CN219497705U

CN219497705U - Fuse link

Info

Publication number: CN219497705U
Application number: CN202320479564.2U
Authority: CN
Inventors: 刘玉忠; 叶艺辉; 刘媛媛; 何鹏; 张长周; 李昆铭
Original assignee: Xi'an Saiertean Electronics Co ltd
Current assignee: Xiamen Celtic Electronics Co ltd
Priority date: 2022-11-18
Filing date: 2023-03-14
Publication date: 2023-08-08
Anticipated expiration: 2033-03-14

Abstract

The utility model relates to the field of circuit protection devices, in particular to a fuse link. The utility model discloses a fuse link, which comprises a melt and an insulating shell; the melt is provided with a melt and two end electrode plates arranged at two ends of the melt, the shell is provided with a closed installation cavity, the melt is arranged in the installation cavity, and the two end electrode plates respectively penetrate through the shell and extend out of the shell; the outer side of the shell is provided with two supporting parts extending outwards, and the two end electrode plates are respectively attached and fixed on the two supporting parts. The utility model has the advantages of few parts, simple assembly, simple process and high reliability, and the support part is arranged to enable the end electrode plate to be thinner, so that the cost is low, the mechanical strength requirement can be ensured, and the reliability is high.

Description

Fuse link

Technical Field

The utility model belongs to the field of circuit protection devices, and particularly relates to a fuse link with an end electrode, which can be connected with electrical connection terminals such as copper bars and the like.

Background

The fuse link means that when the current exceeds a specified value, the internal melt temperature exceeds the melt melting point to melt the melt, so that the circuit is broken, and the fuse link is one of the most commonly used protection devices as a protector for short circuit and overcurrent. In the prior art, the fuse link and the terminal electrode are connected into a whole by an independent contact knife and a welding disc, the welding disc is welded with an internal melt, the contact knife is fixed together by the welding disc and an end cover plate through screws, and the cover plate is fixed on the end face of the ceramic shell through screws; and the metal inner cap with the through hole is riveted on the circular tube ceramic tube, the melt is welded on the inner cap of the tube, and then the end cap with the end electrode is riveted on the inner cap to form the sealed fuse link. Because the contact knife head or the end electrode for bolting are all independent parts assembled on the body of the fuse link, the installation procedure can not be omitted, and meanwhile, the contact knife head and the bonding pad of some products are welded together by two parts because of the functions of electric connection and mechanical connection with the outside, and the contact knife and the bonding pad which are integrally formed by hot pressing have no problems due to the occasional weak welding fracture caused by external force when being installed with a copper bar, but have higher cost and consume a large amount of heat energy in the manufacturing process; in summary, the contact tool bit of the low-voltage fuse link or the end electrode for bolting is an independent part formed on the fuse link, which has complex structure, needs to bear the electrical connection and the mechanical supporting function, has higher cost and has a certain hidden quality trouble.

In order to solve the above problems, in the prior art, an integrated fuse link, an end electrode and a melt are in an integrated structure, but in order to maintain a certain mechanical strength, the thickness of the end electrode needs to be thicker, and a very thin electrode sheet cannot realize the electric connection and mechanical supporting function at the same time, so that the cost is high, and the structure is only suitable for products which are not filled with arc extinguishing sand in the fuse link and have extremely low breaking capacity, such as insert fuses with voltage below 250V on an automobile, and the structure is not suitable for low-voltage fuse products with high rated current, high voltage and high breaking capacity in an electric power system.

Disclosure of Invention

The present utility model is directed to a fuse link for solving at least some of the above problems.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a fuse link comprising a melt and an insulating housing; the melt is provided with a melt and two end electrode plates arranged at two ends of the melt, the shell is provided with a closed installation cavity, the melt is arranged in the installation cavity, and the two end electrode plates respectively penetrate through the shell and extend out of the shell; the outer side of the shell is provided with two supporting parts extending outwards, and the two end electrode plates are respectively attached and fixed on the two supporting parts.

Further, the two end electrode plates are formed by integrally extending two ends of the fusible body outwards or connecting two metal plates.

Further, the shell comprises a first shell and a cover plate, and the first shell is provided with an opening; the cover plate sealing cover is arranged on the opening end of the first shell, and two ends of the cover plate respectively protrude out of the first shell to form the two supporting parts.

