A fuse for high-voltage power distribution systems

Abstract

This invention provides a fuse for a high-voltage power distribution system and a method for replacing its conductive element, relating to the field of power equipment technology. The fuse has an upper insulating base, a lower insulating base, and an insulating protective cover mounted on its mounting base plate. Upper and lower conductive blocks are fixed to the inner wall of the insulating protective cover. A first elastic element is provided between the upper and lower insulating bases. The lower end of the conductive element is fixed to the lower insulating base, and the upper end of the conductive element has a mounting hole. A telescopic locking rod is provided on the upper insulating base, and the end of the telescopic locking rod is inserted into the mounting hole. The beneficial effects of this invention are: when the conductive element melts due to overload, the first elastic element can quickly push the upper and lower insulating bases apart, ensuring sufficient break distance. This ensures that the fuse can quickly disconnect the power and prevents arcing after the conductive element melts, reducing the hazards of overload. Furthermore, this fuse has the advantage of quick replacement of the conductive element, reducing power outage losses in the high-voltage power distribution system.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, specifically to a fuse for a high-voltage power distribution system and a method for replacing its conductive fuse element. Background Technology

[0002] As the core link in power transmission and distribution, the reliability of high-voltage power distribution systems directly affects industrial production, residential electricity consumption, and power grid safety. Fuses, as important overcurrent protection devices in high-voltage power distribution systems, interrupt fault currents by melting conductive elements, and are key devices for ensuring system safety.

[0003] Chinese Patent Application No. 200910216957.9 discloses a fuse comprising a hollow fuse tube, an upper fixing member mounted on the upper end of the fuse tube, a lower fixing member at the lower end of the fuse tube, a fuse fixing bracket hinged to the lower fixing member, a fuse wire inside the fuse tube, the upper end of the fuse wire electrically connected to the upper fixing member, and the lower end of the fuse wire electrically connected to the fuse fixing bracket, and a transparent secondary fuse tube fixedly attached to the lower end of the fuse tube, the lower end of which is fixedly connected to the lower fixing member. An observation block corresponding to the position of the secondary fuse tube is fitted onto the fuse wire. A protective tube for housing the fuse wire is provided inside the secondary fuse tube, and a locking part at the lower end of the fuse tube engages with the upper end of the protective tube. The locking part is a locking platform or groove. This fuse with this structure is simple in design, allows for quick determination of whether the fuse has blown, and enables maintenance personnel to quickly determine whether the fuse needs to be replaced without climbing.

[0004] Most existing fuses are drop-out fuses, typically installed at high altitudes or outdoors, requiring ample space. They are unsuitable for indoor environments or those with relatively limited structural space (such as power distribution systems in subway and high-speed rail stations). Furthermore, existing indoor fuses do not guarantee sufficient break-off distance after the conductive element melts, and the conductive element remains energized after melting. This can generate an electric arc under high voltage conditions, and the high temperature and discharge of the arc can cause further damage to the high-voltage power distribution system. Moreover, existing fuses are often directly fixed to the conductor with bolts, resulting in poor shock resistance. After the conductive element melts, the external components of the fuse must be disassembled, the melted conductive element removed from the energized conductor, and a new conductive element replaced. This process requires live-line work, which is complex, time-consuming, and prolongs power outages and increases the risk of fuse replacement. Therefore, there is an urgent need for a high-voltage power distribution system fuse that is reliable in connection, quick in power outage, and easy and safe in replacing the conductive fusible element. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the present invention aims to provide a fuse for high-voltage power distribution systems and a method for replacing its conductive element. When the conductive element of this fuse is overloaded, the heat generated by its heating melts the conductive element at its fuse-breaking point. The first elastic element of the fuse can quickly push open the upper and lower insulating seats, ensuring rapid power disconnection and preventing arcing after the conductive element melts, thus reducing the hazards of overload in the high-voltage power distribution system. When replacing the conductive element, this fuse does not require disassembling any components except for the broken portion of the original conductive element, greatly simplifying the replacement process, improving fuse replacement safety, shortening replacement time and restoration time, and reducing power outage losses in the high-voltage power distribution system. This fuse ensures reliable electrical connection of the conductive element and avoids the problems of increased contact resistance or poor contact caused by vibration or thermal expansion and contraction in traditional rigid connections. The slide drive assembly keeps the operating components away from the energized conductive block, improving the safety of the conductive element and further increasing the efficiency of conductive element replacement.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a fuse for a high-voltage power distribution system, comprising a housing, a conductive fusible element, and a slide drive assembly;

[0007] A mounting base plate is fixedly installed inside the outer shell. The mounting base plate has a sliding groove. An insulating protective cover plate is fixedly installed on the front of the mounting base plate. An upper conductive block and a lower conductive block are fixedly installed on the inner wall of the insulating protective cover plate. Both the upper conductive block and the lower conductive block are used to connect to the high-voltage line.

