A fuse

Abstract

The utility model provides a kind of fuse, comprising: shell, fuse, two cover plates, two connecting end, indicator, microswitch, fuse is set in shell interior, and the connecting end is connected in the both ends of fuse, two cover plates are respectively covered in the both ends of shell, connecting end is connected outside circuit by passing through cover plate, indicator is set in shell side, microswitch is set on the lateral wall of shell side corresponding indicator, and the both ends of microswitch are respectively connected on the cover plate of the both ends of shell;Connecting end is flat structure, and connecting end includes the aluminium alloy matrix in interior and the copper layer being covered on the upper and lower surfaces of aluminium alloy matrix. By this, the fuse of the utility model has better electrical performance, low cost and high mechanical strength.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit overcurrent protection devices, and more specifically relates to a fuse. Background Technology

[0002] A fuse is an electrical device that breaks the circuit by melting its fusible element when the current exceeds a specified value. Widely used in high and low voltage power distribution systems, control systems, and various electrical equipment, fuses play a crucial role in ensuring the safe operation of electrical equipment. Their basic working principle involves using a metal conductor as a fusible element connected in series in the circuit. When an overload or short-circuit current passes through the fusible element, it melts due to its own heat, thus breaking the circuit. With the continuous development of electrical equipment and the increasing diversification of application scenarios, the performance requirements for fuses are becoming increasingly stringent.

[0003] Traditional fuses have revealed numerous problems when facing high-current, high-voltage applications. For example, the electrical performance of the fuse's connection terminals is insufficient to meet the requirements of low resistance and good conductivity for high-current transmission, leading to significant heat generation during operation and affecting the fuse's normal operation and lifespan. In terms of cost, the use of pure copper or other precious metal connection terminals in some high-end fuses results in high production costs, limiting the product's market competitiveness. Regarding mechanical strength, existing connection terminal structures are prone to deformation and breakage under external impact or vibration, affecting the fuse's reliability and stability.

[0004] To address these issues, engineers in related fields have conducted extensive research and exploration. For example, there have been studies on improving fuse performance through modifications to the fusible element material and structure, as well as attempts to optimize the overall fuse structure. However, for the crucial component—the connection terminal—especially in applications where fuses are large, significantly improving mechanical strength while ensuring electrical performance and reducing costs remains a pressing technical challenge. Utility Model Content

[0005] The purpose of this invention is to provide a fuse with better electrical performance, lower cost, and higher mechanical strength.

[0006] To achieve the above objectives, this utility model provides a fuse, comprising: The device comprises a housing, a molten element, two cover plates, two connecting terminals, an indicator, and a micro switch. The molten element is located inside the housing, and connecting terminals are connected to both ends of the molten element. The two cover plates are respectively placed on both ends of the housing, and the connecting terminals extend through the cover plates to connect to external circuits. The indicator is located on the side of the housing, and the micro switch is located on the outer wall of the side of the housing corresponding to the indicator. The two ends of the micro switch are respectively connected to the cover plates at both ends of the housing. The connector has a flat structure and includes an internal aluminum alloy substrate and copper layers covering the upper and lower surfaces of the aluminum alloy substrate.

[0007] Furthermore, the aluminum alloy matrix has reinforcing ribs inside, which are distributed in a grid pattern within the aluminum alloy matrix.

[0008] Furthermore, the mechanical strength of the aluminum alloy matrix must meet a torque of at least 35 N·m; the aluminum alloy matrix is ​​made of 7-series aluminum alloy.

[0009] Furthermore, a mounting portion extends outward from the periphery of the side of the connecting end that is connected to the housing. The cover plate covers the upper end of the mounting portion to fix the connecting end to the end of the housing. The middle part of the connecting end has a connecting portion that protrudes from the housing and the cover plate.

[0010] Furthermore, the cover plate is annular, and the mounting part of the connecting end protrudes from the middle of the cover plate. The cover plate is fixed to the housing by screws.

[0011] Furthermore, an insulating gasket is provided between the cover plate and the housing.

[0012] Furthermore, each of the two cover plates is provided with a corresponding connecting piece for connecting the end of the micro switch. One end of the connecting piece is parallel to the cover plate and fixed to the cover plate, while the other end is bent toward the side of the housing and connected to the end of the micro switch parallel to the side of the housing.

