Lightning protection special backup protection fuse

Abstract

The application provides a lightning protection special backup protection fuse, belonging to the technical field of circuit system protection devices, comprising: a main body structure, a conductive part, a protection part and an elastic part, the main body structure comprises an insulating tube body, a first conductive terminal and a second conductive terminal, the insulating tube body has a cavity, the cavity is filled with arc extinguishing medium, the first conductive terminal and the second conductive terminal are arranged at intervals in the insulating tube body; the conductive part is movably arranged in the cavity and connected with the first conductive terminal; the protection part is arranged in the cavity and connected with the conductive part and the second conductive terminal respectively; the protection part can heat when the current and / or voltage received exceeds the rated value, the conductive part is disconnected with the protection part when receiving heat higher than the preset temperature; the elastic part is arranged between the main body structure and the conductive part, used for applying a driving force to the conductive part in the direction away from the protection part, so that the conductive part can quickly move away from the protection part after disconnection, improving the response speed and reliability.

Description

Technical Field

[0001] This application belongs to the technical field of circuit system protection devices, and more specifically, relates to a backup protection fuse for lightning protection. Background Technology

[0002] A fuse is a protective device in a circuit system used to disconnect the circuit when an overload or short circuit occurs, protecting other components from damage. Traditional fuses, when triggered by a large current, require the internal metal fuse wire to completely melt before the circuit can be completely disconnected. This results in a slow response time, poor reliability of the protective action, and potential safety hazards. Utility Model Content

[0003] The purpose of this application is to provide a dedicated backup protection fuse for lightning protection, so as to solve the problems of slow response speed and poor reliability of protection action of existing fuses.

[0004] To achieve the above objectives, this application provides a dedicated backup protection fuse for lightning protection, comprising:

[0005] The main structure includes an insulating tube, a first conductive terminal, and a second conductive terminal. The insulating tube has a cavity filled with an arc-extinguishing medium. The first conductive terminal and the second conductive terminal are spaced apart on the insulating tube.

[0006] A conductive element is movably disposed within the cavity and electrically connected to the first conductive terminal;

[0007] A protective component, disposed within the cavity, has a first connecting end and a second connecting end. The first connecting end is electrically connected to the conductive component, and the second connecting end is connected to the second conductive terminal. The protective component is capable of generating heat when subjected to current and / or voltage exceeding a rated value, and the conductive component disconnects from the protective component when subjected to heat exceeding a preset temperature.

[0008] An elastic element is disposed between the main structure and the conductive element, and is used to apply a driving force to the conductive element in a direction away from the protective element.

[0009] In some embodiments, the conductive element and the protective element are electrically connected by a low-temperature solder joint, which is capable of melting when subjected to heat above the preset temperature.

[0010] In some embodiments, the lightning protection backup fuse further includes a trip cap, which is slidably disposed on the first conductive terminal along a first direction. The conductive element is connected to the trip cap, and the elastic element is connected to the conductive element and / or the trip cap. When the conductive element is disconnected from the protective element, the trip cap can be moved along the first direction by the driving force and protrude from the surface of the first conductive terminal facing away from the insulating tube.

[0011] In some embodiments, the elastic element is a spring, and the lightning protection backup fuse further includes a base plate disposed on the side of the first conductive terminal facing the insulating tube. The extension direction of the spring is perpendicular to the sliding direction of the trip cap. Both extension ends of the spring are connected to the base plate and are respectively located on opposite sides of the trip cap. The spring abuts against the side of the trip cap facing away from the first conductive terminal.

[0012] In some embodiments, the release cap includes:

[0013] The sliding part has a sliding hole in the first conductive terminal, and the sliding part is slidably inserted into the sliding hole. The conductive element is connected to the sliding part.

[0014] A first limiting part protrudes from the periphery of the sliding part and is used to restrict the sliding part from disengaging from the sliding hole; the spring abuts against the first limiting part.

[0015] Two second limiting portions protrude from the side of the first limiting portion away from the sliding portion. The two second limiting portions are spaced apart in a second direction. Any two of the first direction, the second direction, and the extension direction of the spring are perpendicular to each other. At least the portion of the spring that abuts against the release cap is located between the two second limiting portions.

[0016] In some embodiments, the number of springs is multiple, and the multiple springs are arranged at intervals along the second direction.