[0008] The outer casing is provided with an upper insulating seat and a lower insulating seat. Each of the upper and lower insulating seats is provided with a sliding block. Both sliding blocks are slidably disposed in the sliding groove, thereby allowing the upper and lower insulating seats to slide relative to each other on the mounting base plate. A first elastic element is provided between the upper and lower insulating seats.

[0009] The lower insulating base is provided with a clamping block, and the lower end of the conductive molten body is clamped on the clamping block; the upper end of the conductive molten body is also fixedly provided with a mounting hole, and the mounting hole is also provided with a fusing notch, which forms a fusing part on the conductive molten body; the upper end of the conductive molten body is provided with a guide wedge surface.

[0010] An upper mounting box is fixed on the upper insulating base. The upper mounting box contains a telescopic lever and a second elastic element. The second elastic element pushes the end of the telescopic lever to extend outside the upper mounting box and insert it into the mounting hole of the conductive melt. The upper and lower ends of the conductive melt are respectively attached to the upper conductive block and the lower conductive block.

[0011] The slide drive assembly is used to drive the upper insulating seat and the lower insulating seat to move closer to each other.

[0012] Furthermore, the upper mounting box is provided with a telescopic sleeve, and the telescopic lever is slidably disposed within the telescopic sleeve;

[0013] A limiting ring is fixedly provided on the telescopic lever, and the second elastic element is sleeved on the telescopic lever. The two ends of the second elastic element respectively abut against the bottom of the upper mounting box and the limiting ring.

[0014] Furthermore, the telescopic lever has a sliding limit rod in the middle, and a pressing push plate is provided on the telescopic lever. The pressing push plate has a push plate hole, and the sliding limit rod passes through the push plate hole to allow the pressing push plate to slide on the sliding limit rod.

[0015] The telescopic lever is also fitted with a third elastic element, the two ends of which abut against the upper mounting box and the pressing push plate, respectively. The pressing push plate presses the upper end of the conductive melt onto the upper conductive block.

[0016] Furthermore, the clamping block is provided with a clamping threaded hole, and a clamping screw is provided in the clamping threaded hole. The lower end of the conductive melt is provided with a locking hole, and the clamping screw locks the lower end of the conductive melt onto the clamping block.

[0017] Furthermore, the threaded hole is an internal hexagon screw, and the locking hole is a countersunk hole.

[0018] Furthermore, the lower insulating base is provided with a lower mounting box, the lower mounting box is provided with a telescopic hole, the end of the clamping block is provided with a limiting seat, the limiting seat is slidably disposed in the lower mounting box, the clamping block extends through the telescopic hole to the outside of the lower mounting box, and a plurality of V-shaped spring pieces are fixed inside the lower mounting box.

[0019] Furthermore, each of the two sliding blocks is provided with a supporting slider and a sliding drive rod on both sides. The sliding drive rod connected to the upper insulating seat is the upper drive rod, and the sliding drive rod connected to the lower insulating seat is the upper drive rod. The drive rod connected to the upper drive rod is the lower drive rod. A rotating pulley is provided on the upper drive rod.

[0020] The slide drive assembly includes a rotating sleeve, a drive shaft, and a drive turntable;

[0021] The rotating sleeve is fixed on the mounting base plate, the drive shaft is rotatably set inside the rotating sleeve, the drive turntable is fixed to the end of the drive shaft, a drive rope is wound on the drive turntable, one end of the drive rope is fixed on the drive turntable, and the other end of the drive rope passes around the rotating pulley and is fixedly connected to the lower drive rod.

[0022] Furthermore, a limiting cap is provided at the end of the drive shaft, and a drive rod is fixedly provided on the limiting cap.

[0023] Furthermore, a limiting block is provided in the middle of the sliding groove, which divides the sliding groove into an upper sliding groove and a lower sliding groove. The sliding block on the upper insulating seat is slidably disposed in the upper sliding groove, and the sliding block on the lower insulating seat is slidably disposed in the lower sliding groove.

[0024] The present invention also provides a method for replacing the conductive element of a fuse, the method being used in the aforementioned high-voltage power distribution system fuse, the method comprising the following steps;

[0025] S1: The conductive melt overheats due to overload, causing its fused section to break; the first elastic element simultaneously pushes the upper and lower insulating seats to move upward and downward along the sliding groove to the upper and lower ends of the sliding groove, respectively, so that the broken conductive melt can be quickly separated;

[0026] S2: The third elastic element pushes the pressing plate to move outward along the sliding limit rod, causing the pressing plate to push the upper fracture part of the conductive melt outward, so that the upper fracture part of the moving conductive melt is disengaged from the telescopic clamp.

[0027] S3: Remove the lower fracture of the conductive melt on the clamping block and fix the lower end of the new conductive melt on the clamping block;

[0028] S4: The upper and lower insulating seats are driven to move upward and downward respectively by the sliding seat drive assembly, so that the upper and lower insulating seats are close to each other. During the process of the upper and lower insulating seats approaching each other, the upper end guide wedge surface of the new conductive melt first presses the telescopic rod to retract, and then the mounting hole of the conductive melt moves to be aligned with the telescopic rod. The telescopic rod springs back and inserts into the mounting hole. The pressing push plate presses the upper end of the conductive melt onto the upper conductive block under the action of the third elastic element.

