A high-voltage miniaturized fuse

Abstract

This utility model relates to the technical field of fuses and discloses a high-voltage miniaturized fuse, comprising: a fuse element assembly, the fuse element assembly including an insulating shell, a fuse receiving cavity inside the insulating shell, a plurality of fuse elements arranged in an array inside the fuse receiving cavity, the fuse element assembly including a fuse piece, a plurality of arched current limiting parts protruding from the outer side of the fuse piece, and a plurality of arc-extinguishing adhesives on the fuse piece, the arched current limiting parts being arranged opposite to the arc-extinguishing adhesives, the fuse piece being connected to the inner wall of the insulating shell through the arc-extinguishing adhesives for arc extinguishing and insulation; this utility model, by arranging the fuse elements in a ring array and having the arched current limiting parts on the fuse pieces protruding towards the center of the insulating shell, enables a more uniform current distribution in each group of fuse elements.

Description

Technical Field

[0001] This utility model belongs to the technical field of fuses, and more specifically, it relates to a high-voltage miniaturized fuse. Background Technology

[0002] Currently, the high-voltage electrical platforms for new energy vehicles are developing rapidly, and the demand for automotive-grade fuses to be miniaturized, high-voltage, highly safe, and long-life is continuously increasing. The industry generally requires fuses to achieve a significant increase in voltage level while maintaining the original installation dimensions and structural compatibility, in order to meet the usage requirements of the next generation of automotive high-voltage systems. However, with the continuous increase in operating voltage, the arc energy generated when a short circuit or overload occurs in the circuit increases exponentially, placing more stringent technical requirements on the arc-extinguishing capability, housing heat resistance, structural stability, and overall protection performance of the fuse. Traditional fuses are no longer suitable for such high-voltage operating conditions.

[0003] Existing vehicle-mounted fuses generally suffer from structural design flaws. The distance between the arched portion of the fuse wire and the inner wall of the insulating shell is too small. Under the action of short-circuit current, the high-temperature arc can directly impact and burn the insulating shell, causing it to rapidly crack under the instantaneous high temperature within milliseconds. The arc can then propagate outward from the damaged area, igniting surrounding electrical components and expanding the scope of the safety accident, seriously threatening the operational safety of the vehicle's high-voltage system. Furthermore, traditional fuses often use a centralized arrangement of fuse wires, resulting in uneven current distribution and heat concentration in localized areas. This fails to fully utilize the heat dissipation area, leading to higher operating temperatures, shorter lifespans, and difficulties in achieving miniaturization and compact design. In addition, traditional fuses have a single arc-extinguishing method, insufficient post-break insulation capacity, a high risk of arc reignition, weak breaking speed and current-limiting performance, and generally low withstand voltage ratings. They cannot be upgraded to higher voltage levels within limited spaces, and their protection range and accuracy are limited, failing to meet the comprehensive requirements of high reliability, high safety, miniaturization, and high-voltage adaptability for high-voltage electrical systems in new energy vehicles.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings to provide a high-voltage miniaturized fuse, in order to achieve a more practical and valuable purpose. Utility Model Content

[0005] This invention provides a high-voltage miniaturized fuse to overcome the aforementioned defects in the prior art.

[0006] The purpose and effect of this utility model of a high-voltage miniaturized fuse are achieved by the following specific technical means:

[0007] A high-voltage miniaturized fuse includes a fuse element assembly, the fuse element assembly including an insulating shell, the insulating shell having a fuse element receiving cavity inside, and a plurality of fuse element assemblies arranged in an array within the fuse element receiving cavity;

[0008] The melt assembly includes a melt sheet, which has several arched current-limiting parts protruding toward the center of the insulating shell, and several arc-quenching adhesives are provided on the melt sheet.

[0009] The arched current-limiting part is arranged opposite to the arc-extinguishing adhesive. The fusible element is connected to the inner wall of the insulating shell through the arc-extinguishing adhesive to achieve arc-extinguishing and insulation cooperation. The arched current-limiting part and the arc-extinguishing adhesive cooperate to shorten the overall length of the fuse, extend the arc path and improve the insulation capability after the break.

[0010] In a further technical solution, the melt components are arranged in a ring array, with gaps between adjacent sets of melt components.

[0011] In a further technical solution, the melt sheet is a long strip-shaped conductive structure that extends vertically, with lead-out end pieces integrally formed at its upper and lower ends, and the lead-out end pieces having a horizontally bent sheet-like structure.