[0017] In some embodiments, the lightning protection backup fuse further includes a flexible conductive strip, one end of which is electrically connected to the conductive element and the other end of which is electrically connected to the first conductive terminal.

[0018] In some embodiments, the insulating tube has a first extension end and a second extension end, the first extension end having a first opening communicating with the cavity and an external space, and the second extension end having a second opening communicating with the cavity and an external space; the main structure further includes:

[0019] A first sealing gasket is disposed at the first extension end and closes the first cavity. The first conductive terminal is connected to the side of the first sealing gasket facing away from the insulating tube. The first sealing gasket has a first through hole. The conductive element slides through the first through hole and is electrically connected to the first conductive terminal.

[0020] And / or, a second sealing gasket is disposed at the second extension end and closes the second cavity, the second conductive terminal is connected to the side of the second sealing gasket facing away from the insulating tube, and the second sealing gasket is provided with a second through hole, the second connecting end of the protective member passes through the second through hole and is electrically connected to the second conductive terminal.

[0021] In some embodiments, the first sealing gasket has a receiving cavity facing the first conductive terminal, the first through hole connects the cavity and the receiving cavity, and the elastic member and the release cap are both disposed within the receiving cavity.

[0022] In some embodiments, the protective element includes a gas discharge tube.

[0023] The beneficial effects of the lightning protection backup fuse provided in this application are as follows: Compared with the prior art, under normal operating conditions, the conductive component and the protective component maintain the circuit continuity through electrical connection; when the current abnormally increases, causing the protective component to heat up to above a preset temperature, the connection between the conductive component and the protective component is broken, quickly cutting off the circuit, and the arc-extinguishing medium filled in the cavity can interrupt and extinguish the arc; at the same time, the elastic component allows the conductive component to quickly move away from the protective component after disconnection, further ensuring the speed and stability of the connection and disconnection between the conductive component and the protective component, and improving the reliability of circuit system protection. In addition, it also has the advantages of simple and compact structure, easy miniaturization design, reduced space occupation in the circuit system, and is suitable for use in environments such as miniaturized power equipment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the lightning protection backup fuse in the embodiments of this application;

[0026] Figure 2 This is a cross-sectional view of the lightning protection backup fuse in the embodiments of this application;

[0027] Figure 3This is an exploded view of the lightning protection backup fuse in the embodiments of this application;

[0028] Figure 4 This is a cross-sectional view of the lightning protection backup fuse in the embodiments of this application when the conductive part and the protective part are disconnected;

[0029] Figure 5 This is a partial view of the lightning protection backup fuse in the embodiments of this application.

[0030] The following are the labeling elements in the figure:

[0031] 100-Main structure; 110-Tube body; 1101-Cavity; 120-First conductive terminal; 121-First pin; 1201-Sliding hole; 130-Second conductive terminal; 131-Second pin; 1301-Connecting hole; 140-First sealing gasket; 1401-Receiving cavity; 1402-First through hole; 150-Second sealing gasket; 1501-Second through hole; 160-Bolt; 200-Conductive component; 300-Protective component; 301-First connecting end; 302-Second connecting end; 400-Trigger cap; 401-Mounting cavity; 410-Sliding part; 420-First limiting part; 430-Second limiting part; 500-Spring; 600-Base plate; 610-Connecting ring; 601-First clearance hole; 602-Second clearance hole; 700-Flexible conductive strip. Detailed Implementation

[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0034] It should be understood that the terms "length", "width", "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.

[0035] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] Reference Figures 1-3 This application provides a backup protection fuse for lightning protection, including: a main structure 100, a conductive component 200, a protective component 300, and an elastic component.

[0037] The main structure 100 is used to house and support other components and provide necessary electrical isolation. The main structure 100 includes an insulating tube 110, a first conductive terminal 120, and a second conductive terminal 130. The insulating tube 110 has a cavity 1101 filled with an arc-quenching medium, and the first conductive terminal 120 and the second conductive terminal 130 are spaced apart from each other on the insulating tube 110.

