Fusible cut-out

Abstract

The application discloses a fuse, relates to the technical field of overcurrent protection, and aims to solve the problem that the temperature rise of a conductive row is too high when a fuse body is fused in the prior art. The fuse provided by the application comprises a shell, the shell is internally provided with a first heat conduction area, a second heat conduction area and a third heat conduction area which are independent of each other, the third heat conduction area is located between the first heat conduction area and the second heat conduction area, a fuse body is arranged in the third heat conduction area, one of two conductive rows is extended into the first heat conduction area from the outside of the shell and is electrically connected with one end of the fuse body, and the other conductive row is extended into the second heat conduction area from the outside of the shell and is electrically connected with the other end of the fuse body, wherein the heat conduction efficiency of the first heat conduction area and the heat conduction efficiency of the second heat conduction area are both higher than the heat conduction efficiency of the third heat conduction area. By pulling apart the temperature rise difference between the fuse body and the conductive row, the application can avoid the temperature rise of the conductive row from being too high due to the high temperature of the fuse body when the fuse body is fused to a certain extent.

Description

Technical Field

[0001] This application relates to the field of overcurrent protection technology, specifically to a fuse. Background Technology

[0002] A fuse is an electrical device used to connect, carry, and disconnect circuits. A fuse typically consists of a fusible element and a conductor busbar. Under normal operating current, the fusible element's temperature remains within a safe range, and the circuit remains conductive. When an overload or short circuit occurs in the circuit, and the current exceeds the fusible element's rated value, the fusible element rapidly heats up due to the Joule heating effect. When the temperature reaches the fusible element's melting point (M-effect point), the fusible element melts, the circuit is disconnected, and the fuse provides protection.

[0003] However, as fuses are developed towards smaller size and higher current density, traditional designs often experience excessive temperature rise in the busbar connected to the fusible element during the melting process due to high temperatures. Excessive temperature rise in the busbar accelerates electromigration in the busbar material, leading to connection failure or irreversible degradation of electrical performance. Utility Model Content

[0004] This application provides a fuse that can solve the problem that the temperature rise of the conductor bar will exceed the standard when the fusible element of the existing fuse melts.

[0005] To achieve the above objectives, the fuse provided in this application includes:

[0006] The housing has three independent heat-conducting zones: a first heat-conducting zone, a second heat-conducting zone, and a third heat-conducting zone, with the third heat-conducting zone located between the first and second heat-conducting zones.

[0007] The melt is located within the third heat-conducting zone;

[0008] Two conductive bars are provided. One conductive bar extends from the outside of the shell into the first heat-conducting zone and is electrically connected to one end of the melt. The other conductive bar extends from the outside of the shell into the second heat-conducting zone and is electrically connected to the other end of the melt.

[0009] Among them, the thermal conductivity of the first thermal conduction zone and the thermal conductivity of the second thermal conduction zone are both higher than those of the third thermal conduction zone.

[0010] In some embodiments of this application, a first partition and a second partition are spaced apart inside the housing, a third heat-conducting area is located on the side opposite to the second partition, and a second heat-conducting area is located on the side of the second partition opposite to the first partition.

[0011] The thermal conductivity of both the first and second partitions is lower than that of the first or second thermally conductive zone.

[0012] In some embodiments of this application, a first heat-conducting medium is present in both the first and second heat-conducting regions, and a second heat-conducting medium is present in the third heat-conducting region. The heat conduction efficiency of the first heat-conducting medium is higher than that of the second heat-conducting medium.

[0013] In some embodiments of this application, the first and second heat-conducting regions each contain a first heat-conducting medium, and the third heat-conducting region is a vacuum region.

[0014] In some embodiments of this application, the first thermally conductive medium includes at least one of quartz sand and ceramics, and the second thermally conductive medium includes at least one of plastic particles, rubber particles, inert gas and aerogel.

[0015] In some embodiments of this application, the volume of the first heat-conducting zone and the volume of the second heat-conducting zone are both greater than the volume of the third heat-conducting zone.

[0016] In some embodiments of this application, the volume of the first heat-conducting region is equal to the volume of the second heat-conducting region.

