Motion indicating device for fuse link and power grid equipment

Abstract

The invention discloses an action indicating device for a fuse link and power grid equipment, and relates to the field of fuse structures, and the action indicating device for the fuse link comprises a main fuse body; the auxiliary melt is arranged in parallel with the main melt, the resistance of the auxiliary melt is far greater than that of the main melt, and the melting point of the auxiliary melt is far lower than that of the main melt; the linkage assembly is connected with the auxiliary melt; and the energy storage assembly is matched with the linkage assembly, and the linkage assembly is used for extruding the energy storage assembly when the auxiliary melt is not fused. According to the action indicating device for the fuse link, the main fuse body and the auxiliary fuse body are arranged in parallel, and after the main fuse body is fused due to overload or short circuit faults, circuit current is transferred to the parallel auxiliary fuse body branch, so that the auxiliary fuse body is fused rapidly, and the energy storage assembly releases all energy instantly; and the indicating piece is pushed to generate a clear visual identifier or a switching value signal.

Description

Technical Field

[0001] This invention relates to the field of fuse structure technology, and more specifically, to an operation indication device for a fuse element. Furthermore, this invention also relates to a power grid device including the aforementioned operation indication device for a fuse element. Background Technology

[0002] As an important circuit protection device, fuses are widely used in power systems, industrial equipment, and household appliances, primarily for overload and short-circuit protection. With the increasing demands for power quality and safety from electrical equipment, the reliability and maintainability of fuses are receiving growing attention.

[0003] Currently, most fuses widely used in the market are of the filled, sealed tubular structure. This structure has good breaking capacity and arc-extinguishing performance, but it has a significant drawback: when the fuse element trips, i.e., after melting, because the tubing is sealed and filled with arc-extinguishing materials such as quartz sand, the tripping process produces almost no externally visible physical changes or signal output. Maintenance personnel cannot directly determine whether the fuse element has tripped from its appearance; they usually need to use instruments such as multimeters to measure its continuity or resistance value, or they can only indirectly detect it by waiting for the circuit to lose power.

[0004] This design, lacking intuitive action indicators, causes significant inconvenience for on-site troubleshooting and routine inspections. Especially in multi-circuit power distribution systems or enclosed electrical cabinets, locating tripped fuses is often time-consuming and laborious, hindering the rapid restoration of electrical equipment. Furthermore, it cannot provide remote alarm or automatic switchover to backup circuits.

[0005] In summary, how to intuitively and reliably indicate the operating status of the fuse without altering its main structure is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an action indication device for a fuse element, which can clearly display the action status of the fuse element without changing the main structure of the fuse.

[0007] Another object of the present invention is to provide a power grid device including the above-described operation indication device for a fuse.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] An actuation indication device for a fuse element, comprising:

[0010] Main melt;

[0011] A secondary melt is connected in parallel with the main melt. The resistance of the secondary melt is much greater than that of the main melt, and the melting point of the secondary melt is much lower than that of the main melt.

[0012] The linkage component is connected to the secondary melt.

[0013] An energy storage component is configured in conjunction with the linkage component, the linkage component being used to compress the energy storage component while the secondary melt is not melted.

[0014] Preferably, the energy storage component includes a spring, which abuts against the linkage component.

[0015] Preferably, the linkage component includes an indicator and a fixing pad, the fixing pad being fixedly connected to the sub-melt, and the indicator abutting against the fixing pad.

[0016] Preferably, the fixing pad has two through holes, the indicator has a cap-shaped structure, and the fixing pad is used to fix the sub-melt in a designated position within the indicator.

[0017] Preferably, the outer wall of the indicator is provided with color marks or raised structures for displaying the action status.

[0018] Preferably, it further includes a fixing cap and a secondary molten tube, wherein the secondary molten tube has a cavity inside, and the fixing cap is used to confine the indicator within the cavity of the secondary molten tube.

[0019] Preferably, it also includes a main melt tube, and the auxiliary melt tube is detachably connected to the main melt tube.

[0020] Preferably, both the main molten tube and the auxiliary molten tube are filled closed tubular structures.