Furthermore, two clamping grooves matched with the melt are formed in the end face of the opening of the first shell, two ends of the melt are respectively embedded in the two clamping grooves, two ends of the melt are respectively provided with limiting protrusions, and the two limiting protrusions respectively lean against the outer sides of the two clamping grooves.

Further, the novel plastic box further comprises a second shell, the second shell is provided with an opening, the sealing cover on the other surface of the cover plate, which is far away from the first shell, is arranged at the opening end of the second shell, the two ends of the cover plate respectively protrude out of the second shell, the cover plate and the first shell form a first sealed installation cavity, the cover plate and the second shell form a second sealed installation cavity, the number of melts is multiple, and the melts of the multiple melts are respectively arranged in the first installation cavity and the second installation cavity.

Further, the cover plate is of a flat plate structure, or the middle part of the cover plate is of a trapezoid structure, or the middle part of the cover plate part is of an arch structure, an annular baffle protruding towards the inside of the first shell is arranged on the cover plate, the annular baffle is embedded in the opening end of the first shell, and the outer peripheral surface of the annular baffle is attached to the inner wall of the first shell.

Further, the shell comprises a first shell and a second shell which are opened, and the first shell and the second shell are mutually covered to form a closed installation cavity; the outer side wall of the first shell or the second shell is provided with two convex plates extending outwards to form the two supporting parts.

Further, the shell comprises a first shell and a second shell which are opened, and the first shell and the second shell are mutually covered to form a closed installation cavity; the outer side walls of the first shell and the second shell are respectively provided with two convex plates extending outwards, and the two convex plates of the first shell are respectively and oppositely attached to the two convex plates of the second shell to form the two supporting parts.

Furthermore, the installation cavity is filled with arc extinguishing medium.

Furthermore, the meltable body is arranged in a sequentially-high and low mode from one end to the other end, a plurality of narrow neck portions are arranged on the meltable body, and the plurality of narrow neck portions are arranged at intervals along the two ends of the meltable body.

The beneficial technical effects of the utility model are as follows:

the utility model has the advantages of few parts, simple assembly and simple process, the support part is arranged to enable the end electrode plate to be thinner, the cost is low, the mechanical strength requirement can be ensured, the installation cavity is provided, the arc extinguishing medium can be filled, and the breaking capacity is improved.

In addition, be equipped with towards protruding annular baffle in the first casing on the apron, annular baffle inlays and establishes in first casing open end and annular baffle's outer peripheral face and the laminating of the inner wall of first casing, both guaranteed the leakproofness can prevent electric arc blowout shell simultaneously, improves the security.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded perspective view of a first embodiment of the present utility model;

fig. 2 is a perspective view of a first embodiment of the present utility model;

fig. 3 is a structural view of a first housing of a first embodiment of the present utility model;

FIG. 4 is an exploded view of a second embodiment of the present utility model;

FIG. 5 is a cross-sectional view of a third embodiment of the utility model;

FIG. 6 is a cross-sectional view of a fourth embodiment of the utility model;

FIG. 7 is a cross-sectional view of a fifth embodiment of the utility model;

fig. 8 is a perspective view of a sixth embodiment of the present utility model;

FIG. 9 is an exploded perspective view of a sixth embodiment of the present utility model;

fig. 10 is a structural view of a first casing of a sixth embodiment of the present utility model.

Detailed Description

For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present utility model. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The utility model will now be further described with reference to the drawings and detailed description.

Example 1

As shown in fig. 1 to 3, a fuse link comprises a melt 1 and an insulating housing 2; the melt 1 has a meltable body 11 and two electrode plates 12 provided at both ends of the meltable body 11. The shell 2 is provided with a closed installation cavity, the fusible body 11 is arranged in the installation cavity, and the two end electrode plates 12 respectively penetrate through the shell 2 and extend out of the shell 2; the outer side of the housing 2 is provided with two supporting parts 31 extending outwards, the two end electrode plates 12 are respectively attached to the two supporting parts 31, and the outer ends of the two supporting parts 31 are respectively flush with the outer ends of the two end electrode plates 12.

In the specific embodiment, the material of the melt 1 can be made of pure copper material, and has high conductivity, large rated current, small resistance and low power consumption, and can easily meet the requirement of high breaking current capacity. Of course, in other embodiments, the melt 1 may also be made of silver material or lead-tin alloy material, etc.

