A drop-out fuse

Abstract

The application belongs to the technical field of fuses, and discloses a drop-out fuse, which comprises a high-strength insulator, the top of the high-strength insulator is fixedly provided with a protective plate, and the top of the protective plate is fixedly provided with a connector; the fourth spring, the second butt block and the memory metal are arranged to achieve the purpose of recycling the fuse tube; when the memory metal is heated, it will reset and contract, and pull down the butt rod, the transmission ring, the connecting rod and the contact block; the top of the contact block will be separated from the bottom of the first spring, so that the circuit is disconnected; after the memory metal is cooled, according to the characteristics of the memory metal, the memory metal will be deformed; at this time, the fourth spring will reset and push the second butt block upward to contact the first butt block, so that the fuse tube can be recycled, thereby improving the practicability of the fuse tube, prolonging the service life of the fuse and reducing the cost, and the effect of recycling the fuse tube is achieved.

Description

Technical Field

[0001] This invention belongs to the field of fuse technology, specifically a drop-out fuse. Background Technology

[0002] Drop-out fuses are the most commonly used short-circuit protection switches for 10kV distribution line branches and distribution transformers. Installed on 10kV distribution line branches, drop-out fuses can reduce the scope of power outages. Because they have a clearly visible disconnect point, they function as disconnecting switches, creating a safe working environment for the lines and equipment under maintenance.

[0003] The working principle of drop-out fuses is generally as follows: the moving contacts at both ends of the fuse tube are secured by the fuse wire. After the upper moving contact is pushed into the protruding part of the "duckbill," the upper stationary contact, made of phosphor bronze or similar material, presses against the upper moving contact, thus firmly locking the fuse tube in the "duckbill." When a short-circuit current blows the fuse wire, the upper and lower moving contacts of the fuse tube lose the securing force of the fuse wire. Under the weight of the fuse tube itself and the action of the spring plates of the upper and lower stationary contacts, the fuse tube quickly falls, breaking the circuit and disconnecting the faulty section of the line or the faulty equipment. When a short circuit occurs, the fuse in the drop-out capacitor will automatically melt, thus protecting the circuit. However, when the fuse wire melts, the fuse tube cannot be used anymore and needs to be replaced, making it impossible to reuse the fuse tube. This reduces the practicality of the drop-out fuse and increases the circuit maintenance cost. Summary of the Invention

[0004] To address the problems mentioned in the background art, this invention provides a drop-out fuse. When a short circuit occurs, the circuit current overload generates a high temperature, causing the temperature inside the fuse tube to rise instantaneously. The shape memory metal, exposed to heat, will revert to its original position and contract. Since the top of the shape memory metal is fixedly connected to the bottom of the second mating block, it pulls the second mating block downwards, causing the bottom of the first mating block to detach from the top of the second mating block. Simultaneously, the third spring resets and pulls down the mating rod, transmission ring, connecting rod, and contact block. The top of the contact block detaches from the bottom of the first spring, thus breaking the circuit. After the shape memory metal cools, it deforms due to its properties. At this point, the fourth spring resets and pushes the second mating block upwards to contact the first mating block, allowing for continued reuse. This improves the practicality of the fuse tube, increases its service life, reduces costs, and offers the advantage of reusable fuse tubes.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a drop-out fuse, comprising a high-strength insulator, a protective plate fixedly mounted on the top of the high-strength insulator, a connector fixedly mounted on the top of the protective plate, a trunnion fixedly mounted on the bottom of the high-strength insulator, a collar joint fixedly mounted on the bottom of the trunnion, a contact piece fixedly mounted on the bottom of the protective plate, a first spring fixedly mounted on the bottom of the protective plate, a fuse tube assembly hinged to one side of the collar joint, a heat dissipation assembly movably sleeved on the outside of the fuse tube assembly, a contact assembly movably sleeved on the top of the fuse tube assembly, and a fixing assembly fixedly mounted on the bottom of the protective plate;

[0006] The fusion tube assembly includes a fusion tube, with guide grooves on the left and right sides of the inner wall of the fusion tube. A second docking block is movably sleeved inside the fusion tube. Gaskets are fixedly installed on the left and right sides of the second docking block. A connecting wire is fixedly installed in the middle of the bottom of the second docking block. A fourth spring is fixedly installed on the bottom of the second docking block outside the second docking block. Memory metal is fixedly installed on the bottom of the second docking block outside the fourth spring. A lower contact block is fixedly installed on the bottom of the fusion tube.