[0021] Preferably, it further includes an alarm component, which is connected to the linkage component and is used to issue an alarm when the secondary melt breaks.

[0022] A power grid device includes an operation indication device for a fuse, wherein the operation indication device for the fuse is any of the above-mentioned operation indication devices for fuses.

[0023] This invention provides an action indication device for a fusible link. By connecting a main fusible link and a secondary fusible link in parallel, the secondary fusible link is de-energized when the main fusible link is not melted. At this time, the circuit operates normally, and the linkage component is pulled by the secondary fusible link. Simultaneously, the linkage component can press the energy storage component to store energy. When the main fusible link melts, the secondary fusible link is energized. Since the melting point of the secondary fusible link is much lower than that of the main fusible link, it will melt rapidly after being energized. At this time, the linkage component is no longer pulled by the secondary fusible link, and the energy storage component is no longer pressed by the linkage component. This allows the linkage component to pop out, making it in a popped-out state, which is completely different from the pressed state. This facilitates direct observation and eliminates the need for professionals to use multimeters or other tools to measure its resistance for determination, greatly improving convenience. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 An exploded view of the actuation indication device for a fusible link provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the action indication device for a fuse provided by the present invention;

[0027] Figure 3 This is an assembly flowchart of the action indication device for a fuse provided by the present invention.

[0028] Figure label:

[0029] Sub-melt 1; Spring 2; Indicator 3; Wire fixing pad 4; Fixing cap 5; Sub-melt tube 6. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The core of this invention is to provide an action indication device for a fuse element, which can intuitively and reliably indicate the action status of the fuse element without changing the main structure of the fuse.

[0032] Another core aspect of this invention is to provide a power grid device that includes the aforementioned action indication device for a fuse.

[0033] It should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", and "rear" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the purpose of facilitating the description of this application and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] This application provides an action indication device for a fusible link, comprising: a main fusible link, a secondary fusible link 1, a linkage component, and an energy storage component;

[0035] Among them, the secondary melt 1 is set in parallel with the main melt, the resistance of the secondary melt 1 is much greater than that of the main melt, and the melting point of the secondary melt 1 is much lower than that of the main melt.

[0036] The linkage component is connected to the secondary melt 1;

[0037] The energy storage component and the linkage component are set together. The linkage component is used to squeeze the energy storage component when the secondary melt 1 has not melted.

[0038] For details, please refer to the appendix. Figure 1 With appendix Figure 3Because the resistance of the secondary fuse 1 is much greater than that of the primary fuse, under normal circuit conditions, the current mainly flows through the primary fuse, while almost no current flows through the secondary fuse 1. Therefore, it does not generate additional heat or energy consumption, nor does its own resistance affect the electrical parameters of the main circuit. Furthermore, although the melting point of the secondary fuse 1 is much lower than that of the primary fuse, its temperature cannot rise to the melting point under normal conditions due to the extremely small current, thus preventing malfunctions and ensuring the stability and reliability of the fuse under rated operating conditions. When the primary fuse melts due to overload or short circuit, the circuit current is forced to transfer to the parallel secondary fuse branch. Because the resistance of the secondary melt 1 is relatively high, concentrated heat will be generated on it. Since the melting point of the secondary melt 1 is much lower than that of the main melt, it can heat up and melt rapidly. This ensures that after the main melt activates, the secondary melt 1 will activate in a very short time, avoiding indication delay or failure and improving the timeliness of fault response. When the secondary melt 1 is not melted, the linkage component compresses the energy storage component, causing the energy storage component to pre-store elastic potential energy. When the secondary melt 1 melts, the linkage component loses its constraint, and the energy storage component instantly releases all its energy, driving the indicator to generate a clear visual mark or switching signal. Compared to relying on… The structure, driven by the deformation of the molten metal itself or by gravity, allows for faster action and a more complete stroke. It can be reliably triggered even under conditions of vibration, tilting, or packing resistance, significantly improving the stability of the indicating device. The entire action indicating device relies entirely on mechanical energy storage and the electrical characteristics of the auxiliary molten metal 1, requiring no additional power supply or electronic components. It is suitable for the limited space inside a filled enclosed tubular fuse. Maintenance personnel can intuitively judge the status of the fuse and can also remotely alarm or automatically activate the backup circuit through switch signals, reducing the difficulty of inspection and improving the automation level of the power supply system.