[0012] In a further technical solution, two sets of fusing holes are provided between two adjacent sets of arched flow limiting parts on the melt sheet, and a flow limiting groove is provided between the two sets of fusing holes.

[0013] A further technical solution is that the main body segment of the melt sheet is arranged with three sets of arched current limiting parts in a vertical array, each set of arched current limiting parts including two symmetrical grooves; the arc extinguishing adhesive is disposed on the side plane of the melt sheet away from the arched current limiting parts, wherein the internal grooves of the set of arched current limiting parts corresponding to the upper and lower ends are filled with arc extinguishing adhesive, while the internal grooves of the set of arched current limiting parts corresponding to the middle set are not filled with arc extinguishing adhesive, and arc extinguishing adhesive is also disposed between the arched current limiting parts at the upper and lower ends and the lead-out end piece.

[0014] In a further technical solution, the molten cavity of the insulating shell is fully filled with quartz sand.

[0015] In a further technical solution, the arc-quenching adhesive is any one of 703 silicone, 704 silicone, or 5088 silicone.

[0016] In a further technical solution, an upper cover is fixedly connected to the upper end of the insulating shell, and an upper connector is fixedly connected to the upper end of the upper cover.

[0017] In a further technical solution, a lower end cover is fixedly connected to the lower end of the insulating shell, and a lower connector is fixedly connected to the lower end of the lower end cover.

[0018] In a further technical solution, the lead-out end piece is flatly fixed to the outside of the upper and lower end covers. The bending direction of the lead-out end piece is consistent with the coating plane of the arc-extinguishing adhesive and opposite to the protruding direction of the arched current-limiting part, so that the arched current-limiting part is arranged towards the center of the insulating shell.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model discloses a high-voltage miniaturized fuse that breaks through the limitations of traditional designs with two sets of four arch heights and two sets of adhesive. It features three sets of arch-height current-limiting sections arranged vertically in the main body of the fuse element, each set containing two symmetrical grooves, forming a six-groove, three-arch height layout. Furthermore, it employs differentiated and precise filling of the arc-extinguishing adhesive: the grooves at both the upper and lower current-limiting sections are filled with arc-extinguishing adhesive, while the groove in the middle current-limiting section is left unfilled. An additional arc-extinguishing adhesive is added between the upper and lower current-limiting sections and the lead-out terminals. This design allows the arc-extinguishing adhesive to precisely act on the critical melting area, rapidly forming a high-insulation isolation layer when the fuse element melts. This significantly expands the arc-extinguishing and insulation coverage, enhances the arc-extinguishing, heat insulation, and insulation effects at critical melting points, effectively suppresses arc extension, reignition, and leakage, improves current-limiting speed and breaking capacity, and greatly enhances the fuse's high-voltage adaptability, structural compactness, operational stability, and long-term reliability.

[0021] This utility model discloses a miniaturized high-voltage fuse. Two grooves in each of the upper and lower arched current-limiting sections are filled with arc-extinguishing adhesive, while the two grooves in the middle arched current-limiting section remain unfilled. Combined with additional arc-extinguishing adhesive between the upper and lower arched current-limiting sections and the lead-out terminals, this design ensures insulation and arc extinguishing at critical locations while cleverly preventing excess adhesive from covering the normal conduction area of ​​the fuse element. This effectively prevents adhesive adhesion and accumulation, which can lead to decreased conductivity and slower fuse response. It perfectly balances high-voltage compatibility with structural design rationality. Compared to traditional designs with only two sets of adhesive and four arches, this utility model features a layout of three arches and six grooves. Combined with differentiated adhesive filling and adhesive placement at the lead-out terminals, this allows for more even current distribution on the fuse element, effectively preventing localized heat concentration, significantly extending the arc path, increasing electrical clearance, and significantly improving withstand voltage without increasing device size, thus adapting to high-voltage operating conditions.