[0007] Preferably, the contact assembly includes a limiting ring, which is fixedly installed on the inner wall of the molten tube. A connecting rod is movably sleeved inside the limiting ring. A first connecting block is fixedly installed at the bottom of the connecting rod. A transmission ring is fixedly installed at the top of the connecting rod. Sliding blocks are fixedly installed on the left and right sides of the transmission ring, respectively. A connecting rod is fixedly installed at the top of the transmission ring. A contact block is fixedly installed at the top of the connecting rod. A fixing groove is opened at the top of the contact block. Limiting grooves are opened on the left and right sides of the inner wall of the molten tube. A third spring is fixedly installed at the bottom of the transmission ring.

[0008] Preferably, the heat dissipation assembly includes a docking ring that is movably sleeved with a fusible tube. Heat dissipation holes are provided on the left and right sides of the middle part of the fusible tube. A second support rod is hinged to the top of the heat dissipation hole, and a first support rod is hinged to the inner wall of the second support rod.

[0009] Preferably, the fixing assembly includes a connecting plate, which is fixedly installed to the bottom of the protective plate. A drive shaft is movably sleeved in the middle of the connecting plate. A limit block is fixedly installed on one side of the drive shaft. A second spring is fixedly sleeved on the outside of the drive shaft. A push plate is fixedly installed on the bottom of the drive shaft on one side of the connecting plate. A locking block is movably sleeved on one side of the drive shaft. A push block is fixedly installed on the other side of the drive shaft. Second holes are respectively opened at the front and rear ends inside the locking block. Spring telescopic cylinders are respectively fixedly installed at the front and rear ends inside the locking block. Locking blocks are respectively fixedly installed on the outer side of the spring telescopic cylinders. Sealing covers are respectively fixedly installed on the inner side of the locking blocks. First holes are respectively opened on the front and rear sides of the locking block.

[0010] Preferably, the connecting wire is spiral-shaped, the inner diameter of the connecting wire gradually decreases from top to bottom, and an insulating layer is provided on the outside of the connecting wire.

[0011] Preferably, the guide groove is U-shaped, the top of the guide groove is connected to the inside of the molten tube, the gasket is movably engaged inside the guide groove, and the gasket is made of rubber.

[0012] Preferably, the top of the second docking block is provided with a circular groove, which is adapted to the first docking block. The sliding block is slidably engaged inside the limiting groove. The bottom of the third spring is fixedly connected to the top of the limiting ring, and the top of the third spring is fixedly connected to the bottom of the transmission ring. The connecting rod is movably sleeved on the top of the fusion tube.

[0013] Preferably, the docking ring is slidably engaged inside the heat dissipation hole, the bottom of the first support rod is hinged to the left and right ends of the top of the docking ring, the second support rod is adapted to the heat dissipation hole, and the heat dissipation hole is kept horizontal with the shape memory metal.

[0014] Preferably, the top of the connecting wire, the shape memory metal, and the fourth spring are respectively fixedly connected to the bottom of the second docking block, and the bottom of the connecting wire, the shape memory metal, and the fourth spring are respectively fixedly connected to the bottom of the inside of the fusion tube, and the elastic coefficient of the fourth spring is greater than that of the third spring.

