CN114038720A

CN114038720A - Drop-out fuse

Info

Publication number: CN114038720A
Application number: CN202111318490.6A
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: 2022-02-11
Anticipated expiration: 2041-11-09
Also published as: CN114038720B

Abstract

The invention discloses a drop-out fuse which comprises an insulating support, a first support arm, a second support arm, a plurality of fuse tubes and a plurality of fuses, wherein the first support arm and the second support arm are respectively and fixedly arranged at two end parts of the insulating support, all the fuse tubes comprise tube bodies, the tube bodies comprise fixed contacts and moving contacts which are oppositely arranged, all the fixed contacts are fixedly connected with a connecting plate, the connecting plate is connected with a conductor, the conductor is hinged with the first support arm, each tube body is internally provided with the fuse wire in a tightening manner, the moving contacts penetrate through first through holes, one ends of the fuse wires penetrating through the first through holes are also fixedly provided with clamping blocks, the clamping blocks are arranged at one sides of the through holes far away from the fixed contacts, the end parts of the second support arm are provided with elastic structures and pressing blocks, the clamping blocks can be clamped with the pressing blocks, and the second support arm, the elastic structures, the pressing blocks, the clamping blocks, the fuse wires, the conductors and the first support arm can be conductive. The drop-out fuse is low in replacement difficulty and high in 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

The drop-out fuse is generally arranged in a distribution line at a high position, and when the drop-out fuse operates normally, the fuse tube forms a closed position after being tensioned by a fuse wire. When a system fails, the fault current causes the fuse to blow quickly. After the fuse is fused, the lower static contact loses tension and turns downwards, so that the tightening mechanism releases the fuse tube, and the fuse tube falls to form an obvious cut-off position.

However, only one fuse wire is tightened in each fuse wire tube, and when the fuse wire needs to be replaced, the fuse wire tube arranged at a high position needs to be taken down by using the insulating rod, and the fuse wire tube is installed back on the insulating support after the fuse wire in the fuse wire tube is replaced. That is to say, when the fuse tube of changing is more, drop out fuse has the change degree of difficulty big, the problem of change inefficiency.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a drop-out fuse, which is low in replacement difficulty and high in replacement efficiency.

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

the drop-out fuse comprises an insulating support, a first support arm, a second support arm, a plurality of fuse tubes and a plurality of fuses, wherein the first support arm and the second support arm are respectively and fixedly arranged at two end parts of the insulating support, each fuse tube comprises a tube body, the tube body comprises a fixed contact and a movable contact which are oppositely arranged, all the fixed contacts are connected with a connecting plate, one side of the connecting plate, far away from the tube body, is provided with a conductor, one end of the conductor, far away from the connecting plate, is hinged with the first support arm, the fuse wire is tightly arranged in each tube body, the movable contact penetrates through a first through hole, one end of the fuse wire, far away from the fixed contact, penetrates through the first through hole and is fixedly provided with a fixture block, the fixture block is tightly pressed on one side of the first through hole, far away from the fixed contact, the end part of the second support arm is provided with an elastic structure and a pressing block, the fixture block can with the briquetting joint, elastic structure has all the time and orders about the briquetting compresses tightly the trend of fixture block, the second support arm the elastic structure the briquetting the fixture block the fuse the conductor with first support arm all can be electrically conductive.

As a preferable scheme of the drop-out fuse, all the fixed contacts are detachably connected with the connecting plate.

As a preferred scheme of the drop-out fuse, the connecting plate is fixedly provided with a base, and the fixed contact of the tube body is clamped and/or screwed into the base, so that the tube body and the connecting plate are relatively fixed in position.

As a preferred embodiment of the drop-out fuse, the connecting plate and the base are electrically conductive, and the fuse is electrically conducted to the conductor through the connecting plate and the base; or the like, or, alternatively,

the connecting plate or the base is made of insulating materials, a second through hole is formed in the connecting plate or the base corresponding to each fuse wire, and the fuse wires penetrate through the second through holes to be connected with the conductor so as to realize electric conduction of the fuse wires and the conductor.

As a preferable mode of the drop-out fuse, a plurality of the fusion tubes are arranged in a straight line.

As a preferable mode of the drop-out fuse, all the fusion tubes are fixed together.