[0013] Furthermore, the copper layer is coated onto the aluminum alloy substrate through a metallurgical bonding process, forming a metallurgical bond at the interface between the two.

[0014] Furthermore, the melt is made of a metal material with a high melting point and high electrical conductivity.

[0015] Furthermore, the two ends of the melt are welded or riveted to the two connecting ends respectively.

[0016] Furthermore, the thickness of one copper layer is 1mm-2mm, and the thickness of the aluminum alloy substrate is 5mm-10mm.

[0017] By adopting the above solution, this utility model has at least the following technical effects: 1. The connection end adopts a structure in which a copper layer is wrapped around the upper and lower surfaces of the aluminum alloy substrate, giving full play to the advantages of both copper and aluminum metals, so as to achieve the electrical performance of low resistance and good conductivity of the fuse when transmitting high current.

[0018] 2. Using only a copper layer to cover the upper and lower surfaces of the connector end, compared with connector ends made of pure copper or other precious metals, can reduce production costs while having a certain mechanical strength, even with little difference in electrical performance.

[0019] 3. Due to the structural design of the connection end, the aluminum alloy itself has a certain mechanical strength, which makes the fuse have good reliability and stability, and the cost is also low, thus improving its market competitiveness. Attached Figure Description

[0020] Figure 1 This is a perspective view of the present utility model.

[0021] Figure 2 for Figure 1 Cross-sectional view.

[0022] Figure 3 This is an exploded view of the present invention.

[0023] Figure 4 This is a schematic diagram of the connection end structure.

[0024] Figure 5 This is a cross-sectional view of the connection end.

[0025] Figure 6 This is a schematic diagram of the reinforcing rib structure inside the aluminum alloy matrix of this utility model (showing the enlarged single-layer structure).

[0026] Explanation of icon numbers: 1. Shell; 2. Melt; 3. Cover plate; 31. Connecting piece; 4. Connecting end; 41. Copper layer; 42. Aluminum alloy base; 43. Mounting part; 44. Connecting part; 5 indicators; 6 micro switches; 7. Sealing gasket. Detailed Implementation

[0027] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0028] See Figures 1-5 This utility model provides a fuse, comprising: The enclosure consists of a housing 1, a molten element 2, two cover plates 3, two connecting ends 4, an indicator 5, and a micro switch 6. The molten element 2 is located inside the housing 1, and the two ends of the molten element 2 are connected to the connecting ends 4. The two cover plates 3 are respectively closed on both ends of the housing 1. The connecting ends 4 extend out of the cover plates 3 and connect to the external circuit. The indicator 5 is located on the side of the housing 1. The micro switch 6 is located on the outer wall of the side of the housing 1, corresponding to the indicator 5. The two ends of the micro switch 6 are respectively connected to the cover plates 3 at both ends of the housing 1. The connecting ends 4 have a flat structure and include an internal aluminum alloy substrate 42 and copper layers 41 covering the upper and lower surfaces of the aluminum alloy substrate 42.

[0029] Considering the application conditions of the fuse of this utility model (a large-size fuse suitable for high-current, high-voltage applications), the connecting terminal 4 of this utility model is made of a combination of copper and aluminum. The aluminum alloy substrate 41 is made of a high-strength aluminum alloy (capable of meeting at least 35 N·m of torque), such as 7-series aluminum alloys, especially 7075 aluminum alloy, which has excellent tensile strength, compressive strength, flexural strength, conductivity, wear resistance, and corrosion resistance. Hard anodizing can be performed on the aluminum alloy substrate 41 to further enhance various properties. Therefore, the connecting terminal 4 of this utility model not only has excellent mechanical strength and can simultaneously leverage the conductivity advantages of copper and aluminum, but also has good wear resistance and corrosion resistance. The copper layer 41 covers the upper and lower surfaces of the connecting terminal 4. The copper layer 41 has high conductivity, which can reduce the contact resistance when the connecting terminal 4 is connected to the external circuit, ensuring smooth transmission of high current and reducing energy loss and heat generation during transmission. The aluminum alloy substrate 42 is located inside the copper layer 41 and serves as the main conductive carrier. While ensuring a certain conductivity, its good conductivity can effectively share the current, further improving the overall conductivity of the terminal electrode. This enables the fuse to operate stably under high current and high voltage conditions, greatly enhancing the electrical performance of the fuse.