[0022] This utility model discloses a high-voltage miniaturized fuse. By ensuring that the direction of the arc-extinguishing adhesive is consistent with the orientation of the lead-out end piece, and that the adhesive is only filled at the key melting positions and joints at the top and bottom ends, the robotic arm can accurately clamp the lead-out end piece during automated assembly. This prevents the arc-extinguishing adhesive from being touched or scratched, thus avoiding damage to the adhesive and affecting the arc-extinguishing performance. At the same time, it improves the efficiency and consistency of automated assembly and is suitable for large-scale mass production. More importantly, this design, through the layout of three sets of arch heights and six sets of grooves, combined with differentiated adhesive filling and the orientation design of the lead-out terminals, effectively solves the core pain points of traditional fuses: poor high-voltage adaptability, cumbersome assembly, and unstable operation. It ensures that the fuse element responds quickly and accurately to its protective function upon melting, significantly improving post-break insulation performance, preventing arcing and breakdown of the insulating shell, and further enhancing overall protection performance. This ensures that the equipment can still stably perform short-circuit and overload protection under complex high-voltage conditions such as vehicle-mounted applications, precisely meeting the core requirements of vehicle-mounted high-voltage usage scenarios. This provides a solid foundation for the stable high-voltage operation of fuses, significantly improving the product's practicality, stability, and market competitiveness. The benefits can be summarized in three sections. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall appearance structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the overall front view of the present invention;

[0027] Figure 3 This is a schematic diagram of the overall appearance structure of the fuse assembly in this utility model;

[0028] Figure 4 This is a top view of the overall structure of the fuse assembly in this utility model;

[0029] Figure 5 This is a schematic diagram of the overall exploded structure of the fuse assembly in this utility model;

[0030] Figure 6 This is a schematic diagram of the overall exploded frontal cross-sectional structure of the fuse assembly in this utility model;

[0031] Figure 7 This is a schematic diagram of the overall first appearance structure of the melt assembly in this utility model;

[0032] Figure 8 This is a schematic diagram of the overall second appearance structure of the melt assembly in this utility model;

[0033] Figure 9 This is a schematic diagram of the overall front view of the melt assembly in this utility model;

[0034] Figure 10 This is a side view of the overall structure of the melt assembly in this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Fuse assembly; 11. Insulating housing; 12. Upper end cover; 13. Lower end cover; 14. Upper connector; 15. Lower connector; 16. Fuse receiving cavity;

[0037] 2. Melt assembly; 21. Melt sheet; 22. Arc extinguishing adhesive; 23. Fusible hole; 24. Flow limiting groove; 25. Lead-out end piece; 26. Arched flow limiting section. Detailed Implementation

[0038] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0039] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] As attached Figure 1 To be continued Figure 10 As shown:

[0042] This utility model provides a high-voltage miniaturized fuse, including a fuse element assembly 1. The fuse element assembly 1 includes an insulating shell 11. The insulating shell 11 has a fuse receiving cavity 16 inside, and a plurality of fuse elements 2 are arranged in an array inside the fuse receiving cavity 16.

[0043] The melt assembly 2 includes a melt sheet 21, which has several sets of arched current limiting parts 26 protruding toward the center of the insulating shell 11, and several sets of arc extinguishing adhesive 22 are also provided on the melt sheet 21.

[0044] The arched current limiting part 26 is arranged opposite to the arc extinguishing adhesive 22. The fusible element 21 is connected to the inner wall of the insulating shell 11 through the arc extinguishing adhesive 22 and performs arc extinguishing insulation. The arched current limiting part 26, together with the arc extinguishing adhesive 22, can shorten the overall length of the fuse, extend the arc combustion path, establish high voltage insulation capability, improve the withstand voltage capability of the fuse under the same external size, realize the miniaturization and high voltage design of the fuse, and at the same time increase the amount of metal required for arc combustion, improve the arc extinguishing speed and post-break insulation performance, effectively solve the problem that traditional fuses are difficult to balance high voltage adaptability and miniaturization, adapt to scenarios with limited installation space and high high voltage performance requirements such as vehicle-mounted applications, and ensure the structural stability and insulation reliability of the device under high voltage conditions.

[0045] Preferred options are shown in the appendix. Figure 3 To be continued Figure 4 The melt components 2 are arranged in a ring array with gaps between adjacent sets of melt components 2. The ring-shaped uniform arrangement can make the current distribution more uniform, avoid local heat concentration, maximize the heat dissipation area and heat dissipation efficiency, reduce the product's operating temperature rise, improve the product's service life and operating stability, and at the same time provide sufficient filling space for the arc extinguishing medium such as quartz sand, ensuring that the arc extinguishing medium can uniformly wrap the melt components, improve the uniformity and effectiveness of arc extinguishing, further enhance the device's breaking capacity, and meet the requirements of long-term stable operation of vehicle-mounted high-voltage systems.