[0017] In some embodiments of this application, the main body of one of the two conductive bars is located in the first heat-conducting zone and is electrically connected to one end of the melt, while the main body of the other conductive bar is located in the second heat-conducting zone and is electrically connected to the other end of the melt.

[0018] Each conductive busbar has a groove on its main body.

[0019] In some embodiments of this application, each conductive busbar has a first connecting portion connected to the main body, and each first connecting portion is located within the third heat-conducting zone;

[0020] The main body of one of the two conductive bars passes through the first partition and is electrically connected to one end of the melt through the first connecting part;

[0021] The main body of the other conductive busbar passes through the second partition and is electrically connected to the other end of the melt through the first connecting part.

[0022] In some embodiments of this application, the width of the main body portion is smaller than the width of the first connecting portion within the same conductive busbar.

[0023] In some embodiments of this application, each conductive busbar has a second connecting portion connected to the main body portion. The second connecting portion is disposed at the end of the main body portion away from the melt and extends at least partially outside the shell. In the same conductive busbar, the width of the main body portion is smaller than the width of the second connecting portion.

[0024] The above-mentioned technical solution of this application has at least the following beneficial effects:

[0025] In this technical solution, the first and second heat-conducting zones (the areas where the conductive busbar is located) have high thermal conductivity, which can quickly conduct the heat of the conductive busbar to the outside of the shell, avoiding local overheating. At the same time, the third heat-conducting zone (the area where the melt is located) has low thermal conductivity, which can effectively limit the heat generated by the melt from spreading to the surroundings, so that the heat generated by the melt is mainly concentrated in this area and will not spread rapidly to the conductive busbar. This effectively increases the temperature difference between the melt and the conductive busbar, reduces the thermal impact on the conductive busbar and the connection parts, and avoids problems such as softening, deformation or excessive temperature rise of the conductive busbar due to the high temperature when the melt breaks. In addition, it can suppress the material electromigration phenomenon caused by excessive temperature rise of the conductive busbar to a certain extent, effectively avoiding connection failure or irreversible degradation of electrical performance. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the fuse in one view according to an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the fuse housing in the embodiments of this application;

[0029] Figure 3 yes Figure 1 Cross-sectional view of section AA;

[0030] Figure 4 yes Figure 3 Enlarged view of part B in the image;

[0031] Figure 5 This is a schematic diagram of the conductor bar in the fuse in the embodiments of this application;

[0032] Figure 6 This is a schematic diagram of the fuse in the embodiment of this application from another perspective;

[0033] Figure 7 yes Figure 6 Cross-sectional view of section C.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Shell; 11-First heat-conducting zone; 12-Second heat-conducting zone; 13-Third heat-conducting zone; 14-First partition; 15-Second partition; 16-First end; 17-Second end; 18-Main body; 2-Melted material; 3-Conductive busbar; 31-Main body; 311-Groove; 32-First connecting part; 33-Second connecting part; 4-First heat-conducting medium; 5-Second heat-conducting medium. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] This application provides a fuse, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0041] A fuse is an electrical device used to connect, carry, and disconnect circuits. A fuse typically consists of a fusible element and a conductor busbar. Under normal operating current, the fusible element's temperature remains within a safe range, and the circuit remains conductive. When an overload or short circuit occurs in the circuit, and the current exceeds the fusible element's rated value, the fusible element rapidly heats up due to the Joule heating effect. When the temperature reaches the fusible element's melting point (M-effect point), the fusible element melts, the circuit is disconnected, and the fuse provides protection.

[0042] However, as fuses evolve towards smaller size and higher current density, traditional designs often experience excessive temperature rise in the busbars connected to the fusible element during the melting process due to high temperatures. Excessive temperature rise accelerates electromigration in the busbar material, leading to connection point failure or irreversible degradation of electrical performance. Simultaneously, excessive temperature rise also reduces the mechanical strength of the busbar material, potentially causing permanent deformation or softening, and in severe cases, busbar breakage or support structure failure, resulting in electrical short circuits or mechanical failures.

[0043] Therefore, this application provides a novel fuse that enables the fusible element to melt normally under overload, while also reducing the impact on the connected busbar to a certain extent, preventing the busbar temperature from becoming too high, thereby ensuring the safety and reliability of the entire fuse.