[0015] Preferably, the fixing groove is T-shaped, the pushing block is in contact with the inner wall of the snap-fit ​​block, the sealing cover is corrugated, and the interior of the sealing cover is connected to the interior of the snap-fit ​​block.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention achieves the purpose of cyclic use of the fuse tube by incorporating a fourth spring, a second docking block, and shape memory metal. When a short circuit occurs, the circuit current overload generates a high temperature, causing the temperature inside the fuse tube to rise instantaneously. The shape memory metal, when heated, will revert to its original position and contract. Since the top of the shape memory metal is fixedly connected to the bottom of the second docking block, it will pull the second docking block downwards, causing the bottom of the first docking block to detach from the top of the second docking block. Simultaneously, the third spring will reset and pull down the docking rod, transmission ring, connecting rod, and contact block. The top of the contact block will detach from the bottom of the first spring, thus breaking the circuit. After the shape memory metal cools down, it will deform according to its properties. At this time, the fourth spring will reset and push the second docking block upwards to contact the first docking block, allowing for continued cyclic use. This improves the practicality of the fuse tube, extends its service life, and reduces costs, thereby achieving the effect of cyclic use of the fuse tube.

[0018] This invention achieves the purpose of fixing the fusible tube by setting up a snap-fit ​​block, a push block, and a drive shaft. By pushing the fusible tube upward, it will rotate around the collar joint as the central axis. When the contact block rotates to the top, the snap-fit ​​block will snap into the inside of the fixing groove. At the same time, the contact block will push the drive shaft to the left and stretch the second spring. When the drive shaft and the push block are pushed, the push block slides to the right inside the snap-fit ​​block and compresses the gas inside the snap-fit ​​block. The gas enters the front and rear ends of the snap-fit ​​block through the second hole. The gas will push the snap-fit ​​block to the left and right ends respectively. At the same time, the spring telescopic cylinder will be stretched. The two snap-fit ​​blocks will be located inside the fixing groove and fix the contact block. Then, the contact piece applies downward pressure to fix the fusible tube. This effectively prevents the fusible tube from falling off the bottom of the first spring due to excessive outdoor wind, thereby preventing the circuit from breaking and achieving the effect of fixing the fusible tube.

[0019] This invention achieves convenient cooling by incorporating a docking ring, heat dissipation holes, and a second support rod. When the fusible tube falls off the bottom of the first spring, the internal temperature of the fusible tube is high, allowing for circuit maintenance. By pushing the docking ring upwards and simultaneously pushing the second support rod downwards via the first support rod, the second support rod rotates around the hinge point, causing the lower ends of the two second support rods to open outwards. During this opening process, the heat dissipation holes open, allowing heat to be dissipated from the inside of the fusible tube. This opening of the fusible tube improves the heat dissipation efficiency of the shape memory metal. Once the shape memory metal has completely dissipated heat, it hardens, allowing the second docking block to be pushed upwards via the fourth spring, resetting the docking rod, connecting rod, and contact block, enabling continued use and thus achieving the desired cooling effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall appearance of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the structural assembly of the present invention;

[0022] Figure 3 This is a front cross-sectional view of the structure of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the fusible tube assembly of the present invention;

[0024] Figure 5 This is a schematic diagram of the external appearance of the structural fixing component of the present invention;

[0025] Figure 6 The structure of this invention Figure 5 Enlarged view of point A;

[0026] Figure 7 This is a schematic diagram of the assembly of the contact assembly and the fuse tube assembly of the present invention;

[0027] Figure 8 This is a schematic diagram of the assembly of the fusible tube assembly and the heat dissipation assembly of the present invention.