[0046] Preferred options are shown in the appendix. Figure 7 To be continued Figure 10 The melt assembly 2 includes a melt sheet 21, and both the upper and lower ends of the melt sheet 21 are fixedly connected with lead-out end pieces 25 to ensure stable current transmission, improve the reliability and conductivity stability of the connection between the melt assembly and the end cap, reduce contact resistance, reduce product heating, avoid local overheating damage due to poor contact or excessive resistance, and at the same time improve the conductivity efficiency of the device to ensure smooth current transmission in the vehicle high-voltage system and meet automotive-grade conductivity requirements.

[0047] Preferred options are shown in the appendix. Figure 7 To be continued Figure 10 On the fusible element 21, two sets of fuse holes 23 are provided between two adjacent sets of arched current limiting parts 26, and a current limiting groove 24 is provided between the two sets of fuse holes 23. The fuse holes 23 are used to reduce the cross-sectional area of ​​the fusible element to form a narrow neck, ensuring accurate melting during overload and short circuit, avoiding the influence of melting position deviation on the breaking effect, and improving the accuracy of device protection. The current limiting groove 24 is used to further divide the arc, dividing the long arc into multiple short arcs, increasing the arc voltage, and achieving rapid arc extinguishing in conjunction with the arc extinguishing medium, improving the breaking capacity and current limiting performance of the fuse, enabling rapid interruption of fault current, preventing fault expansion, and protecting the vehicle high-voltage system and surrounding components.

[0048] Preferred options are shown in the appendix. Figure 7 To be continued Figure 10 The arc-extinguishing adhesive 22 is disposed on the side of the fusible element 21 away from the arched current-limiting part 26. The fusible element 21 has a total of six arched current-limiting parts 26, of which the two arched current-limiting parts 26 at the top and bottom ends are filled with arc-extinguishing adhesive 22, while the two arched current-limiting parts 26 in the middle are not filled with arc-extinguishing adhesive 22. The arc-extinguishing adhesive 22 is applied to the melting position of the fusible element 21, which can quickly form a high-insulation isolation layer after the fusible element 21 melts, effectively improving the insulation performance after the break, preventing arc reignition, and preventing secondary faults. At the same time, the coating method on the same plane facilitates automated gripping and assembly, improves production efficiency and product consistency, reduces production errors, further ensures the high-voltage adaptability and operational stability of the fuse, and meets the consistency requirements of mass production and automotive-grade products.

[0049] Preferred options are shown in the appendix. Figure 3 To be continued Figure 4 The insulating shell 11 is filled with quartz sand, which completely fills the melt receiving cavity 16. The quartz sand can rapidly cool, divide, and compress the electric arc, quickly absorb the arc energy, reduce the thermal shock of the arc to the insulating shell, prevent the insulating shell from cracking due to instantaneous high temperature, prevent the arc from spraying out and damaging surrounding components, enhance the arc extinguishing effect, shorten the arc extinguishing time, improve the safety and reliability of the product, adapt to the extreme working conditions when the vehicle high voltage system fails, and provide dual arc extinguishing protection for the device.

[0050] Preferred options are shown in the appendix. Figure 8 To be continued Figure 9 The arc-extinguishing adhesive 22 is made of any one of 703 silicone, 704 silicone, or 5088 silicone. This type of silicone has excellent high temperature resistance, insulation, and bonding stability. It can maintain structural integrity under high arc temperature, without melting or failure, effectively improving the arc extinguishing effect and post-break insulation capability. At the same time, it can firmly bond the molten sheet to the inner wall of the insulating shell, preventing the molten sheet from loosening in a vibration environment. It is suitable for the vibration conditions of the vehicle platform, ensuring long-term stable operation of the device and meeting the requirements of automotive-grade high temperature resistance and vibration resistance.

[0051] Preferred options are shown in the appendix. Figure 1 To be continued Figure 3 The upper end of the insulating shell 11 is fixedly connected to the upper end cover 12, and the upper end of the upper end cover 12 is fixedly connected to the upper connector 14, so as to achieve the sealing of the upper end of the insulating shell, prevent the leakage of quartz sand and the entry of external impurities, ensure the stability of the internal arc extinguishing environment, and at the same time ensure a stable and reliable connection with the external circuit, reduce contact resistance, avoid heat generation at the contact point, and meet the sealing and conductivity requirements of the vehicle high voltage system.