[0038] The insulating tube 110 is a tubular structure made of insulating materials such as ceramic or glass fiber. Its internal cavity 1101 is used to accommodate components such as the conductive element 200, the protective element 300, and the elastic element. An arc-extinguishing medium is filled within the cavity 1101 to absorb the electric arc generated when the conductive element 200 and the protective element 300 disconnect, accelerating the extinguishing of the arc. In some embodiments, the arc-extinguishing medium can be quartz sand. The insulating tube 110 has a first extension end and a second extension end in its extending direction. The first extension end may have a first opening connecting the cavity 1101 to the external space, and the second extension end may have a second opening connecting the cavity 1101 to the external space. This allows the conductive element 200, the protective element 300, and the elastic element to be installed inside the cavity 1101 through the first and / or second openings, and facilitates the filling of the cavity 1101 with the arc-extinguishing medium.

[0039] The first conductive terminal 120 and the second conductive terminal 130 are conductive structures made of materials with good conductivity, such as copper or copper alloys. The first conductive terminal 120 and the second conductive terminal 130 are spaced apart on the insulating tube 110 and are used for input current and output current, respectively. In this embodiment, the first conductive terminal 120 and the second conductive terminal 130 are respectively connected to the two ends of the insulating tube 110 in the axial direction, that is, the first conductive terminal 120 is connected to the first extension end of the insulating tube 110, and the second conductive terminal 130 is connected to the second extension end of the insulating tube 110.

[0040] The first conductive terminal 120 and the second conductive terminal 130 can be configured in any shape. For example, the shapes of the first conductive terminal 120 and the second conductive terminal 130 can be the same as the axial end face shape of the insulating tube 110 to match the shape of the insulating tube 110 and seal the first and second cavities of the insulating tube 110, thus protecting the components inside the cavity 1101. In addition, the first conductive terminal 120 may also have a protruding first pin 121, and the second conductive terminal 130 may have a protruding second pin 131, so that the first pin 121 and the second pin 131 can be used to connect the lightning protection backup fuse to other circuit components.

[0041] In some embodiments, the main structure 100 may further include a first sealing gasket 140, which is disposed at the first extended end and closes the first cavity. A first conductive terminal 120 is connected to the side of the first sealing gasket 140 facing away from the insulating tube 110. The first sealing gasket 140 may be made of elastic insulating materials such as silicone rubber or fluororubber. The shape of the first sealing gasket 140 may match the end face shape of the first extended end of the insulating tube 110 and cover the first extended end, so as to close the first cavity with the first sealing gasket 140. At the same time, the first conductive terminal 120 presses the first sealing gasket 140 against the insulating tube 110 to achieve a sealed connection between the first sealing gasket 140 and the insulating tube 110, preventing the arc-extinguishing medium from leaking from the first cavity and ensuring the stability of the internal environment of the lightning protection backup fuse.

[0042] The first conductive terminal 120 can be fixed to the insulating tube 110 by multiple bolts 160. Specifically, the first conductive terminal 120 and the first sealing gasket 140 are provided with a number of bolt holes for the bolts 160 to pass through, and the end face of the first extension end of the insulating tube 110 is provided with a corresponding number of threaded holes. The bolts 160 are sequentially passed through the threaded holes on the first conductive terminal 120, the first sealing gasket 140 and the insulating tube 110 to fix the first conductive terminal 120 and the first sealing gasket 140 to the insulating tube 110.

[0043] In some embodiments, the main structure 100 may further include a second sealing gasket 150, which is disposed at the second extended end and closes the second cavity. A second conductive terminal 130 is connected to the side of the second sealing gasket 150 facing away from the insulating tube 110. The second sealing gasket 150 may also be made of elastic insulating materials such as silicone rubber or fluororubber. The shape of the second sealing gasket 150 may match the end face shape of the second extended end of the insulating tube 110 and cover the second extended end to close the second cavity. Simultaneously, the second conductive terminal 130 presses the second sealing gasket 150 against the insulating tube 110, achieving a sealed connection between the second sealing gasket 150 and the insulating tube 110, further preventing leakage of the arc-extinguishing medium from the second cavity and ensuring the stability of the internal environment of the lightning protection backup fuse.