In this embodiment, the installation cavity is further filled with an arc extinguishing medium (not shown in the figure); the arc extinguishing medium is quartz sand, has an insulating effect, can block and cool high-temperature electric arcs, plays an arc extinguishing role, and improves safety. Of course, in other embodiments, the quenching medium may also be other fillers, without being limited thereto.

In this embodiment, the housing 2 is made of an insulating material, which may be ceramic, bakelite, or other engineering plastics.

In this embodiment, as shown in fig. 1, the housing 2 includes a first housing 20 and a cover plate 30, where the first housing 20 has an opening and only one plane is set, and the first housing 20 has an open mounting cavity 21, and in this embodiment, the first housing 20 may be molded by injection molding, hollowing or fixing with nails; the cover plate 30 seals the cover on the open end of the first housing 20, i.e., the cover plate 30 closes the open end of the mounting cavity 21 of the first housing 20 to form a closed mounting cavity. Two ends of the cover plate 30 respectively protrude outside the first housing 20 to form two supporting parts 31, and the two electrode plates 12 are respectively clung to the two supporting parts 31; the two supporting parts 31 have supporting function on the two end electrode plates 12, so that the end electrode plates 12 can be made thinner, the cost is reduced, the mechanical strength can be met, the end electrode plates 12 are protected from being damaged or broken easily, and the reliability is improved.

In this embodiment, the cover plate 30 and the first housing 20 are fixedly connected together by a fastening structure (not shown in the drawings), however, in other embodiments, the cover plate 30 and the first housing 20 may be fixedly connected together by pin connection, strap connection, welding, etc., which is not limited thereto. With the housing 2, the structure is simple and easy to realize, however, in other embodiments, the two supporting portions 31 may be formed by extending out from two outer side walls of the first housing 20.

The open end of the first shell 20 is provided with two clamping grooves 22 which are matched with the melt 1, and two ends of the melt 1 are respectively embedded in the two clamping grooves 22. Specifically, the cross section of the open end of the first housing 20 is a rectangular structure, which has two long sides and two short sides, the two clamping grooves 22 are respectively arranged on the two short sides, the fusible body 11 is arranged in the mounting cavity 21, and the two end electrode plates 12 respectively extend out from two ends of the fusible body 11 and are embedded in the two clamping grooves 22. Of course, in other embodiments, the cross section of the open end of the first housing 20 may have other shapes, and the positions of the two clamping grooves 22 may be set according to the use situation.

In the present embodiment, the depth of the two clamping grooves 22 is consistent with the thickness of the melt 1 embedded in the clamping grooves 22; when the cover plate 30 is arranged at the open end of the first casing 20 (as shown in fig. 2), the outer side surface of the melt 1 and the open end surface of the first casing 20 are ensured to be in the same horizontal plane, so that the open end of the first casing 20 is sealed, and the arc extinguishing medium is sealed in the installation cavity 21, so that the problem of leakage cannot occur. The structure is simple and compact; the sealing performance is good, and the installation is convenient.

Further, as shown in fig. 1, two limiting protrusions 14 are respectively arranged at two ends of the melt 1, and the two limiting protrusions 14 respectively lean against the outer sides of the two clamping grooves 22 to limit the melt 1 in the clamping grooves 22, so that the melt cannot move along the horizontal direction. When the cover plate 30 is covered on the first shell 20, the melt 1 is fixed in the clamping groove 22, so that the structure is stable and the movement is not easy.

In this embodiment, as shown in fig. 1, the cover plate 30 has a flat plate structure, and the cover plate 30 has two long sides and two short sides. The two short sides of the cover plate 30 are the same size as the two short sides of the first housing 20. When the cover plate 30 is disposed at the open end of the first housing 20, the outer side surface of the cover plate 30 is flush with the outer side surface of the first housing 20 in the longitudinal direction of the first housing 20. Compact and sealed and beautiful (as shown in figure 2).

In this embodiment, as shown in fig. 1, the two end electrode plates 12 are respectively provided with a first fixing hole 13, the two supporting parts 31 are respectively provided with a second fixing hole 301 corresponding to the first fixing hole 13 of the two end electrode plates 12, and the end electrode plates 12 and the supporting parts 31 are fixed and clung together through the first fixing holes 13 and the second fixing holes 301. Specifically, the support portion 31 is fixedly connected to the terminal electrode sheet 20 by bolts penetrating through the first and second fixing holes 13 and 301. The first and second fixing holes 13 and 301 may have a racetrack-shaped structure, a circular structure, or the like. Of course, in other embodiments, the fixing may be performed by inserting pins through the first fixing holes 13 and the second fixing holes 301, and those skilled in the art may design the fixing according to circumstances.