As a preferred scheme of the drop-out fuse, all the fusion tubes are fixedly connected through tube clamps, each tube clamp comprises a first clamping plate and a second clamping plate which are detachably arranged, and the fusion tubes are clamped between the first clamping plates and the second clamping plates.

As a preferable scheme of the drop-out fuse, the number of the pipe clamps is at least two, the two pipe clamps clamp all the fusion tubes, and the pipe clamps are arranged at intervals along the length direction of the fusion tubes.

As a preferred scheme of the drop-out fuse, a positioning block is further arranged on the end face of the movable contact of the tube body, positioning holes penetrate through the positioning block, each positioning hole can accommodate the fuse wire, the positioning holes correspond to and are communicated with the first through holes, and the width of each positioning block is smaller than that of each clamping block.

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

As a preferred scheme of the drop-out fuse, the pressing block comprises a body and a limiting part which are vertically connected, and a right-angle notch-shaped clamping part is formed between the body and the limiting part; or the like, or, alternatively,

the pressing block comprises a body and a limiting part, the body and the elastic structure are connected, the body is abutted against the upper end of the clamping block, the limiting part is fixed on the second support arm, the limiting part is abutted against the side edge of the clamping block, the limiting part is located on one side, close to the insulating support, of the clamping block, and the clamping part is formed between the body and the limiting part.

As a preferred scheme of the drop-out fuse, the guiding portion is disposed at an end of the body away from the limiting portion, and is used for guiding the fixture block to move into the clamping portion.

As a preferred scheme of the drop-out fuse, the moving contact is provided with arc extinguishing holes in a penetrating manner, and the arc extinguishing holes are arranged on one side of the first through hole at intervals; or the like, or, alternatively,

the fixture block only covers part of the position of the first through hole.

As a preferable scheme of the drop-out fuse, contact surfaces between the fixture block and the clamping portion are mutually matched, and the contact surfaces between the fixture block and the clamping portion are arc-shaped.

As a preferred scheme of the drop-out fuse, the fixture block comprises a main body clamped with the pressing block, the main body is at least provided with two abutting parts extending towards the fusion tube, the two abutting parts are clamped at the end part of the fusion tube, part of the fixture block is suspended at one side of the fusion tube close to the insulating support, and the suspended part of the fixture block is clamped with the pressing block;

or, the fixture block include with the main part of briquetting joint, the main part is close to one side of fusion tube is provided with the round portion of cup jointing, the cover of cup jointing portion is established the tip of fusion tube, the fixture block part is unsettled the fusion tube is close to one side of insulating support, just the unsettled part that sets up of fixture block with the briquetting joint.

As a preferred scheme of the drop-out fuse, an arc transition structure or a right-angle transition structure is arranged between one side of the moving contact, which is far away from the pressing block, and the outer side wall of the tube body; or an arc transition structure or a right-angle transition structure is arranged between one side of the moving contact close to the pressing block and the outer side wall of the pipe body.

As a preferred scheme of the drop-out fuse, the fixture block partially abuts against the end face of the movable contact, and is partially suspended on one side of the fusion tube close to the insulating support, and the suspended part of the fixture block is clamped with the pressing block; or the like, or, alternatively,

the end face of the moving contact is convexly provided with a limiting convex block, one side of the fixture block, which is far away from the insulating support, is abutted against the limiting convex block, part of the fixture block is abutted against the end face of the moving contact, part of the fixture block is suspended on one side, which is close to the insulating support, of the fusion tube, and the suspended part of the fixture block is clamped with the pressing block.

The embodiment of the invention has the beneficial effects that:

form drop out fuse through setting up insulating support, first support arm, second support arm, many fusion tubes and many fuses, wherein, first support arm and second support arm are fixed respectively and are set up two tip at insulating support, and every fusion tube all includes a pipe body, and the pipe body is including the static contact and the moving contact of relative setting, all static contacts and connecting plate fixed connection, and the connecting plate is connected with the conductor, and the conductor is articulated with first support arm, can articulate many fusion tubes on first support arm. Each tube body is internally provided with a fuse wire in a tightening manner, the moving contact penetrates through a first through hole, one end of each fuse wire penetrates through the first through hole and is fixedly provided with a fixture block, the fixture block is arranged on one side of the first through hole, which is far away from the fixed contact, the fuse wire can be kept in a tightening state, and the fixture block is prevented from being separated from the moving contact. Moreover, the tip of second support arm is provided with elastic construction and briquetting, and the fixture block can with the briquetting joint, and elastic construction has the trend of ordering about the briquetting and compressing tightly the fixture block all the time, is close to until the fixture block butt briquetting at the moving contact to the second support arm, and under elastic construction's elasticity drive, fixture block and briquetting can keep the joint state. In addition, the second support arm, the elastic structure, the pressing block, the clamping block, the fuse wire, the conductor and the first support arm can be conductive, when overcurrent current is introduced into the drop-out fuse disclosed by the embodiment of the invention, the fuse wire is fused, the clamping block loses the tension force of the fuse wire and falls off from the movable contact of the tube body, so that the fuse tube after the fuse wire is fused falls off under the action of gravity, the electric connection between the first support arm and the second support arm is cut off, and the effect of breaking a circuit is achieved. When the circuit needs to be switched on again, the fuse tube does not need to be taken down from the power distribution system and then the fuse wire is installed, a plurality of the falling fuse tubes are directly overturned upwards until the clamping block of the next fuse tube is abutted to the pressing block, and the effects of quickly replacing the fuse wire and switching on the circuit are achieved. Therefore, the drop-out fuse disclosed by the embodiment of the invention is low in fuse wire replacement difficulty and high in replacement efficiency. In addition, the conductor and the connecting plate are adopted to fix the static contacts of the plurality of fusion tubes, the length of a single fusion tube can be shortened, and the manufacturing cost of the whole drop-out fuse is further reduced.

Drawings

The invention is explained in more detail below with reference to the figures and examples.

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

FIG. 2 is an enlarged view of a portion of the embodiment A of FIG. 1.

Fig. 3 is a schematic partial structure diagram of a drop-out fuse according to a second embodiment of the present invention.

Fig. 4 is a schematic partial structure diagram of a drop-out fuse according to a third embodiment of the present invention.

Fig. 5 is a schematic partial structure diagram of a drop-out fuse according to a fourth embodiment of the present invention.

Fig. 6 is a schematic partial structure diagram of a drop-out fuse according to a fifth embodiment of the present invention.

In the figure:

1. an insulating support; 2. a first support arm; 21. a groove; 3. a second support arm; 31. an elastic structure; 32. briquetting; 321. a guide part; 322. a clamping part; 323. a body; 324. a limiting part; 4. a fusion tube; 41. a tube body; 411. static contact; 412. a moving contact; 413. a first through hole; 414. a limiting bump; 5. a conductor; 51. a first guide bar; 52. a second guide bar; 6. positioning blocks; 7. a pipe clamp; 8. a fuse; 9. a clamping block; 91. a main body; 92. an abutting portion; 93. a circular arc transition structure; 94. a right angle transition structure; 10. a connecting plate; 11. a base.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, 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 a part of the embodiments of the present invention, and not all embodiments. 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.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation 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 plurality of fuse tubes 4, and a plurality of fuses 8, where the first support arm 2 and the second support arm 3 are respectively and fixedly disposed at two ends of the insulating support 1, each fuse tube 4 includes a tube body 41, the tube body 41 includes a fixed contact 411 and a movable contact 412 that are disposed oppositely, all the fixed contacts 411 are connected to a connecting plate 10, a conductor 5 is disposed on a side of the connecting plate 10 away from the tube body 41, one end of the conductor 5 away from the connecting plate 10 is hinged to the first support arm 2, the fuse 8 is tightly stretched in each tube body 41, the movable contact 412 is provided with a first through hole 413 through which the fixed contact 411 is penetrated, and a fixture block 9 is fixedly disposed on one end of the fuse 8 away from the first through hole 413, the fixture block 9 abuts against one side of the first through hole 413, which is far away from the fixed contact 411, an elastic structure 31 and a pressing block 32 are arranged at an end portion of the second support arm 3, the fixture block 9 can be clamped with the pressing block 32, the elastic structure 31 always has a tendency of driving the pressing block 32 to press the fixture block 9, and the second support arm 3, the elastic structure 31, the pressing block 32, the fixture block 9, the fuse 8, the conductor 5 and the first support arm 2 can all conduct electricity.