[0052] Preferred options are shown in the appendix. Figure 1 To be continued Figure 3 The lower end of the insulating shell 11 is fixedly connected to a lower end cover 13, and the lower end of the lower end cover 13 is fixedly connected to a lower connector 15, thereby sealing the lower end of the insulating shell. Together with the upper end cover, they form a complete sealing structure, further ensuring the stability of the internal arc-extinguishing medium and melt assembly, preventing the intrusion of external moisture and impurities, while ensuring a stable and reliable connection with the external circuit, ensuring smooth bidirectional current transmission, and improving the overall sealing performance and connection reliability of the device.

[0053] Preferred options are shown in the appendix. Figure 5 The lead-out end piece 25 is flatly fixed to the outside of the upper end cover 12 and the lower end cover 13. The orientation of the lead-out end piece 25 is opposite to the protruding direction of the arched current limiting part 26, so that the arched current limiting part 26 is arranged facing the center of the insulating shell 11, thereby keeping the arched current limiting part 26 away from the inner wall of the insulating shell 11, effectively increasing the electrical clearance, reducing the impact of the electric arc on the insulating shell 11, and preventing the electric arc from breaking down the insulating shell 11. At the same time, the flat fixing method ensures a firm connection and reliable contact, improves the overall structural strength and conductivity stability of the product, and ensures that the product can still work stably in the vehicle vibration environment, meeting the automotive-grade vibration adaptation requirements.

[0054] Specific usage method of this utility model:

[0055] When using this device, first align the fuse with the corresponding installation position on the vehicle platform via the upper connector 14 and the lower connector, and install it in the designated position on the vehicle platform. Then, use bolts to fix it to the vehicle electrical platform to ensure that the connection is firm and secure, meeting the automotive-grade installation requirements. At the same time, the sealing effect of the upper end cover 12 and the lower end cover 13 is used to prevent the leakage of quartz sand, external moisture and impurities during installation, ensuring the integrity of the internal structure of the device and laying the foundation for subsequent high-voltage stable operation. When the vehicle-mounted high-voltage platform starts working, this fuse simultaneously enters the high-voltage working state. The current is transmitted to the fuse element 21 through the upper connector 14, upper end cover 12, and lead-out end piece 25, and then output through the lower end cover 13 and lower connector 15, realizing stable current transmission. As the voltage of the vehicle-mounted high-voltage system increases, the arc energy increases exponentially, which puts forward higher requirements for the structural stability and insulation performance of the fuse. This device can work stably under this high-voltage condition through the coordinated cooperation of the arched current limiting part 26 and the arc extinguishing adhesive 22, fully meeting the requirements of automotive-grade high-voltage use. At the same time, through the compact structural design, it adapts to the installation space limitations of the vehicle-mounted platform without occupying too much additional installation area, achieving the dual advantages of miniaturization and high-voltage adaptability, providing basic structural support and reliable circuit protection for the vehicle-mounted high-voltage system.

[0056] When the vehicle-mounted high-voltage system where this device is located experiences a short circuit or overload fault, the short circuit current in the circuit increases instantaneously. The melt sheet 21 in the melt assembly 2 is in a high-temperature and high-pressure working environment. Since the melt assembly 2 adopts a ring array arrangement, the current can be evenly distributed in each group of melt assemblies 2, effectively avoiding local overheating, greatly improving the overall heat dissipation efficiency and working stability, and preventing the device from being damaged or disconnected prematurely due to local overheating. At this time, the current passes through the arched current limiting part 26. Its protruding structure facing the center of the insulating shell 11 can effectively extend the arc burning path without increasing the overall volume of the fuse. With the help of the arc extinguishing adhesive 22 (made of any one of 703 silicone, 704 silicone or 5088 organic silicone, with excellent high temperature resistance and insulation properties), the arc extinguishing adhesive 22 is rapidly heated to form a high insulation isolation layer at the moment the fusible element 21 melts, effectively preventing the arc from reigniting. At the same time, it greatly improves the insulation capability after the break, ensures the insulation reliability of the fuse break point, prevents the arc from damaging the insulating shell 11, and structurally ensures the operational safety of the vehicle high voltage system and avoids the expansion of the fault.

