A carrier fuse for use in a drop-out fuse

Abstract

The application relates to a carrier fuse element used in a drop-out fuse, belonging to the technical field of power protection equipment, which comprises a fuse tube, a rotating element and a connecting frame, the two ends of the fuse tube are respectively fixedly provided with upper and lower conductive sleeves, the outer circumferential surface of the lower conductive sleeve is fixedly provided with rotating plates side by side, and one side of the connecting frame is provided with a supporting frame; a protruding block between the two rotating plates is fixedly arranged on the side of the connecting frame far from the supporting frame, and the side of the two rotating plates far from each other is rotationally connected with the protruding block through the rotating element; the protruding block is provided with an elastic element, the elastic element can enable the lower conductive sleeve to have rotating force in the direction of the supporting frame; when the fuse encounters current overload, the fuse wire in the fuse tube is fused, the fuse tube loses support, at this moment, the rotating force provided by the elastic element and the gravity of the fuse tube jointly act, so that the fuse tube can quickly drop in the direction of the supporting frame.

Description

Technical Field

[0001] This application relates to the technical field of power protection equipment, and in particular to a fuse carrier for use in a drop-out fuse. Background Technology

[0002] Currently, drop-out fuses are the core protection equipment in 10kV and below power distribution lines, and are widely used in transformers, line sectionalizing switches and other scenarios, undertaking the key task of overload and short circuit protection. Their design principle is based on the fuse blowing to trigger the fuse tube to drop, which quickly cuts off the fault current through physical disconnection, while forming a clear isolation point to provide a safe environment for maintenance work. With its advantages of simple structure, low cost and convenient maintenance, this device has become the "first line of defense" to ensure the safe operation of the power grid.

[0003] In related technologies, utility model patent with publication number CN222734920U discloses a drop-out fuse, including a fuse tube and an insulating porcelain insulator. An upper conductive sleeve and a lower conductive sleeve are fixed at both ends of the fuse tube. A connecting frame is hinged to the outer periphery of the lower conductive sleeve, and a fixed shaft is fixed to the connecting frame. An upper support and a lower support are fixed at both ends of the insulating porcelain insulator. A stationary contact piece that abuts against the upper conductive sleeve is fixed to the upper support, and a placement notch for inserting the fixed shaft is provided on the lower support. A release hook is hinged to the outer periphery of the lower conductive sleeve via a rotating shaft, and a torsion spring for engaging the release hook with the outer periphery of the fixed shaft is sleeved on the rotating shaft. The fuse tube contains a pusher for unlocking the release hook and a fuse wire for controlling the pusher. An abutment plate is fixed to the outer periphery of the lower conductive sleeve, and an elastic conductive sheet is fixed to the abutment plate. A conductive protrusion that abuts against the elastic conductive sheet is fixed to the connecting frame.

[0004] When an overload or short circuit occurs in the circuit, the current will increase rapidly, exceeding the fuse's carrying capacity limit, causing the fuse to melt and the fuse tube to rotate downwards around the rotating connection of the lower conductive sleeve and the connecting frame. However, the above-mentioned drop-out fuses are usually placed in harsh environments at high altitudes. Because the rotating parts of the conductive sleeve and the connecting frame are exposed to sunlight, rain, and temperature changes for a long time, the lubricating grease will age and fail or the metal parts will rust, which will significantly increase the rotational resistance of the fuse tube. This will make it rotate downwards at a lower speed by its own weight, affecting the arc extinguishing speed when breaking the fuse. Sometimes, the automatic gravity is insufficient, and the fuse tube cannot drop in segments immediately, which may cause a secondary short circuit. There is room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a fusible element for a drop-out fuse, which solves the problem in the above-mentioned related technologies where corrosion of the rotating parts of the conductive sleeve and connector leads to a low speed at which the fuse rotates downwards under its own weight.

[0006] This application provides a fusible link for a drop-out fuse, which adopts the following technical solution: A fusible link for use in a drop-out fuse includes a fusible tube, a rotating component, and a connecting frame. An upper conductive sleeve and a lower conductive sleeve are fixed to both ends of the fusible tube. Rotating plates are fixed side-by-side on the outer circumferential surface of the lower conductive sleeve. A support frame is provided on one side of the connecting frame. A protrusion block located between the two rotating plates is fixed to the side of the connecting frame away from the support frame. The sides of the two rotating plates that are close to each other are rotatably connected to the protrusion block via the rotating component. An elastic element is provided on the protrusion block, which enables the lower conductive sleeve to rotate towards the support frame.