[0044] Please refer to Figures 1 to 4 The fuse includes a housing 1, a fusible element 2, and two conductive bars 3. The housing 1 contains three independent heat-conducting zones: a first heat-conducting zone 11, a second heat-conducting zone 12, and a third heat-conducting zone 13, located between the first and second heat-conducting zones 11 and 12. The fusible element 2 is disposed within the third heat-conducting zone 13. One of the two conductive bars 3 extends from the outside of the housing 1 into the first heat-conducting zone 11 and is electrically connected to one end of the fusible element 2. The other conductive bar 3 extends from the outside of the housing 1 into the second heat-conducting zone 12 and is electrically connected to the other end of the fusible element 2. The thermal conductivity of the first and second heat-conducting zones 11 is higher than that of the third heat-conducting zone 13.

[0045] In this technical solution, the first heat-conducting zone 11 and the second heat-conducting zone 12 (the area where the conductive busbar 3 is located) have high thermal conductivity, which can quickly conduct the heat of the conductive busbar 3 to the outside of the shell 1, avoiding local overheating. At the same time, the third heat-conducting zone 13 (the area where the melt 2 is located) has low thermal conductivity, which can effectively limit the heat generated by the melt 2 from spreading to the surrounding area, so that the heat generated by the melt 2 is mainly concentrated in this area and will not spread rapidly to the conductive busbar 3. This effectively increases the temperature rise difference between the melt 2 and the conductive busbar 3, reduces the thermal impact on the conductive busbar 3 and the connection parts, and avoids problems such as softening, deformation or excessive temperature rise of the conductive busbar 3 caused by the high temperature when the melt 2 melts. In addition, it can suppress the material electromigration phenomenon caused by excessive temperature rise of the conductive busbar 3 to a certain extent, effectively avoiding connection point failure or irreversible degradation of electrical performance.

[0046] Please continue to refer to Figure 2 In this embodiment, a first partition 14 and a second partition 15 are spaced apart inside the housing 1. A third heat-conducting zone 13 is located between the first partition 14 and the second partition 15. The first heat-conducting zone 11 is located on the side of the first partition 14 facing away from the second partition 15, and the second heat-conducting zone 12 is located on the side of the second partition 15 facing away from the first partition 14. The thermal conductivity of the first partition 14 and the second partition 15 is lower than that of the first heat-conducting zone 11 or the second heat-conducting zone 12. In other words, the first partition 14 and the second partition 15 act like two "heat-insulating walls." Because their thermal conductivity is lower than that of the first heat-conducting zone 11 and the second heat-conducting zone 12, they can effectively prevent the heat generated in the third heat-conducting zone 13 (the area where the melt 2 is located) from being rapidly transferred to the first heat-conducting zones 11 and 12 on both sides. This makes the temperature distribution in each area more independent and stable, avoiding heat interference between different areas and providing a more stable operating temperature environment for components such as the fuse element 2 and the busbar 3. At the same time, the first baffle 14 and the second baffle 15 can alleviate the thermal stress impact caused by rapid heat transfer, allowing the busbar 3 and connecting components to operate in a relatively stable temperature environment. This reduces the risk of component deformation, loosening, or damage caused by thermal stress, and improves the service life and reliability of the entire fuse.

[0047] For example, both the first partition 14 and the second partition 15 are made of heat-insulating material to better prevent the heat of the third heat-conducting zone 13 from being transferred to the first heat-conducting zone 11 and the second heat-conducting zone 12 through the first partition 14 and the second partition 15. This allows the high temperature generated by the melt 2 to be confined within the third heat-conducting zone 13, thereby more effectively widening the temperature difference between the melt 2 and the conductive busbar 3 and ensuring that the conductive busbar 3 can operate within a suitable temperature range.