[0057] Through the synergistic effect of the fusing hole 23 and the current-limiting groove 24, the fusing position of the fusible element 21 can be precisely located. The fusing hole 23 reduces the cross-sectional area of ​​the fusible element to form a narrow neck, allowing the fusible element 21 to precisely fuse at a preset position during overload or short circuit, avoiding deviation in the fusing position from affecting the breaking effect and improving the accuracy of the device protection. The current-limiting groove 24 further divides the arc, splitting the long arc into multiple short arcs, effectively increasing the arc voltage. Combined with the arc-extinguishing adhesive 22, this accelerates the arc extinguishing. At the same time, the quartz sand fully filled inside the insulating shell 11 can quickly absorb the arc energy, cool, divide, and compress the arc, further shortening the arc extinguishing time, reducing the thermal shock of the arc to the insulating shell 11, preventing the shell from cracking due to instantaneous high temperature, and preventing arc leakage from damaging surrounding components. This forms a triple arc-extinguishing protection of "current-limiting groove + arc-extinguishing adhesive + quartz sand", significantly improving the breaking capacity and operational safety of the device. Furthermore, the arc-extinguishing adhesive 22 employs a uniform planar coating method, and its reasonable layout—with the upper and lower arched current-limiting sections 26 filled internally and the middle section unfilled—ensures effective arc extinguishing while facilitating automated gripping and assembly, improving production efficiency and product consistency, and reducing production errors. The lead-out end piece 25 is flatly fixed to the outside of the end cover, with its orientation opposite to the protruding direction of the arched current-limiting section 26. This increases the electrical clearance, preventing arc penetration of the insulating shell, and ensures a robust connection, guaranteeing stable operation of the device even under vehicle vibration environments. The overall structure works synergistically to achieve a unified approach to high-voltage adaptation, miniaturized layout, and high-reliability protection, significantly superior to traditional fuse structures. It fully adapts to the usage requirements of vehicle high-voltage systems, providing comprehensive and highly reliable short-circuit and overload protection for vehicle high-voltage circuits.

[0058] This utility model discloses a high-voltage miniaturized fuse that breaks through the limitations of traditional designs with two sets of four arch heights and two sets of adhesive. It features three sets of arch-height current-limiting sections 26 arranged vertically in the main body of the fuse element 21, each containing two symmetrical grooves, forming a six-groove, three-arch height layout. Furthermore, it employs differentiated and precise filling of the arc-extinguishing adhesive 22: the grooves at both the upper and lower current-limiting sections are filled with arc-extinguishing adhesive, while the groove in the middle current-limiting section is left unfilled. Additionally, arc-extinguishing adhesive is added between the upper and lower current-limiting sections and the lead-out end piece 25. This design allows the arc-extinguishing adhesive to precisely act on the critical melting area, rapidly forming a high-insulation isolation layer when the fuse melts. This significantly expands the arc-extinguishing and insulation coverage, enhances the arc-extinguishing, heat insulation, and insulation effects at critical melting points, effectively suppresses arc extension, reignition, and leakage, improves current-limiting speed and breaking capacity, and greatly enhances the fuse's high-voltage adaptability, structural compactness, operational stability, and long-term reliability.

[0059] This utility model discloses a miniaturized high-voltage fuse. Two grooves in each of the upper and lower arched current-limiting sections 26 are filled with arc-extinguishing adhesive 22, while the two grooves in the middle arched current-limiting section 26 remain unfilled. Combined with the additional arc-extinguishing adhesive 22 between the upper and lower arched current-limiting sections 26 and the lead-out end piece 25, this design ensures insulation and arc extinguishing effects at critical locations while cleverly preventing excess adhesive from covering the normal conduction area of ​​the fuse element 21. This effectively prevents adhesive adhesion and accumulation, which can lead to decreased conductivity and slower fuse response speed. It perfectly balances high-voltage compatibility with structural design rationality. Compared to traditional designs with only two sets of adhesive and four arches, this utility model's layout of three arches and six grooves, along with differentiated adhesive filling and adhesive placement at the lead-out end connection, allows for more uniform current distribution on the fuse element 21. This effectively avoids localized heat concentration, significantly extends the arc path, increases electrical clearance, and significantly improves withstand voltage without increasing device size, thus adapting to high-voltage operating conditions.

