A high-break-capacity high-voltage current-limiting fuse

Abstract

The application discloses a high-breakage-capacity high-voltage current-limiting fuse, and relates to the technical field of fuses.The high-breakage-capacity high-voltage current-limiting fuse comprises a high-strength insulator, an upper connecting terminal is fixed to the top of the high-strength insulator through a support, a lower support is fixed to the bottom of the high-strength insulator, a lower connecting terminal is fixed to the lower support, a waterproof cover is further fixed to the top of the high-strength insulator through the support, and a duckbill is fixed to the upper connecting terminal through a bolt.The setting of a tripping device makes the rotating disc, the slide column, the U-shaped groove plate and the waterproof cover cooperate to drive the U-shaped push rod to push the fuse tube and separate the fuse tube from the duckbill, so that the remote tripping operation of the fuse tube is completed, the staff does not need to stand directly below the fuse, and the arc spraying area and the falling area of the fuse tube are completely avoided;further, the motor driving is more stable than manual pulling and closing, and the problem of fuse tube falling damage caused by manual shaking or excessive force is avoided.

Description

Technical Field

[0001] This invention relates to the field of fuse technology, specifically to a high breaking capacity high voltage current-limiting fuse. Background Technology

[0002] High-breaking-capacity high-voltage current-limiting fuses are safety devices used to protect high-voltage power systems. They can quickly interrupt current in the event of short-circuit or overload faults, effectively preventing equipment damage and fire risks. These fuses have excellent current-limiting characteristics, capable of withstanding short-circuit currents up to several thousand amperes. By rapidly melting and breaking the fuse, they reduce fault current, contributing to improved stability and reliability of the power system. They are suitable for critical applications such as substations and industrial equipment.

[0003] Chinese Patent Publication No. CN215496612U discloses a drop-out fuse, belonging to the field of power equipment technology. The drop-out fuse includes an insulator and a fuse tube. Two guide members are provided at the upper end of the insulator, extending in a V-shape towards the fuse tube. The fuse tube is clamped between the two guide members, and each guide member has an arc-shaped groove adapted to the fuse tube. The drop-out fuse provided in this embodiment increases the clamping area between the guide members and the fuse tube by providing arc-shaped grooves on the guide members that mate with the fuse tube. This improves the stability of the fuse tube, prevents it from swaying in the wind, ensures reliable contact between the upper stationary contact and the upper moving contact, avoids power instability caused by loose connections, improves the stability of line operation, and reduces the frequency of faults.

[0004] However, current fuses have the following problems: when a fuse malfunctions and needs to be disconnected for maintenance, sparks and smoke are likely to occur during the disconnection process. Even with the help of an insulated operating rod, personnel are still at risk. Since they need to stand under the fuse, it is especially dangerous to disconnect a faulty fuse. Therefore, we have proposed a high breaking capacity high voltage current limiting fuse. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-breaking-capacity high-voltage current-limiting fuse, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high breaking capacity high-voltage current-limiting fuse, comprising a high-strength insulator, an upper terminal fixed to the top of the high-strength insulator by a bracket, a lower bracket fixed to the bottom of the high-strength insulator, a lower terminal fixed to the lower bracket, a waterproof cover fixed to the top of the high-strength insulator by a bracket, a duckbill tongue fixed to the upper terminal by bolts, and a spring provided between the duckbill tongue and the top of the inner wall of the waterproof cover; a Y-shaped bracket fixed to the bottom of the waterproof cover. A fuse tube is hung at the lower support, and the top metal cap of the fuse tube is electrically in contact with the bottom of the duckbill. A circuit breaker device is provided at the waterproof cover. The circuit breaker device includes a shell fixed to the top of the waterproof cover and a U-shaped groove plate slidably installed on the top of the waterproof cover. A turntable is rotatably installed on the top of the inner wall of the shell, and the turntable is driven by a motor. A sliding column is fixed at the bottom edge of the turntable. A sliding groove is opened at the top of the U-shaped groove plate, and the sliding column is slidably installed inside the sliding groove of the U-shaped groove plate. A U-shaped push rod is fixed at the bottom of the U-shaped groove plate.

[0007] According to the above technical solution, the horizontal support of the U-shaped push rod is located below the duckbill, and the upper outer wall of the fuse tube is located on the movement trajectory of the U-shaped push rod.

[0008] According to the above technical solution, elastic telescopic rods are fixed on both sides of the waterproof cover, and an L-shaped inclined plate is fixed between the bottom of the elastic telescopic rods. An L-shaped horizontal plate is fixed on the outer wall of the telescopic end of the elastic telescopic rod. An abutment rod is evenly and equidistantly installed through the top of the L-shaped horizontal plate. A spring is provided between the abutment rod and the top of the L-shaped horizontal plate. Vertical grooves for vertical sliding of the L-shaped horizontal plate are opened on both sides of the waterproof cover.