[0030] The structure of the aforementioned connection terminal 4, compared to traditional connection terminals 4 which require the use of pure copper or other precious metals to improve electrical performance, has a lower cost. The connection terminal 4 of this invention uses an aluminum alloy substrate 42 as its main body. Aluminum is relatively inexpensive and abundant, significantly reducing material costs. While ensuring performance, it reduces the amount of precious metals (copper layer 41) used, resulting in a significant reduction in the overall production cost of the fuse and improving the product's market competitiveness.

[0031] like Figure 6As shown, the aluminum alloy substrate 42 of this invention has crisscrossing reinforcing ribs inside, which are distributed in a fine mesh pattern within the aluminum alloy substrate 42. That is, the interior of the aluminum alloy substrate 42 has an extremely fine mesh structure. Each intersection point in the mesh structure serves as a reinforcing rib forming node, through which stress can be dispersed to the surrounding area. This further enhances the mechanical strength of the connection terminal 4. When the fuse is used in a circuit, facing external impacts or vibrations, the reinforcing ribs can effectively disperse stress, preventing deformation or breakage of the aluminum alloy substrate 42.

[0032] When the aluminum alloy substrate 42 with internal reinforcing ribs is formed, a grid-like reinforcing rib frame (which can also be made of aluminum alloy) composed of intersecting reinforcing ribs can be first provided inside the mold, and then aluminum alloy liquid can be poured into it to form the aluminum alloy substrate 42.

[0033] In this utility model, the copper layer 41 of the connecting end 4 is coated with the aluminum alloy substrate 42 through a metallurgical bonding process. The interface between the two forms a metallurgical bond, becoming a whole. This further enhances the overall structural stability of the connecting end 4, enabling the fuse to maintain good mechanical performance in complex working environments and improving the reliability and service life of the product.

[0034] In this invention, the thickness of one copper layer 41 can be 1mm-2mm (this invention has two copper layers 41, respectively covering the upper surface and lower surface of the aluminum alloy substrate 42); the thickness of the aluminum alloy substrate 42 can be 5mm-10mm, and an extremely fine mesh structure is formed inside between the upper and lower surfaces of the aluminum alloy substrate 42. The thickness of the upper surface of the aluminum alloy substrate 42 is preferably 2mm-3mm. The thickness parameters of the copper layer 41 and the aluminum alloy substrate 42 can be adjusted according to actual needs to meet the requirements of different fuses.

[0035] The connecting end 4 of this utility model has a mounting portion 43 extending outward from one side of the housing 1. The cover plate 3 covers the upper end of the mounting portion 43 to fix the connecting end 4 to the end of the housing 1. The connecting end 4 has a connecting portion 44 protruding from the housing 1 and the cover plate 3 in the middle, which is used for electrical connection with an external circuit. The cover plate 3 is annular, and the mounting portion 43 of the connecting end 4 protrudes from the middle of the cover plate 3. The cover plate 3 and the housing 1 are fixed by screws, and an insulating sealing gasket 7 is provided between the cover plate 3 and the housing 1. Specifically, the cover plate 3, the mounting portion 43, and the end of the housing 1 have corresponding screw holes, and the sealing gasket 7 also has corresponding screw holes. The cover plate 3 and the sealing gasket 7 are tightly screwed to the end of the housing 1, firmly fixing the connecting end 4 to the end of the housing 1. The cover plate 3, the housing 1, and the sealing gasket 7 are all made of insulating material. The sealing gasket 7 is used to prevent impurities from entering the fuse body and improve the overall sealing and insulation.

[0036] Each of the two cover plates 3 is also provided with a corresponding connecting piece 31 for connecting the end of the micro switch 6. One end of the connecting piece 31 is parallel to the cover plate 3 and fixed on the cover plate 3, and the other end is bent toward the side of the housing 1 and connected to the end of the micro switch 6 parallel to the side of the housing 1.

[0037] The fusible element 2 of this invention is made of a metal material with a high melting point and high electrical conductivity, such as silver or copper. The two ends of the fusible element 2 are welded or riveted to the two connecting ends 4 respectively, thereby ensuring that the current can pass smoothly through the connecting ends 4 and the fusible element 2, so as to realize the normal operation of the fuse.

