Excitation fuse for circuit protection based on double-melt design

Abstract

The invention relates to the technical field of excitation fuses, in particular to a double-melt design-based excitation fuse for circuit protection, which comprises a device body, the device body is filled with a medium area and is formed by connecting an upper shell and a lower shell through bolts, two sides of the upper shell and the lower shell are respectively provided with an electrode plate by forming clamping grooves, and the clamping grooves are formed in the two sides of the upper shell and the two sides of the lower shell. The interiors of the two electrode plates are connected through two melt strips; the excitation assembly is mounted at the top of the upper shell and is used for cutting off the joint of the two melt strips after receiving the signal; the separation assembly is arranged in the lower shell and is connected with the two melt strips respectively; according to the invention, through the combination of the low-current monitoring device and the separation assembly, the fuse strip is directly driven to be separated when the abnormal value of the current is relatively low instead of depending on heat accumulation fusing; fusing failure or delay caused by insufficient heat accumulation of a traditional fuse under low current is effectively avoided, the risks of insulation aging and short circuit of equipment are effectively prevented, and the requirement for rapid and accurate action of an electric protection device is met.

Description

Technical Field

[0001] This invention relates to the field of excitation fuse technology, specifically to an excitation fuse for circuit protection based on a dual-fuse design. Background Technology

[0002] As a core component of circuit protection, fuses are widely used in power generation, distribution, energy storage, and electric vehicles. Their basic function is to quickly disconnect the circuit in case of abnormal current (such as overload or short circuit) to prevent equipment damage. Furthermore, most existing fuses use pure silver (resistivity 1.59 × 10⁻⁶) as the fusible element. -8 (Ω·m) or copper alloys (such as CuZn37, with a resistivity of approximately 6.0 × 10⁻⁶ ...). -8 However, its high thermal conductivity (silver thermal conductivity 429 W / m·K) leads to insufficient heat accumulation under low current.

[0003] An activated fuse is a type of fuse that uses an external excitation signal (such as an electrical signal) to trigger a mechanical disconnection mechanism, designed to overcome the shortcomings of purely thermal melting. In traditional fuses, the action relies entirely on current and heat, while activated fuses introduce a driving device (such as a gas generator or electric motor) to achieve active control.

[0004] Dual-element design refers to the parallel arrangement of two or more fuse elements within the fuse housing to improve current breaking capacity and system reliability. In traditional fuses, the fuse element is typically a single metallic conductor (such as silver or copper alloy), while the dual-element design distributes the current load through redundant structure, reducing the risk of single-point failure.

[0005] The inventors discovered the following drawbacks in existing fuses: 1. When the current abnormal value is low (such as in the intermittent current region), the parallel fuses of the excitation fuse may fail to operate effectively due to uneven current distribution. The two fuses rely on the melting of solder to guide the fuse to break, but when the heat accumulation is insufficient under low current, the risk of fuse failure is high. 2. Intermittent currents can easily lead to difficulties in extinguishing arcs and slow recovery of insulation at the break point. This may trigger secondary arcs, and ultimately, prolonged overload can cause the equipment insulation layer to age faster, become brittle, or even break due to overheating, creating a short circuit hazard and potentially damaging sensitive electronic components.

[0006] 3. When the molten metal is only cut off, an electric arc will be generated. If the arc extinguishing measures are not appropriate (such as failure to replace a damaged molten tube or improper filling with quartz sand), the electric arc may not be extinguished in time, posing a safety hazard. Summary of the Invention

[0007] The purpose of this invention is to provide an excitation fuse for circuit protection based on a dual-fuse design, in order to solve the problem mentioned in the background art where uneven current distribution of parallel fuse elements in the excitation fuse leads to some fuse elements failing to operate effectively, resulting in a high risk of fuse failure.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an excitation fuse for circuit protection based on a dual-fuse design, comprising: The device body is filled with a medium region and is composed of an upper shell and a lower shell connected by bolts. An electrode plate is installed on each side of the upper shell and the lower shell by means of a snap-fit ​​groove. The two electrode plates are connected by two molten strips. The excitation assembly, which is mounted on the top of the upper housing, is used to cut off the connection between the two melt bars after receiving a signal; The detachment component is installed inside the lower housing and connected to two molten bars respectively. When started, it causes the two molten bars to detach in opposite directions and disconnects the molten bars from the electrode plates. The driven component connects the excitation component and the disengagement component, and actively drives the disengagement component to move when the excitation component is activated.