In this embodiment, the two end electrode plates 12 are formed by integrally extending the two ends of the fusible body 11 outwards, and are formed by processing the same thin metal sheet, so that the manufacturing process is simple.

Of course, in some embodiments, the two-end electrode plates 12 may also be formed by welding two metal plates to the two ends of the fusible body 11; the terminal electrode plate 12 and the fusible body 11 can be welded by adopting different metal materials, for example, the terminal electrode plate 12 is made of copper materials, and the fusible body 11 is made of alloy materials. The two-end electrode sheet 12 and the fusible body 11 may be fixed together by laser welding, resistance welding, high-frequency welding, ultrasonic welding, or the like.

In this embodiment, as shown in fig. 1, the fusible body 11 is arranged in a stepwise manner from one end to the other end thereof; the linear length of the fusible body 11 is greater than the length of the first housing 20; and the meltable body 11 is provided with a plurality of narrow neck parts 15, and the narrow neck parts 15 are arranged at intervals along the two ends of the melt body 1. The breaking capacity of the melt 1 is improved, the breaking speed is high, the performance of the melt 1 is stable, and the safety is high.

Of course, in some embodiments, the number of the melts 1 may be multiple, and the multiple melts 1 are stacked in parallel, specifically, two electrode plates 12 of the multiple melts 1 are stacked in sequence, and multiple meltable 11 are arranged at intervals, so that the passing current can be increased.

Example two

The difference between the present embodiment and the first embodiment is mainly that the cover plate 30 'and the first housing 20' are different in structure, specifically, as shown in fig. 4, the cover plate 30 'of the present embodiment includes a protruding portion 301' with a convex shape in a shape of a letter-like shape in the middle and two supporting portions 302 'located at two ends of the cover plate 30'; the protruding part 301' is higher than the two supporting parts 302', and the two end electrode plates 12 are respectively fixedly attached to the two supporting parts 302'; the ends of the two supporting portions 302 'are arc-shaped structures, and the outer ends of the two supporting portions 302' protrude from the outer ends of the two electrode plates 12 respectively. The long side of the open end face of the first housing 20' is provided with a groove 202' adapted to the boss 301 '. When the cover plate 30 'is provided to cover the open end of the first housing 20', the boss 301 'seals the cover on the groove 202'. The fuse link is suitable for a special-shaped installation space.

Of course, in some embodiments, the middle portion of the cover plate 30' may have any shape, such as a stepped shape, a dome shape, etc., and the cover plate is not limited thereto, and one skilled in the art may design the cover plate as needed.

Example III

As shown in fig. 5, the difference between the present embodiment and the first embodiment is mainly that: in this embodiment, the housing 2 further includes a second casing 40, the second casing 40 is disposed in an opening of the second casing 40, the second casing 40 is disposed on one side of the cover plate 30 facing away from the first casing 20, a sealing cover (in this embodiment, a lower surface is a lower surface, taking fig. 5 as a reference, but not limited to this) of the other surface of the cover plate 30 facing away from the first casing 20 is disposed on an opening end of the second casing 40, and two ends of the cover plate 30 protrude from the second casing 40 respectively, the cover plate 30 and the first casing 20 form a first sealed installation cavity, the cover plate 30 and the second casing 40 form a second sealed installation cavity, the number of melts 1 is 2, and the melts 11 of 2 melts 1 are disposed in the first installation cavity and the second installation cavity respectively.

Of course, in some embodiments, the number of melts 1 may also be 3, 4, 5, etc.

The first installation cavity and the second installation cavity are filled with arc extinguishing medium 3; the arc extinguishing medium 3 is quartz sand, has an insulating effect, can block and cool high-temperature electric arcs, plays an arc extinguishing effect, and improves safety. Of course, in other embodiments, the extinguishing medium 3 may also be other fillers, without being limited thereto.

In this embodiment, the length of the end electrode piece 12 of the melt 1 is longer than the length of the supporting portion 31, and the outer end portion of the end electrode piece 12 is bent and extended along the outer end surface of the supporting portion 31 to be fixedly attached to the outer end surface of the supporting portion 31.

In the present embodiment, the first housing 20 and the second housing 40 have the same structure and are easy to manufacture, but are not limited thereto.