[0009] According to the above technical solution, the inclined surface of the L-shaped inclined plate is located on the movement trajectory of the U-shaped push rod, and the bottom of the abutting rod is in contact with the top of the duck tongue.

[0010] According to the above technical solution, a U-shaped vertical sliding plate is vertically slidably installed inside the U-shaped push rod, and a spring is provided between the U-shaped vertical sliding plate and the bottom of the inner wall of the U-shaped push rod. A U-shaped horizontal sliding plate is horizontally slidably installed inside the U-shaped vertical sliding plate, and a grinding plate is rotatably installed inside the U-shaped horizontal sliding plate. A torsion spring is provided between the grinding plate and the U-shaped horizontal sliding plate.

[0011] According to the above technical solution, a corrugated groove plate is fixed on the outer wall of the waterproof cover, and a corrugated groove is opened on the top of the corrugated groove plate. An L-shaped column is fixed on the side of the U-shaped horizontal sliding plate, and the L-shaped column passes through the outer wall of the U-shaped vertical sliding plate. A through groove for the L-shaped column is opened on the outer wall of the U-shaped push rod, and the end of the L-shaped column away from the U-shaped vertical sliding plate is slidably installed inside the corrugated groove of the corrugated groove plate.

[0012] According to the above technical solution, the top of the grinding plate protrudes from the top of the U-shaped transverse plate, and the bottom of the duck tongue is located on the top movement trajectory of the grinding plate.

[0013] According to the above technical solution, a buffer device is provided below the waterproof cover. The buffer device includes an I-shaped frame fixed to the bottom of the waterproof cover. Arc-shaped hollow tubes are fixed on both sides of the bottom of the I-shaped frame. Arc-shaped plug rods are slidably installed inside the arc-shaped hollow tubes. Push columns are fixed at the ends of the two arc-shaped plug rods away from the arc-shaped hollow tubes. A horizontal tube is fixed between the two arc-shaped hollow tubes. Z-shaped tubes are fixed on both sides of the top of the horizontal tubes. Hollow boxes are fixed at the top of the two Z-shaped tubes. Hollow boxes are fixed to the outer wall of the waterproof cover. A plug plate is slidably installed inside the hollow box. An L-shaped connecting rod is fixed between the outer wall of the plug plate and the outer wall of the U-shaped groove plate.

[0014] According to the above technical solution, the interior of the arc-shaped hollow tube is connected to the interior of the hollow box through a horizontal tube and a Z-shaped tube.

[0015] According to the above technical solution, the pusher abuts against the outer wall of the fuse tube.

[0016] This invention provides a high breaking capacity high-voltage current-limiting fuse. It has the following advantages: (1) The present invention, through the setting of the circuit breaker device, enables the turntable, sliding column, U-shaped groove plate and waterproof cover to work together to drive the U-shaped push rod to push the fuse tube and the duck tongue to separate, thereby completing the remote circuit breaker operation of the fuse tube. The operator does not need to stand directly under the fuse, completely avoiding the arcing area and falling area of ​​the fuse tube. Moreover, the motor drive is more stable than manual pulling and closing, avoiding the problem of the fuse tube falling and being damaged due to manual shaking or excessive force. At the same time, the contact rod applies downward pressure to the duck tongue at the top, so that the bottom of the duck tongue can make close contact with the top metal cap of the fuse tube, thereby ensuring a stable electrical contact between the duck tongue and the top metal cap of the fuse tube. Good contact can ensure that all current flows through the fuse tube, avoiding the premature generation of arc at the contact point, ensuring that the current limiting fuse can reliably disconnect within the designed full range. At the same time, it avoids the problem that the traditional duck tongue relies only on its own elasticity, which is prone to pressure decay due to metal fatigue, oxidation or vibration, forming a false contact point, causing local overheating or even melting.

[0017] (2) In this invention, the grinding plate grinds the bottom of the duck tongue, thereby forcibly scraping away the oxide scale and carbides on the bottom of the duck tongue, so that the contact resistance is always kept at a low level when the circuit is closed next time, thus preventing the burning accident caused by poor contact from the root. This avoids the problem of the traditional duck tongue and the top metal cap of the fuse tube being exposed to the outdoors for a long time, which is prone to the formation of oxide film or arc erosion uneven surface, resulting in increased resistance and heat generation. At the same time, the U-shaped transverse plate drives the grinding plate to dynamically grind the bottom of the duck tongue, thereby achieving full contact surface grinding of the duck tongue, avoiding the problem of excessive wear at a single point or grinding dead corner.