In the embodiment of the invention, the insulating support 1, the first support arm 2, the second support arm 3, the plurality of fusion tubes 4 and the plurality of fuses 8 are arranged to form the drop-out fuse, wherein the first support arm 2 and the second support arm 3 are respectively and fixedly arranged at two end parts of the insulating support 1, each fusion tube 4 comprises a tube body 41, each tube body 41 comprises a fixed contact 411 and a movable contact 412 which are oppositely arranged, all the fixed contacts 411 are fixedly connected with the connecting plate 10, the connecting plate 10 is connected with the conductor 5, and the conductor 5 is hinged with the first support arm 2, so that the plurality of fusion tubes 4 can be hinged on the first support arm 2. Each tube body 41 is internally provided with a fuse wire 8 in a tensioned manner, the movable contact 412 is provided with a first through hole 413 in a penetrating manner, one end of the fuse wire 8 penetrates through the first through hole 413 and is fixedly provided with a fixture block 9, the fixture block 9 is arranged on one side of the first through hole 413 far away from the fixed contact 411, the fuse wire 8 can be kept in a tensioned state, and the fixture block 9 is prevented from being separated from the movable contact 412. Moreover, the end of the second arm 3 is provided with the elastic structure 31 and the pressing block 32, the clamping block 9 can be clamped with the pressing block 32, the elastic structure 31 always has a tendency of driving the pressing block 32 to press the clamping block 9, and when the movable contact 412 is close to the second arm 3 until the clamping block 9 abuts against the pressing block 32, the clamping block 9 and the pressing block 32 can keep a clamping state under the elastic force driving of the elastic structure 31.

In addition, the second support arm 3, the elastic structure 31, the pressing block 32, the fixture block 9, the fuse 8, the conductor 5 and the first support arm 2 can all conduct electricity, when overcurrent current is introduced into the drop-out fuse of the embodiment of the invention, the fuse 8 will be fused, and the fixture block 9 will fall off from the movable contact 412 of the tube body 41 after losing the tension force effect of the fuse 8, so that the fuse tube 4 after the fuse 8 is fused falls off under the action of gravity, thereby cutting off the electrical connection between the first support arm 2 and the second support arm 3, and playing a role of breaking a circuit. When the circuit needs to be switched on again, the fuse wire 8 is not required to be installed again after the fuse tube 4 is taken down from the power distribution system, the plurality of the fuse tubes 4 which fall are directly overturned upwards until the clamping block 32 of the next fuse tube 4 is abutted against the pressing block 9, and the effect of quickly replacing the fuse wire 8 and the circuit is achieved. Therefore, the drop-out fuse 8 provided by the embodiment of the invention is low in replacement difficulty and high in replacement efficiency.

In addition, the conductor 5 and the connecting plate 10 are adopted to fix the static contacts 411 of the plurality of fusion tubes 4, the length of a single fusion tube 4 can be shortened, and the manufacturing cost of the whole drop-out fuse is further reduced.

In one embodiment, the conductor 5 includes a first guide rod 51 and a second guide rod 52 arranged at an included angle, the first guide rod 51 is connected with the connecting plate 10, and the second guide rod 52 is hinged with the first arm 2. The two guide rods arranged at the included angle are convenient for connecting the connecting plate 10 and the first supporting arm 2 to be hinged, so that the conductor 5, the connecting plate 10 and all the fusion tubes 4 are prevented from interfering with the first supporting arm 2 in position when rotating, and the rotating smoothness is ensured.

In the present embodiment, the first guide rod 51 is perpendicular to the second guide rod 52. Preferably, the first conductor bar 51 is connected to the middle of the second conductor bar 52 to form a T-shaped conductor 5.

The length of the first guide rod 51 extends along the length direction of the pipe body 41, a groove 21 with an upward opening is formed in the first support arm 2, and the second guide rod 52 is inserted into the groove 21 and can rotate in the groove 21. When the fuse wire 8 in the tube body 41 is completely broken, the second guide rod 52 can be separated from the groove 21, so that the purpose of detaching the fuse tube 4 from the first arm 2 is achieved.