[0007] By adopting the above technical solution, an elastic element is set on the protruding block to give the lower conductive sleeve a rotational force towards the support frame. When the fuse encounters an overload, the fuse wire in the fuse tube melts, and the fuse tube loses its support. At this time, the rotational force provided by the elastic element and the weight of the fuse tube itself work together to cause the fuse tube to fall quickly towards the support frame. This design effectively accelerates the falling speed of the fuse tube, thereby quickly cutting off the circuit and greatly improving the arc extinguishing speed. This allows the drop-out fuse to play a more efficient protective role when facing circuit faults, ensuring the safe and stable operation of the power system.

[0008] Optionally, the protrusion is provided with a positioning boss on the side of the protrusion near the two rotating plates. The elastic element is a torsion spring sleeved on the outer circumferential surface of the positioning boss. The two ends of the torsion spring are respectively provided with a first fixing rod fixedly connected to the rotating plate and a second fixing rod fixedly connected to the positioning boss.

[0009] By adopting the above technical solution, when the fuse tube is activated, the torsion spring can provide a stable and reliable rotational force to the lower conductive sleeve by virtue of its own elastic characteristics, ensuring that the fuse tube falls quickly. This design has a simple structure and is easy to install, effectively improving the sensitivity and reliability of the fuse element's operation and enhancing the protection performance of the drop-out fuse.

[0010] Optionally, the fusion tube has an arc-shaped notch on its outer circumferential surface near the lower conductive sleeve, the lower conductive sleeve has a fixed through hole that can communicate with and overlap with the inner wall of the arc-shaped notch, and the fusion tube has a fixing pin on its outside that can be simultaneously embedded in the fixed through hole and the arc-shaped notch.

[0011] By adopting the above technical solution, this structure makes the assembly and disassembly of the fusible tube and the lower conductive sleeve more convenient. When it is necessary to repair or replace the fusible tube, it can be quickly separated by simply pulling out the fixing pin, thus improving maintenance efficiency.

[0012] Optionally, the rotating component is a guide rod, and the end of the protrusion near the rotating plate is provided with a fixed through hole for the guide rod to pass through. Both rotating plates are provided with locking through holes for the guide rod to pass through. A fixing ring and a fixing cap are respectively fixed on the outer circumferential surface of both ends of the guide rod, and the sides of the fixing ring and the fixing cap that are close to each other abut against the sides of the two rotating plates that are far apart from each other.

[0013] By adopting the above technical solution, this design not only ensures the stability of the connection between the various components of the carrier, effectively preventing loosening or displacement during rotation, and guaranteeing the accuracy and stability of rotation; but also has a simple structure, is easy to install, and facilitates subsequent inspection and maintenance.

[0014] Optionally, a guide ring is slidably provided on the outer circumferential surface of the fusion tube, a cleaning cotton is fixed on the inner wall of the guide ring, and an insulating pull ring is fixed on the guide ring for the operator to drive the guide ring to move back and forth along the axis of the fusion tube.

[0015] By adopting the above technical solution, the cleaning cotton can wipe and clean the surface of the fusion tube when the guide ring moves, effectively removing dust, dirt and other impurities, and avoiding problems such as heat dissipation being affected or partial discharge caused by dirt on the surface of the fusion tube; at the same time, the design of the insulating pull ring facilitates safe operation by the staff, reduces the risk of electric shock, and improves the convenience and safety of operation.

[0016] Optionally, a positioning block facing the upper conductive sleeve is fixed on the outer peripheral surface of the lower conductive sleeve, and a clearance notch is provided on the side of the guide ring near the lower conductive sleeve for the positioning block to be inserted and fixed.

[0017] By adopting the above technical solution, this design can not only prevent the guide ring from sliding randomly in the non-operating state, avoiding the cleaning cotton from being worn by the molten tube or affecting the cleaning effect due to the shaking of the guide ring, but also ensure the installation stability between the lower conductive sleeve and the guide ring.

[0018] Optionally, two fixing plates facing the lower conductive sleeve are fixedly disposed on the outer peripheral surface of the guide ring. The fixing plates are elastically deformable and can be reset. A fixing block is fixed on the side of the two fixing plates that are close to each other. A locking groove is provided on the outer peripheral surface of the lower conductive sleeve. The fixing block can be embedded in the locking groove when the positioning block is inserted into the clearance notch.

[0019] By adopting the above technical solution, this design further enhances the fixing effect of the guide ring, effectively preventing it from moving accidentally due to external force or vibration, ensuring that the cleaning cotton is stably in the right position, and guaranteeing the reliability of the cleaning work; moreover, the elastic fixing plate is easy to operate, and when the staff moves the guide ring, the fixing block can smoothly move in and out of the locking groove with the deformation of the fixing plate.

