CN114038723A

CN114038723A - Drop-out fuse

Info

Publication number: CN114038723A
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: 2022-02-11
Anticipated expiration: 2041-11-09
Also published as: CN114038723B

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 static contact, a moving contact and an elastic part, the static 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 static 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 static contact, the first support arm, the second support arm, the static contact, the moving contact and the fuses can conduct electricity, a fixture block is arranged at the end part of the fuse far away from the static contact, the moving contact is provided with a clamping groove and a winding column, and the fixture block is detachably connected with the clamping groove. The drop-out fuse disclosed by the invention is simple in structure, low in replacement and installation 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

When the drop-out fuse in the prior art normally operates, the fuse tube forms a closed position after being tensioned by the fuse wire. When the system has a fault, the fault current leads the fuse wire to be rapidly fused and form an electric arc, the arc extinguishing pipe is burnt by the electric arc, a large amount of gas is decomposed, high voltage is formed in the pipe and flows along the pipeline strongly, and the electric arc is rapidly elongated and extinguished. 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.

When taking place the electric power accident, need demolish the fuse of fusing from the fusion tube, in changing new fuse and the installation again after the location installation fuse installs distribution lines, however the fuse tube that needs to be changed on the whole distribution system is more, and the installation degree of difficulty of installing new fuse in the fusion tube is big moreover, and the change is inefficient.

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 drop-out fuse comprises 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 of the insulating support, the second support arm is fixedly arranged at the other end of the insulating support, the fusion tube comprises a tube body, a static contact, a moving contact and an elastic part, the static contact is fixedly connected with one end of the tube body, the moving contact is hinged with the other end of the tube body, the elastic part is arranged between the side wall of the moving contact and the outer side wall of the tube body, the static contact is hinged with the first support arm, the moving contact is detachably connected with the second support arm, the elastic part always has the tendency of driving the moving contact to approach the outer side wall of the tube so that the moving contact can fall off the second support arm, the fuse wire is arranged in the tube body, one end of each fuse wire is fixedly connected with the inner wall of one end, close to the static contact, of the tube body, the first support arm, the second support arm, the static contact, the moving contact and the fuse wire can conduct electricity, a fixture block is arranged at the end, far away from the static contact, of the fuse wire, the moving contact is provided with a clamping groove and a winding column, the fixture block is detachably connected with the clamping groove, and the fuse wire can be wound on the winding column so that the relative angle between the moving contact and the tube body can be adjusted through the tightened fuse wire.

As a preferred scheme of the drop-out fuse, a plurality of through holes are formed in the end face, away from the fixed contact, of the tube body in a penetrating manner, each through hole can accommodate the fuse wire, the sectional area of the fixture block is larger than that of each through hole, and arc extinguishing holes are formed in two end faces of the tube body.

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

As a preferred scheme of the drop-out fuse, a positioning block is further arranged on the end face, away from the fixed 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 through holes, and the width of each positioning block is smaller than that of the corresponding fixture block.

As a preferred scheme of drop out fuse, draw-in groove ladder groove, the draw-in groove is including first mounting groove and the second mounting groove that is linked together, the groove width of second mounting groove is greater than the width of fixture block, the groove width of first mounting groove is less than the width of fixture block, just the groove width of first mounting groove is greater than the diameter of fuse.

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

As an optimal 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 tendency of driving the pressing block to press the moving contact.

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 moving contact.

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 is connected with the second elastic structure, the body is tightly abutted to the upper end of the moving contact, the limiting part is fixed on the second support arm, the limiting part is abutted to the side edge of the moving contact, the limiting part is located on one side, close to the insulating support, of the moving contact, and a right-angle notch-shaped clamping part is formed between the limiting part and the body.

As a preferable scheme of the drop-out fuse, a clamping structure is arranged at an end of the second support arm, the clamping structure includes a first clamping portion, a second clamping portion and an elastic hinge portion, the elastic hinge portion is arranged between the first clamping portion and the second clamping portion, and the elastic hinge portion always has a tendency of driving the first clamping portion to approach the second clamping portion so as to clamp and fix the moving contact.

As a preferable scheme of the drop-out fuse, an arc extinguishing tube is wrapped on the periphery of the fuse wire, and two ends of the fuse wire penetrate through a tube hole at the end part of the arc extinguishing tube and are positioned outside the arc extinguishing tube.