[0009] As a further improvement to the above solution, the excitation assembly includes an excitation cavity installed on the top of the upper housing. The excitation cavity has a cylindrical cross-section with a convex shape, and an excitation device is installed on the top of its inner wall. The lower inner wall of the excitation chamber is connected to a slider by multiple vertical strips evenly spaced. The top of the slider and the middle of the excitation device form a sealed chamber. A cutter is fixedly connected to both sides of the bottom end of the slider. Both cutters are parallel to the extension direction of the short side of the melt strip. A transverse central baffle is fixedly connected to the middle of the inner wall of the upper shell, and a side upper baffle is symmetrically installed on both sides of the central baffle. The two side upper baffles are parallel to the central baffle. A support plate is symmetrically and vertically fixed to both sides of the bottom end of the lower shell. The tops of the two support plates are inclined when they are close to each other. The two support plates form a receiving area to receive the melt strip cut by the cutter. Parallel side lower baffles are symmetrically installed on the inner wall of the lower shell. The middle of the two side lower baffles is connected to the outside of the support plate. When the upper shell and the lower shell are connected, the matching side lower baffles are parallel to the side upper baffles and abut against the melt strip.

[0010] As a further improvement to the above solution, the detachment component includes threaded rods symmetrically rotatably connected to both sides of the lower housing. The two threaded rods are respectively threadedly connected by threaded sleeve blocks fixedly connected to the bottom end of the melt bar. One side of each of the two threaded rods is coaxially fixedly connected to a driven sprocket outside the lower housing, and the two driven sprockets are connected to each other by a chain. A drive sprocket is connected to the middle of the chain, and a rotating shaft is coaxially fixed to the middle of the drive sprocket. A housing is installed outside the driven sprocket, chain, and drive sprocket. The outer side of the housing is coaxially connected to a micro motor through the rotating shaft. A connecting strip is provided on one side of the melt strip, and the connecting strip is used to slide horizontally to the electrode plate through the connecting groove. The two melt strips are respectively provided with interlocking grooves and interlocking strips on the side that are close to each other, and are horizontally connected to each other through the interlocking grooves and interlocking strips. Two melt bars are respectively located above the inclined edge of the support plate with weak grooves.

[0011] As a further improvement to the above solution, the driven component includes a rotating shaft located outside the housing and coaxially connected to an impeller. An impeller cavity is installed outside the impeller, and a vertical connecting air port is opened on one side of the impeller cavity. The connecting air port at the top is connected to the sealed chamber through a connecting hose, and a one-way valve is provided at the connection between the connecting hose and the sealed chamber.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention combines a low-current monitoring device with a disconnection component to directly drive the fuse bar to separate when the current abnormal value is low, rather than relying on heat accumulation to melt. This effectively avoids the failure or delay of traditional fuses due to insufficient heat accumulation under low current, effectively prevents equipment insulation aging and short circuit risks, and meets the needs of electrical protection devices for fast and accurate operation.

[0013] 2. This invention utilizes the retraction component to allow the molten strip to slide horizontally away from the electrode plate through the reverse movement of the threaded rod and threaded sleeve block, rather than permanently melting it; and during power outage maintenance, the device body can be directly disassembled to inspect or replace the molten strip, reducing the need for overall replacement, improving equipment lifespan and economy, and meeting the usage requirements of maintainable protection devices.

[0014] 3. This invention utilizes the gas generated by the excitation component to drive the impeller via the driven component, ensuring continued operation even in the event of a micro-motor failure, thus preventing protection failure due to a single point of failure. This improves overall reliability and is particularly suitable for high-voltage, high-current scenarios.

[0015] 4. This invention uses the cutter in the excitation component to cooperate with the inclined surface of the support plate to cut off the weak grooves of the melt, which can ensure that the melt strip is cut off quickly and push the cut melt into the medium, effectively controlling the electric arc and preventing secondary arcing.

[0016] 5. By working in conjunction with a low-current monitoring device, this invention can automatically select the activation or deactivation mode according to the type of current anomaly, thereby achieving intelligent circuit disconnection and reducing manual intervention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 For the present invention Figure 1 Top view.

[0019] Figure 3 For the present invention Figure 2 Cross-sectional view along the AA direction.

[0020] Figure 4 For the present invention Figure 3 A cross-sectional view of the excitation device completing the cutting action.

[0021] Figure 5 For the present invention Figure 2 Cross-sectional view in the BB direction.

