Fuse structure with double-element protection and time delay performance

Abstract

The invention relates to the technical field of electrical safety protection devices, in particular to a fuse structure with double-element protection and time delay performance. The fuse structure comprises: a tube body; the contact terminals are arranged at the two ends of the tube body and abut against the tube body respectively; the sleeving piece is provided with a through hole relative to the contact terminal, the sleeving piece penetrates through the contact terminal through the through hole and is arranged on the pipe body in a sleeving manner, and a sealed arc extinguishing cavity is formed by the sleeving piece and an inner cavity of the pipe body and is used for accommodating arc extinguishing sand; the connecting assembly is located in the arc extinguishing cavity and comprises a first connecting plate and a second connecting plate which are oppositely arranged; the overload protection assembly is located in the arc extinguishing cavity, the two ends of the overload protection assembly are connected with the first connecting plate and the second connecting plate respectively, and the overload protection assembly and the second connecting plate are connected through soldering tin with the low melting point and are fused at the high temperature; and the plurality of melt elements are positioned in the arc extinguishing cavity and are respectively connected between the first connecting plate and the contact terminal at one end and between the second connecting plate and the contact terminal at the other end.

Description

Technical Field

[0001] The present application relates to the technical field of electrical safety protection devices, and in particular to a fuse structure with dual-element protection and delay performance. Background Art

[0002] With the increase in the number of modern industrial and civil electrical equipment, higher requirements are placed on the safety of circuits. Although traditional fuses can achieve overcurrent protection functions to a certain extent, the design of their single components often cannot meet the needs of complex working conditions, and are prone to malfunction or failure in some cases. In addition, traditional fuses usually do not have sufficient delay characteristics to cope with transient current shocks, so it is difficult to adapt to the needs of high-precision control occasions. There are many types of improved fuses on the market, but there are still many limitations, such as overly complex structures leading to rising costs. Research and development in this field has always revolved around how to improve reliability and reduce costs, and has achieved remarkable results, while also driving the entire industry towards a more efficient and energy-saving direction. However, these advances still cannot completely overcome the inherent problems of existing products.

[0003] In order to improve the problems of traditional fuses, the industry has developed some new design solutions. Among them, the more common ones include traditional fuses that use a single high-speed fuse as the core component (the advantage is that the structure is simple and easy to produce and process, but the disadvantage is that the surge resistance is poor), large-capacity fuses composed of multiple low-rated fuses in series (this form can effectively disperse heat and thus improve the overall tolerance level, but the assembly is cumbersome and the large size is not convenient for installation and maintenance), and a composite structure based on metal oxide varistors (MOVs) attached to the outside of ordinary fuse cores (which can provide additional energy absorption space to reduce the temperature rise effect, but the stability decreases significantly after long-term use) and other typical representatives. Although the above-mentioned various approaches have their own advantages, from the perspective of practical application, there are still many areas that need to be optimized.

[0004] In general, current mainstream fuses generally have the following shortcomings: first, there is a lack of sufficiently powerful dual protection mechanism, and it is difficult to cut off the power supply in time to avoid damage when facing sudden strong current invasion; second, the delay characteristics are poor, especially in the face of spike pulses generated at the moment of startup; the last point is that the economic practicality is poor, either because of the complex internal structure resulting in high manufacturing costs, or because of the frequent replacement of parts that increase the subsequent operation and maintenance expenses. Summary of the invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide a fuse structure with dual-element protection and delay performance, which has dual-element protection and delay performance and can reduce cost investment based on structural design.

[0006] The present application provides a fuse structure with dual-element protection and time-delay performance, adopting the following scheme: A fuse structure with dual-element protection and delay performance, characterized in that it includes: a tube body; contact terminals, which are arranged at both ends of the tube body and respectively abut against the tube body; a sleeve member, which is provided with a through hole relative to the contact terminal, wherein the sleeve member passes through the through hole and the contact terminal is sleeved on the tube body, and forms a sealed arc-extinguishing cavity with the inner cavity of the tube body for accommodating arc-extinguishing sand; a connecting component, which is located in the arc-extinguishing cavity and includes a first connecting plate and a second connecting plate which are arranged opposite to each other; an overload protection component, which is located in the arc-extinguishing cavity and has two ends connected to the first connecting plate and the second connecting plate, respectively, wherein the overload protection component and the second connecting plate are connected via solder with a low melting point and fuse at high temperature; a fuse element, which is located in the arc-extinguishing cavity and is arranged in multiple numbers and is respectively connected between the first connecting plate and the contact terminal at one end and between the second connecting plate and the contact terminal at the other end.