[0029] The beneficial effects of the fuse for high-voltage power distribution systems of the present invention are as follows:

[0030] (1) The fuse housing has an upper insulating seat and a lower insulating seat slidably mounted on the mounting base plate. An insulating protective cover is provided on the outside of the upper and lower insulating seats. Upper and lower conductive blocks are fixed on the inner wall of the insulating protective cover. A first elastic element is provided between the upper and lower insulating seats. The lower end of the conductive fusible element is fixed on the lower insulating seat. The upper end of the conductive fusible element is provided with a mounting hole. A telescopic clamp is provided on the upper insulating seat. The end of the telescopic clamp is inserted into the mounting hole. This allows the conductive fusible element to be mounted on the upper and lower insulating seats. The upper and lower insulating seats press the conductive fusible element onto the upper and lower conductive blocks respectively. This allows the conductive fusible element to conduct electricity between the upper and lower conductive blocks. When the conductive fusible element is overloaded, the heat generated by its heating can melt the conductive fusible element at its fuse point. At this time, the conductive fusible element breaks into upper and lower fracture parts. The first elastic element can quickly push the upper and lower insulating seats apart to ensure that there is a sufficient break gap between the upper and lower fracture parts. This can ensure that the fuse can quickly cut off the power and prevent the generation of an electric arc after the conductive fusible element melts, thereby reducing the harm of overload in the high-voltage power distribution system.

[0031] (2) After the conductive fusible element melts, the first elastic element can quickly push the upper and lower broken parts apart and slide out of the insulating protective cover plate along with the upper and lower insulating seats. The upper and lower broken parts of the conductive fusible element will separate from the upper and lower conductive blocks. In addition, a pressing push plate is provided on the telescopic rod on the upper insulating seat. A third elastic element is provided between the pressing push plate and the upper mounting box. The third elastic element pushes the upper broken part on the telescopic rod away from the telescopic rod quickly through the pressing push plate, ensuring that the high temperature of the upper broken part falls off quickly and automatically, preventing the high temperature of the upper broken part from damaging the upper insulating seat components, and avoiding the need for the high temperature of the upper broken part to be replaced during the process of replacing the conductive fusible element. This fuse eliminates the need for manual removal. When replacing the conductive element, the lower fractured part of the clamping block is first removed. Then, the lower end of the new conductive element is installed on the clamping block. The upper and lower insulating seats are moved closer together using the sliding block drive assembly to reset. During this reset process, the outer surface of the new conductive element first contacts the lower conductive block. Then, the guide wedge at the upper end of the conductive element drives the telescopic lever to retract. The upper end of the new conductive element continues to move upwards until its mounting hole aligns with the telescopic lever. The telescopic lever then pops out and inserts into the mounting hole of the new conductive element, completing the replacement. This fuse eliminates the need to disassemble any components except the lower fractured part of the original conductive element when replacing the conductive element. This significantly simplifies the replacement process, improves fuse replacement safety, shortens replacement time and restoration time, and reduces power outage losses in high-voltage power distribution systems.

[0032] (3) The telescopic lever of the upper insulating seat of the fuse is equipped with a third elastic element and a pressing push plate. After the conductive fuse is installed, the third elastic element can press the upper end of the conductive fuse onto the upper conductive block through the pressing push plate. The lower insulating seat is equipped with a lower mounting box, which is equipped with a telescopic hole. The end of the clamping block is equipped with a limiting seat, which is slidably set inside the lower mounting box. The clamping block extends through the telescopic hole to the outside of the lower mounting box. Multiple V-shaped springs are fixed inside the lower mounting box. After the conductive fuse is installed, the V-shaped springs can slightly squeeze the clamping block, so that the lower end of the conductive fuse is pressed onto the lower conductive block. After the conductive fuse is installed, its upper and lower ends are elastically mounted on the upper and lower insulating seats respectively. The upper and lower insulating seats use the third elastic element and V-shaped springs to elastically press the conductive fuse onto the upper and lower conductive blocks. This ensures the reliability of the conductive fuse's electrical connection and avoids the problem of increased contact resistance or poor contact caused by vibration or thermal expansion and contraction in the rigid connection of the traditional conductive fuse.