[0018] (3) By setting up a buffer device, the pusher will slowly lower the fuse tube against the circuit breaker during each trip, thus avoiding the problem that the fuse tube may fall accidentally and endanger the equipment or personnel below during the rapid fall due to gravity at the moment of tripping. When the staff needs to re-hang the fuse tube and close the circuit, the air inside the arc-shaped cavity tube will push the arc-shaped plug rod out of the arc-shaped cavity tube. The arc-shaped plug rod pushes the fuse tube to close the circuit through the pusher, thus avoiding the problem that the fuse tube is extremely fast at the end of the traditional manual closing circuit, which will violently hit the duckbill and easily cause the metal cap at the top of the fuse tube to deform or the duckbill spring to undergo irreversible plastic deformation. Over time, this will inevitably lead to poor contact and overheating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the entire invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A; Figure 4 This is a schematic diagram of the circuit breaker device of the present invention; Figure 5 This is a partial structural diagram of the circuit breaker device of the present invention. Figure 1 ; Figure 6 This is a partial structural diagram of the circuit breaker device of the present invention. Figure 2 ; Figure 7 This is a schematic diagram of the buffer device of the present invention; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B.

[0020] In the diagram: 1. High-strength insulator; 2. Upper terminal block; 3. Waterproof cover; 4. Circuit breaker; 41. Housing; 42. Turntable; 421. Sliding column; 43. U-shaped channel plate; 44. U-shaped push rod; 45. Elastic telescopic rod; 46. L-shaped inclined plate; 47. L-shaped horizontal plate; 48. Contact rod; 49. L-shaped column; 410. Corrugated channel plate; 411. U-shaped vertical moving plate; 412. U-shaped horizontal moving plate; 413. Grinding plate; 5. Buffer device; 51. I-shaped frame; 52. Arc-shaped hollow tube; 53. Arc-shaped plug rod; 54. Push column; 55. Horizontal tube; 56. Z-shaped tube; 57. L-shaped connecting rod; 58. Plug plate; 59. Hollow box; 6. Duck tongue; 7. Y-shaped frame; 8. Fuse tube; 9. Lower support; 10. Lower terminal block. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Please see Figure 1 - Figure 8One embodiment of the present invention is as follows: a high breaking capacity high voltage current-limiting fuse includes a high-strength insulator 1. An upper terminal 2 is fixed to the top of the high-strength insulator 1 via a bracket. A lower bracket 9 is fixed to the bottom of the high-strength insulator 1, and a lower terminal 10 is fixed to the lower bracket 9. A waterproof cover 3 is also fixed to the top of the high-strength insulator 1 via a bracket. A duckbill 6 is bolted to the upper terminal 2, and a spring is provided between the duckbill 6 and the top of the inner wall of the waterproof cover 3. A Y-shaped frame 7 is fixed to the bottom of the waterproof cover 3. A fuse tube 8 is hung at the lower bracket 9, and the top metal cap of the fuse tube 8 is in electrical contact with the bottom of the duckbill 6. A tripping device 4 is provided at the waterproof cover 3. The tripping device 4 includes a housing 41 fixed to the top of the waterproof cover 3 and a U-shaped groove plate 43 slidably mounted on the top of the waterproof cover 3. A turntable 42 is rotatably mounted on the top of the inner wall of the housing 41, and the turntable 42 is driven by a motor. The motor corresponding to the turntable 42 has a battery energy storage module and a remote control module. All modules are based on existing technology. The motor is a fully sealed, grounded micro geared motor with its metal casing serving as a shielding layer. The battery energy storage module and remote control module are integrated into a sealed metal shielding box, which effectively resists the coupling interference of external electromagnetic fields. A sliding column 421 is fixed at the bottom edge of the turntable 42. A sliding groove is opened at the top of the U-shaped channel plate 43, and the sliding column 421 is slidably installed inside the sliding groove of the U-shaped channel plate 43. A U-shaped push rod 44 is fixed at the bottom of the U-shaped channel plate 43. The horizontal support of the U-shaped push rod 44 is located below the duck tongue 6, and the upper outer wall of the fuse tube 8 is located on the movement trajectory of the U-shaped push rod 44. Through the above structure, the U-shaped push rod 44 pushes the fuse tube 8 to separate from the duck tongue 6, thereby completing the remote tripping operation of the fuse tube 8. The operator does not need to stand directly under the fuse, completely avoiding the arcing zone and falling zone of the fuse tube 8. Moreover, the motor drive is more stable than manual pulling and closing, avoiding the problem of the fuse tube 8 falling and being damaged due to human shaking or excessive force.