[0028] In the diagram: 1. High-strength insulator; 2. Connector; 3. Fixing assembly; 301. Connecting plate; 302. Drive shaft; 303. Limiting block; 304. Second spring; 305. Pushing plate; 306. Snap-fit ​​block; 307. Sealing cover; 308. Snap-fit ​​block; 309. First hole; 311. Spring telescopic cylinder; 312. Second hole; 313. Pushing block; 4. Protective plate; 5. Contact piece; 6. Contact assembly; 601. Limiting ring; 602. Third spring; 603. Limiting groove; 604. First mating block; 605. 606. Connecting rod; 607. Transmission ring; 608. Sliding block; 609. Connecting rod; 610. Contact block; 7. Fixing groove; 701. Fusion tube assembly; 702. Fusion tube; 703. Lower contact block; 704. Second connecting block; 705. Connecting wire; 706. Shape memory metal; 707. Fourth spring; 708. Washer; 709. Guide groove; 800. Heat dissipation assembly; 801. Connecting ring; 802. First support rod; 803. Second support rod; 804. Heat dissipation hole; 9. Collar joint; 10. Trunnion; 11. First spring. 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] like Figures 1 to 8As shown, the present invention provides a drop-out fuse, including a high-strength insulator 1, a protective plate 4 fixedly installed on the top of the high-strength insulator 1, a connector 2 fixedly installed on the top of the protective plate 4, a trunnion 10 fixedly installed on the bottom of the high-strength insulator 1, a collar joint 9 fixedly installed on the bottom of the trunnion 10, a contact piece 5 fixedly installed on the bottom of the protective plate 4, a first spring 11 fixedly installed on the bottom of the protective plate 4, a fuse tube assembly 7 hinged to one side of the collar joint 9, a heat dissipation assembly 8 movably sleeved on the outside of the fuse tube assembly 7, a contact assembly 6 movably sleeved on the top of the fuse tube assembly 7, and a fixing assembly 3 fixedly installed on the bottom of the protective plate 4.

[0031] The fusible tube assembly 7 includes a fusible tube 701. Guide grooves 708 are respectively opened on the left and right sides of the inner wall of the fusible tube 701. A second docking block 703 is movably sleeved inside the fusible tube 701. Gaskets 707 are fixedly installed on the left and right sides of the second docking block 703. A connecting wire 704 is fixedly installed in the middle of the bottom of the second docking block 703. A fourth spring 706 is fixedly installed on the bottom of the second docking block 703 outside the second docking block 703. A memory metal 705 is fixedly installed on the bottom of the second docking block 703 outside the fourth spring 706. A lower contact block 702 is fixedly installed on the bottom of the fusible tube 701.

[0032] The contact assembly 6 includes a limiting ring 601, which is fixedly installed on the inner wall of the fusible tube 701. A connecting rod 605 is movably sleeved inside the limiting ring 601. A first connecting block 604 is fixedly installed at the bottom of the connecting rod 605. A transmission ring 606 is fixedly installed at the top of the connecting rod 605. Sliding blocks 607 are fixedly installed on the left and right sides of the transmission ring 606, respectively. A connecting rod 608 is fixedly installed at the top of the transmission ring 606. A contact block 609 is fixedly installed at the top of the connecting rod 608. A fixing groove 610 is opened at the top of the contact block 609. Limiting grooves 603 are opened on the left and right sides of the inner wall of the fusible tube 701. A third spring 602 is fixedly installed at the bottom of the transmission ring 606.

[0033] The above solution works as follows: When a short circuit occurs, the circuit current overload generates a high temperature. At this time, the temperature inside the fuse 701 will rise instantaneously. When the shape memory metal 705 is heated, it will reset and spirally contract. Since the top of the shape memory metal 705 is fixedly connected to the bottom of the second docking block 703, it will pull the second docking block 703 downward, causing the bottom of the first docking block 604 to disengage from the top of the second docking block 703. At the same time, the third spring 602 will reset and pull the docking rod 605, the transmission ring 606, the connecting rod 608, and the contact block 6 downward. 09. The top of the contact block 609 will disengage from the bottom of the first spring 11, thus breaking the circuit. As the second docking block 703 moves downward, one end of the pad 707 is pushed downward and slides inside the guide groove 708. The top of the pad 707 will be pushed out, and the tops of the two pads 707 will be located between the second docking block 703 and the first docking block 604 respectively. Since the pad 707 is made of rubber, it isolates the second docking block 703 from the first docking block 604, thus effectively breaking the circuit.

[0034] After the shape memory metal 705 cools down, it will deform according to its characteristics. At this time, the fourth spring 706 will reset and push the second docking block 703 upward to contact the first docking block 604, so that it can continue to be used in a cycle, thereby reducing the cost of replacing the fuse tube 701 and improving the efficiency of circuit maintenance.