As a preferable mode of the drop-out fuse, all of the fuse wires are annularly arranged along an inner wall of the tube body; or the like, or, alternatively,

one ends of all the fuses are arranged on the end face of the tube body close to one end of the movable contact at intervals, and the other ends of all the fuses are arranged on the end face of the tube body close to one end of the fixed contact at intervals; or the like, or, alternatively,

and one ends of the fuse wires close to the static contact are gathered together, and the other ends of the fuse wires are arranged on the end surface of one end of the tube body close to the movable 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 of the insulating support, and the second support arm is fixedly arranged at the other end of the insulating support. The fusion tube comprises a tube body, a fixed contact and a movable contact, wherein the fixed contact is fixedly connected with one end of the tube body, the movable contact is hinged with the other end of the tube body, an elastic part is arranged between the side wall of the movable contact and the side wall of the tube body, the fixed contact is hinged with the first support arm, the movable contact is detachably connected with the second support arm, the positions of the fusion tube and the insulating support can be limited, and the elastic part has a trend of driving the movable contact to be close to the outer side wall of the tube body all the time so as to enable the movable contact to be separated from the second support arm and fall. The fuse wire is arranged in the tube body, one end of each fuse wire is fixedly connected with the static contact, a fixture block is arranged at the end, away from the static contact, of each fuse wire, the moving contact is provided with a clamping groove and a winding column, the fixture block is detachably connected with the clamping groove, the fuse wire can be wound on the winding column, the remaining length of the fuse wire can be changed by the fuse wire wound on the winding column, and the tensile force of the fuse wire is adjusted, so that the relative angle between the moving contact and the tube body can be adjusted by the tightened fuse wire. The tension of the fuse wire after being tightened and the elasticity of the elastic part are kept balanced, so that the length direction of the movable contact is kept parallel to the length direction of the tube body, and the fuse tube can be fixed between the first support arm and the second support arm after the movable contact is detachably connected with the second support arm. Because the first support arm, the second support arm, the fixed contact, the movable contact and the fuse wire can conduct electricity, when the drop-out fuse disclosed by the embodiment of the invention is subjected to overcurrent, the fuse wire is fused to cut off the electric connection, the fuse wire has no tension, the elastic part drives the side wall of the movable contact to be close to the outer side wall of the tube body, so that the movable contact is separated from the second support arm and falls, and the drop-out fuse realizes overcurrent protection on a distribution line. When the fuse wire needs to be replaced, the fuse tube is taken down from the first support arm, any remaining fuse wire is wound on the winding column, the tension force and the remaining length of the fuse wire are adjusted, the clamping block at the end part of the fuse wire is clamped in the clamping groove of the movable contact, the angle position of the movable contact and the tube body is fixed, the fixed contact is hinged with the first support arm, then the tube body is driven to rotate upwards until the movable contact is connected with the second support arm, and the fuse tube can be fixedly installed between the first support arm and the second support arm again. Therefore, the drop-out fuse disclosed by the embodiment of the invention can reduce the replacement and installation difficulty of the fuse wire and improve the replacement efficiency of the fuse wire.

Drawings

The invention is explained in more detail below with reference to the figures 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 view of a portion of the structure at A in the embodiment of FIG. 1.

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 view of a portion of the structure at B in the embodiment of FIG. 4.

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 view of a portion of the structure at C in the embodiment of FIG. 6.

In the figure:

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

2. a first support arm; 21. a groove;

3. a second support arm; 31. a clamping structure; 311. a first clamping portion; 312. a second clamping portion; 313. an elastic hinge portion; 32. a guide bar; 33. an unlocking lever;

4. a fusion tube; 41. a tube body; 411. a through hole; 412. positioning blocks; 413. the outer side wall of the tube; 42. static contact; 43. a moving contact; 431. a card slot; 4311. a first mounting groove; 4312. a second mounting groove; 432. winding the column; 44. an elastic portion; 45. a rotating rod;