In one embodiment, as shown in fig. 5 and referring to fig. 1, all the fixed contacts 411 are detachably connected to the connection board 10. The lower end of the fusion tube 4 (i.e. the end where the static contact 411 is located) is detachably connected with the connecting plate 10, so that the assembly difficulty of the fusion tube 4 and the connecting plate 10 can be reduced.

Preferably, the connecting plate 10 is fixedly provided with a base 11, and the fixed contact 411 of the tube body 41 is clamped and/or screwed into the base 11, so that the positions of the tube body 41 and the connecting plate 10 are relatively fixed.

The connection board 10 and the base 11 are electrically conductive, and the fuse 8 is electrically conducted with the conductor 5 through the connection board 10 and the base 11. The connection plate 10 and the base 11 are directly conductive, so that each fuse 8 can be electrically connected with the conductor 5. In other embodiments, the connecting board 10 and the base 11 may also be made of an insulating material, and specifically, a second through hole is opened on the connecting board 10 or the base 11 corresponding to each fuse 8, and the fuse 8 is connected to the conductor 5 through the second through hole, so as to achieve electrical conduction between the fuse 8 and the conductor 5. In this embodiment, the connecting plate 10 and the base 11 serve to fix all the fuse tubes 4 and the conductors 5, and the second through holes on the connecting plate 10 are used for the fuses 8 to pass through, so as to ensure that each fuse 8 can avoid the connecting plate 10 or the base 11 to be electrically connected with the conductors 5.

In one embodiment, the plurality of melt tubes 4 are arranged in a straight line. Preferably, the outer walls of two adjacent fusion tubes 4 are adjacent or in contact. The design can reduce the occupied area of the fusion tubes 4, and more fusion tubes 4 are distributed on the set first support arm 2.

In one embodiment, referring to fig. 1 and 2, each of the melting tubes 4 is fixedly disposed therebetween, and when the falling melting tube 4 is rotated upward to be close to the second arm 3, the latch 9 on each of the movable contacts 412 can be tightly abutted against the pressing block 32.

Further, with continued reference to fig. 1, the rotation radius of each fusion tube 4 is consistent to ensure that the latch 9 on the movable contact 412 can abut against the pressing block 32.

Preferably, all fusion tubes 4 pass through pipe clamp 7 fixed connection, pipe clamp 7 is including dismantling the first splint and the second splint that set up, fusion tubes 4 press from both sides and establish first splint with between the second splint, be provided with the link that supplies the insulator spindle operation on the pipe clamp 7. Through setting up pipe clamp 7, can make all fusion tubes 4 keep in the state that needs, do not take place displacement or rotation each other, and all fusion tubes 4 rotate for an organic whole promptly to make every fusion tube 4 can both accurate rotate to the position of fixture block 9 on the moving contact 412 and briquetting 32 joint.

Preferably, there are at least two pipe clamps 7, and both of the pipe clamps 7 clamp all of the fusion tubes 4, and all of the pipe clamps 7 are arranged at intervals along the length direction of the fusion tubes 4. The design can reduce the swinging of the independent fusion tubes 4 relative to the first support arm 2 when all the fusion tubes 4 rotate synchronously.

In another embodiment, referring to fig. 3, the end surface of the tube body 41 away from the first arm 2 is further provided with a positioning block 6, the positioning block 6 is provided with positioning holes therethrough, each positioning hole can accommodate a fuse 8, and the positioning holes are arranged corresponding to the first through holes 413 and can extend the fuse 8 out of the tube body 41 through the positioning holes. Moreover, since the width of the positioning block 6 is smaller than that of the latch 9, the latch 9 is prevented from falling into the tube body 41.

Preferably, the tube body 41 is made of a heat insulating material, and is capable of insulating heat emitted when the fusible link 8 is blown, and preventing heat from being transferred between adjacent fusible tubes 4 to damage the unused fusible link 8.

In another embodiment, referring to fig. 1 and 2, the pressing block 32 is provided with a guiding portion 321 and a clamping portion 322, the guiding portion 321 is disposed on a side away from the insulating support 1, the clamping portion 322 can be clamped with the clamping block 9, and the guiding portion 321 is used for guiding the clamping block 9 of the fuse 8 to be clamped with the clamping portion 322 of the pressing block 32, so that the connection efficiency of the fuse 8 and the fuse tube 4 with the second support arm 3 is further improved, and the connection difficulty is reduced.