[0033] (4) The mounting base of the fuse is provided with a sliding drive assembly, which includes a rotating sleeve, a drive shaft and a drive turntable. The upper insulating seat and the lower insulating seat are respectively connected to the upper drive rod and the lower drive rod. The end of the upper drive rod is provided with a rotating pulley. The rotating sleeve is fixed on the mounting base. The drive shaft is rotatably set inside the rotating sleeve. The drive turntable is fixed to the end of the drive shaft. A drive rope is wound on the drive turntable. One end of the drive rope is fixed on the drive turntable. The other end of the drive rope passes around the rotating pulley and is fixedly connected to the lower drive rod. Rotating the drive shaft can shorten the length of the part of the drive rope that is not wound on the drive turntable. The upper insulating seat and the lower insulating seat are conveniently driven to move closer to each other by the tension of the drive rope, so as to realize the installation of the conductive fuse and the re-energization of the fuse. The sliding drive assembly can keep the operating parts away from the charged conductive block, improve the safety of the conductive fuse, and further improve the efficiency of the replacement of the conductive fuse of the fuse. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the front overall structure of a fuse for a high-voltage power distribution system according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the front and back structures of a fuse for a high-voltage power distribution system according to an embodiment of the present invention.

[0036] Figure 3 This is an exploded structural diagram of a fuse used in a high-voltage power distribution system according to an embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of a first partial structure of a fuse used in a high-voltage power distribution system according to an embodiment of the present invention.

[0038] Figure 5 yes Figure 4Enlarged view of point A in the middle.

[0039] Figure 6 This is a schematic diagram of the second partial structure of a fuse used in a high-voltage power distribution system according to an embodiment of the present invention.

[0040] Figure 7 This is a schematic diagram of the installation structure of the conductive fusible element of a fuse used in a high-voltage power distribution system according to an embodiment of the present invention.

[0041] Figure 8 This is an embodiment of the present invention. Figure 7 Enlarged view of point B in the middle.

[0042] Figure 9 This is an embodiment of the present invention. Figure 7 A magnified view of point C in the middle.

[0043] Figure 10 This is a flowchart of a method for replacing the conductive fuse element of a fuse according to the present invention.

[0044] In the above diagram: 100-Outer shell, 101-Mounting base plate, 102-Upper sliding groove, 103-Lower sliding groove, 200-Insulating protective cover plate, 201-Insulating mounting plate, 202-Upper conductive block, 203-Lower conductive block, 300-Upper insulating seat, 310-Upper mounting box, 311-Telescopic sleeve, 312-Telescopic locking rod, 313-Limiting ring, 314-Second elastic element, 315-Sliding limiting rod, 316-Pressure push plate, 317-Third elastic element, 320-Upper support slider, 321-Upper sliding locking block, 322-Upper drive rod, 323-Rotating pulley, 400-Lower insulating seat, 410-Lower mounting box, 411-Clamping block, 412-Limiting seat, 413- V-shaped spring, 414-clamping threaded hole, 415-clamping screw, 420-lower support slider, 421-lower sliding block, 422-lower drive rod, 500-conductive molten metal, 501-fusible part, 502-mounting hole, 503-locking hole, 600-first elastic element, 700-rotating sleeve, 701-drive shaft, 702-drive turntable, 703-limit cap, 704-drive rod, 800-drive rope. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0046] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0047] Please refer to Figures 1 to 10 The present invention provides a fuse for a high-voltage power distribution system, comprising a housing 100, a conductive fusible element 500, and a slide drive assembly; wherein the housing 100 is a rectangular box, and a closed door and a back panel are respectively provided on the front and back (the closed door and the back panel are not shown).

[0048] A rectangular mounting base plate 101 is fixedly installed inside the outer casing 100. The mounting base plate 101 has a sliding groove. An insulating protective cover plate 200 is fixedly installed on the front of the mounting base plate 101. The insulating protective cover plate 200 includes an insulating mounting plate 201 and two mounting side plates. The two mounting side plates fix the insulating mounting plate 201 to the mounting base plate 101. An upper conductive block 202 and a lower conductive block 203 are fixedly installed on the inner wall of the insulating mounting plate 201. The upper conductive block 202 and the lower conductive block 203 are both used to connect to high-voltage lines. The high-voltage lines can pass through the mounting side plates and connect to the upper conductive block 202 and the lower conductive block 203. The connection structure between the upper conductive block 202 and the lower conductive block 203 and the high-voltage lines is existing technology, and its structure will not be described in detail here.

[0049] The outer casing 100 contains an upper insulating seat 300 and a lower insulating seat 400. Both the upper insulating seat 300 and the lower insulating seat 400 are equipped with sliding blocks, which are slidably disposed within the sliding groove. This allows the upper insulating seat 300 and the lower insulating seat 400 to slide relative to each other on the mounting base 101. Specifically, the upper insulating seat 300 has an upper support slider 320. A limiting block is also provided in the middle of the sliding groove, dividing the sliding groove into a collinear upper sliding groove 102 and a lower sliding groove 103. The sliding block on the upper insulating seat 300 is an upper sliding block 321, which is fixedly disposed on the upper support slider 320 and slidably disposed within the upper sliding groove 102. The sliding block on the lower insulating seat 400 is a lower sliding block 421, which is fixedly disposed on the lower support slider 420 and slidably disposed within the lower sliding groove 103. A first elastic element 600 is provided between the upper insulating seat 300 and the lower insulating seat 400.