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

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 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 to one end of the tube body 41, the movable contact 43 is hinged to the other end of the tube body 41, the elastic portion 44 is disposed between a side wall of the movable contact 43 and an outer side wall 413 of the tube body 41, the fixed contact 42 is hinged to the first support arm 2, the movable contact 43 is detachably connected to the second support arm 3, the elastic portion 44 always has a tendency of driving the movable contact 43 to approach the outer side wall 413 of the tube body 41, so that the movable contact 43 falls off the second support arm 3, the fuse 5 is arranged in the tube body 41, one end of each fuse 5 is fixedly connected with the inner wall of the tube body 41 close to one end of the static contact 42, the first support arm 2, the second support arm 3, the static contact 42, the movable contact 43 and the fuse 5 are conductive, a fixture block 6 is arranged at the end of the fuse 5 far away from the static contact 42, the movable contact 43 is provided with a clamping groove 431 and a winding column 432, the fixture block 6 is detachably connected with the clamping groove 431, and the fuse 5 can be wound on the winding column 432, so that the relative angle between the movable contact 43 and the tube body 41 can be adjusted by the tightened fuse 5.

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 a 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 tube 4 comprises a tube body 41, a fixed contact 42, a movable contact 43 and an elastic part 44, the fixed contact 42 is fixedly connected with one end part of the tube body 41, the movable 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 movable contact 43 and the outer side wall 413 of the tube body 41, the elastic part 44 always has a tendency of driving the movable contact 43 to approach the 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, and the positions of the fusion tube 4 and the insulating support 1 can be limited. The fuse wire 5 is arranged in the tube body 41, one end of each fuse wire 5 is fixedly connected with the inner side wall of the tube body 41, the end of each fuse wire 5, which is far away from the static contact 42, is provided with a fixture block 6, the movable contact 43 is provided with a clamping groove 431 and a winding column 432, the fixture block 6 is detachably connected with the clamping groove 431, the fuse wire 5 can be wound on the winding column 432, the fuse wire 5 wound on the winding column 432 can change the residual length of the fuse wire 5, and the tension force of the fuse wire 5 is adjusted, so that the relative angle between the movable contact 43 and the tube body 41 of the tightened fuse wire 5 can be adjusted.

The tension of the fuse 5 and the elastic force of the elastic part 44 are balanced after being tightened, so that the length direction of the movable contact 43 is kept parallel to the length direction of the tube body 41, and the fuse tube 4 can be fixed between the first arm 2 and the second arm 3 after the movable 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 movable contact 43 and the fuse 5 are electrically conductive, when the drop-out fuse of the embodiment of the present invention is subjected to an overcurrent, the fuse 5 is fused to cut off the electrical connection, the fuse 5 has no tension, and at this time, the elastic portion 44 drives the side wall of 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 falls off, and the drop-out fuse realizes overcurrent protection for the distribution line.

When the fuse 5 needs to be replaced, the fuse tube 4 is taken down from the first support arm 2, any remaining fuse 5 is wound on the winding column 432, the tension force and the remaining length of the fuse 5 are adjusted, the fixture block 6 at the end part of the fuse 5 is clamped in the clamping groove 431 of the movable contact 43, the angular position of the movable contact 43 and the tube body 41 is fixed, the fixed contact 42 is hinged with the first support arm 2, then the tube body 41 is driven to rotate upwards until the movable contact 43 is connected with the second support arm 3, and the fuse tube 4 can be fixedly arranged between the first support arm 2 and the second support arm 3 again. Therefore, the drop-out fuse of the embodiment of the invention can reduce the difficulty in replacing and installing the fuse wire 5 and improve the replacement efficiency of the fuse wire 5.

In one embodiment, referring to fig. 2, a plurality of through holes 411 are penetratingly formed on an end surface of the tube body 41 away from the fixed contact 42, each through hole 411 can accommodate the fuse 5, a cross-sectional area of the fixture 6 is larger than a cross-sectional area of the through hole 411, and arc extinguishing holes are formed on two end surfaces of the tube body 41. The stopper 6 is stopped outside the tube body 41 by the through hole 411, which has an effect of preventing the fuse wire 5 and the stopper 6 from falling into the tube body 41; through setting up the arc-extinguishing hole, the electric arc that produces after fuse 5 melts is through the arc-extinguishing hole arc extinguishing, guarantees that other fuse 5 are not influenced.

Preferably, the arc extinguishing holes are disposed 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 positions of the arc extinguishing holes correspond to those of the through holes 411 one by one.

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 tension the fuse 5, so that each fuse 5 in the tube body 41 is disposed at an interval due to the tension, and other unused fuses 5 are prevented from being fused due to the contact between the fuses 5.