[0048] In some embodiments, the thermal conductivity of the first heat-conducting region 11 and the second heat-conducting region 12 are equal. When the fuse is working, the heat generated by the conductive bars 3 connected to the first heat-conducting region 11 and the second heat-conducting region 12 can be conducted and dissipated simultaneously and evenly, avoiding the problem of excessive heat accumulation in one area and excessive heat dissipation in another area, thus making the temperature distribution of the entire fuse more uniform. Furthermore, since the thermal conductivity of the first heat-conducting region 11 and the second heat-conducting region 12 are equal, the temperature changes of the two conductive bars 3 connected to them are also relatively synchronized, thereby effectively reducing the fluctuation range of the contact resistance of the conductive bars 3 and ensuring the stability of current transmission. In designing the heat dissipation structure and selecting materials for the fuse, a unified standard and scheme can be adopted for the thermal conductivity of the first heat-conducting region 11 and the second heat-conducting region 12, reducing design complexity.

[0049] The following is a detailed description of specific embodiments in which the thermal conductivity of the first thermally conductive zone 11 and the thermal conductivity of the second thermally conductive zone 12 are both higher than the thermal conductivity of the third thermally conductive zone 13.

[0050] like Figure 3 As shown, in this embodiment, both the first heat-conducting zone 11 and the second heat-conducting zone 12 contain a first heat-conducting medium 4, and the third heat-conducting zone 13 contains a second heat-conducting medium 5. The thermal conductivity of the second heat-conducting medium 5 is lower than that of the first heat-conducting medium 4. Because the thermal conductivity of the second heat-conducting medium 5 is relatively low, it can effectively prevent the heat generated by the melt 2 from being rapidly transferred to the first heat-conducting zone 11 and the second heat-conducting zone 12, thereby achieving a good heat insulation effect, ensuring that the melt 2 can function within a suitable temperature range, and also preventing other components from being damaged due to overheating.

[0051] For example, the first heat-conducting medium 4 includes at least one of quartz sand and ceramics. Specifically, quartz sand or ceramic particles or blocks are filled in the first heat-conducting zone 11 and the second heat-conducting zone 12, which can quickly conduct the heat generated by the conductive busbar 3 to the wall of the shell 1 and then dissipate it to the external environment. This can accelerate the heat conduction speed from the conductive busbar 3 and other heat-generating parts to the surrounding environment, allowing the heat to dissipate more quickly and avoiding local overheating. Furthermore, quartz sand and ceramics are both good electrical insulators, which can effectively isolate current and avoid electrical faults caused by the conductivity of the heat-conducting medium. In addition, quartz sand and ceramic materials also have strong chemical stability and will not be damaged or have their thermal conductivity reduced due to reactions with chemical substances, thereby ensuring the long-term stable operation of the equipment. The second heat-conducting medium 5 includes at least one of plastic particles, rubber particles, inert gas, and aerogel. Furthermore, plastic particles, rubber particles, and aerogel are all good electrical insulators. Using these materials as heat-conducting media in the third heat-conducting zone 13 can prevent short-circuit accidents caused by leakage or other situations that may occur in the molten material 2.

[0052] In the case of inert gas in the third heat conduction zone 13, heat is concentrated in the third heat conduction zone 13, so that the fuse 2 can work in a suitable temperature environment, ensuring that the overload protection function of the fuse works normally. The inert gas has a certain fluidity and diffusion, and filling the third heat conduction zone 13 can make the heat more evenly distributed in the area, thereby reducing the material property changes and thermal stress problems caused by uneven temperature, and improving the stability of the internal temperature environment of the fuse.

[0053] In other embodiments, both the first heat-conducting zone 11 and the second heat-conducting zone 12 contain a first heat-conducting medium 4, and the third heat-conducting zone 13 is a vacuum zone. Specifically, heat transfer mainly occurs through three mechanisms: heat conduction, heat convection, and heat radiation. In the vacuum zone, the pathways for heat conduction and heat convection are blocked, leaving only heat radiation. This makes it difficult for the heat generated in the third heat-conducting zone 13 (the area where the melt 2 is located) to be transferred to the first heat-conducting zone 11 and the second heat-conducting zone 12, thus achieving a good thermal insulation effect. For example, the first heat-conducting medium 4 includes at least one of quartz sand and ceramics.