[0039] Based on the above embodiments, the energy storage component includes a spring 2, which abuts against the linkage component.

[0040] Specifically, spring 2, as a standard mechanical component, has a simple structure, low cost, and easily stores energy through compression or stretching. Direct contact between spring 2 and the linkage component eliminates the need for additional transmission or conversion mechanisms, facilitating seamless installation within the limited space of the fuse housing without affecting the layout of the main fusible element and filler. Furthermore, after being compressed by the linkage component, spring 2 stably stores elastic potential energy without leakage or aging issues. When the secondary fusible element 1 melts, causing the linkage component to lose its constraint, spring 2 immediately applies force directly to the linkage component through its contact surface, propelling it to move rapidly. Compared to structures relying on gravity, fusible element deformation, or air pressure, the spring energy storage method is less affected by external environmental factors such as vibration, tilting, and filler resistance, resulting in more decisive and reliable operation.

[0041] Optionally, by selecting springs 2 with different stiffness or length, the pushing distance and force can be easily adjusted, thereby ensuring that the linkage component can fully extend the fixing cap to form a clearly visible visual mark on the tube wall, or reliably trigger the micro switch to output a switching signal, so that the device can be adapted to fuses of different specifications.

[0042] Based on the above embodiments, the linkage component includes an indicator 3 and a fixing pad 4. The fixing pad 4 is fixedly connected to the sub-melt 1, and the indicator 3 and the fixing pad 4 abut against each other.

[0043] Specifically, the fixed pad 4 is fixedly connected to the secondary melt 1. When the secondary melt 1 melts and breaks, the fixed pad 4 loses its tensile force as the secondary melt 1 breaks, and its position changes. Because the indicator 3 directly abuts against the fixed pad 4, the movement of the fixed pad 4 can be immediately transmitted to the indicator 3. This direct abutment method reduces action delay and energy loss, and improves the action sensitivity and reliability of the indicator device. During normal operation, the auxiliary melt 1 is in good condition, and the fixed pad 4 is tightened or positioned in a fixed position by the auxiliary melt 1. It also constrains the indicator 3 through the abutment relationship, keeping the indicator 3 in an inactive state. Only after the auxiliary melt 1 is truly melted will the fixed pad 4 lose its constraint, thus allowing the indicator 3 to move under the push of the energy storage component. This avoids the possibility of the indicator accidentally extending due to external factors such as vibration and impact, and enhances the stability of the device under complex working conditions. When the fuse is replaced, it is only necessary to reinstall the new auxiliary melt 1, fix the fixed pad 4 to the auxiliary melt 1, and abut the indicator 3 against the fixed pad 4 again, while compressing the energy storage component to complete the reset. The structural design of the entire linkage component makes the reset operation intuitive and fast, without the need for special tools, thus reducing maintenance costs.

[0044] Based on the above embodiment, the fixing pad 4 is provided with two through holes, the indicator 3 is a cap-shaped structure, and the fixing pad 4 is used to fix the sub-melt 1 in a designated position inside the indicator 3.