[0060] This utility model discloses a high-voltage miniaturized fuse. Because the pasting direction of the arc-extinguishing adhesive 22 is consistent with the orientation of the lead-out end piece 25, and the adhesive is only filled at the key melting positions and joints at the upper and lower ends, the robotic arm can accurately clamp the lead-out end piece 25 during automated assembly. It is not easy to touch or scratch the arc-extinguishing adhesive 22, thus avoiding damage to the adhesive and affecting the arc-extinguishing performance. At the same time, it improves the efficiency and consistency of automated assembly and is suitable for the needs of large-scale mass production. More importantly, this design, through the layout of three sets of arch heights and six sets of grooves, combined with differentiated adhesive filling and the orientation design of the lead-out end piece 25, effectively solves the core pain points of traditional fuses: poor high-voltage adaptability, cumbersome assembly, and unstable operation. It ensures that the fuse element 21 responds quickly and accurately to its protective function upon melting, significantly improving post-break insulation performance, preventing arcing and breakdown of the insulation shell, and further enhancing overall protection performance. This ensures that the equipment can still stably perform short-circuit and overload protection under complex high-voltage conditions such as vehicle-mounted applications, precisely meeting the core requirements of vehicle-mounted high-voltage usage scenarios. This provides a solid foundation for the stable high-voltage operation of fuses, significantly improving the product's practicality, stability, and market competitiveness. The benefits can be summarized in three sections.

[0061] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A high voltage miniaturized fuse, characterized in that: It includes a fuse assembly (1), the fuse assembly (1) includes an insulating shell (11), the insulating shell (11) has a melt receiving cavity (16) inside, and a plurality of melt assemblies (2) are arranged in an array inside the melt receiving cavity (16). The melt assembly (2) includes a melt sheet (21), which has several arched current limiting parts (26) protruding toward the center of the insulating shell (11), and several arc-extinguishing adhesives (22) are provided on the melt sheet (21). The arched current limiting part (26) is arranged opposite to the arc extinguishing adhesive (22). The fusible element (21) is connected to the inner wall of the insulating shell (11) through the arc extinguishing adhesive (22) to achieve arc extinguishing and insulation cooperation. The arched current limiting part (26) and the arc extinguishing adhesive (22) cooperate with each other to shorten the overall length of the fuse, extend the arc path and improve the insulation capability after the break.

2. A high voltage miniaturized fuse according to claim 1, characterized in that: The melt components (2) are arranged in a ring array, with gaps between adjacent sets of melt components (2).

3. A high voltage miniaturized fuse according to claim 2, characterized in that: The melt sheet (21) is a long strip-shaped conductive structure that extends vertically, and its upper and lower ends are integrally formed with lead-out end pieces (25), which are horizontally bent sheet-like structures.

4. A high voltage miniaturized fuse according to claim 3, characterized in that: On the melt sheet (21), there are two sets of fuse holes (23) between two adjacent sets of arched flow limiting parts (26), and a flow limiting groove (24) is provided between the two sets of fuse holes (23).

5. A high-voltage miniaturized fuse according to claim 4, characterized in that: The main body of the melt sheet (21) is arranged with three sets of arched current limiting parts (26) in a vertical array. Each set of arched current limiting parts (26) includes two symmetrical grooves. The arc extinguishing adhesive (22) is disposed on the side plane of the melt sheet (21) away from the arched current limiting parts (26). The internal grooves of the set of arched current limiting parts (26) at the upper and lower ends are filled with arc extinguishing adhesive (22), while the internal grooves of the set of arched current limiting parts (26) in the middle are not filled with arc extinguishing adhesive (22). Arc extinguishing adhesive (22) is also provided between the arched current limiting parts (26) at the upper and lower ends and the lead-out end piece (25).

6. A high voltage miniaturized fuse according to claim 1, characterized in that: The melt containment cavity (16) of the insulating shell (11) is fully filled with quartz sand.

7. A high voltage miniaturized fuse according to claim 1, characterized in that: The upper end of the insulating shell (11) is fixedly connected to the upper end cover (12), and the upper end of the upper end cover (12) is fixedly connected to the upper connector (14).

8. A high voltage miniaturized fuse according to claim 1, characterized in that: The lower end of the insulating shell (11) is fixedly connected to a lower end cover (13), and the lower end of the lower end cover (13) is fixedly connected to a lower connector (15).

9. A high voltage miniaturized fuse according to claim 5, characterized in that: The lead-out end piece (25) is flatly fixed to the outside of the upper end cover (12) and the lower end cover (13). The bending direction of the lead-out end piece (25) is consistent with the coating plane of the arc-extinguishing adhesive (22) and opposite to the protrusion direction of the arched current limiting part (26), so that the arched current limiting part (26) is arranged towards the center of the insulating shell (11).

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