[0044] The second conductive terminal 130 can also be fixed to the insulating tube 110 by multiple bolts 160. Specifically, the second conductive terminal 130 and the second sealing gasket 150 are each provided with a number of bolt holes for the bolts 160 to pass through. The end face of the second extension end of the insulating tube 110 is also provided with a corresponding number of threaded holes. The bolts 160 are sequentially passed through the threaded holes on the second conductive terminal 130, the second sealing gasket 150 and the insulating tube 110, thereby firmly fixing the second conductive terminal 130 and the second sealing gasket 150 to the insulating tube 110.

[0045] The conductive element 200 is movably disposed within the cavity 1101 and electrically connected to the first conductive terminal 120. The conductive element 200 can be made of high-melting-point conductive materials such as copper or silver, or low-melting-point conductive materials such as tin-lead alloys, lead, or zinc. The appropriate melting point of the conductive element 200 can be selected based on the application environment of the lightning protection backup fuse. The conductive element 200 can be configured in any shape to accommodate the connection of other components within the cavity 1101. In this embodiment, the conductive element 200 is rod-shaped, and its extension direction is parallel to the extension direction of the insulating tube 110. The first sealing gasket 140 has a first through hole 1402, the shape of which matches the shape of the conductive element 200. The conductive element 200 passes through the first through hole 1402 and is electrically connected to the first conductive terminal 120.

[0046] The protective component 300 is disposed within the cavity 1101 and has a first connecting end 301 and a second connecting end 302. The first connecting end 301 is electrically connected to the conductive component 200, and the second connecting end 302 is electrically connected to the second conductive terminal 130. The protective component 300 can generate heat when energized. When the conductive component 200 is subjected to heat exceeding a preset temperature, it disconnects from the protective component 300 to cut off the circuit conduction.

[0047] In some embodiments, the protective element 300 may include a gas discharge tube. The gas discharge tube is filled with an inert gas. Free electrons in the inert gas enable circuit conduction. When the current and voltage exceed rated values, the free electrons in the inert gas are accelerated under the influence of an electric field, colliding with and ionizing neutral molecules to generate new electrons and positive ions. These electrons and positive ions generate heat through collisions during their movement. Compared to conventional resistive heating elements, it has higher energy density and faster response speed, generating sufficient heat in a very short time to melt the conductive element 200. Furthermore, the gas discharge tube has stable electrical performance and a long service life, making it suitable for various applications requiring rapid circuit disconnection. Additionally, due to its small size, the gas discharge tube, integrated within the cavity 1101, does not increase the overall size of the lightning protection backup fuse, facilitating the miniaturization design of the lightning protection backup fuse.

[0048] The first connecting end 301 and the second connecting end 302 of the protective member 300 can be the two ends of the protective member 300 in the axial direction of the insulating tube 110, respectively. The first connecting end 301 faces the direction of the first conductive terminal 120. The conductive member 200 is located between the first conductive terminal 120 and the protective member 300. The two extended ends of the conductive member 200 are electrically connected to the first conductive terminal 120 and the first connecting end 301 of the protective member 300, respectively, to realize the conduction between the first conductive terminal 120 and the first connecting end 301. The second connecting end 302 extends toward the direction of the second conductive terminal 130. The second sealing gasket 150 is provided with a second through hole 1501. The shape of the second through hole 1501 matches the shape of the second connecting end 302, and the second connecting end 302 passes through the second through hole 1501 and is electrically connected to the second conductive terminal 130. The second conductive terminal 130 may have a connection hole 1301, and the second connection end 302 is inserted into the connection hole 1301 to realize the electrical connection between the second conductive terminal 130 and the second connection end 302.

[0049] In some embodiments, the conductive element 200 can be electrically connected to the protective element 300 via a low-temperature solder joint, which can melt and break when exposed to heat above a preset temperature. The low-temperature solder joint is made of a welding material with a low melting point, and the conductive element 200 is welded and fixed to the first connection end 301 of the protective element 300. The melting point temperature of the low-temperature solder joint can be lower than the melting point temperature of the conductive element 200. Under normal operation, the low-temperature solder joint can maintain the electrical connection between the conductive element 200 and the protective element 300, ensuring the smooth flow of the circuit. When the current abnormally increases, causing the protective element 300 to heat up to above the preset temperature, the low-temperature solder joint will melt and break before the conductive element 200, thereby further improving the response speed of the lightning protection backup fuse.

