the replacement efficiency of the fuse 5.

In one embodiment, referring to fig. 2, the end surface of the tube body 41 away from the stationary contact 42 is provided with a plurality of through holes 411 therethrough, each through hole 411 is capable of accommodating the fuse 5, the cross-sectional area of the clip 6 is larger than that of the through hole 411, and the two end surfaces of the tube body 41 are provided with arc extinguishing holes. Blocking the latch 6 outside the tube body 41 through the through hole 411, to prevent the fuse 5 and the latch 6 from falling into the tube body 41; through setting up the arc extinguishing hole, the electric arc that produces after fuse 5 fuses passes through arc extinguishing Kong Miehu, guarantees that other fuses 5 are not influenced.

Preferably, the arc extinguishing holes are arranged on one side of the through holes 411, the number of the arc extinguishing holes is equal to that of the through holes 411, and the arc extinguishing holes are in one-to-one correspondence with the positions of the through holes 411.

Further, with continued reference to fig. 1, a first elastic structure 51 is disposed between two ends of the fuse 5, and the first elastic structure 51 always has a tendency to drive the fuse 5 to tighten, so that each fuse 5 in the tube body 41 is disposed at intervals due to tightening, and other unused fuses 5 are prevented from being blown due to contact of the fuses 5.

Preferably, the first elastic structure 51 is formed by spirally winding a partial section of the fuse 5.

Still further, with continued reference to fig. 1, the end surface of the tube body 41 far from the fixed contact 42 is further provided with a positioning block 412, the positioning block 412 is provided with positioning holes in a penetrating manner, each positioning hole can accommodate the fuse 5, and the positioning holes are arranged corresponding to the through holes 411, so that the fuse 5 can penetrate through the positioning holes and extend out of the tube body 41. Moreover, when the fuse 5 is retracted and tightened by the first elastic structure 51, the clamping block 6 can be abutted on the positioning block 412, and because the width of the positioning block 412 is smaller than that of the clamping block 6, a gap exists between the clamping block 6 and the pipe body 41, so that the clamping block 6 can be conveniently taken out.

In another embodiment, referring to fig. 3, the clamping groove 431 is a stepped groove, the clamping groove 431 includes a first mounting groove 4311 and a second mounting groove 4312, the groove width of the second mounting groove 4312 is greater than or equal to the width of the clamping block 6, the clamping block 6 can move along the groove wall of the second mounting groove 4312, and the clamping block 6 can be accommodated by using the second mounting groove 4312. The width of the first mounting groove 4311 is smaller than the width of the clamping block 6, the width of the first mounting groove 4311 is larger than the diameter of the fuse 5, the first mounting groove 4311 is used for accommodating the fuse 5 and blocking the clamping block 6 in the second mounting groove 4312 from separating from the second mounting groove 4312, the clamping block 6 is moved along the groove wall of the second mounting groove 4312 until the clamping block 6 is separated from the second mounting groove 4312, the effect of disassembling the clamping block 6 on the clamping groove 431 can be achieved, and the detachable connection between the clamping groove 431 and the clamping block 6 is realized. Specifically, the first mounting groove 4311 and the second mounting groove 4312 each communicate with the outside along one end of the movement direction of the latch 6 (the direction of this movement being parallel to the groove bottom of the second mounting groove 4312 as shown in fig. 3) to form an opening from which the latch 6 slides into the second mounting groove 4312, and the latch 6 is restricted from being separated from the movable contact 43 by the first mounting groove 4311.

Preferably, with continued reference to fig. 3, the winding posts 432 are disposed at a side of the notch of the first mounting groove 4311 at intervals, and the winding posts 432 are disposed in the direction of the first mounting groove 4311 so as to reduce contact between the fuse 5 and the first mounting groove 4311, thereby reducing the risk of the fuse 5 being scratched by the first mounting groove 4311.