[0035] like Figure 2 , Figure 3 , Figure 4 , Figure 8 As shown, the heat dissipation assembly 8 includes a docking ring 801, which is movably sleeved with the fusible tube 701. Heat dissipation holes 804 are provided on the left and right sides of the middle part of the fusible tube 701. A second support rod 803 is hinged to the top of the heat dissipation hole 804. A first support rod 802 is hinged to the inner wall of the second support rod 803. The docking ring 801 is slidably engaged inside the heat dissipation hole 804. The bottom of the first support rod 802 is hinged to the left and right ends of the top of the docking ring 801. The second support rod 803 is adapted to the heat dissipation hole 804. The heat dissipation hole 804 is kept horizontal with the shape memory metal 705.

[0036] The above solution involves the following steps: When the fuse tube 701 falls off the bottom of the first spring 11, the internal temperature of the fuse tube 701 is high, allowing for circuit maintenance. By pushing the docking ring 801 upwards and pushing the second support rod 803 downwards via the first support rod 802, the second support rod 803 rotates around the hinge point, causing the lower ends of the two second support rods 803 to open outwards. During this opening process, the heat dissipation hole 804 opens, allowing heat to be dissipated from the inside of the fuse tube 701. This opening improves the heat dissipation efficiency of the shape memory metal 705. After the shape memory metal 705 has completely dissipated heat, it becomes rigid, allowing the second docking block 703 to be pushed upwards via the fourth spring 706. This resets the docking rod 605, connecting rod 608, and contact block 609, enabling continued use. This reduces the cost of replacing the fuse tube 701 and improves the efficiency of circuit maintenance.

[0037] like Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the fixing component 3 includes a connecting plate 301, which is fixedly installed on the bottom of the protective plate 4. A drive shaft 302 is movably sleeved in the middle of the connecting plate 301. A limit block 303 is fixedly installed on one side of the drive shaft 302. A second spring 304 is fixedly sleeved on the outside of the drive shaft 302. A push plate 305 is fixedly installed on the bottom of the drive shaft 302 on one side of the connecting plate 301. A locking block 306 is movably sleeved on one side of the drive shaft 302. A push block 313 is fixedly installed on the other side of the drive shaft 302. Second holes 312 are respectively opened at the front and rear ends of the locking block 306. Spring telescopic cylinders 311 are fixedly installed at the front and rear ends of the locking block 306. Locking blocks 308 are fixedly installed on the outside of the spring telescopic cylinders 311. Sealing covers 307 are fixedly installed on the inside of the locking blocks 308. First holes 309 are respectively opened on the front and rear sides of the locking block 306.

[0038] Using the above scheme: When the shape memory metal 705 is in a cooled state, the fourth spring 706 pushes the second docking block 703 upward, so that the top of the second docking block 703 contacts the bottom of the first docking block 604, and pushes the transmission ring 606, sliding block 607, connecting rod 608 and contact block 609 upward. The sliding block 607 will slide inside the limiting groove 603, and the limiting groove 603 will limit the connecting rod 608 and contact block 609. At the same time, the third spring 602 will be stretched, and by pushing the flipping molten tube 701 upward, the molten tube 701 will rotate around the collar joint 9 as the central axis. When the contact block 609 rotates to the top, the locking block 306 will lock into the inside of the fixing groove 610. At the same time, the contact block 609 will push the transmission ring 606 upward. When shaft 302 moves to the left and stretches the second spring 304, and at the same time, when the drive shaft 302 and the push block 313 are pushed, the push block 313 slides to the right inside the locking block 306 and squeezes the gas inside the locking block 306. The gas enters the front and rear ends of the locking block 306 through the second hole 312. The gas will push the locking block 308 to move to the left and right ends respectively. At the same time, the spring telescopic cylinder 311 will be stretched. The two locking blocks 308 will be located inside the fixing groove 610 and fix the contact block 609. Then, the contact piece 5 applies downward pressure to fix the fuse tube 701, effectively preventing the fuse tube 701 from falling off the bottom of the first spring 11 due to excessive outdoor wind force, which would cause a short circuit.