[0050] An elastic element is disposed between the main structure 100 and the conductive element 200. The elastic element can be a spring 500 or a spring sheet, etc., and is used to apply a driving force to the conductive element 200 in a direction away from the protective element 300. In this embodiment, the lightning protection backup fuse also includes a trip cap 400 and a base plate 600. The trip cap 400 is slidably disposed on the first conductive terminal 120 along a first direction, and the conductive element 200 is connected to the trip cap. The base plate 600 is disposed on the side of the first conductive terminal 120 facing the insulating tube 110. The elastic element is a spring 500, and the spring 500 is connected and fixed to the base plate 600 and connected to the trip cap 400, so that the trip cap 400 applies a spring force to the conductive element 200 in a direction away from the protective element 300.

[0051] When the conductive component 200 and the protective component 300 are connected, the spring 500 continuously applies a driving force to the conductive component 200 away from the protective component 300 to maintain a stable connection between them. When the current abnormally increases, causing the protective component 300 to heat up to above a preset temperature, the connection between the conductive component 200 and the protective component 300 is broken. The driving force of the spring 500 can then quickly move the conductive component 200 away from the protective component 300, ensuring the reliability of the circuit disconnection.

[0052] Reference Figures 2-4 The trip cap 400 is slidably disposed on the first conductive terminal 120 along the first direction. The conductive element 200 is connected to the trip cap 400, and the spring 500 is connected to the trip cap 400. When the conductive element 200 is disconnected from the protective element 300, the trip cap 400 can be driven to move along the first direction and protrude from the surface of the first conductive terminal 120 facing away from the insulating tube 110.

[0053] In this embodiment, the first direction can be the axial direction of the insulating tube 110, that is, the trip cap 400 is slidably connected to the first conductive terminal 120 along the axial direction of the insulating tube 110. The trip cap 400 can be configured in any shape, such as columnar, block-shaped, or ring-shaped, to adapt to the overall structure and installation requirements of the lightning protection backup protection fuse. In this embodiment, the trip cap 400 includes a sliding part 410 and a first limiting part 420. The first conductive terminal 120 has a sliding hole 1201, which extends along the first direction. The sliding part 410 is slidably inserted into the sliding hole 1201 of the first conductive terminal 120, realizing the sliding of the trip cap 400 in the first direction. The first limiting part 420 protrudes from the periphery of the sliding part 410 to limit the sliding part 410 from disengaging from the sliding hole 1201. The sliding part 410 can be configured as a hollow shell structure, and the sliding part 410 has an opening on the side facing the insulating tube 110. The end of the conductive component 200 away from the protective component 300 can be fixed to the inner wall of the mounting cavity 401 by welding or other means.

[0054] The elastic element can be connected to at least one of the conductive element 200 and the trip cap 400. Since the trip cap 400 and the conductive element 200 are connected to each other, a driving force can be applied to the elastic element and the trip cap 400 at the same time, so that the conductive element 200 and the trip cap 400 can be moved while the conductive element 200 is disconnected from the protective element 300.

[0055] The substrate 600 is a plate structure attached to the surface of the first conductive terminal 120. The substrate 600 can be made of metal or non-metal material. In this embodiment, the substrate 600 is located between the first conductor and the first sealing gasket 140, and the substrate 600 also has a plurality of bolt holes 160 through which bolts 160 can pass, so that the first conductive terminal 120 presses the substrate 600 onto the first sealing gasket 140. The substrate 600 may have a first clearance hole 601, which coincides with the sliding hole 1201 on the first conductive terminal 120, and the sliding part 410 of the trip cap 400 passes through the first clearance hole 601 to avoid interference with the movement of the trip cap 400.

[0056] Spring 500 can be a cylindrical helical spring 500, and the extension direction of spring 500 can be perpendicular to the first direction. Both extension ends of spring 500 are connected to substrate 600 and are located on opposite sides of trip cap 400, with spring 500 abutting against the side of trip cap 400 facing away from the first conductive terminal 120. In this embodiment, substrate 600 is provided with multiple connecting rings 610, and the extension ends of spring 500 are hooked onto the corresponding connecting rings 610. Spring 500 can be low-lying on the first limiting portion 420 of trip cap 400. When conductive member 200 and protective member 300 are connected, trip cap 400 pushes spring 500 away from substrate 600, thereby causing spring 500 to undergo elastic deformation and store elastic potential energy. When conductive member 200 and protective member 300 are disconnected, spring 500 releases the stored elastic potential energy and resets, pushing trip cap 400 to move along the first direction.