[0045] Specifically, two perforations are made on the fixing pad 4, and both ends of the auxiliary melt 1 pass through these two perforations respectively. Then, they are fixedly connected to the fixing pad 4 by knotting. Compared with single-point fixing, the double-perforation structure can effectively prevent the auxiliary melt 1 from rotating or sliding relative to the fixing pad 4, ensuring that the fixing pad 4 is always in the preset positioning state during normal operation, thereby stably constraining the indicator 3 and compressing the energy storage component. The indicator 3 is designed as a cap-shaped structure, that is, a cylindrical shape with one end open and the other end closed or with a side wall. Its interior forms a receiving cavity, and the fixing pad 4, the end of the auxiliary melt 1, and the spring 2 and other parts can be installed in the cap-shaped cavity. The inner wall of the cap-shaped structure can provide a diameter for the fixing pad 4 and the spring 2. The indicator 3 is guided by a limit and axial direction to ensure that it can move linearly in a predetermined direction when the energy storage component releases energy, avoiding jamming or deflection and improving the smoothness of the action and the accuracy of the indication. The auxiliary melt 1 is fixed in a designated position inside the indicator 3 by the fixing pad 4, such as at a preset length from the bottom of the cap. This allows for precise control of the amount of compression of the energy storage component by the linkage component before the auxiliary melt 1 melts. This makes the amount of energy stored in the energy storage component during the pre-compression stage adjustable and controllable. After the auxiliary melt 1 melts, the distance that the energy storage component pushes the indicator 3 out can also remain consistent. This ensures that the output of the visual mark or switch signal after each action can achieve the expected effect, which is beneficial to the consistency and reliability of the product.

[0046] Based on the above embodiments, the outer wall of the indicator 3 is provided with color marks or raised structures for displaying the action status.

[0047] Specifically, color-coded indicators, such as red or green, or raised structures, such as dots or rings, are placed on the outer wall of the indicator. When the fuse trips, the indicator 3 extends outward under the push of the energy storage component, exposing the color-coded indicator or raised structure to the visible area of ​​the fuse housing, such as a transparent window, opening, or end cap edge. Maintenance personnel can quickly determine whether the fuse has tripped simply by visual inspection, without the need for multimeters, test pens, or other instruments, greatly reducing the difficulty and time cost of on-site troubleshooting. The color-coded indicator is a surface-coated or injection-molded color layer, unaffected by vibration, moisture, or minor dirt, and can be identified even in dim environments with a flashlight. The raised structure is a physical deformation, independent of color, and can still be observed by touch or side view under strong light, oil stains, or fading conditions. Both can be used individually or in combination, ensuring the reliability of the indicator function under different lighting conditions, environments, and service life.

[0048] Based on the above embodiment, it also includes a fixing cap 5 and a secondary melt tube 6. The secondary melt tube 6 has a cavity inside, and the fixing cap 5 is used to confine the indicator 3 within the cavity of the secondary melt tube 6.

[0049] Specifically, the fixing cap 5 is installed at the end or inside the secondary melt tube 6, confining the indicator 3 within the cavity of the secondary melt tube 6. During normal operation, even under external vibration or impact, the indicator 3 cannot detach from the cavity on its own, thus avoiding false indications caused by accidental displacement. At the same time, the fixing cap 5 provides an axial stop for the indicator 3, ensuring that the energy storage components, such as the spring 2, remain stably in a ready-to-fire state after being compressed, without premature release. The cavity inside the secondary melt tube 6 has a predetermined shape and size, forming a sliding fit with the outer wall of the indicator 3. While limiting the indicator 3 at its end, the fixing cap 5 also acts as a guide sleeve, ensuring that the indicator 3 can move linearly along the cavity axis when pushed by the spring 2, without deflection or jamming. This guiding structure improves the sensitivity and reliability of the action, ensuring that the color mark or raised structure can be fully extended.

[0050] Based on the above embodiments, a main melt tube is also included, and the auxiliary melt tube 6 is detachably connected to the main melt tube.

[0051] For details, please refer to the appendix. Figure 2 The main fuse tube and the auxiliary fuse tube 6 are separate structures that can be manufactured independently. They are then assembled into a complete fuse using detachable connection methods, such as threads, snaps, plugs, or interference fits. This modular division of labor facilitates assembly line operations, reduces overlapping processes, improves production efficiency, and also facilitates individual testing and inspection of the action indicator. When a fuse trips due to overload or short circuit, usually only the entire fuse body needs to be replaced. However, if the auxiliary fuse tube 6 and its internal indicator are relatively complex and costly, while the main fuse tube remains intact, the detachable connection allows for the replacement of only the auxiliary fuse tube assembly or only the action indicator, while retaining the main fuse tube for reuse. Of course, in practice, fuses are often replaced as a whole in one go, but the detachable design at least provides users with options and facilitates disassembly for inspection or upgrading of the indicator in non-faulty situations.