[0020] Optionally, a guide slope is provided on the side edge of the fixing block away from the guide ring.

[0021] By adopting the above technical solution, when the staff moves the guide ring to bring the fixing block closer to the locking groove, the guide slope can play a guiding role, allowing the fixing block to slide smoothly into the locking groove along the slope; when it is necessary to disassemble or move the guide ring, the guide slope can also reduce the jamming between the fixing block and the lower conductive sleeve, making it easier for the fixing block to come out of the locking groove.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. An elastic element is provided on the protruding block to give the lower conductive sleeve a rotational force towards the support frame. When the fuse encounters an overload, the fuse wire in the fuse tube melts, and the fuse tube loses its support. At this time, the rotational force provided by the elastic element and the weight of the fuse tube itself work together to cause the fuse tube to fall quickly towards the support frame. This design effectively accelerates the falling speed of the fuse tube, thereby quickly cutting off the circuit and greatly improving the arc extinguishing speed. This allows the drop-out fuse to play a more efficient protective role when facing circuit faults, ensuring the safe and stable operation of the power system. 2. The cleaning cotton can wipe and clean the surface of the fusion tube as the guide ring moves, effectively removing dust, dirt and other impurities, and avoiding problems such as heat dissipation being affected or partial discharge caused by dirt on the surface of the fusion tube; at the same time, the design of the insulating pull ring facilitates safe operation by the staff, reduces the risk of electric shock, and improves the convenience and safety of operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a cross-sectional structural diagram illustrating the mounting and mating of the positioning boss and the torsion spring in Embodiment 1 of this application; Figure 3 This is a partially enlarged schematic diagram illustrating the first and second fixing rods in Embodiment 1 of this application; Figure 4 This is an exploded structural diagram illustrating the installation and cooperation of the fixing pin and the lower conductive sleeve in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the overall structure of Embodiment 2 of this application; Figure 6This is an exploded structural diagram illustrating the installation and assembly of the guide ring and cleaning cotton in Embodiment 2 of this application; Figure 7 This is a cross-sectional view of Embodiment 2 of this application illustrating the installation and cooperation between the fixing block and the locking groove; Figure 8 yes Figure 7 A magnified view of part A in the diagram.

[0025] In the diagram, 1. Fusion tube; 11. Arc-shaped notch; 12. Fixing pin; 2. Rotating component; 21. Guide rod; 211. Fixing ring; 212. Fixing cap; 3. Connecting frame; 31. Support frame; 32. Protrusion block; 321. Positioning boss; 322. Fixing through hole; 4. Upper conductive sleeve; 5. Lower conductive sleeve; 51. Rotating plate; 52. Locking through hole; 53. Positioning block; 54. Locking groove; 55. Positioning through hole; 6. Elastic component; 61. Torsion spring; 611. First fixing rod; 612. Second fixing rod; 7. Guide ring; 71. Cleaning cotton; 72. Insulating pull ring; 73. Relief notch; 74. Fixing plate; 741. Fixing block; 7411. Guide slope. Detailed Implementation

[0026] The present application will be further described in detail below with reference to all the accompanying drawings.

[0027] Example 1: Reference Figure 1 A fusible element for use in a drop-out fuse includes a fusible tube 1, a rotating element 2 and a connecting frame 3. An upper conductive sleeve 4 and a lower conductive sleeve 5 are fixedly installed at both ends of the fusible tube 1, and two rotating plates 51 arranged side by side are integrally formed on the outer circumferential surface of the lower conductive sleeve 5. A support frame 31 is provided on the side of the connecting frame 3. The connecting frame 3 has an integrally formed protrusion 32 on the side away from the support frame 31, located between the two rotating plates 51. The sides of the two rotating plates 51 that are close to each other are rotatably connected to the protrusion 32 through the rotating member 2. An elastic member 6 is provided on the protrusion 32. When the fuse with the fusible link is used, the corresponding fuse is installed at an angle on the high-altitude utility pole. If the fuse encounters an overload, the fuse wire in the fuse tube 1 will melt quickly. At this time, the fuse tube 1 will fall quickly towards the support frame 31 under the combined action of its own weight and the elastic force of the elastic element 6, thereby effectively improving the arc extinguishing speed.