[0050] The lower insulating base 400 is provided with a clamping block 411, and the lower end of the conductive molten metal 500 is clamped on the clamping block 411. The upper end of the conductive molten metal 500 is also fixedly provided with a mounting hole 502, and the mounting hole 502 is also provided with a fusing notch. The fusing notch forms a fusing portion 501 on the conductive molten metal 500. The cross-sectional area of ​​the fusing portion 501 is relatively smaller than that of other parts of the conductive molten metal 500. When the conductive molten metal 500 experiences overload heating, its fusing portion 501 will melt first. A guide wedge surface is provided on the upper end of the conductive molten metal 500 near the inner side.

[0051] An upper mounting box 310 is fixedly provided on the upper insulating base 300. The upper mounting box 310 is provided with a telescopic locking rod 312 and a second elastic element 314. The second elastic element 314 pushes the end of the telescopic locking rod 312 through the upper mounting box 310 to extend outside the upper mounting box 310 and insert it into the mounting hole 502 of the conductive melt 500. The upper and lower ends of the conductive melt 500 are respectively attached to the upper conductive block 202 and the lower conductive block 203. In this way, the conductive melt 500 electrically connects the upper conductive block 202 and the lower conductive block 203, thereby connecting the high-voltage line of the high-voltage power distribution system.

[0052] The slide drive assembly is used to drive the upper insulating seat 300 and the lower insulating seat 400 to move closer to each other, so that the conductive melt 500 is connected and clamped on the upper insulating seat 300 and the lower insulating seat 400, thereby conducting the upper conductive block 202 and the lower conductive block 203.

[0053] When the conductive fusible element 500 is overloaded, the heat generated by its heating can melt the conductive fusible element 500 at its fuse section 501. At this time, the conductive fusible element 500 breaks into upper and lower fracture sections. The first elastic element 600 can quickly push the upper and lower insulating seats apart. The upper insulating seat 300 and the lower insulating seat 400 slide out of the insulating protective cover plate 200 respectively. The upper and lower insulating seats move to the upper part of the upper sliding groove 102 and the lower part of the lower sliding groove 103 respectively. The upper and lower fracture sections of the conductive fusible element 500 will separate from the upper and lower conductive blocks. This can ensure that there is a sufficient break gap between the upper and lower fracture sections. This can ensure that the fuse can quickly cut off the power and prevent the conductive fusible element 500 from generating an electric arc after melting, thereby reducing the harm of overload in the high-voltage power distribution system.

[0054] In a preferred embodiment, the upper mounting box 310 is provided with a telescopic sleeve 311, and the telescopic locking rod 312 is slidably disposed within the telescopic sleeve 311. A limiting ring 313 is fixedly provided on the telescopic locking rod 312, and a second elastic member 314 is sleeved on the telescopic locking rod 312. The two ends of the second elastic member 314 respectively abut against the bottom of the upper mounting box 310 and the limiting ring 313. Thus, when the end of the telescopic locking rod 312 is squeezed by the guiding wedge surface of the conductive melt 500, the telescopic locking rod 312 can overcome the elastic force of the second elastic member 314 and retract.

[0055] The telescopic locking rod 312 has a sliding limiting rod 315 in the middle. The sliding limiting rod 315 is part of the telescopic locking rod 312, and its diameter is smaller than the diameter of the rest of the telescopic locking rod 312. The telescopic locking rod 312 is provided with a pressing push plate 316. The pressing push plate 316 is provided with a push plate hole. The sliding limiting rod 315 passes through the push plate hole, allowing the pressing push plate 316 to slide on the sliding limiting rod 315. The diameter of the push plate hole is smaller than the diameter of the rest of the telescopic locking rod 312, which can limit the sliding of the pressing push plate 316 on the telescopic locking rod 312. Within the range of motion, a third elastic element 317 is also fitted onto the telescopic lever 312. The two ends of the third elastic element 317 abut against the upper mounting box 310 and the pressing push plate 316, respectively. The upper end of the complete conductive molten metal 500 on the pressing push plate 316 is pressed against the upper conductive block 202. After the conductive molten metal 500 breaks, the pressing push plate 316 can quickly push the upper broken portion of the conductive molten metal 500 on the telescopic lever 312 away from the telescopic lever 312 via the third elastic element 317, ensuring that the high-temperature upper broken portion quickly and automatically detaches. It can be understood that the first, second, and third elastic elements can all be helical springs.

[0056] The clamping block 411 is provided with a clamping threaded hole 414, and a clamping screw 415 is provided in the clamping threaded hole 414. The lower end of the conductive melt 500 is provided with a locking hole 503. The clamping screw 415 locks the lower end of the conductive melt 500 onto the clamping block 411. The clamping threaded hole 414 is an internal hexagon screw, and the locking hole 503 is a countersunk hole. This ensures that after the clamping screw 415 locks the lower end of the conductive melt 500, the head of the clamping screw 415 will not protrude from the locking hole 503.