Example IV

As shown in fig. 6, the difference between the present embodiment and the third embodiment is mainly that: in this embodiment, the cover plate 30 is omitted from the housing 2, the first housing 20 and the second housing 40 are directly covered and fixed with each other to form a closed installation cavity, and the first housing 20 and the second housing 40 are fixedly connected together through a fastening structure (not shown in the figure), however, in other embodiments, the first housing 20 and the second housing 40 are fixedly connected together through pin connection, strap connection, welding, and the like.

The two outer side walls of the first housing 20 and the second housing 40 corresponding to the two end electrodes 12, in this embodiment, left and right outer side walls (taking fig. 6 as a reference, but not limited to this, respectively) are provided with protruding plates 23 and 41 extending outwards, the two protruding plates 23 of the first housing 20 are respectively bonded with the two protruding plates 41 of the second housing 40 oppositely to form two supporting parts 31, and the end electrode plates 12 of the melt 1 pass through between the protruding plates 23 and 41 and are bent to extend to be bonded and fixed on the outer surfaces of the protruding plates 23 and/or the protruding plates 41 for electrical connection. With this structure, the first housing 20 and the second housing 40 can be identical in structure, simple in production process, and convenient in installation.

In the embodiment, the number of the melts 1 is 2, the 2 melts 1 are arranged in parallel up and down, the meltable bodies 11 of the 2 melts 1 are arranged in a mounting cavity, and the mounting cavity is filled with an arc extinguishing medium 3; the arc extinguishing medium 3 is quartz sand, has an insulating effect, can block and cool high-temperature electric arcs, plays an arc extinguishing effect, and improves safety. Of course, in other embodiments, the extinguishing medium 3 may also be other fillers, without being limited thereto. The lengths of the end electrode plates 12 of the 2 melts 1 are longer than the lengths of the supporting parts 31, the end electrode plates 12 of the 2 melts 1 penetrate through the space between the convex plates 23 and 41, and the end electrode plates 12 of the melts 1 positioned above are bent and extend to bypass the outer end surfaces of the convex plates 23 to be attached and fixed on the upper surfaces of the convex plates 23; the terminal electrode plates 12 of the melt 1 located below are bent and extended to bypass the outer end surface of the convex plate 24 until being attached and fixed on the lower surface of the convex plate 24, so that the distribution of the terminal electrode plates 12 is more uniform, but the utility model is not limited thereto.

Of course, in some embodiments, the quantity of melt 1 may also be 1 or more than 2.

Example five

As shown in fig. 7, the difference between the present embodiment and the fourth embodiment is mainly that: the first casing 20 is not provided with a convex plate 23, the left and right outer side walls of the second casing 40 are respectively provided with a convex plate 41 extending outwards to form two supporting parts 31, the length of the end electrode plate 12 of the melt 1 is longer than that of the supporting parts 31, the end electrode plate 12 is fixedly attached to the upper surface of the convex plate 41, and the outer end part of the end electrode plate 12 is bent and extended along the outer end surface of the convex plate 41 to be fixedly attached to the outer end surface of the convex plate 41. The bending structure of the terminal electrode sheet 12 of the present embodiment is simpler than that of the fourth embodiment, and the length of the terminal electrode sheet 12 can be relatively shorter, with lower cost.

Of course, in some embodiments, it is also possible that the first housing 20 is provided with a boss forming support and the second housing 40 is not provided with a boss.

Example six

As shown in fig. 8 to 10, the present embodiment differs from the first embodiment mainly in that: the cover plate 30 of this embodiment is provided with the annular baffle 302 protruding toward the inside of the installation cavity 21 of the first housing 20, when the cover plate 30 is sealed and arranged on the opening end of the first housing 20, the annular baffle 302 is embedded in the opening end of the first housing 20, and the outer peripheral surface of the annular baffle 302 is attached to the inner wall of the first housing 20, so that the tightness of the installation cavity is ensured, meanwhile, the electric arc is prevented from being sprayed out of the housing, and the safety is improved. The annular baffle 302 and the inner wall of the first housing 20 may have a rectangular, polygonal, racetrack structure, etc.

In this embodiment, the cover plate 30 and the first housing 20 are preferably fixedly connected together by screws, so that the cover plate is stable and easy to disassemble, and accordingly, threaded holes 303 and 201 are respectively formed in the cover plate 30 and the first housing 20.