[0022] Figure 6 This is a three-dimensional structural cross-sectional view of the present invention.

[0023] Figure 7 For the present invention Figure 6 The front view.

[0024] Figure 8 This is a three-dimensional cross-sectional structural diagram of the upper shell of the present invention.

[0025] Figure 9 This is a schematic diagram of the overall structure of the present invention detached from the components.

[0026] Figure 10 This is a schematic diagram of the overall structure of the present invention after it is started without components.

[0027] Figure 11 This is an overall schematic diagram of the connection state between the disengaged component and the driven component of the present invention.

[0028] In the diagram: 1. Upper shell; 11. Excitation chamber; 12. Excitation device; 13. Vertical bar; 14. Slider; 15. Cutter; 16. Middle baffle; 17. Upper side baffle; 18. Snap-fit ​​groove; 2. Lower shell; 21. Support plate; 22. Lower side baffle; 23. Threaded rod; 24. Driven sprocket; 25. Chain; 26. Outer shell; 27. Rotating shaft; 28. Driving sprocket; 29. ​​Impeller; 210. Micro motor; 211. Impeller cavity; 212. Connecting hose; 3. Electrode plate; 31. Connecting slot; 32. Connecting strip; 33. Melt strip; 34. Insertion slot; 35. Insertion strip; 36. Weak groove; 37. Threaded sleeve block; 4. Medium area. Detailed Implementation

[0029] 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.

[0030] See Figures 1-11 This invention provides an excitation fuse for circuit protection based on a dual-fuse design, comprising: The device body is filled with a medium region 4 and is composed of an upper shell 1 and a lower shell 2 connected by bolts. An electrode plate 3 is installed on each side of the upper shell 1 and the lower shell 2 by means of a snap-fit ​​groove 18. The two electrode plates 3 are connected by two melt strips 33. It should be noted that the commonly used medium can be quartz sand or solid gas-generating materials (such as whiteboard or plexiglass). Furthermore, medium zone 4 is filled with quartz sand (SiO2 purity ≥ 99%, water content < 0.1%), or solid gas-generating materials such as polyoxymethylene (POM, gas production 300 cm³ / h). 3 / g).

[0031] Area and density: Filler density 1.8 g / cm³ 3 ±0.1, occupying more than 85% of the cavity volume, ensuring an arc coverage area of ​​≥95%; quartz sand accumulation angle of 30° to avoid collapse.

[0032] The excitation assembly, which is installed on the top of the upper housing 1, is used to cut off the connection between the two melt bars 33 after receiving a signal; It should be noted that the excitation assembly includes an excitation cavity 11 installed on the top of the upper housing 1. The cross-section of the excitation cavity 11 is a cylindrical shape with a convex shape. An excitation device 12 is installed on the top of its inner wall. A slider 14 is connected to the lower inner wall of the excitation cavity 11 by a plurality of vertical strips 13 evenly provided. The top of the slider 14 and the middle of the excitation device 12 form a sealed chamber. A cutter 15 is fixedly connected to both sides of the bottom end of the slider 14. Both cutters 15 are parallel to the extension direction of the short side of the melt strip 33.

[0033] Furthermore, the melt strip 33 can be made of silver-plated copper alloy with a thickness of 0.2 mm, and can be repeatedly inserted and removed ≥1000 times.

[0034] Furthermore, the gas-generating agent in the excitation device 12 is lead azide (NaN3), with a dosage of 50mg ± 5mg and a gas production rate of 5L / g; the slider 14 can be made of aluminum alloy 6061 (density 2.7g / cm³). 3 (Tensile strength 310MPa); the cutter 15 can be made of cemented carbide YG8 (hardness HRA89). The volume of the excitation chamber 11 is 50 cm³. 3 ±5%, vertical bar 13 spacing 2mm±0.1mm, ensuring slider 14 stroke 20mm; cutter 15 blade angle 30°±2°, blade thickness 0.5mm.

[0035] It should be noted that the specific dimensions of the equipment must be based on the actual situation. The dimensions mentioned above are relative dimensions, not absolute dimensions, and are for reference only.

[0036] For details, please refer to Figure 3 and Figure 4 The cutter 15 can cut the connected melt strips 33 and push the cut melt strips 33 into the two support plates 21, initially completing the cutting process of the melt, allowing the medium to move outward and completing the covering of the cut melt block.