[0028] Reference Figure 2 and Figure 3 The protruding block 32 has a positioning boss 321 integrally formed on the side near the two rotating plates 51, and the elastic element 6 is a torsion spring 61 sleeved on the outer peripheral surface of the positioning boss 321, wherein the two ends of the torsion spring 61 are respectively integrally formed with a first fixing rod 611 and a second fixing rod 612. The first fixing rod 611 is fixedly connected to the side of the rotating plate 51, and the second fixing rod 612 is fixedly connected to the outer peripheral surface of the positioning boss 321. The torsion spring 61 can work with the gravity of the melting tube 1 to make the melting tube 1 fall quickly towards the support frame 31 and extinguish the arc. The installation method of the torsion spring 61 is convenient for the staff to replace.

[0029] Reference Figure 2 and Figure 4 The rotating part 2 is a guide rod 21, and the end of the protrusion 32 near the rotating plate 51 is provided with a fixing through hole 322 for the guide rod 21 to pass through and be fixed. At the same time, both rotating plates 51 are provided with positioning through holes 55 for the guide rod 21 to pass through. A fixing cap 212 is integrally formed on the outer circumferential surface of one end of the guide rod 21. After the guide rod 21 is installed and stabilized, the staff uses a professional riveting tool to rivet the other end of the guide rod 21 to form a fixing ring 211. At this time, the newly formed fixing ring 211 and the original fixing cap 212 of the guide rod 21 are close to each other and tightly abut against the sides of the two rotating plates 51 that are far apart from each other, forming an effective constraint mechanism to prevent the rotating plates 51 from loosening or shifting during operation.

[0030] Reference Figure 4 The fuse tube 1 has an arc-shaped notch 11 on its outer circumferential surface near the lower conductive sleeve 5. The lower conductive sleeve 5 has a locking through hole 52 that can communicate with and overlap with the inner wall of the arc-shaped notch 11. The fuse tube 1 has a fixing pin 12 on its outside that can be inserted into both the locking through hole 52 and the arc-shaped notch 11. When the fuse tube 1 falls due to current overload, the fixing pin 12 can prevent the fuse tube 1 from rotating or moving axially relative to the lower conductive sleeve 5, thus ensuring structural stability.

[0031] The implementation principle of this application embodiment is as follows: When the fuse with this fuse element is in use, the corresponding fuse is installed at an angle on the high-altitude utility pole; when the circuit where the fuse is located encounters an abnormal situation of current overload, the fuse wire in the fuse tube 1 will melt quickly due to the heat generated by the excessive current. At the moment the fuse breaks, the fuse tube 1 loses the support and fixation of the fuse. At this time, the fuse tube 1 will be pushed by its own weight and the elastic force provided by the torsion spring 61. The two work together to cause the fuse tube 1 to fall towards the support frame 31 at a relatively fast speed, thereby effectively improving the arc extinguishing speed.

[0032] Example 2: Reference Figure 5 and Figure 6The difference between this embodiment and Embodiment 1 is that a guide ring 7 is slidably disposed on the outer peripheral surface of the melt tube 1, wherein a cleaning cotton 71 for cleaning the outer surface of the melt tube 1 is fixedly installed on the inner wall of the guide ring 7, wherein the cleaning cotton 71 is made of sponge material, and an insulating pull ring 72 is integrally formed on the guide ring 7. In daily use, staff can use the link rod (that is, the vertical rod made of insulating material) to drive the guide ring 7 to move back and forth along the axis of the fuse tube 1 for cleaning. This ensures that the fuse tube 1 is not hindered by impurities when it falls due to current overload, thereby quickly extinguishing the arc and reducing danger.

[0033] Reference Figure 6 , Figure 7 and Figure 8 A positioning block 53 facing the upper conductive sleeve 4 is integrally formed on the outer peripheral surface of the lower conductive sleeve 5, and a clearance notch 73 is provided on the side of the guide ring 7 near the lower conductive sleeve 5 for the positioning block 53 to be inserted and fixed; a fixing plate 74 facing the lower conductive sleeve 5 is integrally formed on the outer peripheral surface of the guide ring 7, and a fixing block 741 is integrally formed on the side of the two fixing plates 74 that are close to each other. The fixing block 741 has a guide slope 7411 on its side edge away from the guide ring 7, and a locking groove 54 is provided on the outer periphery of the lower conductive sleeve 5. When the cleaning of the molten tube 1 is finished and it needs to be fixed, the staff can use a linker to move the molten tube 1 towards the lower conductive sleeve 5 until the positioning block 53 is inserted into the clearance notch 73. At the same time, when the positioning block 53 is inserted into the clearance notch 73, the fixing plate 74 will undergo moderate elastic deformation to provide buffer space for the fixing block 741 to be inserted. Once the positioning block 53 is fully engaged, the fixing plate 74 can quickly and elastically reset, allowing the fixing block 741 to be simultaneously engaged in the locking groove 54 under the guidance of the guide slope 7411, thus achieving a firm fixed connection between the guide ring 7 and the lower conductive sleeve 5.