[0007] By adopting the above technical solution, the fuse structure realizes dual-element protection and time-delay performance. Specifically, the tube body and the sleeve cooperate to form a sealed arc-extinguishing cavity, which can effectively accommodate arc-extinguishing sand, improve arc-extinguishing ability, and thus improve safety. The first connecting plate and the second connecting plate in the connecting assembly are arranged relative to each other, which provides a stable connection for the circuit and facilitates the installation of the fuse element and the overload protection assembly. The overload protection assembly is connected to the second connecting plate through a low-melting-point solder, which can be quickly melted under high temperature conditions, and the current can be cut off in time to prevent equipment damage or fire hazards. Multiple fuse elements are distributed between the first connecting plate and the contact terminal, and the second connecting plate and the contact terminal, which not only enhances the current carrying capacity, but also has a certain time-delay characteristic, which can not be melted immediately when overloaded for a short time, avoiding malfunction, and reliably disconnecting the circuit when overloaded for a long time or serious fault, ensuring dual protection function. In addition, based on the overall structural design, the cost investment can also be reduced.

[0008] Optionally, the overload protection component includes: a fixing part, an outer sleeve part, a supporting part, an elastic part and a movable core which are nested in sequence, one end of the movable core is sleeved on and compresses the elastic part and then passes through the supporting part to be exposed to the outer sleeve part and the fixing part in sequence, so as to be connected to the second connecting part through soldering, and the corresponding fixing part is provided with a first through hole, the outer sleeve part is provided with a second through hole, the supporting part is provided with a third through hole, and the end of the fixing part away from the second connecting part is connected to the first connecting plate.

[0009] By adopting the above technical solution, the fuse structure realizes a more accurate overload protection function. Specifically: the overload protection component is composed of a fixing part, an outer sleeve, a support part, an elastic part and a movable core. This design enables the entire device to have good mechanical stability and electrical performance, and can effectively cope with sudden large current shocks. One end of the movable core is sleeved and compressed, and then penetrates and exposes the elastic part to each component, and then connected to the second connecting plate via solder. This structure can respond quickly when the current is too large and the temperature rises, so as to achieve the purpose of accurately cutting off the circuit. The design of the first through hole on the fixing part, the second through hole on the outer sleeve, and the third through hole on the support part ensures the assembly accuracy, while helping to quickly dissipate heat, thereby improving the reliability and safety of the product. In this way, this solution significantly improves the adaptability and action sensitivity of the fuse under different working conditions.

[0010] Optionally, a convex edge for resisting the elastic member is provided at the end of the movable core away from the second connecting plate.

[0011] By adopting the above technical solution, the convex edge provided at the end of the movable core away from the second connecting plate can effectively prevent the elastic member from deflecting or falling off during the compression process, thereby ensuring the stability of the internal structure of the overload protection component.

[0012] Optionally, the end of the movable core away from the convex edge is in a frustum shape, and the end with a smaller cross-sectional area is closer to the second connecting plate.

[0013] By adopting the above technical solution, the frustum-shaped movable core design can open a gap between the outer wall of the movable core and the inner walls of the first through hole, the second through hole and the third through hole when the movable core moves away from the second connecting plate, so as to allow arc-extinguishing sand to enter the support member. In this process, the movement of the movable core can also make use of the fluidity of the arc-extinguishing sand to make its own movement smoother, thereby making the disconnection between the movable core and the second connecting plate faster, which in turn helps to improve the arc-extinguishing performance.

[0014] Optionally, one end of the fixing member connected to the first connecting plate is a symmetrical bending structure.