[0037] See Figures 3-8 When the excitation device 12 receives the trigger signal, its internal electronic ignition device ignites the gas-generating agent, which rapidly undergoes a chemical reaction, releasing a large amount of high-pressure gas in a very short time (microseconds), providing a huge driving force and pushing the slider 14 downwards. The cutter cuts the middle of the two molten strips 33, thus isolating the circuit.

[0038] It should be noted that the slider 14 has positioning slots around its perimeter and slides with the vertical bar 13 through the positioning slots. Sealing rubber is installed in sequence in the positioning slots to ensure the airtightness of the sealed chamber and to ensure that the excitation device 12 cuts off the melt bar 33.

[0039] Furthermore, a groove of equal depth (not shown) is provided in each positioning slot and at the same horizontal plane on the outer wall of the slider 14, and a rubber ring (not shown) is fitted in the groove and fits against the outer wall of the slider 14, so that the slider 14 can slide along the vertical bar 13 while ensuring its own airtightness.

[0040] A transverse middle baffle 16 is fixedly connected to the middle of the inner wall of the upper shell 1. A side upper baffle 17 is symmetrically installed on both sides of the middle baffle 16, and the two side upper baffles 17 are parallel to the middle baffle 16.

[0041] See Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 8 The middle baffle 16 and the upper side baffle 17 restrict the vertical movement of the melt strip 33 at the bottom and can block the slider 14 when the excitation device 12 is started, so as to avoid damage to the device body and ensure that the medium inside the equipment is not exposed.

[0042] A support plate 21 is symmetrically and vertically fixedly connected to both sides of the bottom end of the lower housing 2. The tops of the two support plates 21 are inclined at their close proximity. The two support plates 21 form a receiving area for receiving the melt strip 33 cut by the cutter 15.

[0043] Parallel side lower baffles 22 are symmetrically installed on the inner wall of the lower shell 2. The middle part of the two side lower baffles 22 is connected to the outer side of the support plate 21. When the upper shell 1 and the lower shell 2 are connected, the matching side lower baffles 22 are parallel to the side upper baffles 17 and abut against the melt strip 33.

[0044] See Figure 3 and Figure 4 The inclined setting surface, combined with the weak groove 36 opened at the top, can quickly cut the melt strip 33 with the cutter 15 after the excitation device 12 is started. The upper side baffle 17 and the lower side baffle 22, which are fixed at the top and bottom, can stabilize the melt strip 33 on the outer side after cutting. This ensures that the melt strip 33 can still slide horizontally after cutting, so as to completely detach from the electrode plate 3 and allow the medium to completely cover the electrode plate 3.

[0045] Secondly, it also includes a detachment component, which is installed in the lower housing 2 and connected to two melt bars 33 respectively. When started, it causes the two melt bars 33 to detach in opposite directions and releases the connection between the melt bars 33 and the electrode sheet 3. The disengagement assembly includes threaded rods 23 symmetrically rotatably connected to both sides of the lower housing 2. The two threaded rods 23 are respectively threadedly connected by threaded sleeves 37 fixedly connected to the bottom end of the melt strip 33. A driven sprocket 24 is coaxially fixedly connected to one side of the two threaded rods 23 outside the lower housing 2. The two driven sprockets 24 are connected to each other by a chain 25. A driving sprocket 28 is connected to the middle of the chain 25. A rotating shaft 27 is coaxially fixedly connected to the middle of the driving sprocket 28. An outer shell 26 is installed outside the driven sprockets 24, chain 25, and driving sprocket 28. The outer side of the outer shell 26 is coaxially connected to the micro motor 210 through the rotating shaft 27.

[0046] Furthermore, the threaded rod 23 can be made of SUS304 stainless steel with a thread precision of 0.1mm.

[0047] See Figure 9 and Figure 10 The two sets of connected threaded sleeves 37 are connected to the threaded rods 23 in opposite directions. When the two threaded rods 23 rotate synchronously, the melt strips 33 connected to the threaded sleeves 37 slide in opposite directions, accelerate the separation of the melt strips 33, and realize the separation of the melt strips 33 from the electrode plates 3, further improving the separation effect of the device.

[0048] It should be noted that the threaded sleeve 37 can be made of phosphor bronze (C5191, which has high wear resistance and a coefficient of friction of 0.1).

[0049] A connecting strip 32 is provided on one side of the melt strip 33, and the connecting strip 32 is used to slide horizontally to the electrode plate 3 through the connecting groove 31. The two melt strips 33 are respectively provided with interlocking grooves 34 and interlocking strips 35 on the side of their proximity, and are horizontally slidably connected through the interlocking grooves 34 and interlocking strips 35. The two melt strips 33 are respectively provided with weak grooves 36 above the inclined edge of the support plate 21.