The pressing block 32 includes a body 323 and a limiting portion 324 which are vertically connected, and the body 323 and the limiting portion 324 form the right-angle notch-shaped clamping portion 322 therebetween. The right-angle notch-shaped clamping portion 322 not only facilitates clamping of the clamping block 9, but also facilitates separation of the clamping block 9 from the pressing block 32 after the fuse wire 8 is broken. Certainly, the body 323 and the limiting portion 324 are not limited to be connected, and the body 323 and the limiting portion 324 may be arranged at intervals, for example, as shown in fig. 6, the pressing block 32 includes the body 323 and the limiting portion 324 which are arranged at intervals, the body 323 is connected with the elastic structure 31, the body 323 abuts against the upper end of the latch 9, the limiting portion 324 is fixed on the second arm 3, the limiting portion 324 abuts against the side of the latch 9, the limiting portion 324 is located on one side of the latch 9 close to the insulating support 1, and the clamping portion 322 is formed between the body 323 and the limiting portion 324.

The guiding portion 321 is disposed at an end of the body 323 away from the limiting portion 324, and is used for guiding the latch 9 to move into the engaging portion 322. Preferably, the guide portion 321 is a circular arc portion.

In the present embodiment, the first through hole 413 is opened at the center of the tube body 41 of the fusion tube 4, and therefore the latch 9 is also positioned at the center of the end surface of the movable contact 412 of the tube body 41.

The contact surfaces of the fixture block 9 and the clamping portion 322 are matched, and the contact surfaces of the fixture block 9 and the clamping portion 322 are arc-shaped, so that the fixture block 9 can be more easily pushed into the clamping portion 322 to be clamped with the pressing block 32.

In other embodiments, in order to reduce the pulling force of the fuse wire 8 caused by the impact force of the latch 9 at one end of the movable contact 412 when the fuse tube 4 is turned over and the clamping force of the fuse wire 8 when the fuse tube 4 is clamped with the pressing block 32, and reduce the breakage probability of the fuse wire 8 in the state that the fuse tube 4 is turned over, the shape of the latch 9 is optimized, as shown in fig. 3, the latch 9 includes a main body 91 clamped with the pressing block 32, the main body 91 at least has two abutting portions 92 extending towards the fuse tube 4, and the two abutting portions 92 are clamped at the end of the fuse tube 4. The abutting portion 92 disperses the impact force, and reduces the effect of the impact force on the fuse 8. In this embodiment, the latch 9 is suspended, that is, a part of the latch 9 is suspended on one side of the fusion tube 4 close to the insulating support 1, and the suspended part of the latch 9 is clamped with the pressing block 32.

Preferably, the area of the abutment portion 92 on the side close to the insulating mount 1 abutting the outer side wall of the fusion tube 4 is smaller than the area of the abutment portion 92 on the side far from the insulating mount 1 abutting the outer side wall of the fusion tube 4. The design can ensure that the clamping block 9 with a special structure can be separated from the fuse tube 4 after the fuse wire 8 is fused.

An arc transition structure 93 is arranged between one side of the movable contact 412, which is far away from the pressing block 32, and the outer side wall of the tube body 41, and a right-angle transition structure 94 is arranged between one side of the movable contact 412, which is close to the pressing block 32, and the outer side wall of the tube body 41. The circular arc transition structure 93 enables the latch 9 to be more easily separated from the tube body 41 of the fusion tube 4.

Of course, in other embodiments, the side of the movable contact 412 away from the pressing block 32 and the side close to the pressing block 32 and the outer side wall of the tube body 41 may be directly provided with the circular arc transition structure 93, or both provided with the right-angle transition structure 94.

Not limited to the abutting portion 92, a ring of sleeving portion may be provided on the main body 91 on a side close to the fusion tube 4, the sleeving portion is sleeved on an end portion of the fusion tube 4, and the sleeving portion can also play a similar role as the abutting portion 92.