[0057] After the conductive fusible element 500 melts, the third elastic element 317 on the telescopic lever 312 quickly pushes the upper fractured part on the telescopic lever 312 away from the telescopic lever 312 through the pressing push plate 316. This ensures that the high-temperature upper fractured part falls off quickly and automatically, preventing the high temperature of the upper fractured part from damaging the upper insulating seat 300 component, and avoiding the problem of manually removing the high-temperature upper fractured part during the replacement of the conductive fusible element 500.

[0058] When replacing the new conductive fuse element 500 of this fuse, first remove the broken part of the clamping block 411, then install the lower end of the new conductive fuse element 500 on the clamping block 411. Use the slide drive assembly to drive the upper insulating seat 300 and the lower insulating seat 400 to move closer to each other to reset. During the reset process of the upper insulating seat 300 and the lower insulating seat 400, the outer surface of the new conductive fuse element 500 first contacts the lower conductive block 203. Then, the guide wedge surface at the upper end of the conductive fuse element 500 will first drive the telescopic locking rod 312 to retract. The upper end of the new conductive fuse element 500 continues to move upward until the mounting hole 502 at the upper end of the conductive fuse element 500 is aligned with the telescopic locking rod 312. Then, the telescopic locking rod 312 can pop out and insert into the mounting hole 502 of the new conductive fuse element 500. At this time, the replacement of the conductive fuse element 500 is completed. When replacing the conductive fuse element 500, this fuse does not require disassembling any other components except for the fractured part of the original conductive fuse element 500. This greatly simplifies the replacement process of the conductive fuse element 500, improves the safety of fuse replacement, shortens the replacement time of the conductive fuse element 500 and the power restoration time of the fuse, and reduces power outage losses in the high-voltage power distribution system.

[0059] In a preferred embodiment, the lower insulating base 400 is provided with a lower mounting box 410, the lower mounting box 410 is provided with a telescopic hole, and the end of the clamping block 411 is provided with a limiting seat 412. The two are integrated structures. The limiting seat 412 is slidably disposed inside the lower mounting box 410, and the clamping block 411 extends through the telescopic hole to the outside of the lower mounting box 410. A plurality of V-shaped spring pieces 413 are fixed inside the lower mounting box 410. The V-shaped spring pieces 413 can push the clamping block 411 outward, so that the clamping block 411 can elastically press the lower end of its upper conductive melt 500 onto the lower conductive block 203.

[0060] The third elastic element 317 on the telescopic lever 312 of the upper insulating base 300 of the fuse can press the upper end of the conductive fuse 500 onto the upper conductive block 202 by the pressing push plate 316 after the conductive fuse 500 is installed. The lower insulating base 400 is provided with a lower mounting box 410. After the conductive fuse 500 is installed, the V-shaped spring piece 413 in the lower mounting box 410 can slightly squeeze the clamping block 411, so that the lower end of the conductive fuse 500 is pressed onto the lower conductive block 203. After the conductive fuse 500 is installed, its upper and lower ends are elastically mounted on the upper and lower insulating bases respectively. The third elastic element 317 and the V-shaped spring piece 413 on the upper and lower insulating bases elastically press the conductive fuse 500 onto the upper and lower conductive blocks, thus ensuring the reliability of the electrical connection of the conductive fuse 500 and avoiding the problem of increased contact resistance or poor contact caused by vibration or thermal expansion and contraction in the rigid connection of the traditional conductive fuse 500.

[0061] refer to Figure 9In this embodiment, expansion joints are provided in the middle of both the upper and lower conductive blocks. This allows both the upper and lower conductive blocks to have a certain degree of elasticity, enabling them to undergo elastic deformation under pressure. This ensures a tight fit between the conductive melt 500 and the upper and lower conductive blocks, further improving the reliability of the electrical connection between the conductive melt 500 and the upper and lower conductive blocks. Simultaneously, the elasticity of the upper and lower conductive blocks allows them to be slightly compressed by the conductive melt 500, ensuring smooth vertical sliding of the conductive melt 500 and preventing interference with the upper and lower conductive blocks during its upward movement. An outer wedge surface (not shown in the figure) can also be provided on the outer surface of the upper end of the conductive melt 500. The outer wedge surface ensures that the conductive melt 500 is not blocked by the lower edges of the upper and lower conductive blocks during its upward movement.

[0062] refer to Figures 1-3 The slide drive assembly includes a rotating sleeve 700, a drive shaft 701, and a drive turntable 702. A rotating pulley 323 is provided on the upper drive rod 322. The rotating sleeve 700 is fixed to the mounting base plate 101. The drive shaft 701 is rotatably mounted inside the rotating sleeve 700 via bearings. The drive turntable 702 is fixed to the end of the drive shaft 701. A drive rope 800 is wound around the drive turntable 702. One end of the drive rope 800 is fixed to the drive turntable 702, and the other end passes over the rotating pulley 323 and is fixedly connected to the lower drive rod 422. A limiting cap 703 is also provided at the end of the drive shaft 701 to prevent the drive shaft 701 from falling out of the rotating sleeve 700. A drive rod 704 is also fixed on the limiting cap 703 to facilitate the rotation of the drive shaft 701 by the operator.