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

Still further, referring to fig. 1, the end surface of the tube body 41 away 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 wire 5, and the positioning holes are arranged corresponding to the through holes 411 and can enable the fuse wire 5 to extend out of the tube body 41 through the positioning holes. Moreover, when the fuse wire 5 is retracted and tightened by the first elastic structure 51, the latch 6 can abut against the positioning block 412, and since the width of the positioning block 412 is smaller than that of the latch 6, a gap exists between the latch 6 and the tube body 41, which is convenient for taking the latch 6.

In another embodiment, referring to fig. 3, the locking groove 431 is a stepped groove, the locking groove 431 includes a first mounting groove 4311 and a second mounting groove 4312, a groove width of the second mounting groove 4312 is greater than or equal to a width of the latch 6, the latch 6 can move along a groove wall of the second mounting groove 4312, and the latch 6 can be accommodated in the second mounting groove 4312. And the groove width of first mounting groove 4311 is less than the width of fixture block 6, and the groove width of first mounting groove 4311 is greater than the diameter of fuse 5, utilize first mounting groove 4311 to hold fuse 5 and block that fixture block 6 in second mounting groove 4312 breaks away from second mounting groove 4312, move fixture block 6 along the cell wall of second mounting groove 4312 until fixture block 6 breaks away from with second mounting groove 4312, then can play the effect of dismantling fixture block 6 on the draw-in groove 431, realize the connection dismantled of draw-in groove 431 and fixture block 6. Specifically, the first mounting groove 4311 and the second mounting groove 4312 are both communicated with the outside along one end of the moving direction of the latch 6 (the moving direction is parallel to the direction of the bottom of the second mounting groove 4312 as shown in fig. 3) to form an opening, and the latch 6 slides into the second mounting groove 4312 from the opening, and the first mounting groove 4311 restricts the latch 6 from being separated from the movable contact 43.

Preferably, with continued reference to fig. 3, a winding post 432 is provided at an interval at one side of the notch of the first mounting groove 4311, and a winding post 432 is provided in an orientation direction of the first mounting groove 4311, so as to reduce contact of the fuse 5 with the first mounting groove 4311, thereby reducing a risk of the fuse 5 being scratched by the first mounting groove 4311.

In addition, referring to fig. 1 and 3, the end portion 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 of urging the first clamping portion 311 to approach the second clamping portion 312 so as to clamp and fix the movable contact 43. When the movable contact 43 needs to be fixed, the first clamping portion 311 is driven to be away from the second clamping portion 312, the movable contact 43 can be placed between the first clamping portion 311 and the second clamping portion 312, and the movable contact 43 is clamped by the first clamping portion 311 approaching to the second clamping portion 312 under the elastic force action of the elastic hinge portion 313, so that the movable contact 43 can be fixed. Alternatively, when the movable contact 43 needs to be released, the first clamping portion 311 is also driven to be away from the second clamping portion 312, the clamping of the movable contact 43 by the first clamping portion 311 and the second clamping portion 312 is released, and the movable contact 43 can be easily pulled away from the first clamping portion 311 and the second clamping portion 312. Therefore, the clamping structure 31 has simple and convenient operation for clamping the movable contact 43 and good clamping effect.

In order to facilitate the separation of the first clamping portion 311 and the second clamping portion 312, an unlocking lever 33 is disposed on the second clamping portion 312, and when the unlocking lever 33 is pulled, the second clamping portion 312 can be driven to overcome the elastic force of the elastic hinge portion 313 and be separated from the first clamping portion 311.

In other embodiments, the clamping structure 31 is not limited to be provided, and other structures may also be used to fix the movable contact 43, as shown in fig. 4 and 5, a second elastic structure 7 and a pressing block 8 are provided on the second arm 3, an upper end of the movable 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 movable contact 43. The second elastic structure 7 can support the pressing block 8 against the movable contact 43, so that the end of the movable contact 43 can be kept in a relatively fixed state with the second support arm 3 in a state that the fuse wire 5 is tightened, when the drop-out fuse disclosed by the embodiment of the invention is subjected to overcurrent, the fuse wire 5 is fused to cut off the electrical connection, the fuse wire 5 has no tension, at the moment, the elastic part 44 drives the side wall of the movable contact 43 to approach the outer side wall 413 of the tube body 41, the pressing block 8 is separated from the movable contact 43, so that the movable contact 43 is separated from the second support arm 3 and falls off, and the drop-out fuse realizes overcurrent protection on a distribution line.