[0050] See Figure 9 and Figure 10 The bottom end of the weak groove 36 is engaged with the inclined edge of the top of the support plate 21, which facilitates the activation of the internal air when the activating device 12 is started, and pushes the cutter 15 to cut the melt strip 33. The melt strip 33 is cut through the connection of the insertion groove 34 and the insertion strip 35, and the entire melt strip 33 is pushed into the internal filling medium.

[0051] There is also a driven component, which connects the excitation component and the disengagement component, and actively drives the disengagement component to move when the excitation component is activated.

[0052] The driven component includes a rotating shaft 27 located outside the housing 26 and coaxially connected to an impeller 29. An impeller cavity 211 is installed outside the impeller 29. A vertical air inlet is provided on one side of the impeller cavity 211. The air inlet at the top is connected to the sealed chamber through a connecting hose 212, and a one-way valve is provided at the connection between the connecting hose 212 and the sealed chamber.

[0053] See Figure 1 , Figure 2 , Figure 6 and Figure 7 The one-way valve only supports the gas to be discharged from the closed chamber to the connecting port, and then discharged to the other side through the connecting port. When the gas is discharged, the impeller 29 drives the rotating shaft 27 to rotate actively, thereby realizing the synchronous rotation of the two threaded rods 23.

[0054] Furthermore, the one-way valve has an opening pressure of 0.1 MPa and a response time of ≤1 ms.

[0055] Specifically, the longitudinal section of the entire impeller cavity 211 is nearly "Ω" shaped. When the excitation device 12 is started, the powerful airflow transmitted through the connecting hose 212 enters the impeller cavity 211 and, when it is transmitted outward through the connecting air port, it can drive the impeller 29 to drive the rotating shaft 27 to rotate, thereby achieving synchronous drive to disengage from the component and enabling the cut melt strip 33 to slide synchronously in the opposite direction.

[0056] Furthermore, the connecting hose 212 is made of a flexible material, specifically polytetrafluoroethylene, perfluoroethylene propylene, or silicone rubber, which combines flexibility with excellent insulation.

[0057] It also includes a small current monitoring device connected to the equipment. Depending on the application scenario and requirements, it can be used in conjunction with a small current grounding fault selection device, an overhead fault indicator, or a DC power supply monitoring module. When a small current abnormality is detected, it can start the disconnection component operation to directly separate the internal fusible strip 33, thereby reducing the loss of device materials. It can also disassemble the device body after a power outage and check or replace the fusible strip 33.

[0058] Furthermore, the monitoring device can use a Hall sensor with an accuracy of ±1% and a response time of ≤10ms; the separation action time of the melt bar 33 is ≤50ms, and the breaking current is as low as 1.5 times the rated value, which is better than the traditional 100ms delay.

[0059] This invention needs to be used in conjunction with the monitoring device described above. First, the entire melt strip 33, electrode sheet 3, and slider 14 need to be installed in sequence. Then, the device is filled with a medium and the upper housing 1 and lower housing 2 are locked. Finally, the electrode sheet 3 is used to connect the circuit.

[0060] Specifically, the upper and lower housings (1 / 2) can be filled separately during the medium filling process. After the lower housing 2 is installed and filled, the bottom of the upper housing 1 can be sealed with a rigid material (such as a glass plate) when the upper housing 1 and the lower housing 2 are connected. After the upper housing 1 and the lower housing 2 are aligned, the rigid material is removed.

[0061] When the equipment is in use, if the monitoring device detects that the current value is low and the duration is long and insufficient to melt the molten strip 33, the disconnection component will be activated. The micro motor 210 will receive the signal and drive the drive sprocket 28 and the two threaded rods 23 to rotate. Relying on the threaded connection of the threaded sleeve block 37, the two molten strips 33 will slide in opposite directions along the positioning of the upper side baffle 17 and the lower side baffle 22, thereby disconnecting the circuit and issuing an alarm signal to wait for the operator to inspect and maintain them.

[0062] When the current value is abnormally high, the voltage is too high. After the monitoring device senses it, it sends a signal to the excitation device 12. The excitation device 12 will start and impact the internal gunpowder, pressurizing the sealed space of the closed chamber. Under the air pressure, the slider 14 drives the cutter 15 to cut the molten strip 33. At the same time, the air pressure in the closed chamber can be input into the impeller cavity 211 through the one-way valve, and under the pressure, the impeller 29 drives the drive sprocket 28 to rotate, so that the two threaded rods 23 can drive the melt strip 33 to slide relative to each other, thus completely disconnecting the circuit.