In another embodiment, in order to reduce the difficulty that the latch 9 can be separated from the fuse tube 4 after the fuse 8 is fused, as shown in fig. 4, a portion of the latch 9 abuts against an end surface of the movable contact 412, a portion of the latch 9 is suspended on one side of the fuse tube 4 close to the insulating support 1, and a portion of the latch 9 which is suspended is clamped with the pressing block 32. The hanging fixture block 9 can be quickly separated from the fuse tube 4 after the fuse wire 8 is fused.

Preferably, a limiting bump 414 is convexly arranged on an end surface of the movable contact 412, and one side of the latch 9 away from the insulating support 1 abuts against the limiting bump 414. The limiting bump 414 is arranged to ensure that the clamping block 9 does not deflect towards one side far away from the pressing block 32 when the fuse tube 4 rotates to the clamping block 9 on the movable contact 412 and is in impact clamping with the pressing block 32, so that the fuse wire 8 is further prevented from being broken in the impact process.

The movable contact 412 is provided with arc extinguishing holes (not shown) penetrating therethrough, and the arc extinguishing holes are spaced apart from one side of the first through hole 413. By arranging the arc extinguishing hole, the arc generated after the fuse wire 8 is fused is extinguished through the arc extinguishing hole.

The arc extinguishing hole is not limited to be additionally arranged, and the fixture block 9 can only block part of the first through hole 413.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in a descriptive sense or a positional relationship based on the orientation shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. A drop-out fuse is characterized by comprising an insulating support (1), a first support arm (2), a second support arm (3), a plurality of fuse tubes (4) and a plurality of fuses (8), wherein the first support arm (2) and the second support arm (3) are respectively and fixedly arranged at two end parts of the insulating support (1), each fuse tube (4) comprises a tube body (41), each tube body (41) comprises a fixed contact (411) and a movable contact (412) which are oppositely arranged, all the fixed contacts (411) are connected with a connecting plate (10), a conductor (5) is arranged at one side of the connecting plate (10) far away from the tube body (41), one end of the conductor (5) far away from the connecting plate (10) is hinged with the first support arm (2), the fuse wire (8) is tightly arranged in each tube body (41), and a first through hole (413) is arranged in a penetrating manner in the movable contact (412), one end, far away from the fixed contact (411), of the fuse wire (8) penetrates through the first through hole (413) and is fixedly provided with a fixture block (9), the fixture block (9) abuts against one side, far away from the fixed contact (411), of the first through hole (413), the end portion of the second support arm (3) is provided with an elastic structure (31) and a pressing block (32), the fixture block (9) can be clamped with the pressing block (32), the elastic structure (31) always has a tendency of driving the pressing block (32) to press the fixture block (9), and the second support arm (3), the elastic structure (31), the pressing block (32), the fixture block (9), the fuse wire (8), the conductor (5) and the first support arm (2) can conduct electricity.

2. A drop fuse as claimed in claim 1, wherein all of said stationary contacts (411) are detachably connected to said connecting plate (10).

3. A drop-out fuse as claimed in claim 2, characterised in that the connecting plate (10) is fixedly provided with a seat (11), the stationary contact (411) of the tube body (41) being snapped into and/or screwed into the seat (11) so that the tube body (41) and the connecting plate (10) are fixed in position relative to each other.

4. A drop fuse as claimed in claim 3, wherein the connecting plate (10) and the base (11) are electrically conductive, the fuse wire (8) being in electrical communication with the conductor (5) through the connecting plate (10) and the base (11); or the like, or, alternatively,

the connecting plate (10) or the base (11) is made of insulating materials, a second through hole is formed in the connecting plate (10) or the base (11) corresponding to each fuse wire (8), and the fuse wires (8) penetrate through the second through holes to be connected with the conductor (5) so that the fuse wires (8) are electrically conducted with the conductor (5).

5. A drop-out fuse according to claim 1, characterised in that a plurality of said fusion tubes (4) are arranged in a straight line.

6. A drop fuse as claimed in claim 1, characterised in that all the fusion tubes (4) are fixed together.

7. The drop-out fuse according to claim 6, characterized in that all the fusion tubes (4) are fixedly connected through a tube clamp (7), the tube clamp (7) comprises a first clamping plate and a second clamping plate which are detachably arranged, and the fusion tubes (4) are clamped between the first clamping plate and the second clamping plate.