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 far away from the insulating support 1, and the clamping portion 82 can be clamped with the movable 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 the body 83 and the limiting portion 84 form the right-angle notch-shaped clamping portion 82 therebetween. The right-angle notch-shaped clamping portion 82 is convenient for clamping the moving contact 43 and also is 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 an end of the body 83 away from the limiting portion 84, and is used for guiding the movable 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 the difference is only that the pressing block 8 has a structure that is separate, that is, the pressing block 8 includes a body 83 and a limiting portion 84 that are arranged at an interval, the body 83 is connected with the second elastic structure 7, the body 83 abuts against the upper end of the movable contact 43, the limiting portion 84 is fixed on the second arm 3, the limiting portion 84 abuts against the side of the movable contact 43, the limiting portion 84 is located on the side of the movable contact 43 close to the insulating support 1, and a right-angled 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 movable contact 43, and the impact force generated when the movable contact 43 turns over to the pressing block 8 directly acts on the limiting part 84, and the stress of the limiting part 84 can be increased by using the second support arm 3.

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

Optionally, referring to fig. 2, the outer periphery of the fuse wire 5 is wrapped by an arc tube 52, and both ends of the fuse wire 5 pass through tube holes at the ends of the arc tube 52 and are located outside the arc tube 52. The arc that produces after fuse 5 melts is put out the arc through arc tube 52, and arc tube 52 can isolate the heat in each fuse 5 outside, avoids unused fuse 5 by the mistake heating and fusing.

In particular, referring to fig. 1 and 2, the second arm 3 further extends to be provided with guide rods 32, 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 be under the second arm 3 through the guiding and limiting of the guide rods 32, so that the connection between the second arm 3 and the movable contact 43 is facilitated.

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 stationary contact 42 is provided with a rotating rod 45, the groove 21 can accommodate the rotating rod 45, and the rotating rod 45 is rotatably disposed in the groove 21, so as to facilitate the separation of the stationary contact 42 from the first arm 2 while realizing the hinge connection of the stationary contact 42 with the first arm 2. When the fuse wire 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 separating the fuse tube 4 from the first support arm 2 is achieved.

In particular, with reference to fig. 1, the side of the insulating support 1 remote from the fusion tube 4 is provided with a fixing seat 11, said fixing seat 11 being used to fixedly connect the insulating support 1 with an external connecting element, such as a support for a distribution line, or an electric pole.

All of the fusing filaments 5 are annularly arranged along the inner wall of the tube body 41. In other embodiments, one ends of all the fuses 5 close to the fixed contact 42 are gathered together, and the other ends are spaced apart from an end surface of one end of the tube body 41 close to the movable contact 43. The design can reduce the fixing point of the fuse 5 close to one end of the static contact 42, and reduce the fixing difficulty. Alternatively, one end of each of the fuses 5 is disposed at an end surface of the tube body 41 close to one end of the movable contact 43 at an interval, and the other end of each of the fuses 5 is disposed at an end surface of the tube body 41 close to one end of the fixed contact 42 at an interval. The design can prevent the fuses 5 from contacting each other, reduce the influence of the fuses 5 on each other, and prevent the influence of other fuses 5 even if one of the fuses 5 is broken.

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 fuse tube (4) and a plurality of fuses (5), wherein the first support arm (2) is fixedly arranged at one end of the insulating support (1), the second support arm (3) is fixedly arranged at the other end of the insulating support (1), the fuse tube (4) comprises a tube body (41), a fixed contact (42), a movable contact (43) and an elastic part (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), the elastic part (44) is arranged between the side wall of the movable contact (43) and the outer tube side wall (413) of the tube body (41), and 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 part (44) always has a tendency of driving the movable contact (43) to approach the outer side wall (413) of the tube, so that the movable contact (43) is separated from the second support arm (3) and falls off, 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 wall of the tube body (41) close to one end of the fixed contact (42), the first support arm (2), the second support arm (3), the fixed contact (42), the movable contact (43) and the fuse wires (5) can conduct electricity, a clamping block (6) is arranged at the end part of the fuse wire (5) far away from the fixed contact (42), the movable contact (43) is provided with a clamping groove (431) and a winding column (432), and the clamping block (6) is detachably connected with the clamping groove (431), the fuse wire (5) can be wound on the winding column (432), so that the relative angle between the movable contact (43) and the pipe body (41) can be adjusted by the tightened fuse wire (5).