In addition, referring to fig. 1 and 3, the end of the second arm 3 is provided with a clamping structure 31, the clamping structure 31 includes a first clamping portion 311, a second clamping portion 312, and an elastic hinge portion 313, the elastic hinge portion 313 is disposed between the first clamping portion 311 and the second clamping portion 312, and the elastic hinge portion 313 always has a tendency to urge the first clamping portion 311 toward the second clamping portion 312 so as to clamp the fixed moving contact 43. When the moving contact 43 needs to be fixed, the first clamping portion 311 is driven to be away from the second clamping portion 312, the moving contact 43 can be placed between the first clamping portion 311 and the second clamping portion 312, and the first clamping portion 311 approaches the second clamping portion 312 to clamp the moving contact 43 by virtue of the elastic force of the elastic hinge portion 313, so that the moving contact 43 can be fixed. Or, when the moving contact 43 needs to be released, the first clamping portion 311 is also driven to be away from the second clamping portion 312, so that the clamping of the moving contact 43 by the first clamping portion 311 and the second clamping portion 312 is released, and the moving contact 43 can be easily pulled out from the first clamping portion 311 and the second clamping portion 312. Therefore, the clamping structure 31 is simple and convenient to clamp the movable contact 43, and the clamping effect is good.

In order to facilitate the separation of the first clamping portion 311 from the second clamping portion 312, the unlocking lever 33 is disposed on the second clamping portion 312, and when in operation, the unlocking lever 33 is pulled to drive the second clamping portion 312 to separate from the first clamping portion 311 by overcoming the elastic force of the elastic hinge portion 313.

In other embodiments, the clamping structure 31 is not limited to be provided, and other structures may be used to fix the moving contact 43, as shown in fig. 4 and 5, the second arm 3 is provided with a second elastic structure 7 and a pressing block 8, the upper end of the moving contact 43 can be clamped with the pressing block 8, and the second elastic structure 7 always has a tendency to drive the pressing block 8 to press the moving contact 43. The second elastic structure 7 can press the pressing block 8 against the moving contact 43, so that the end of the moving contact 43 can keep a relatively fixed state with the second support arm 3 under the tension state of the fuse wire 5, when the drop-out fuse of the embodiment of the invention suffers overcurrent, the fuse wire 5 is fused to cut off the electric connection, the fuse wire 5 has no tension force, at the moment, the elastic part 44 drives the side wall of the moving contact 43 to approach the outer side wall 413 of the pipe body 41, the pressing block 8 is separated from the moving contact 43, the moving contact 43 is separated from the second support arm 3 to drop, and the drop-out fuse achieves overcurrent protection on a distribution circuit.

The pressing block 8 is provided with a guiding portion 81 and a clamping portion 82, the guiding portion 81 is arranged on one side away from the insulating support 1, and the clamping portion 82 can be clamped with the moving contact 43. The guiding portion 81 is used for guiding the moving contact 43 to be clamped with the clamping portion 82 of the pressing block 8, so that the connection efficiency of the moving contact 43 and the second support arm 3 is further improved, and the connection difficulty is reduced.

In this embodiment, the pressing block 8 includes a body 83 and a limiting portion 84 that are vertically connected, and a right-angle notch-shaped clamping portion 82 is formed between the body 83 and the limiting portion 84. The right-angle notch-shaped clamping part 82 is not only convenient for clamping the moving contact 43, but also convenient for separating the moving contact 43 from the pressing block 8 after the fuse 5 is broken.

The guiding portion 81 is disposed at one end of the body 83 away from the limiting portion 84, and is used for guiding the moving contact 43 to move into the clamping portion 82. Preferably, the guide portion 81 is a circular arc portion.

As shown in fig. 6 and 7, this embodiment is similar to the embodiment shown in fig. 4 and 5, and differs from the embodiment in that the structure of the pressing block 8 only in that in this embodiment, the pressing block 8 adopts a split structure, that is, the pressing block 8 includes a body 83 and a limiting portion 84 that are disposed at intervals, the body 83 is connected with the second elastic structure 7, the body 83 abuts against the upper end of the moving contact 43, the limiting portion 84 is fixed on the second support arm 3, the limiting portion 84 abuts against a side edge of the moving contact 43, and the limiting portion 84 is located on a side, close to the insulating support 1, of the moving contact 43, and a right-angle notch-shaped clamping portion 82 is formed between the limiting portion 84 and the body 83. By arranging the limiting part 84 on the second support arm 3, the limiting part 84 is spaced from the body 83, so that the body 83 only needs to press the moving contact 43, and the impact force from the moving contact 43 turning to the press block 8 directly acts on the limiting part 84, so that the second support arm 3 can be utilized to increase the stress of the limiting part 84.

Preferably, the end of the moving contact 43 is arc-shaped, and the shape of the clamping part 82 corresponding to the clamping of the moving contact 43 on the pressing block 8 is matched with the shape of the end surface of the moving contact 43, so that the moving contact 43 and the second support arm 3 are in good contact, the electric conduction is smooth, and the moving contact 43 can be clamped on the pressing block 8 more smoothly.