[0063] The driven component enables rapid startup in case of failure or delayed response of the micro motor 210, increasing the fault tolerance of the equipment.

[0064] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A circuit protection excitation fuse based on a dual-fuse design, characterized in that, include: The device body is filled with a medium region and is composed of an upper shell and a lower shell connected by bolts. An electrode plate is installed on each side of the upper shell and the lower shell by means of a snap-fit ​​groove. The two electrode plates are connected by two molten strips. The excitation assembly, which is mounted on the top of the upper housing, is used to cut off the connection between the two melt bars after receiving a signal; The detachment component is installed inside the lower housing and connected to two molten bars respectively. When started, it causes the two molten bars to detach in opposite directions and disconnects the molten bars from the electrode plates. The driven component connects the excitation component and the disengagement component, and actively drives the disengagement component to move when the excitation component is activated.

2. The excitation fuse for circuit protection based on a dual-fuse design according to claim 1, characterized in that: The excitation assembly includes an excitation cavity mounted on the top of the upper housing. The excitation cavity has a cylindrical cross-section with a convex shape, and an excitation device is mounted on the top of its inner wall.

3. The excitation fuse for circuit protection based on a dual-fuse design according to claim 2, characterized in that: The lower inner wall of the excitation chamber is connected to a slider by a plurality of vertical strips evenly spaced. The top of the slider and the middle of the excitation device form a sealed chamber. A cutter is fixedly connected to each side of the bottom end of the slider, and both cutters are parallel to the extension direction of the short side of the melt strip.

4. The circuit protection excitation fuse based on a dual-fuse design according to claim 2, characterized in that: A transverse central baffle is fixedly connected to the middle of the inner wall of the upper shell, and a side upper baffle is symmetrically installed on both sides of the central baffle, with the two side upper baffles parallel to the central baffle.

5. The circuit protection excitation fuse based on a dual-fuse design according to claim 1, characterized in that: A support plate is symmetrically and vertically fixed to both sides of the bottom end of the lower shell. The tops of the two support plates are inclined at their close points. The two support plates form a receiving area for receiving the melt strip cut by the cutter. Parallel side lower baffles are symmetrically installed on the inner wall of the lower shell. The middle of the two side lower baffles is connected to the outer side of the support plate. When the upper shell and the lower shell are connected, the matching side lower baffles are parallel to the side upper baffles and abut against the melt strip.

6. The excitation fuse for circuit protection based on a dual-fuse design according to claim 1, characterized in that: The detachment assembly includes threaded rods symmetrically rotatably connected to both sides of the lower housing. The two threaded rods are respectively threadedly connected by threaded sleeve blocks fixedly connected to the bottom end of the melt strip. One side of each threaded rod is coaxially fixedly connected to a driven sprocket outside the lower housing, and the two driven sprockets are connected to each other by a chain.

7. The circuit protection excitation fuse based on a dual-fuse design according to claim 6, characterized in that: A drive sprocket is connected to the middle of the chain, and a rotating shaft is coaxially fixedly connected to the middle of the drive sprocket. A housing is installed outside the driven sprocket, the chain, and the drive sprocket. The outer side of the housing is coaxially connected to a micro motor through the rotating shaft.

8. The circuit protection excitation fuse based on a dual-fuse design according to claim 6, characterized in that: A connecting strip is provided on one side of the melt strip, and the connecting strip is used to slide horizontally to the electrode sheet through the connecting groove. The two melt strips are respectively provided with interlocking grooves and interlocking strips on the side that are close to each other, and are horizontally slidably connected through the interlocking grooves and interlocking strips.

9. A circuit protection excitation fuse based on a dual-fuse design according to claim 8, characterized in that: Two melt bars are respectively located above the inclined edge of the support plate with weak grooves.

10. The circuit protection excitation fuse based on a dual-fuse design according to claim 1, characterized in that: The driven component includes a rotating shaft located outside the outer casing and coaxially connected to an impeller. An impeller cavity is installed outside the impeller. A vertical air inlet is provided on one side of the impeller cavity. The air inlet at the top is connected to a sealed chamber through a connecting hose, and a one-way valve is provided at the connection between the connecting hose and the sealed chamber.

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