[0038] The housing 1 of this utility model is made of materials with good insulation performance, mechanical strength, heat resistance and flame retardancy, such as ceramics, high-strength engineering plastics, etc. This allows the housing 1 to not only effectively insulate and protect the fuse element 2 and the connection terminal 4 inside the fuse to prevent safety accidents such as leakage, but also to protect the fuse body from damage by external forces to a certain extent, thereby improving the overall reliability of the fuse.

[0039] The fuse body of this utility model also includes an indicator 5 and a micro switch 6. The indicator 5 is disposed on the side of the housing 1, and the micro switch 6 is disposed on the outer wall of the side of the housing 1 corresponding to the indicator 5. The two ends of the micro switch 6 are respectively connected to the cover plates 3 at both ends of the housing 1. Specifically, each of the two cover plates 3 is also provided with a connecting piece 31 corresponding to the end of the micro switch 6. One end of the connecting piece 31 is parallel to the cover plate 3 and fixed to the cover plate 3, and the other end is bent toward the side of the housing 1 and connected to the end of the micro switch 6 parallel to the side of the housing 1.

[0040] The indicator 5 is a built-in elastic trigger component, which is installed on the housing 1 and is linked to the internal molten metal 2. In the normal state of the molten metal 2, the indicator 5 is in a compressed state supported by the molten metal 2. After the molten metal 2 melts, the elastic component rebounds and triggers the indicator to act (such as the color mark popping out or the contact being connected), providing feedback on the melting status of the fuse.

[0041] The micro switch 6 is an external indicator 5 used for display. Its indication is based on the indicator 5 and is linked with the indicator 5. When the indicator 5 is activated, it triggers the micro switch 6 to output a signal, which facilitates remote monitoring or centralized alarm and is suitable for automated operation and maintenance needs.

[0042] The structures of the aforementioned indicator 5 and micro switch 6 are existing technologies, and therefore will not be described in detail here.

[0043] The above is merely one embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fuse, characterized in that, include: The device comprises a housing, a molten element, two cover plates, two connecting terminals, an indicator, and a micro switch. The molten element is located inside the housing, and connecting terminals are connected to both ends of the molten element. The two cover plates are respectively placed on both ends of the housing, and the connecting terminals extend through the cover plates to connect to external circuits. The indicator is located on the side of the housing, and the micro switch is located on the outer wall of the side of the housing corresponding to the indicator. The two ends of the micro switch are respectively connected to the cover plates at both ends of the housing. The connector has a flat structure and includes an internal aluminum alloy substrate and copper layers covering the upper and lower surfaces of the aluminum alloy substrate.

2. A fuse according to claim 1, characterized in that, The aluminum alloy matrix has internal reinforcing ribs, which are distributed in a grid pattern within the aluminum alloy matrix.

3. A fuse according to claim 1 or 2, characterized in that, The mechanical strength of the aluminum alloy matrix must meet a torque of at least 35 N·m; the aluminum alloy matrix shall be made of 7-series aluminum alloy.

4. A fuse according to claim 1 or 2, characterized in that, The connecting end has a mounting portion extending outward from the periphery of the side connected to the housing. The cover plate covers the upper end of the mounting portion to fix the connecting end to the end of the housing. The connecting end has a connecting portion protruding from the housing and the cover plate in the middle.

5. A fuse according to claim 4, characterized in that, The cover plate is ring-shaped, and the mounting part of the connecting end protrudes from the middle of the cover plate. The cover plate is fixed to the housing by screws.

6. A fuse according to claim 1 or 2, characterized in that, An insulating gasket is provided between the cover plate and the housing.

7. A fuse according to claim 1 or 2, characterized in that, Each of the two cover plates is also provided with a corresponding connecting piece for connecting the end of the micro switch. One end of the connecting piece is parallel to the cover plate and fixed on the cover plate, while the other end is bent toward the side of the housing and connected to the end of the micro switch parallel to the side of the housing.

8. A fuse according to claim 1 or 2, characterized in that, The copper layer is coated onto the aluminum alloy substrate through a metallurgical bonding process, and a metallurgical bond is formed at the interface between the two.

9. A fuse according to claim 1 or 2, characterized in that, The melt is made of a metal with a high melting point and high electrical conductivity, and the two ends of the melt are welded or riveted to the two connecting ends respectively.

10. A fuse according to claim 1 or 2, characterized in that, The thickness of one copper layer is 1mm-2mm, and the thickness of the aluminum alloy substrate is 5mm-10mm.

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