[0052] Based on the above embodiments, both the main fusible tube and the auxiliary fusible tube 6 are filled closed tubular structures.

[0053] Specifically, the filled closed-tube structure refers to filling the tube shell with an arc-extinguishing medium such as quartz sand. When the molten metal melts and generates an arc, the filler can absorb the arc energy, cool the arc, and accelerate its extinguishing. The main fuse tube adopts this structure to ensure reliable arc extinguishing when the main molten metal breaks large currents, preventing the arc from ejecting outside the tube and causing safety accidents. The auxiliary fuse tube 6 also adopts this structure, so that the weak arc generated when the auxiliary molten metal 1 is activated can also be effectively extinguished by the filler, avoiding damage to the indicating device or surrounding components. The consistent design of both ensures that the entire fuse has excellent arc-extinguishing performance at each breaking stage.

[0054] Based on the above embodiments, an alarm component is also included, which is connected to the linkage component and is used to issue an alarm when the secondary melt 1 melts.

[0055] Specifically, when the secondary fuse 1 melts due to the action of the main fuse, the linkage component triggers the energy storage component to release energy, simultaneously causing the alarm component to immediately emit an audible, visual, or electrical signal. Maintenance personnel can immediately know that the fuse has tripped without going to the site to use a multimeter or waiting for the circuit to be de-energized, greatly shortening the fault response time.

[0056] Optionally, the alarm component may be a microswitch, limit switch, or mechanically triggered buzzer that can quickly emit sound, light, or electrical signals.

[0057] In addition to the aforementioned fuse operation indication device, the present invention also provides a power grid device including the fuse operation indication device disclosed in the above embodiments. The structure of other parts of the power grid device is described in the prior art and will not be repeated here.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above provides a detailed description of a power grid device for indicating the action of a fuse, as provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An actuation indication device for a fuse, characterized in that, include: Main melt; A secondary melt (1) is connected in parallel with the main melt. The resistance of the secondary melt (1) is much greater than that of the main melt, and the melting point of the secondary melt (1) is much lower than that of the main melt. The linkage component is connected to the sub-melt (1); An energy storage component is configured in conjunction with the linkage component, the linkage component being used to squeeze the energy storage component when the secondary melt (1) is not melted.

2. The actuation indication device for a fuse according to claim 1, characterized in that, The energy storage component includes a spring (2), which abuts against the linkage component.

3. The actuation indication device for a fuse according to claim 2, characterized in that, The linkage component includes an indicator (3) and a fixing pad (4). The fixing pad (4) is fixedly connected to the sub-melt (1), and the indicator (3) abuts against the fixing pad (4).

4. The actuation indication device for a fuse according to claim 3, characterized in that, The fixing pad (4) has two through holes, the indicator (3) has a cap-shaped structure, and the fixing pad (4) is used to fix the sub-melt (1) in a designated position inside the indicator (3).

5. The actuation indication device for a fuse according to claim 4, characterized in that, The outer wall of the indicator (3) is provided with color marks or raised structures for displaying the action status.

6. The actuation indication device for a fuse according to claim 5, characterized in that, It also includes a fixing cap (5) and a secondary melt tube (6), the secondary melt tube (6) having a cavity inside, and the fixing cap (5) being used to confine the indicator (3) within the cavity of the secondary melt tube (6).

7. The actuation indication device for a fuse according to claim 6, characterized in that, It also includes a main melt tube, and the auxiliary melt tube (6) is detachably connected to the main melt tube.

8. The actuation indication device for a fuse according to claim 7, characterized in that, Both the main molten tube and the auxiliary molten tube (6) are filled closed tubular structures.

9. The actuation indication device for a fuse according to any one of claims 1 to 8, characterized in that, It also includes an alarm component, which is connected to the linkage component and is used to issue an alarm when the sub-melt (1) melts.

10. A power grid device, comprising an indication device for the operation of a fuse element, characterized in that, The action indication device for the fuse is the action indication device for the fuse as described in any one of claims 1 to 9.

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