[0063] After the conductive fuse 500 melts, the upper and lower insulating seats are pushed to the top of the upper slide groove 102 and the bottom of the lower slide groove 103 by the first elastic element 600, respectively. When the new conductive fuse 500 is locked onto the clamping block 411 on the lower insulating seat 400 by the clamping screw 415, the operator can rotate the drive shaft 701 through the drive rod 704 to drive the drive turntable 702 to rotate. This shortens the length of the part of the drive rope 800 that is not wrapped around the drive turntable 702. The tension of the drive rope 800 can easily drive the upper insulating seat 300 and the lower insulating seat 400 to move closer to each other, realizing the installation of the conductive fuse 500 and the restoration of the fuse. This slide drive assembly can keep the operating parts away from the live conductive block, improve the safety of the conductive fuse 500, and further improve the efficiency of replacing the conductive fuse 500 of the fuse.

[0064] refer to Figure 10 The present invention discloses a method for replacing the conductive fusible element of a fuse, used in the aforementioned high-voltage power distribution system fuse, the method comprising the following steps;

[0065] S1: Overheating of the conductive melt 500 causes its fusible section 501 to break; the first elastic element 600 simultaneously pushes the upper insulating seat 300 and the lower insulating seat 400 to move up and down along the sliding groove to the upper and lower ends of the sliding groove, so that the broken conductive melt 500 can be quickly separated.

[0066] S2: The third elastic element pushes the pressing plate 316 to move outward along the sliding limit rod 315, so that the pressing plate 316 pushes the upper fracture part of the conductive melt 500 outward, so that the upper fracture part of the moving conductive melt 500 is disengaged from the telescopic clamp rod 312.

[0067] S3: Remove the lower fracture part of the conductive melt 500 on the clamping block 411 and fix the lower end of the new conductive melt 500 on the clamping block 411.

[0068] S4: The upper insulating seat 300 and the lower insulating seat 400 are driven to move downward and upward respectively by the slide drive assembly, so that the upper insulating seat 300 and the lower insulating seat 400 are close to each other; during the process of the upper insulating seat 300 and the lower insulating seat 400 approaching each other, the upper end guide wedge surface of the new conductive melt 500 first presses the telescopic clamp 312 to retract, and then the mounting hole 502 of the conductive melt 500 moves to align with the telescopic clamp 312. The telescopic clamp 312 springs back and inserts into the mounting hole 502. The pressing push plate 316 presses the upper end of the conductive melt 500 onto the upper conductive block 202 under the action of the third elastic element 317.

[0069] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0070] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fuse for use in a high-voltage power distribution system, characterized in that, Includes an outer casing (100), a conductive molten metal (500), and a slide drive assembly; An installation base plate (101) is fixedly provided inside the outer shell (100). A sliding groove is provided on the installation base plate (101). An insulating protective cover plate (200) is fixedly provided on the front of the installation base plate (101). An upper conductive block (202) and a lower conductive block (203) are fixedly provided on the inner wall of the insulating protective cover plate (200). The outer casing (100) is provided with an upper insulating seat (300) and a lower insulating seat (400). Both the upper insulating seat (300) and the lower insulating seat (400) are provided with sliding blocks, and both sliding blocks are slidably disposed in the sliding groove. A first elastic element (600) is provided between the upper insulating seat (300) and the lower insulating seat (400). The lower insulating base (400) is provided with a clamping block (411), and the lower end of the conductive melt (500) is clamped on the clamping block (411); the upper end of the conductive melt (500) is also fixedly provided with a mounting hole (502), and the mounting hole (502) is also provided with a fusing notch, which forms a fusing part (501) on the conductive melt (500), and the upper end of the conductive melt (500) is provided with a guide wedge surface; An upper mounting box (310) is fixedly provided on the upper insulating base (300). The upper mounting box (310) is provided with a telescopic lever (312) and a second elastic element (314). The second elastic element (314) pushes the end of the telescopic lever (312) to extend outside the upper mounting box (310) and insert it into the mounting hole (502) of the conductive melt (500). The upper and lower ends of the conductive melt (500) are respectively attached to the upper conductive block (202) and the lower conductive block (203). The slide drive assembly is used to drive the upper insulating seat (300) and the lower insulating seat (400) to move closer to each other.

2. A fuse for a high-voltage power distribution system according to claim 1, characterized in that, The upper mounting box (310) is provided with a telescopic sleeve (311), and the telescopic lever (312) is slidably disposed in the telescopic sleeve (311); A limiting ring (313) is fixedly provided on the telescopic lever (312), and the second elastic element (314) is sleeved on the telescopic lever (312). The two ends of the second elastic element (314) respectively abut against the bottom of the upper mounting box (310) and the limiting ring (313).