[0039] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 As shown, the connecting line 704 is spiral-shaped, and the inner diameter of the connecting line 704 gradually decreases from top to bottom. An insulating layer is provided on the outside of the connecting line 704. The guide groove 708 is U-shaped, and the top of the guide groove 708 is connected to the inside of the melt tube 701. The gasket 707 is movably engaged in the inside of the guide groove 708. The gasket 707 is made of rubber. The top of the second docking block 703 has a circular groove that matches the first docking block 604. The sliding block 607 is slidably engaged in the inside of the limiting groove 603. The bottom of the third spring 602 is fixedly connected to the top of the limiting ring 601. The top of the third spring 602 is fixedly connected to the bottom of the transmission ring 606. The connecting rod 608 is movably sleeved on the top of the melt tube 701.

[0040] The tops of the connecting wire 704, the shape memory metal 705, and the fourth spring 706 are fixedly connected to the bottom of the second docking block 703, and the bottoms of the connecting wire 704, the shape memory metal 705, and the fourth spring 706 are fixedly connected to the bottom of the inside of the fusible tube 701. The elastic coefficient of the fourth spring 706 is greater than that of the third spring 602.

[0041] The above solution works as follows: When the circuit is short-circuited, the circuit current load is too large, which will generate a lot of heat. At this time, the memory metal 705 will be heated and reset, shrinking in a spiral shape, and pulling the second docking block 703 downward. The fourth spring 706 will be compressed, and the second docking block 703 will disengage from the bottom of the first docking block 604. At the same time, the connecting line 704 will shrink in a spiral shape. During the downward movement of the second docking block 703, one end of the pad 707 will be pushed downward and slide inside the guide groove 708. The top of the pad 707 will be pushed out, and the tops of the two pads 707 will be located between the second docking block 703 and the first docking block 604, respectively. Since the pad 707 is made of rubber, it isolates the second docking block 703 and the first docking block 604, thereby effectively disconnecting the circuit.

[0042] like Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 As shown, the fixing groove 610 is T-shaped, the pushing block 313 contacts the inner wall of the snap-fit ​​block 306, the sealing cover 307 is corrugated, and the interior of the sealing cover 307 is connected to the interior of the snap-fit ​​block 306.

[0043] Using the above solution: when the contact block 609 moves downward, the snap-fit ​​block 306 will disengage from the inside of the fixing groove 610. At this time, the second spring 304 will reset and push the contact block 609 to rotate around the collar joint 9 as the central axis through the push plate 305. Under the thrust of the second spring 304 and the guidance of the weight of the fuse tube 701 itself, the top of the contact block 609 will disengage from the bottom of the first spring 11, thereby achieving drop disconnection and effectively avoiding excessive elasticity of the contact piece 5, which would prevent the fuse tube 701 from disengaging.

[0044] Working principle and usage process of this invention:

[0045] First, connector 2 is connected to the circuit. The shape memory metal 705 is in a cooled state. The fourth spring 706 pushes the second mating block 703 upwards, causing the top of the second mating block 703 to contact the bottom of the first mating block 604. This pushes upwards the transmission ring 606, sliding block 607, connecting rod 608, and contact block 609. By pushing the fusible tube 701 upwards, the fusible tube 701 rotates around the collar connector 9 as its central axis. When the contact block 609 rotates to its top, the locking block 306 engages inside the fixing groove 610. Simultaneously, the contact block 609 pushes the transmission shaft 302 to the left and stretches the second spring 304. At the same time, when the drive shaft 302 and the push block 313 are pushed, the push block 313 slides to the right end inside the snap block 306 and squeezes the gas inside the snap block 306. The gas enters the front and rear ends of the snap block 306 through the second hole 312. The gas will push the snap block 308 to move to the left and right ends respectively. At the same time, the spring telescopic cylinder 311 will be stretched. The two snap blocks 308 will be located inside the fixing groove 610 and fix the contact block 609. Then, the contact piece 5 applies downward pressure to fix the fuse tube 701, so as to prevent the fuse tube 701 from falling off the bottom of the first spring 11 due to excessive outdoor wind.