2. A drop-out fuse as claimed in claim 1, wherein a plurality of through holes (411) are formed through an end surface of the tube body (41) far from the fixed contact (42), each through hole (411) can accommodate the fuse wire (5), a cross-sectional area of the fixture block (6) is larger than a cross-sectional area of the through hole (411), and arc extinguishing holes are formed in two end surfaces of the tube body (41).

3. A drop fuse as claimed in claim 2, characterised in that the fuse wire (5) is provided with a first resilient structure (51), the first resilient structure (51) always having a tendency to urge the fuse wire (5) taut.

4. A drop-out fuse as claimed in claim 2, wherein a positioning block (412) is further disposed on an end surface of the tube body (41) away from the fixed contact (42), the positioning block (412) is provided with positioning holes, each positioning hole is capable of accommodating the fuse wire (5), the positioning holes correspond to and communicate with the through holes (411), and a width of the positioning block (412) is smaller than a width of the fixture block (6).

5. The drop-out fuse according to claim 1, wherein the clamping groove (431) is a stepped groove, the clamping groove (431) comprises a first mounting groove (4311) and a second mounting groove (4312) which are communicated with each other, the width of the second mounting groove (4312) is greater than the width of the clamping block (6), the width of the first mounting groove (4311) is less than the width of the clamping block (6), and the width of the first mounting groove (4311) is greater than the diameter of the fuse wire (5).

6. A drop out fuse as claimed in claim 5, wherein the winding post (432) is spaced apart on one side of the slot of the first mounting slot (4311).

7. A drop-out fuse as claimed in claim 1, characterised in that the second arm (3) is provided with a second resilient structure (7) and a pressure block (8), the upper end of the movable contact (43) can be clamped to the pressure block (8), and the second resilient structure (7) has a tendency to urge the pressure block (8) to press the movable contact (43) at all times.

8. A drop out fuse as claimed in claim 7, wherein the press block (8) is provided with a guide portion (81) and a snap portion (82), the guide portion (81) being provided at a side remote from the insulating support (1), the snap portion (82) being capable of snap-engaging with the movable contact (43).

9. A drop-out fuse as claimed in claim 8, wherein the pressing block (8) comprises a body (83) and a limiting portion (84) which are vertically connected, and a right-angle notch-shaped clamping portion (82) is formed between the body (83) and the limiting portion (84); or the like, or, alternatively,

the pressing block (8) comprises a body (83) and a limiting portion (84) which are arranged 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 the side edge of the moving contact (43), the limiting portion (84) is located on one side, close to the insulating support (1), of the moving contact (43), and the clamping portion (82) is formed between the limiting portion (84) and the body (83).

10. A drop-out fuse as claimed in claim 1, characterised in that the end of the second arm (3) is provided with a clamping structure (31), the clamping structure (31) comprising a first clamping portion (311), a second clamping portion (312) and an elastic articulation (313), the elastic articulation (313) being arranged between the first clamping portion (311) and the second clamping portion (312), the elastic articulation (313) always having a tendency to urge the first clamping portion (311) towards the second clamping portion (312) so as to clamp and fix the movable contact (43).

11. A drop-out fuse as claimed in claim 1, wherein an arc tube (52) is wrapped around the fuse wire (5), and both ends of the fuse wire (5) pass through the tube holes at the ends of the arc tube (52) and are located outside the arc tube (52).

12. A drop fuse according to claim 1, characterised in that all said fuse wires (5) are arranged annularly along the inner wall of said tube body (41); or the like, or, alternatively,

one ends of all the fuses (5) are arranged on the end surface of the tube body (41) close to one end of the movable contact (43) at intervals, and the other ends of all the fuses (5) are arranged on the end surface of the tube body (41) close to one end of the fixed contact (42) at intervals; or the like, or, alternatively,

one ends of all the fuse wires (5) close to the fixed contact (42) are gathered together, and the other ends are arranged on the end surface of one end of the tube body (41) close to the movable contact (43) at intervals.