3. A fuse for a high-voltage power distribution system according to claim 2, characterized in that, The telescopic lever (312) has a sliding limit lever (315) in the middle, and a pressing push plate (316) is provided on the telescopic lever (312). The pressing push plate (316) is provided with a push plate hole, and the sliding limit lever (315) passes through the push plate hole so that the pressing push plate (316) is slidably disposed on the sliding limit lever (315). The telescopic lever (312) is also fitted with a third elastic element (317), the two ends of which abut against the upper mounting box (310) and the pressing push plate (316) respectively. The pressing push plate (316) presses the upper end of the conductive melt (500) onto the upper conductive block (202).

4. A fuse for a high-voltage power distribution system according to claim 3, characterized in that, The clamping block (411) is provided with a clamping threaded hole (414), and a clamping screw (415) is provided in the clamping threaded hole (414). The lower end of the conductive melt (500) is provided with a locking hole (503). The clamping screw (415) locks the lower end of the conductive melt (500) onto the clamping block (411).

5. A fuse for a high-voltage power distribution system as described in claim 4, characterized in that, The clamping threaded hole (414) is an internal hexagon screw, and the locking hole (503) is a countersunk hole.

6. A fuse for a high-voltage power distribution system according to claim 4, characterized in that, The lower insulating base (400) is provided with a lower mounting box (410), the lower mounting box (410) is provided with a telescopic hole, the end of the clamping block (411) is provided with a limiting seat (412), the limiting seat (412) is slidably disposed in the lower mounting box (410), the clamping block (411) extends through the telescopic hole to the outside of the lower mounting box (410), and a plurality of V-shaped spring pieces (413) are fixed inside the lower mounting box (410).

7. A fuse for a high-voltage power distribution system according to claim 3, characterized in that, The two sliding blocks are respectively provided with a supporting slider and a sliding drive rod on both sides. The sliding drive rod connected to the upper insulating seat (300) is the upper drive rod (322), and the sliding drive rod connected to the lower insulating seat (400) is the lower drive rod (422). The upper drive rod (322) is provided with a rotating pulley (323). The slide drive assembly includes a rotating sleeve (700), a drive shaft (701), and a drive turntable (702). The rotating sleeve (700) is fixed on the mounting base plate (101). The drive shaft (701) is rotatably disposed inside the rotating sleeve (700). The drive turntable (702) is fixed to the end of the drive shaft (701). A drive rope (800) is wound around the drive turntable (702). One end of the drive rope (800) is fixed on the drive turntable (702), and the other end of the drive rope (800) passes around the rotating pulley (323) and is fixedly connected to the lower drive rod (422).

8. A fuse for a high-voltage power distribution system according to claim 7, characterized in that, The end of the drive shaft (701) is also provided with a limit cap (703), and a drive rod (704) is also fixed on the limit cap (703).

9. A fuse for a high-voltage power distribution system according to claim 8, characterized in that, The sliding groove is also provided with a limiting block in the middle. The limiting block divides the sliding groove into an upper sliding groove (102) and a lower sliding groove (103). The sliding block on the upper insulating seat (300) is slidably disposed in the upper sliding groove (102), and the sliding block on the lower insulating seat (400) is slidably disposed in the lower sliding groove (103).

10. A method for replacing the conductive element of a fuse, characterized in that, This method is used for any of the fuses in high-voltage power distribution systems according to claims 3-9, and the method includes the following steps; S1: The conductive melt (500) overheats due to overload, causing its fused section (501) to break; the first elastic element (600) simultaneously pushes the upper insulating seat (300) and the lower insulating seat (400) to move up and down along the sliding groove to the upper and lower ends of the sliding groove, respectively, so that the broken conductive melt (500) can be separated quickly. S2: The third elastic element (317) pushes the pressing push plate (316) to move outward along the sliding limit rod (315), so that the pressing push plate (316) pushes the upper fracture part of the conductive melt (500) outward, so that the upper fracture part of the conductive melt (500) is disengaged from the telescopic clamp (312); S3: Remove the lower fracture part of the conductive melt (500) on the clamping block (411) and fix the lower end of the new conductive melt (500) on the clamping block (411); S4: Drive the upper insulating seat (300) and the lower insulating seat (400) to move downward and upward respectively, so that the upper insulating seat (300) and the lower insulating seat (400) approach each other; during the process of the upper insulating seat (300) and the lower insulating seat (400) approaching each other, the upper end guide wedge surface of the new conductive melt (500) first presses the telescopic clamp (312) to retract, and then the mounting hole (502) of the conductive melt (500) moves to align with the telescopic clamp (312), the telescopic clamp (312) springs back and inserts into the mounting hole (502), and the pressing push plate (316) presses the upper end of the conductive melt (500) onto the upper conductive block (202) under the action of the third elastic element (317).

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