[0015] By adopting the above technical solution, the end of the fixing member connected to the first connecting plate is designed as a symmetrical bending structure, which can enhance the connection stability between the fixing member and the first connecting plate and improve the overall reliability of the structure. This design can effectively prevent loosening caused by external vibration or impact, while increasing the contact area, which helps to improve the heat conduction efficiency, thereby improving the working performance of the fuse in a high current environment.

[0016] Optionally, when the conduction current is 1-60A, the thickness of the connecting plate is ≤0.8mm; when the conduction current is 61-100A, the thickness of the connecting plate is 0.8-1.0mm; when the conduction current is 110A-200A, the thickness of the connecting plate is 1-1.5mm; when the conduction current is 200A-400A, the thickness of the connecting plate is 1.5-2.5mm; when the conduction current is above >400A, the thickness of the connecting plate is 2.5-3.0mm.

[0017] By adopting the above technical solution, the thickness of the connecting plate is set according to different conduction current ranges, which can effectively balance electrical performance and mechanical strength. Specifically, when the conduction current is small (1-60A), the thickness of the connecting plate is small (≤0.8mm), which can reduce material costs and meet basic load requirements; as the conduction current increases (61-100A, 110-200A, 200-400A, >400A), the thickness of the connecting plate is gradually increased (0.8-1.0mm, 1-1.5mm, 1.5-2.5mm, 2.5-3.0mm), ensuring sufficient current resistance and stability under high current, while avoiding excessive heating or damage due to insufficient thickness. This design not only improves the overall reliability of the fuse, but also optimizes the applicability and economy of the product.

[0018] Optionally, two of the melt elements are respectively arranged between the first connecting plate, the second connecting plate and the contact terminals at both ends.

[0019] By adopting the above technical solution, the fuse structure is provided with two fuse elements respectively between the first connection plate, the second connection plate and the contact terminals at both ends, which can significantly improve the reliability of circuit protection. Specifically, this design allows the current to be diverted through multiple paths, reducing the risk of failure of a single fuse element due to overload, thereby improving the stability and safety of the entire fuse.

[0020] Optionally, an identification groove is provided on one of the contact terminals.

[0021] By adopting the above technical solution, an identification groove can be set on one of the contact terminals, thereby realizing the direction identification function of the fuse, and effectively preventing circuit failures or safety hazards caused by installation errors.

[0022] Optionally, the contact terminal, the sleeve, the first connecting plate, the second connecting plate, the fixing member, the supporting member and the movable core are all made of copper; the outer sleeve is made of insulating material; and the tube body is a melamine tube.

[0023] By adopting the above technical solution, the overall structure of the fuse has excellent electrical conductivity and heat resistance. Specifically: the contact terminal, sleeve, first connecting plate, second connecting plate, fixing part, support part and movable core are all made of copper, which ensures good conductivity between the components, reduces resistance loss and improves current transmission efficiency. The outer set is made of insulating material, which effectively enhances the electrical insulation performance of the overload protection component and ensures the safe use of the fuse. The tube body uses melamine tube, which can not only withstand the working requirements in high temperature environment, but also further improves the sealing and stability of the arc extinguishing cavity, ensuring the effect of the internal arc extinguishing sand.

[0024] Optionally, two ends of the melt element are bent structures.

[0025] By adopting the above technical solution, the two ends of the fuse element are designed as a bent structure, which can effectively increase the contact area between the fuse element and the connecting plate, thereby improving the reliability of the electrical connection. At the same time, the bent structure helps to reduce contact resistance, reduce heating caused by poor contact, and improve the overall performance and stability of the fuse.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting up double fuse elements and overload protection components in the arc extinguishing chamber, a dual protection mechanism is realized, which can effectively deal with strong current invasion and improve the safety and reliability of the fuse; 2. The overload protection component is connected to the second connection plate through low-melting-point solder, which can be quickly melted under abnormally high temperatures. The arc-extinguishing sand can effectively suppress the generation of arcs, ensuring the rapidity and safety of the melting process; 3. The thickness design of the connecting plate is optimized for different conduction current ranges, which not only ensures the stable operation of the fuse under various working conditions, but also further improves the applicability and durability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional structural schematic diagram of a fuse structure with dual-element protection and delay performance disclosed in an embodiment of the present application; Figure 2 A schematic diagram of a partial explosion structure of a fuse structure with dual-element protection and delay performance disclosed in an embodiment of the present application; Figure 3 A schematic diagram of a cross-sectional structure of a fuse structure with dual-element protection and delay performance disclosed in an embodiment of the present application; Figure 4 for Figure 2 A partial structural diagram of a fuse structure with dual-element protection and time-delay performance disclosed in; Figure 5 for Figure 4 Schematic diagram of the exploded structure of the part of the structure disclosed in.