[0054] It should be noted that, in the embodiment where the first partition 14 and the second partition 15 are spaced apart inside the housing 1, and the third heat-conducting zone 13 is located between the first partition 14 and the second partition 15, the first partition 14 and the second partition 15 are provided with through holes for the corresponding conductive busbars 3 to pass through. Each conductive busbar 3 is passed through the through hole on the corresponding partition (first partition 14 or second partition 15), and an appropriate amount of sealant is applied between the conductive busbar 3 and the through hole, or a rubber sealing ring is installed to ensure a seal between the conductive busbar 3 and the partition. Simultaneously, the first partition 14 and the second partition 15 are installed inside the housing 1, and sealing material is also used to ensure a seal between them and the housing 1. An air extraction port connected to the third heat-conducting zone 13 is provided on the housing 1. This port can be connected to a vacuum pump through a pipe to ensure the airtightness of the air extraction port and prevent air leakage during the extraction process. Once the third heat conduction zone 13 reaches the required vacuum level, turn off the vacuum pump and quickly seal the evacuation port with sealing materials (such as welding, sealing nuts, etc.).

[0055] The first partition 14 and the second partition 15 are provided with through holes for the corresponding conductive busbars 3 to pass through. Each conductive busbar 3 passes through the through hole on the corresponding partition (first partition 14 or second partition 15) and is sealed to the partition. At the same time, the first partition 14 and the second partition 15 are also sealed to the housing 1.

[0056] For example, the first heat-conducting zone 11 and the second heat-conducting zone 12 are filled with quartz sand, the quartz sand having a thermal conductivity of 1 W / (m·K) to 2 W / (m·K) and a density of 1500 kg / m³.3 The specific heat capacity is 780 J / (kg·K). The third thermally conductive zone 13 is filled with air, which has a thermal conductivity of 0.026 W / (m·K) and a density of 1.1614 kg / m³. 3 With a specific heat capacity of 1005 J / (kg·K), different heat-conducting media are used to create a temperature gradient between the melt 2 and the conductive busbar 3. Comparative calculations were performed on the first heat-conducting zone 11 and the second heat-conducting zone 12 filled with either quartz sand or air. When the temperature of the melt 2 was adjusted to 106℃, the temperature of the conductive busbar 3 decreased by 3.7℃ to 4.5℃ when the first and second heat-conducting zones 11 and 12 were filled with quartz sand compared to when filled with air.

[0057] In some embodiments, the thermal conductivity of the first thermally conductive medium 4 can be 30 to 80 times that of the second thermally conductive medium 5, so that the first thermally conductive medium 4 and the second thermally conductive medium 5 have a high thermal conductivity difference, ensuring that heat is rapidly transferred from the conductive busbar 3 to the housing 1 and then dissipated into the environment, maintaining the temperature stability of the conductive busbar 3. At the same time, it ensures that the heat of the melt 2 is mainly concentrated in its own area, increasing the temperature rise difference between it and the conductive busbar 3.

[0058] For example, the thermal conductivity of the first heat-conducting medium 4 can be 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, or 80 times that of the second heat-conducting medium 5.

[0059] Please continue to refer to Figure 2 The volumes of the first heat-conducting zone 11 and the second heat-conducting zone 12 are both larger than the volume of the third heat-conducting zone 13. With this design, the larger volumes of the first and second heat-conducting zones 11 and 12 mean more space for arranging the heat dissipation structure or accommodating more heat dissipation medium. This larger space allows heat to gradually diffuse, preventing localized overheating and ensuring more even heat distribution from the conductive busbar 3. In contrast, the third heat-conducting zone 13 is primarily used to accommodate the molten element 2. Its smaller volume limits the range of heat diffusion, concentrating heat around the molten element 2. This allows for more precise control of the temperature environment around the molten element 2, ensuring it melts at the appropriate temperature and improving the fuse's protective performance.

[0060] In some embodiments, the volume of the first heat-conducting zone 11 is equal to the volume of the second heat-conducting zone 12. Since the two heat-conducting zones have the same volume, they have similar heat dissipation capabilities when using the same heat dissipation design and materials. For example, when the busbar 3 generates heat, the two heat-conducting zones can dissipate the heat at similar rates, avoiding the problem of excessive heat accumulation in one area while the other area dissipates heat too quickly, thus making the temperature distribution of the entire fuse more uniform.