[0057] Furthermore, referring to Figure 5 The trip cap 400 may further include two second limiting portions 430, which protrude from the side of the first limiting portion 420 away from the sliding portion 410. The two second limiting portions 430 are spaced apart in a second direction. Any two of the first direction, the second direction, and the extension direction of the spring 500 are perpendicular to each other. At least the portion of the spring 500 that abuts against the trip cap 400 is located between the two second limiting portions 430. The second direction may be a horizontal direction perpendicular to the axial direction of the insulating tube 110. The two second limiting portions 430 form a guide groove structure to restrict the lateral extension end of the spring 500 between the second limiting portions 430, preventing the spring 500 from radially displacing and detaching from the trip cap 400 during compression or extension.

[0058] In some embodiments, the number of springs 500 can be set to multiple, and the multiple springs 500 are arranged at intervals along the second direction. Both extended ends of each spring 500 are fixed to the base plate 600. The elastic modulus and compression stroke of the multiple springs 500 are consistent to ensure that a uniform linear driving force is applied to the trip cap 400 and the conductive element 200. The multiple springs 500 can also serve as redundant backups for each other. Even if one spring 500 fails, the other springs 500 can still ensure the normal operation of the trip cap 400 and the conductive element 200, thereby enhancing the overall reliability of the lightning protection backup fuse.

[0059] In the initial state of connection between the conductive element 200 and the protective element 300, the end face of the sliding part 410 may slightly protrude from the surface of the first conductive terminal 120 or be completely embedded in the sliding hole 1201. When the conductive element 200 is disconnected from the protective element 300, the driving force of the elastic element pushes the conductive element 200 and the trip cap 400 together to move in a direction away from the protective element 300, making the part of the trip cap 400 protruding from the first conductive terminal 120 more obvious, thereby realizing a visual indication of the status of the lightning protection backup fuse. Operators can intuitively judge the working status of the lightning protection backup fuse by the protruding state of the trip cap 400, and can quickly identify the lightning protection backup fuse that has blown without disassembly, improving maintenance efficiency. In addition, the protruding trip cap 400 can also serve as a replacement indicator to prevent the misuse of blown devices and enhance electrical safety.

[0060] In some embodiments, the lightning protection backup fuse may further include a flexible conductive strip 700, one end of which is electrically connected to the conductive element 200 and the other end of which is electrically connected to the first conductive terminal 120.

[0061] The flexible conductive strip 700 is made of a bendable metal braided material, and its length is greater than the straight-line distance between the conductive element 200 and the first conductive terminal 120. Both ends of the conductive strip can be fixed to the sidewall of the conductive element 200 and the inner surface of the first conductive terminal 120 by welding or riveting. In this embodiment, a second clearance hole 602 can also be provided on the substrate 600. The flexible conductive strip 700 passes through the second clearance hole 602 and connects to the first conductive terminal 120, realizing the electrical connection between the conductive element 200 and the first conductive terminal 120. When the conductive element 200 is heated and detaches from the protective member 300 and moves under the action of the elastic member, the flexible conductive strip 700 can bend and move with the movement of the conductive element 200 without obstructing its movement.

[0062] In some embodiments, the first sealing gasket 140 may be provided with a receiving cavity 1401 facing the first conductive terminal 120, and the first through hole 1402 connects the cavity 1101 and the receiving cavity 1401. The elastic element, the release cap 400 and the flexible conductive strip 700 may all be disposed in the receiving cavity 1401.