[0046] When a short circuit occurs in the circuit, the current overload will generate a high temperature. At this time, the temperature inside the fuse 701 will rise instantaneously. When the shape memory metal 705 is heated, it will reset and contract. Since the top of the shape memory metal 705 is fixedly connected to the bottom of the second docking block 703, it will pull the second docking block 703 downward, causing the bottom of the first docking block 604 to disengage from the top of the second docking block 703. At the same time, the third spring 602 will reset and pull the docking rod 605, the transmission ring 606, the connecting rod 608, and the contact block 609 downward. The top of 09 will disengage from the bottom of the first spring 11, thus breaking the circuit. As the second docking block 703 moves downward, one end of the pad 707 is pushed downward and slides inside the guide groove 708. The top of the pad 707 will be pushed out, and the tops of the two pads 707 will be located between the second docking block 703 and the first docking block 604 respectively. Since the pad 707 is made of rubber, it effectively separates the second docking block 703 from the first docking block 604, thus breaking the circuit.

[0047] When the contact block 609 moves downward, the snap-fit ​​block 306 will disengage from the inside of the fixing groove 610. At this time, the second spring 304 will reset and push the contact block 609 to rotate around the collar joint 9 as the central axis through the push plate 305. Under the thrust of the second spring 304 and the guidance of the gravity of the fuse tube 701, the top of the contact block 609 will disengage from the bottom of the first spring 11, thereby achieving drop disconnection.

[0048] Simultaneously, when the fuse tube 701 falls off the bottom of the first spring 11, the internal temperature of the fuse tube 701 is high. At this time, the circuit can be inspected. At the same time, by pushing the docking ring 801 upward, and pushing the second support rod 803 downward through the first support rod 802, the second support rod 803 rotates around the hinge as the central axis, causing the lower ends of the two second support rods 803 to open outward. During the opening process, the heat dissipation hole 804 will open, and heat will be dissipated from the inside of the fuse tube 701 through the heat dissipation hole 804. The inside of the fuse tube 701 will be opened, thereby improving the heat dissipation efficiency of the shape memory metal 705. After the shape memory metal 705 has dissipated heat, the shape memory metal 705 will lose its rigidity. At this time, the fourth spring 706 will return to its original position, and the second docking block 703 and the first docking block 604 can be pushed upward, as well as the transmission ring 606, the connecting rod 608 and the contact block 609, so that it can continue to be used.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] 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 drop-out fuse, comprising a high-strength insulator (1), a protective plate (4) fixedly mounted on the top of the high-strength insulator (1), a connector (2) fixedly mounted on the top of the protective plate (4), a trunnion (10) fixedly mounted on the bottom of the high-strength insulator (1), a collar connector (9) fixedly mounted on the bottom of the trunnion (10), a contact piece (5) fixedly mounted on the bottom of the protective plate (4), and a first spring (11) fixedly mounted on the bottom of the protective plate (4), characterized in that: The collar connector (9) is hinged to one side with a fusion tube assembly (7), the fusion tube assembly (7) is movably sleeved with a heat dissipation assembly (8), the top of the fusion tube assembly (7) is movably sleeved with a contact assembly (6), and the bottom of the protective plate (4) is fixedly installed with a fixing assembly (3). The fusible tube assembly (7) includes a fusible tube (701). Guide grooves (708) are respectively opened on the left and right sides of the inner wall of the fusible tube (701). A second docking block (703) is movably sleeved inside the fusible tube (701). Gaskets (707) are respectively fixedly installed on the left and right sides of the second docking block (703). A connecting line (704) is fixedly installed in the middle of the bottom of the second docking block (703). A fourth spring (706) is fixedly installed outside the connecting line (704) at the bottom of the second docking block (703). A memory metal (705) is fixedly installed outside the fourth spring (706) at the bottom of the second docking block (703). A lower contact block (702) is fixedly installed at the bottom of the fusible tube (701). The contact assembly (6) includes a limiting ring (601), which is fixedly installed on the inner wall of the fusion tube (701). A connecting rod (605) is movably sleeved inside the limiting ring (601). A first connecting block (604) is fixedly installed at the bottom of the connecting rod (605). A transmission ring (606) is fixedly installed at the top of the connecting rod (605). Sliding blocks (607) are fixedly installed on the left and right sides of the transmission ring (606). A connecting rod (608) is fixedly installed at the top of the transmission ring (606). A contact block (609) is fixedly installed at the top of the connecting rod (608). A fixing groove (610) is opened at the top of the contact block (609). Limiting grooves (603) are opened on the left and right sides of the inner wall of the fusion tube (701). A third spring (602) is fixedly installed at the bottom of the transmission ring (606). The second docking block (703) has a circular groove at its top, which is adapted to the first docking block (604). The sliding block (607) is slidably engaged inside the limiting groove (603). The bottom of the third spring (602) is fixedly connected to the top of the limiting ring (601). The top of the third spring (602) is fixedly connected to the bottom of the transmission ring (606). The connecting rod (608) is movably sleeved on the top of the fusion tube (701). The guide groove (708) is U-shaped, and the top of the guide groove (708) is connected to the inside of the fusion tube (701). The gasket (707) is movably engaged inside the guide groove (708) and is made of rubber.