[0028] Description of reference numerals: 10. Tube body; 11. Arc extinguishing chamber; 20. Contact terminal; 21. Identification groove; 30. Set piece; 31. Through hole; 40. Connecting assembly; 41. First connecting plate; 42. Second connecting plate; 50. Overload protection assembly; 51. Fixing piece; 511. First through hole; 52. Outer set; 521. Second through hole; 53. Support piece; 531. Third through hole; 54. Elastic piece; 55. Movable core; 551. Convex edge; 60. Melt element. DETAILED DESCRIPTION

[0029] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items.

[0030] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0031] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1 and Figure 2 , is a fuse structure with dual-element protection and delay performance disclosed in an embodiment of the present application, including: a tube body 10, a contact terminal 20, a sleeve 30, a connecting component 40, an overload protection component 50 and a plurality of fuse elements 60.

[0033] The tube body 10 is made of a through melamine tube, which has both high strength and good flame retardant properties. Contact terminals 20 are provided at both ends of the tube body 10 and abut against the tube body 10. The contact terminals 20 are used in conjunction with the fuse base. The appearance of the contact terminals 20 can be as follows: Figure 2 As shown in FIG. 1 , one end of one of the contact terminals 20 is provided with an identification slot 21 for identifying the direction of the fuse to prevent circuit failure or safety hazards caused by installation errors.

[0034] See also Figure 2 and Figure 3 The sleeve 30 is made of copper, and a through hole 31 is provided on the sleeve 30 relative to the contact terminal 20. The sleeve 30 passes through the through hole 31 to penetrate the contact terminal 20 and is sleeved on the tube body 10, and abuts against the contact terminal 20. In conjunction with the setting of the through structure of the tube body 10, a sealed arc extinguishing chamber 11 can be formed to accommodate arc extinguishing sand.

[0035] The connection assembly 40 is located in the arc extinguishing chamber 11 and includes a first connection plate 41 and a second connection plate 42 that are arranged opposite to each other, and is used to provide a stable connection for the circuit while facilitating the installation of the fuse element 60 and the overload protection assembly 50 .

[0036] The overload protection component 50 is also located in the arc extinguishing chamber 11, and its two ends are respectively connected to the first connecting plate 41 and the second connecting plate 42, and connected to the second connecting plate 42 through a low melting point solder, so as to disconnect the overload protection component 50 from the second connecting plate 42 at high temperature. It is explained here that in the welding structure of the fuse, the solder used by the overload protection component 50 and the second connecting plate 42 has the lowest melting point.

[0037] There are multiple melt elements 60, which are distributed between the first connecting plate 41 and the contact terminal 20 at one end, and between the second connecting plate 42 and the contact terminal 20 at the other end, so as to play a protective role at both ends of the overload protection component 50. No matter which end the short-circuit current is generated from, it does not need to pass through the overload protection component 50 to be transmitted to the melt element 60 at the other end to play a short-circuit protection role.

[0038] Among them, the fuse elements 60 are set to 4, for example, and 2 fuse elements 60 are respectively arranged between the first connecting plate 41, the second connecting plate 42 and the contact terminals 20 at both ends, so that the current can be diverted through multiple paths, reducing the risk of failure of a single fuse element 60 due to overload, thereby improving the stability and safety of the entire fuse.

[0039] For details, see Figure 2 and Figure 3 The overload protection assembly 50 includes a fixing member 51 , an outer sleeve 52 , a supporting member 53 , an elastic member 54 and a movable core 55 .