[0063] Specifically, a portion of the first sealing gasket 140 can protrude toward the insulating tube 110 to form a receiving cavity 1401 that opens toward the first conductive terminal 120, providing installation space for the elastic element, trip cap 400, and flexible conductive strip 700. The arc-extinguishing medium in the cavity 1101 will not enter the receiving cavity 1401 and interfere with the movement of the elastic element, trip cap 400, and other components. At the same time, the first conductive terminal 120 and the substrate 600 can completely seal the opening of the receiving cavity 1401 during assembly, which protects the internal structure. There is no need to set up an additional independent installation space on the insulating tube 110, making the overall structure of the lightning protection backup protection fuse more compact and suitable for the miniaturization design of lightning protection backup protection fuses.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A backup protection fuse specifically for lightning protection, characterized in that, include: The main structure includes an insulating tube, a first conductive terminal, and a second conductive terminal. The insulating tube has a cavity filled with an arc-extinguishing medium. The first conductive terminal and the second conductive terminal are spaced apart on the insulating tube. A conductive element is movably disposed within the cavity and electrically connected to the first conductive terminal; A protective component, disposed within the cavity, has a first connecting end and a second connecting end. The first connecting end is electrically connected to the conductive component, and the second connecting end is connected to the second conductive terminal. The protective component is capable of generating heat when subjected to current and / or voltage exceeding a rated value, and the conductive component disconnects from the protective component when subjected to heat exceeding a preset temperature. An elastic element is disposed between the main structure and the conductive element, and is used to apply a driving force to the conductive element in a direction away from the protective element.

2. The backup protection fuse for lightning protection according to claim 1, characterized in that, The conductive component and the protective component are electrically connected by a low-temperature solder joint, which can melt when subjected to heat above the preset temperature.

3. The lightning protection backup fuse according to claim 1, characterized in that, The lightning protection backup fuse also includes a trip cap, which is slidably disposed on the first conductive terminal along a first direction. The conductive element is connected to the trip cap, and the elastic element is connected to the conductive element and / or the trip cap. When the conductive element is disconnected from the protective element, the trip cap can be moved along the first direction by the driving force and protrude from the surface of the first conductive terminal facing away from the insulating tube.

4. The lightning protection backup fuse according to claim 3, characterized in that, The elastic element is a spring. The lightning protection backup fuse also includes a base plate disposed on the side of the first conductive terminal facing the insulating tube. The extension direction of the spring is perpendicular to the sliding direction of the trip cap. Both extension ends of the spring are connected to the base plate and are respectively located on opposite sides of the trip cap. The spring abuts against the side of the trip cap facing away from the first conductive terminal.

5. The lightning protection backup fuse according to claim 4, characterized in that, The release cap includes: The sliding part has a sliding hole in the first conductive terminal, and the sliding part is slidably inserted into the sliding hole. The conductive element is connected to the sliding part. A first limiting part protrudes from the periphery of the sliding part and is used to restrict the sliding part from disengaging from the sliding hole; the spring abuts against the first limiting part. Two second limiting portions protrude from the side of the first limiting portion away from the sliding portion. The two second limiting portions are spaced apart in a second direction. Any two of the first direction, the second direction, and the extension direction of the spring are perpendicular to each other. At least the portion of the spring that abuts against the release cap is located between the two second limiting portions.

6. The lightning protection backup fuse according to claim 5, characterized in that, The number of springs is multiple, and the multiple springs are arranged at intervals along the second direction.

7. The lightning protection backup fuse according to claim 1, characterized in that, The lightning protection backup fuse also includes a flexible conductive strip, one end of which is electrically connected to the conductive element, and the other end is electrically connected to the first conductive terminal.

8. The lightning protection backup fuse according to claim 3, characterized in that, The insulating tube has a first extension end and a second extension end. The first extension end has a first opening connecting the cavity to the external space, and the second extension end has a second opening connecting the cavity to the external space. The main structure further includes: A first sealing gasket is disposed at the first extension end and closes the first cavity. The first conductive terminal is connected to the side of the first sealing gasket facing away from the insulating tube. The first sealing gasket has a first through hole. The conductive element slides through the first through hole and is electrically connected to the first conductive terminal. And / or, a second sealing gasket is disposed at the second extension end and closes the second cavity, the second conductive terminal is connected to the side of the second sealing gasket facing away from the insulating tube, and the second sealing gasket is provided with a second through hole, the second connecting end of the protective member passes through the second through hole and is electrically connected to the second conductive terminal.

9. The lightning protection backup fuse according to claim 8, characterized in that, The first sealing gasket has a receiving cavity facing the first conductive terminal, the first through hole connects the cavity and the receiving cavity, and the elastic element and the release cap are both disposed in the receiving cavity.

10. The lightning protection backup fuse according to any one of claims 1-9, characterized in that, The protective component includes a gas discharge tube.

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