[0061] Please combine Figures 3 to 5 In this embodiment, the main body 31 of one conductive busbar 3 is located in the first heat-conducting zone 11 and is electrically connected to one end of the melt 2, while the main body 31 of the other conductive busbar 3 is located in the second heat-conducting zone 12 and is electrically connected to the other end of the melt 2. Each conductive busbar 3 has a groove 311 on its main body 31. The design of the groove 311 reduces the heat transfer area from the melt 2 to the main body 31 of the conductive busbar 3. When the melt 2 overloads and melts, generating high temperatures, this effectively limits the rapid and large-scale conduction of heat to the main body 31 of the conductive busbar 3, preventing excessive temperature rise of the conductive busbar 3. This helps to confine the high temperature generated by the melt 2 mainly within the melt 2 itself, creating a more significant temperature difference between the melt 2 and the conductive busbar 3. This ensures that the melt 2 can perform its overload protection function within a suitable temperature range, while preventing the conductive busbar 3 from being affected by overheating.

[0062] like Figures 4 to 7 As shown, each conductive busbar 3 has a first connecting portion 32 connected to the main body 31, and each first connecting portion 32 is located within the third heat-conducting zone 13. The main body 31 of one conductive busbar 3 passes through the first partition 14 and is electrically connected to one end of the melt 2 through the first connecting portion 32. The main body 31 of the other conductive busbar 3 passes through the second partition 15 and is electrically connected to the other end of the melt 2 through the first connecting portion 32. Specifically, the first connecting portion 32 is located within the third heat-conducting zone 13, and the main body 31 of the conductive busbar 3 is electrically connected to both ends of the melt 2 through the first connecting portion 32. This direct and tight connection reduces the contact resistance at the connection point, avoiding localized overheating due to excessive contact resistance. The main body 31 of the conductive busbar 3 passes through the corresponding partition and is connected to the first connecting portion 32. The partition can provide some heat insulation, reducing the direct conduction of heat generated by the melt 2 to the main body 31 of the conductive busbar 3, thus lowering the temperature of the conductive busbar 3.

[0063] For example, the first connecting part 32 of each conductive busbar 3 can be fixedly connected to the end of the molten body 2 by means of crimping, welding or riveting, so that a strong mechanical bond can be formed between the molten body 2 and the first connecting part 32, thereby greatly reducing the risk of poor contact, loose connection or wire breakage.

[0064] Based on the above embodiments, such as Figure 7 As shown, within the same conductive busbar 3, the width of the main body 31 is smaller than the width of the first connecting portion 32. In other words, the width of the first connecting portion 32 is relatively wider, ensuring a larger contact area between the first connecting portion 32 and the molten material 2. When a large current passes through, the wider cross-sectional area can disperse the current density, avoiding problems such as local overheating and electrolytic corrosion, and ensuring the normal operation of the conductive busbar 3 under high current conditions. At the same time, the narrower main body 31 can reduce the heat transfer area from the molten material 2 to the main body 31, limiting the conduction of heat to the main body 31 when the molten material 2 melts, so that more heat is concentrated in the molten material 2 area, preventing the main body 31 from overheating and affecting electrical performance.

[0065] Please combine Figure 5 and Figure 7 In this embodiment, each conductive busbar 3 has a second connecting portion 33 connected to the main body 31. The second connecting portion 33 is located at the end of the main body 31 away from the melt 2 and at least partially extends out of the housing 1. In the same conductive busbar 3, the width of the main body 31 is smaller than the width of the second connecting portion 33. The second connecting portion 33 is usually needed to connect with other electrical equipment or lines. During the connection process, a larger contact area can effectively reduce contact resistance. Lower contact resistance means less heat is generated when current passes through, reducing energy loss and improving power transmission efficiency. It can also reduce the heating problem caused by excessive contact resistance and avoid safety hazards caused by overheating. In addition, the increased width of the second connecting portion 33 makes the current distribution in the conductor more uniform, avoiding problems such as electrolytic corrosion and overheating caused by excessive local current density, and ensuring the stability and reliability of the conductive busbar 3 under high current conditions.