In this embodiment, the outer ends of the two end electrode plates 12 further extend to the outer end surfaces of the two supporting portions 31 respectively, the outer ends of the end electrode plates 12 are provided with buckles 121, the outer end surfaces of the supporting portions 31 are provided with clamping columns 311, and the outer ends of the end electrode plates 12 are fixed on the outer end surfaces of the supporting portions 31 through the buckles 121 and the clamping columns 311 in a clamping manner, so that the structure is more stable and compact. The clamping column 311 can be a cylinder, a cuboid, an hourglass column, etc.

In this embodiment, the width of the supporting portion 31 is the same as the width of the outer end of the end electrode plate 12, the width of the supporting portion 31 is smaller than the width of the middle portion of the cover plate 30, the size of the middle portion of the cover plate 30 is the same as the size of the surface where the opening of the first housing 20 is located, when the cover plate 30 is covered at the opening end of the first housing 20, along the long side direction of the first housing 20, the outer side surface of the middle portion of the cover plate 30 is flush with the outer side surface of the first housing 20, and the structure is more compact and attractive. Of course, in other embodiments, the two short sides of the cover plate 30 may be larger than the two short sides of the first housing 20.

The utility model can be used for the protection of low-voltage lines with the voltage of 72VDC over 110 VAC.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A fuse link, characterized in that: comprising a melt and an insulating shell; the melt is provided with a melt and two end electrode plates arranged at two ends of the melt, the shell is provided with a closed installation cavity, the melt is arranged in the installation cavity, and the two end electrode plates respectively penetrate through the shell and extend out of the shell; the outer side of the shell is provided with two supporting parts extending outwards, and the two end electrode plates are respectively attached and fixed on the two supporting parts.

2. A fuse link as claimed in claim 1, wherein: the two-end electrode plates are formed by integrally extending two ends of the fusible body outwards or connecting two metal plates.

3. A fuse link as claimed in claim 1 or claim 2, wherein: the shell comprises a first shell and a cover plate, and the first shell is provided with an opening; the cover plate sealing cover is arranged on the opening end of the first shell, and two ends of the cover plate respectively protrude out of the first shell to form the two supporting parts.

4. A fuse link as claimed in claim 3, wherein: two clamping grooves matched with the melt are formed in the end face of the opening of the first shell, two ends of the melt are respectively embedded in the two clamping grooves, two ends of the melt are respectively provided with limiting protrusions, and the two limiting protrusions respectively lean against the outer sides of the two clamping grooves.

5. A fuse link as claimed in claim 3, wherein: still include the second casing, second casing opening sets up, and the sealed lid of another surface of keeping away from first casing is established on the open end of second casing and the both ends of apron are outstanding in the second casing respectively, and apron and first casing form confined first installation cavity, and apron and second casing form confined second installation cavity, and the quantity of fuse-element is a plurality of, and the fuse-element of a plurality of fuse-elements sets up respectively in first installation cavity and second installation cavity.

6. A fuse link as claimed in claim 3, wherein: the cover plate is of a flat plate structure, or the middle part of the cover plate is of a trapezoid structure, or the middle part of the cover plate is of an arch structure, an annular baffle protruding towards the inside of the first shell is arranged on the cover plate, the annular baffle is embedded in the opening end of the first shell, and the outer peripheral surface of the annular baffle is attached to the inner wall of the first shell.

7. A fuse link as claimed in claim 1 or claim 2, wherein: the shell comprises a first shell and a second shell which are opened, and the first shell and the second shell are mutually covered to form a closed installation cavity; the outer side wall of the first shell or the second shell is provided with two convex plates extending outwards to form the two supporting parts.

8. A fuse link as claimed in claim 1 or claim 2, wherein: the shell comprises a first shell and a second shell which are opened, and the first shell and the second shell are mutually covered to form a closed installation cavity; the outer side walls of the first shell and the second shell are respectively provided with two convex plates extending outwards, and the two convex plates of the first shell are respectively and oppositely attached to the two convex plates of the second shell to form the two supporting parts.

9. A fuse link as claimed in claim 1, wherein: and the installation cavity is filled with arc extinguishing medium.

10. A fuse link as claimed in claim 1, wherein: the melt is arranged from one end to the other end in a sequentially-high and low mode, a plurality of narrow neck portions are arranged on the melt, and the plurality of narrow neck portions are arranged at intervals along the two ends of the melt.