Alternatively, referring to fig. 2, the fuse 5 is wrapped with an arc extinguishing tube 52, and both ends of the fuse 5 are located outside the arc extinguishing tube 52 through tube holes at the ends of the arc extinguishing tube 52. The arc generated after the fuse 5 is blown out is extinguished through the arc extinguishing tube 52, and the arc extinguishing tube 52 can isolate heat outside each fuse 5, so that the unused fuse 5 is prevented from being heated wrongly and blown out.

In particular, referring to fig. 1 and 2, the second support arm 3 is further provided with guide rods 32 in an extending manner, the guide rods 32 are disposed on two sides of the melting tube 4, and when the falling melting tube 4 is turned upwards, the melting tube 4 can be guided to the position below the second support arm 3 through guiding and limiting of the guide rods 32, so that the second support arm 3 is convenient to be connected with the moving contact 43.

In a preferred embodiment, referring to fig. 1, the first arm 2 is provided with a groove 21, the notch of the groove 21 faces the insulating support 1, the fixed contact 42 is provided with a rotating rod 45, the groove 21 can accommodate the rotating rod 45, the rotating rod 45 is rotatably arranged in the groove 21, and the fixed contact 42 is conveniently separated from the first arm 2 while the fixed contact 42 is hinged with the first arm 2. When the fuse 5 in the tube body 41 is completely broken, the rotating rod 45 can be separated from the groove 21, so that the purpose of detaching the fusion tube 4 from the first support arm 2 is achieved.

In particular, with reference to fig. 1, the insulating support 1 is provided, on the side facing away from the fusion pipe 4, with a fixing seat 11, said fixing seat 11 being used for fixedly connecting the insulating support 1 with an external connection, such as a support for a distribution line, or an electric pole.

All the fuses 5 are annularly arranged along the inner wall of the tube body 41. In other embodiments, all the ends of the fuses 5 near the fixed contact 42 are gathered together, and the other ends are disposed at intervals on the end face of the tube body 41 near the end of the movable contact 43. The design can reduce the fixed point of the fuse 5 near one end of the fixed contact 42, and reduce the fixed difficulty. Alternatively, one ends of all the fuses 5 are disposed at intervals on the end face of the tube body 41 near one end of the moving contact 43, and the other ends of all the fuses 5 are disposed at intervals on the end face of the tube body 41 near one end of the fixed contact 42. The design can make the fuses 5 not contact, reduce the influence of the fuses 5, and even if one fuse 5 breaks, the other fuses 5 are not influenced.

In the description herein, it should be understood that the terms "upper," "lower," "right," and the like are used for convenience in description and simplicity of operation only, and are not to be construed as limiting the invention, as the devices or elements referred to must have, be constructed or operated in a particular orientation. Furthermore, the terms "first," second, "and third," are used merely for distinguishing between descriptions and not for providing a special meaning.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in the foregoing embodiments, and that the embodiments described in the foregoing embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The technical principle of the present invention is described above in connection with the specific embodiments. The description is made for the purpose of illustrating the general principles of the invention and should not be taken in any way as limiting the scope of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of this specification without undue burden.

Claims

1. The drop-out fuse is characterized by comprising an insulating support (1), a first support arm (2), a second support arm (3), a fusion tube (4) and a plurality of fuses (5), wherein the first support arm (2) is fixedly arranged at one end part of the insulating support (1), the second support arm (3) is fixedly arranged at the other end part of the insulating support (1), the fusion tube (4) comprises a tube body (41), a fixed contact (42), a moving contact (43) and an elastic part (44), the fixed contact (42) is fixedly connected with one end part of the tube body (41), the moving contact (43) is hinged with the other end part of the tube body (41), the elastic part (44) is arranged between the side wall of the moving contact (43) and the outer side wall (413) of the tube body (41), the fixed contact (42) is hinged with the first support arm (2), the moving contact (43) is detachably connected with the second support arm (3), the elastic part (44) is always provided with the moving contact (43) which is in a trend of falling-off direction to the moving contact (43) to be close to the outer side wall (41), every fuse (5) one of them tip with pipe body (41) is close to the inner wall fixed connection of static contact (42) one end, first support arm (2) second support arm (3) static contact (42) moving contact (43) with fuse (5) can electrically conduct, fuse (5) keep away from the tip of static contact (42) is provided with fixture block (6), moving contact (43) are provided with draw-in groove (431) and around post (432), fixture block (6) with draw-in groove (431) are dismantled and are connected, fuse (5) can wind and set up around post (432) on, so that after the tensioning fuse (5) can be adjusted moving contact (43) with the relative angle of pipe body (41).