8. A drop-out fuse as claimed in claim 7, characterised in that there are at least two said tube clamps (7), both said tube clamps (7) clamping all said fusion tubes (4), all said tube clamps (7) being spaced apart along the length of said fusion tubes (4).

9. A drop-out fuse as claimed in claim 1, wherein the end face of the movable contact (412) of the tube body (41) is further provided with a positioning block (6), the positioning block (6) is provided with positioning holes in a penetrating manner, each positioning hole can accommodate the fuse wire (8), the positioning holes correspond to and communicate with the first through holes (413), and the width of the positioning block (6) is smaller than that of the fixture block (9).

10. A drop-out fuse as claimed in claim 1, characterised in that the press block (32) is provided with a guide portion (321) and a snap-in portion (322), the guide portion (321) being provided on a side remote from the insulating support (1), the snap-in portion (322) being capable of snap-in engagement with the snap-in block (9).

11. A drop-out fuse as claimed in claim 10, wherein the pressing block (32) comprises a body (323) and a limiting portion (324) which are vertically connected, and a right-angle notch-shaped clamping portion (322) is formed between the body (323) and the limiting portion (324); or the like, or, alternatively,

the pressing block (32) comprises a body (323) and a limiting portion (324) which are arranged at intervals, the body (323) is connected with the elastic structure (31), the body (323) abuts against the upper end of the clamping block (9), the limiting portion (324) is fixed on the second support arm (3), the limiting portion (324) abuts against the side edge of the clamping block (9), the limiting portion (324) is located on one side, close to the insulating support (1), of the clamping block (9), and the clamping portion (322) is formed between the body (323) and the limiting portion (324).

12. A drop-out fuse as claimed in claim 11, wherein the guiding portion (321) is disposed at an end of the body (323) away from the limiting portion (324) for guiding the latch (9) to move into the catch portion (322).

13. A drop out fuse as claimed in claim 1, wherein said movable contact (412) is provided with arc extinguishing holes therethrough, said arc extinguishing holes being spaced apart on one side of said first through hole (413); or the like, or, alternatively,

the fixture block (9) only shields a part of the position of the first through hole (413).

14. A drop-out fuse as claimed in claim 10, wherein the contact surfaces of the latch (9) and the catching portion (322) are fitted to each other, and the contact surfaces of the latch (9) and the catching portion (322) are arc-shaped.

15. The drop-out fuse according to claim 1, wherein the fixture block (9) comprises a main body (91) clamped with the pressing block (32), the main body (91) at least has two abutting parts (92) extending towards the fusion tube (4), the two abutting parts (92) are clamped at the end part of the fusion tube (4), the fixture block (9) is partially suspended at one side of the fusion tube (4) close to the insulating support (1), and the suspended part of the fixture block (9) is clamped with the pressing block (32);

or, fixture block (9) include with main part (91) of briquetting (32) joint, main part (91) are close to one side of fusion tube (4) is provided with the round portion of cup jointing, the cover of cup jointing portion is established the tip of fusion tube (4), fixture block (9) part is unsettled fusion tube (4) are close to one side of insulating support (1), just the unsettled part that sets up of fixture block (9) with briquetting (32) joint.

16. A drop-out fuse as claimed in claim 15, characterised in that an arc transition structure (93) or a right angle transition structure (94) is provided between the side of the movable contact (412) remote from the press block (32) and the outer side wall of the tube body (41); or an arc transition structure (93) or a right-angle transition structure (94) is arranged between one side of the movable contact (412) close to the pressing block (32) and the outer side wall of the pipe body (41).

17. The drop-out fuse according to claim 1, characterized in that the fixture block (9) partially abuts against the end face of the movable contact (412), and partially hangs over the side of the fuse tube (4) close to the insulating support (1), and the suspended portion of the fixture block (9) is clamped with the pressing block (32); or the like, or, alternatively,

the end face of the moving contact (412) is convexly provided with a limiting convex block (414), one side, far away from the insulating support (1), of the fixture block (9) is abutted to the limiting convex block (414), part of the fixture block (9) abuts against the end face of the moving contact (412), part of the fixture block is suspended on one side, close to the insulating support (1), of the fusion tube (4), and the suspended part of the fixture block (9) is clamped with the pressing block (32).