[0034] The implementation principle of this application embodiment is as follows: When the fuse tube 1 needs to be cleaned during daily use, the staff uses a linker to drive the insulating pull ring 72 on the guide ring 7 to move back and forth along the axis of the fuse tube 1. During this process, the cleaning cotton 71 will wipe the outer surface of the fuse tube 1 to effectively remove any impurities that may be attached, thereby ensuring that the fuse tube 1 will not be affected by the resistance caused by impurities when it falls due to current overload, thus improving the arc extinguishing speed.

[0035] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fusible link for use in a drop-out fuse, comprising a fusible tube (1), a rotating component (2) and a connecting frame (3), wherein an upper conductive sleeve (4) and a lower conductive sleeve (5) are fixedly provided at both ends of the fusible tube (1), a rotating plate (51) is fixedly provided side by side on the outer circumferential surface of the lower conductive sleeve (5), and a support frame (31) is provided on one side of the connecting frame (3); The connecting frame (3) has a protrusion (32) fixed on its side away from the support frame (31) between the two rotating plates (51), and the sides of the two rotating plates (51) that are close to each other are rotatably connected to the protrusion (32) through a rotating member (2); characterized in that, The protrusion (32) is provided with an elastic element (6), which enables the lower conductive sleeve (5) to have a rotational force to rotate in the direction of the support frame (31).

2. The fusible link for a drop-out fuse according to claim 1, characterized in that, The protruding block (32) is fixedly provided with positioning bosses (321) on the side near the two rotating plates (51). The elastic element (6) is a torsion spring (61) sleeved on the outer circumferential surface of the positioning boss (321). The two ends of the torsion spring (61) are respectively fixedly provided with a first fixing rod (611) fixedly connected to the rotating plate (51) and a second fixing rod (612) fixedly connected to the positioning boss (321).

3. A fusible linker for a drop-out fuse according to claim 1, characterized in that, The fusion tube (1) has an arc-shaped notch (11) on its outer circumferential surface near the lower conductive sleeve (5). The lower conductive sleeve (5) has a locking through hole (52) that can communicate with and overlap with the inner wall of the arc-shaped notch (11). The fusion tube (1) has a fixing pin (12) on its outside that can be simultaneously embedded in the locking through hole (52) and the arc-shaped notch (11).

4. A fusible linker for a drop-out fuse according to claim 1, characterized in that, The rotating component (2) is a guide rod (21). The end of the protrusion (32) near the rotating plate (51) is provided with a fixed through hole (322) for the guide rod (21) to pass through. Both rotating plates (51) are provided with positioning through holes (55) for the guide rod (21) to pass through. A fixing ring (211) and a fixing cap (212) are respectively fixed on the outer circumferential surfaces at both ends of the guide rod (21). The sides of the fixing ring (211) and the fixing cap (212) that are close to each other are respectively pressed against the sides of the two rotating plates (51) that are far apart from each other.

5. A fusible linker for a drop-out fuse according to claim 1, characterized in that, A guide ring (7) is slidably provided on the outer circumferential surface of the melting tube (1). A cleaning cotton (71) is fixed on the inner wall of the guide ring (7). An insulating pull ring (72) is fixed on the guide ring (7) for the worker to drive the guide ring (7) to move back and forth along the axial direction of the melting tube (1).

6. A fusible linker for a drop-out fuse according to claim 5, characterized in that, The lower conductive sleeve (5) is fixed with a positioning block (53) facing the upper conductive sleeve (4) on its outer peripheral surface. The guide ring (7) has a clearance notch (73) on its side near the lower conductive sleeve (5) for the positioning block (53) to be inserted and fixed.

7. A fusible linker for a drop-out fuse according to claim 6, characterized in that, Two fixing plates (74) facing the lower conductive sleeve (5) are fixedly disposed on the outer peripheral surface of the guide ring (7). The fixing plates (74) can be elastically deformed and reset. Fixing blocks (741) are fixed on the sides of the two fixing plates (74) that are close to each other. A locking groove (54) is provided on the outer peripheral surface of the lower conductive sleeve (5). The fixing block (741) can be embedded in the locking groove (54) when the positioning block (53) is inserted into the clearance notch (73).

8. A fusible linker for a drop-out fuse according to claim 7, characterized in that, The fixing block (741) has a guide slope (7411) on its side edge away from the guide ring (7).

Images