2. A drop-out fuse according to claim 1, characterized in that: The heat dissipation assembly (8) includes a docking ring (801), which is movably connected to the fusion tube (701). Heat dissipation holes (804) are provided on the left and right sides of the middle part of the fusion tube (701). A second support rod (803) is hinged to the top of the heat dissipation hole (804), and a first support rod (802) is hinged to the inner wall of the second support rod (803).

3. A drop-out fuse according to claim 2, characterized in that: The docking ring (801) is slidably engaged inside the heat dissipation hole (804), the bottom of the first support rod (802) is hinged to the left and right ends of the top of the docking ring (801), and the second support rod (803) is adapted to the heat dissipation hole (804).

4. A drop-out fuse according to claim 1, characterized in that: The fixing component (3) includes a connecting plate (301), which is fixedly installed at the bottom of the protective plate (4). A drive shaft (302) is movably sleeved in the middle of the connecting plate (301). A limit block (303) is fixedly installed on one side of the drive shaft (302). A second spring (304) is fixedly sleeved on the outside of the drive shaft (302). A push plate (305) is fixedly installed at the bottom of the drive shaft (302) on one side of the connecting plate (301). A retaining plate (304) is movably sleeved on one side of the drive shaft (302). The connecting block (306) has a push block (313) fixedly installed on the other side of the drive shaft (302). The front and rear ends of the connecting block (306) are respectively provided with second holes (312). The front and rear ends of the connecting block (306) are respectively fixedly installed with spring telescopic cylinders (311). The outer side of the spring telescopic cylinders (311) is respectively fixedly installed with a locking block (308). The inner side of the locking block (308) is respectively fixedly installed with a sealing cover (307). The front and rear sides of the connecting block (306) are respectively provided with first holes (309).

5. A drop-out fuse according to claim 4, characterized in that: The fixing groove (610) is T-shaped, the pushing block (313) is in contact with the inner wall of the snap-fit ​​block (306), the sealing cover (307) is corrugated, and the interior of the sealing cover (307) is connected to the interior of the snap-fit ​​block (306).

6. A drop-out fuse according to claim 1, characterized in that: The connecting line (704) is spiral-shaped, and the inner diameter of the connecting line (704) gradually decreases from top to bottom. An insulating layer is provided on the outside of the connecting line (704).

7. A drop-out fuse according to claim 1, characterized in that: The tops of the connecting line (704), the shape memory metal (705), and the fourth spring (706) are fixedly connected to the bottom of the second docking block (703), and the bottoms of the connecting line (704), the shape memory metal (705), and the fourth spring (706) are fixedly connected to the bottom of the inside of the fusion tube (701). The elastic coefficient of the fourth spring (706) is greater than that of the third spring (602).

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