2. The drop-out fuse according to claim 1, wherein the end face of the tube body (41) away from the stationary contact (42) is provided with a plurality of through holes (411) penetrating therethrough, each through hole (411) is capable of accommodating the fuse wire (5), the cross-sectional area of the clip block (6) is larger than the cross-sectional area of the through hole (411), and the two end faces of the tube body (41) are provided with arc extinguishing holes.

3. A drop-out fuse according to claim 2, characterized in that the fuse wire (5) is provided with a first elastic structure (51), which first elastic structure (51) always has a tendency to drive the fuse wire (5) taut.

4. The drop-out fuse of claim 2, wherein the end face of the tube body (41) away from the stationary contact (42) is further provided with a positioning block (412), the positioning block (412) is provided with positioning holes therethrough, each positioning hole is capable of accommodating the fuse wire (5), the positioning holes correspond to and communicate with the through holes (411), and the width of the positioning block (412) is smaller than the width of the clamping block (6).

5. The drop-out fuse of claim 1, wherein the clamping groove (431) is a stepped groove, the clamping groove (431) includes a first mounting groove (4311) and a second mounting groove (4312) that are communicated, a groove width of the second mounting groove (4312) is larger than a width of the clamping block (6), a groove width of the first mounting groove (4311) is smaller than a width of the clamping block (6), and a groove width of the first mounting groove (4311) is larger than a diameter of the fuse (5).

6. The drop-out fuse of claim 5, wherein the winding posts (432) are disposed at intervals on one side of the notch of the first mounting groove (4311).

7. The drop-out fuse of claim 1, wherein a second elastic structure (7) and a pressing block (8) are arranged on the second support arm (3), the upper end of the moving contact (43) can be clamped with the pressing block (8), and the second elastic structure (7) always has a tendency of driving the pressing block (8) to press the moving contact (43).

8. The drop-out fuse of claim 7, wherein the pressure block (8) is provided with a guide portion (81) and a clamping portion (82), the guide portion (81) is provided on a side away from the insulating holder (1), and the clamping portion (82) is capable of being clamped with the moving contact (43).

9. The drop-out fuse of claim 8, wherein the pressure block (8) includes a body (83) and a limiting portion (84) that are vertically connected, the clamping portion (82) having a right angle notch shape being formed between the body (83) and the limiting portion (84); or alternatively, the first and second heat exchangers may be,

the briquetting (8) is including body (83) and spacing portion (84) that the interval set up, body (83) with second elastic structure (7) are connected, body (83) support tightly the upper end of moving contact (43), spacing portion (84) are fixed on second support arm (3), spacing portion (84) support the side of moving contact (43), just spacing portion (84) are located moving contact (43) are close to one side of insulating support (1), spacing portion (84) with form between body (83) joint portion (82).

10. The drop-out fuse of claim 1, wherein the end of the second arm (3) is provided with a clamping structure (31), the clamping structure (31) comprises a first clamping portion (311), a second clamping portion (312) and an elastic hinge portion (313), the elastic hinge portion (313) is arranged between the first clamping portion (311) and the second clamping portion (312), and the elastic hinge portion (313) always has a trend of driving the first clamping portion (311) to approach the second clamping portion (312) so as to clamp and fix the moving contact (43).

11. The drop-out fuse of claim 1, wherein the fuse wire (5) is wrapped with an arc extinguishing tube (52), and both ends of the fuse wire (5) are located outside the arc extinguishing tube (52) through tube holes at the ends of the arc extinguishing tube (52).

12. The drop-out fuse of claim 1, wherein all of the fuses (5) are annularly arranged along an inner wall of the tube body (41); or alternatively, the first and second heat exchangers may be,

one end of all the fuses (5) is arranged on the end face of the pipe body (41) close to one end of the moving contact (43) at intervals, and the other end of all the fuses (5) is arranged on the end face of the pipe body (41) close to one end of the fixed contact (42) at intervals; or alternatively, the first and second heat exchangers may be,

all the fuse wires (5) are gathered together near one end of the fixed contact (42), and the other end is arranged at intervals on the end face of one end of the pipe body (41) near the movable contact (43).