[0040] See also Figure 4 and Figure 5 The fixing member 51 is made of copper, and one end connected to the first connecting plate 41 is set to a symmetrical bending structure (appearance as Figure 5), and further enhance the connection stability between the fixing member 51 and the first connecting plate 41 by welding, so as to effectively prevent the loosening phenomenon caused by external vibration or impact, and at the same time increase the contact area, which helps to improve the heat conduction efficiency, thereby improving the working performance of the fuse in a high current environment. In addition, a first through hole 511 is provided at one end of the fixing member 51 away from the first connecting plate 41, so as to allow the movable core 55 to pass through.

[0041] The outer sleeve 52 is made of insulating material, such as rubber, and is sleeved on the support member 53, which can effectively enhance the electrical insulation performance of the overload protection assembly 50 and ensure the safe use of the fuse. A second through hole 521 is also provided on the outer sleeve 52. The support member 53 is also made of copper, and is used to accommodate the elastic member 54 and the movable core 55. A third through hole 531 that penetrates the second through hole 521 is provided at one end away from the first connecting plate 41, so that one end of the movable core 55 passes through the third through hole 531, the second through hole 521, and the first through hole 511 in sequence to be exposed.

[0042] The elastic member 54 is placed inside the support member 53 and sleeved on one end of the movable core 55 close to the second connecting plate 42, and can generate a restoring force after being subjected to force. One end of the movable core 55 is in a frustum shape with a gradually decreasing cross-sectional area, close to one side of the second connecting plate 42, and the other end of the movable core 55 is provided with a convex edge 551 for blocking the elastic member 54 to prevent slipping.

[0043] The frustum-shaped movable core 55 is designed so that when the movable core 55 moves away from the second connecting plate 42, a gap is opened between the outer wall of the movable core 55 and the inner walls of the first through hole 511, the second through hole 521, and the third through hole 531, so as to allow arc extinguishing sand to enter the support member 53. In this process, the movement of the movable core 55 can also make its own movement smoother with the help of the fluidity of the arc extinguishing sand, so that the disconnection between the movable core 55 and the second connecting plate 42 can be faster, which also helps to improve the arc extinguishing performance.

[0044] During assembly, the movable core 55 is sleeved with the elastic member 54 and is located inside the support member 53. The movable core 55 compresses the elastic member 54 so that one end in the shape of a cone is exposed from the third through hole 531 of the support member 53, the second through hole 521 on the outer sleeve 52, and the first through hole 511 on the fixing member 51 in sequence, so as to be connected to the second connecting plate 42 by soldering. During the use of the fuse, if the temperature on the second connecting plate 42 reaches the melting point of the solder, the elastic member 54 drives the movable core 55 to quickly separate from the second connecting plate 42 based on the compression recovery force to achieve the circuit breaking operation.

[0045] See also Figure 4 The first connecting plate 41 and the second connecting plate 42 in the connecting assembly 40 are both made of copper, and the specific thickness is determined according to the current size, as follows: When the conducting current is 1-60A, the thickness does not exceed 0.8mm; when the conducting current is 61-100A, the thickness ranges from 0.8-1.0mm; when the conducting current is 110-200A, the thickness is 1-1.5mm; when the conducting current is 200-400A, the thickness is between 1.5-2.5mm; if the conducting current is greater than 400A, the thickness should be between 2.5-3.0mm. In this way, the thickness of the first connecting plate 41 and the second connecting plate 42 can be designed based on the current size to increase the applicability of the fuse product to the current of different equipment.

[0046] In addition, it is worth mentioning that the length of the melt element 60 and the thickness of the first connecting plate 41 and the second connecting plate 42 can be designed based on the current, thereby shortening the length of the melt element 60 and reducing the investment cost of the melt element 60 (using precious metal materials).

[0047] For further information, see Figure 2 The two ends of the fuse element 60 are processed into a bent structure, which can effectively increase the contact area between the fuse element 60 and the connection assembly 40, thereby improving the reliability of the electrical connection. At the same time, the bent structure helps to reduce the contact resistance, reduce the heating phenomenon caused by poor contact, and improve the overall performance and stability of the fuse.