[0066] It is understood that the housing 1 has a first end 16, a second end 17, and a cylindrical body 18. The first end 16 and the second end 17 are respectively disposed at both ends of the body 18 to seal the body 18. The first partition 14 is disposed close to the first end 16 relative to the second partition, and the first partition and the first end 16 are spaced apart to form a first heat-conducting zone 11. The second partition 15 and the second end 17 are spaced apart to form a second heat-conducting zone 12. The first partition 14 and the second partition are spaced apart to form a third heat-conducting zone 13. The three-section heat-conducting zone design within the housing 1 forms independent heat conduction paths through physical isolation. The zoned design can precisely control the temperature field distribution when the molten metal 2 melts, avoiding heat diffusion that could affect other components.

[0067] Specifically, one of the two conductive bars 3 extends from the first end 16 of the housing 1 into the first heat-conducting zone 11 closer to the first end 16 and is electrically connected to one end of the melt 2. The other conductive bar 3 extends from the second end 17 of the housing 1 into the second heat-conducting zone 12 closer to the second end 17 and is electrically connected to the other end of the melt 2.

[0068] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0069] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application.

Claims

1. A fuse, characterized in that, include: The housing has three independent heat-conducting zones: a first heat-conducting zone, a second heat-conducting zone, and a third heat-conducting zone, with the third heat-conducting zone located between the first and second heat-conducting zones. A melt, wherein the melt is disposed within the third heat-conducting zone; Two conductive bars are provided. One conductive bar extends from the outside of the housing into the first heat-conducting zone and is electrically connected to one end of the melt. The other conductive bar extends from the outside of the housing into the second heat-conducting zone and is electrically connected to the other end of the melt. The thermal conductivity of the first thermally conductive zone and the thermal conductivity of the second thermally conductive zone are both higher than that of the third thermally conductive zone.

2. The fuse according to claim 1, characterized in that, The housing is provided with a first partition and a second partition at intervals. The third heat-conducting area is located between the first partition and the second partition. The first heat-conducting area is located on the side of the first partition that is away from the second partition, and the second heat-conducting area is located on the side of the second partition that is away from the first partition. The thermal conductivity of both the first partition and the second partition is lower than that of the first or second thermally conductive zone.

3. The fuse according to claim 1 or 2, characterized in that, Both the first and second heat-conducting regions have a first heat-conducting medium, and the third heat-conducting region has a second heat-conducting medium. The heat conduction efficiency of the first heat-conducting medium is higher than that of the second heat-conducting medium.

4. The fuse according to claim 1 or 2, characterized in that, Both the first and second thermally conductive regions have a first thermally conductive medium, and the third thermally conductive region is a vacuum region.

5. The fuse according to claim 3, characterized in that, The first thermally conductive medium includes quartz sand or ceramic, and the second thermally conductive medium includes plastic particles, rubber particles, inert gas, or aerogel.

6. The fuse according to claim 1 or 2, characterized in that, The volume of the first heat-conducting zone and the volume of the second heat-conducting zone are both greater than the volume of the third heat-conducting zone.

7. The fuse according to claim 1 or 2, characterized in that, The volume of the first heat-conducting zone is equal to the volume of the second heat-conducting zone.

8. The fuse according to claim 2, characterized in that, One of the two conductive busbars has its main body located in the first heat-conducting zone and electrically connected to one end of the melt, while the other conductive busbar has its main body located in the second heat-conducting zone and electrically connected to the other end of the melt. Each of the conductive busbars has a groove on its main body.

9. The fuse according to claim 8, characterized in that, Each of the conductive busbars has a first connecting portion connected to the main body, and each of the first connecting portions is located within the third heat-conducting zone; The main body of one of the two conductive bars passes through the first partition and is electrically connected to one end of the melt through the first connecting part; The main body of the other of the two conductive bars passes through the second partition and is electrically connected to the other end of the melt through the first connecting part.

10. The fuse according to claim 9, characterized in that, Within the same conductive busbar, the width of the main body is smaller than the width of the first connecting part.

11. The fuse according to claim 8, characterized in that, Each of the conductive bars has a second connecting portion connected to the main body portion. The second connecting portion is disposed at the end of the main body portion away from the melt and extends at least partially outside the housing. In the same conductive bar, the width of the main body portion is smaller than the width of the second connecting portion.

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