[0048] In summary, the fuse structure with dual-element protection and delay performance disclosed in the embodiment of the present application realizes dual protection of the circuit by arranging a dual fuse element 60 and an overload protection component 50 in the arc extinguishing chamber 11, and effectively solves the problem that traditional fuses are prone to failure or malfunction due to the single-element design; low-melting-point solder is used to connect the overload protection component 50 and the second connecting plate 42 to ensure rapid response and circuit cutting under high temperature conditions, while the arc extinguishing sand in the sealed arc extinguishing chamber 11 greatly reduces the arc hazard; the thickness of the connecting component 40 is reasonably designed to match different conduction current ranges, taking into account the performance requirements and economy of the product, so that the fuse can maintain excellent working condition under various working conditions.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fuse structure with dual-element protection and time-delay performance, characterized in that: include: tube body(10); Contact terminals (20) are arranged at two ends of the tube body (10) and respectively abut against the tube body (10); A sleeve member (30) is provided with a through hole (31) opposite to the contact terminal (20), wherein the sleeve member (30) passes through the contact terminal (20) through the through hole (31) and is sleeved on the tube body (10), and forms a sealed arc extinguishing cavity (11) with the inner cavity of the tube body (10) for accommodating arc extinguishing sand; A connection assembly (40) located in the arc extinguishing chamber (11) and comprising a first connection plate (41) and a second connection plate (42) arranged opposite to each other; an overload protection component (50) located in the arc extinguishing chamber (11), with two ends respectively connected to the first connection plate (41) and the second connection plate (42), wherein the overload protection component (50) and the second connection plate (42) are connected via solder with a low melting point and fuse at high temperature; A plurality of melt elements (60) are located in the arc extinguishing chamber (11) and are respectively connected between the first connecting plate (41) and the contact terminal (20) at one end, and between the second connecting plate (42) and the contact terminal (20) at the other end.

2. The fuse structure according to claim 1, characterized in that: The overload protection assembly (50) comprises: a fixing member (51), an outer sleeve member (52), a support member (53), an elastic member (54) and a movable core (55) which are nested in sequence; one end of the movable core (55) is sleeved on and compresses the elastic member (54) and then passes through the support member (53) to be exposed in sequence to the outer sleeve member (52) and the fixing member (51) so as to be connected to the second connecting member through soldering; the fixing member (51) is provided with a first through hole (511), the outer sleeve member (52) is provided with a second through hole (521), the support member (53) is provided with a third through hole (531), and one end of the fixing member (51) away from the second connecting member is connected to the first connecting plate (41).

3. The fuse structure according to claim 2, characterized in that: The end of the movable core (55) away from the second connecting plate (42) is provided with a convex edge (551) for resisting the elastic member (54).

4. The fuse structure according to claim 3, characterized in that: The end of the movable core (55) away from the convex edge (551) is in the shape of a frustum, and the end with a smaller cross-sectional area is closer to the second connecting plate (42).

5. The fuse structure according to claim 2, characterized in that: One end of the fixing member (51) connected to the first connecting plate (41) is a symmetrical bending structure.

6. The fuse structure according to claim 1, characterized in that: When the conduction current is 1-60A, the thickness of the connecting plate is ≤0.8mm; When the conduction current is 61-100A, the thickness of the connecting plate is 0.8-1.0mm; When the conduction current is 110A-200A, the thickness of the connecting plate is 1-1.5mm; When the conduction current is 200A-400A, the thickness of the connecting plate is 1.5-2.5mm; When the conduction current is greater than 400A, the thickness of the connecting plate is 2.5-3.0mm.

7. The fuse structure according to claim 1, characterized in that: Two of the melt elements (60) are respectively arranged between the first connecting plate (41), the second connecting plate (42) and the contact terminals (20) at both ends.

8. The fuse structure according to claim 1, characterized in that: An identification groove (21) is provided on one of the contact terminals (20).

9. The fuse structure according to claim 2, characterized in that: The contact terminal (20), the sleeve member (30), the first connection plate (41), the second connection plate (42), the fixing member (51), the support member (53) and the movable core (55) are all made of copper; the outer sleeve member (52) is made of insulating material; and the tube body (10) is a melamine tube.

10. The fuse structure according to claim 1, characterized in that: Both ends of the melt element (60) are bent structures.

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