[0023] The waterproof cover 3 is fixed with elastic telescopic rods 45 on both sides. An L-shaped inclined plate 46 is fixed between the bottom of the elastic telescopic rods 45. An L-shaped horizontal plate 47 is fixed on the outer wall of the telescopic end of the elastic telescopic rods 45. An abutment rod 48 is evenly and equidistantly installed through the top of the L-shaped horizontal plate 47. A spring is provided between the abutment rod 48 and the top of the L-shaped horizontal plate 47. Vertical grooves for vertical sliding of the L-shaped horizontal plate 47 are opened on both sides of the waterproof cover 3. The inclined surface of the L-shaped inclined plate 46 is located on the movement trajectory of the U-shaped push rod 44. The bottom of the abutment rod 48 contacts the top of the duck tongue 6. Through the above structure, the abutment rod 48 applies downward pressure to the duck tongue 6 at the top of the duck tongue 6. The bottom of the duck tongue 6 can contact the top metal cap of the fuse tube 8 tightly, thereby ensuring a stable electrical contact between the duck tongue 6 and the top metal cap of the fuse tube 8.

[0024] A U-shaped vertical sliding plate 411 is vertically slidably installed inside the U-shaped push rod 44, and a spring is provided between the U-shaped vertical sliding plate 411 and the bottom of the inner wall of the U-shaped push rod 44. A U-shaped horizontal sliding plate 412 is horizontally slidably installed inside the U-shaped vertical sliding plate 411, and a grinding plate 413 is rotatably installed inside the U-shaped horizontal sliding plate 412. A torsion spring is provided between the grinding plate 413 and the U-shaped horizontal sliding plate 412. Through the above structure, the grinding plate 413 will grind the bottom of the duck tongue 6. The grinding plate 413 will forcibly scrape and remove the oxide scale and carbides on the surface of the duck tongue 6, so that the contact resistance will always be kept at a low level when the circuit is closed next, thus preventing the burning accident caused by poor contact from the root.

[0025] A wavy groove plate 410 is fixed on the outer wall of the waterproof cover 3. The top of the wavy groove plate 410 has a wavy groove. An L-shaped column rod 49 is fixed on the side of the U-shaped transverse plate 412. The L-shaped column rod 49 passes through the outer wall of the U-shaped vertical plate 411. The outer wall of the U-shaped push rod 44 has a through groove for the L-shaped column rod 49. The end of the L-shaped column rod 49 away from the U-shaped vertical plate 411 is slidably installed inside the wavy groove of the wavy groove plate 410. The top of the grinding plate 413 protrudes from the top of the U-shaped transverse plate 412. The bottom of the duck tongue 6 is located on the top movement trajectory of the grinding plate 413. Through the above structure, the U-shaped transverse plate 412 drives the grinding plate 413 to dynamically grind the bottom of the duck tongue 6, thereby achieving full contact surface grinding of the duck tongue 6 and avoiding the problem of excessive wear at a single point or grinding dead corners.

[0026] When in use, when a circuit breaker operation is required, the operator can start the motor corresponding to the turntable 42 through the remote control module. The motor will drive the turntable 42 to rotate the sliding column 421. The sliding column 421 slides along the inside of the U-shaped groove plate 43 and pushes the U-shaped groove plate 43 to slide to one side along the top of the waterproof cover 3. The U-shaped groove plate 43 drives the U-shaped push rod 44 to move accordingly. At this time, the U-shaped push rod 44 will push the fuse tube 8 to move accordingly, thereby separating the fuse tube 8 from the duck tongue 6, thus completing the remote circuit breaker operation of the fuse tube 8. The operator does not need to stand directly under the fuse, completely avoiding the arcing area and falling area of ​​the fuse tube 8. Moreover, the motor drive is more stable than manual pulling and closing, avoiding the problem of the fuse tube 8 falling and being damaged due to human shaking or excessive force.

[0027] Each time the fuse tube 8 is in the closed state, the U-shaped channel plate 43 and the U-shaped push rod 44 are in their initial positions, that is, the bottom of the U-shaped push rod 44 presses against the top of the L-shaped inclined plate 46. The L-shaped inclined plate 46, along with the telescopic end of the elastic telescopic rod 45, is in a stretched state. This causes the telescopic end of the elastic telescopic rod 45 to move downward through the L-shaped inclined plate 46, driving the L-shaped horizontal plate 47 and the abutment rod 48. Under the action of the spring force corresponding to the abutment rod 48, the abutment rod 48 applies downward pressure to the duckbill 6 at the top of the duckbill 6. This allows the bottom of the duckbill 6 to make tight contact with the top metal cap of the fuse tube 8, thus ensuring stable electrical contact between the duckbill 6 and the top metal cap of the fuse tube 8. Good contact ensures that all current flows through the fuse tube 8, preventing the arc from being generated prematurely at the contact point. This ensures that the current-limiting fuse can reliably disconnect within the designed full range. At the same time, it avoids the problem that traditional duckbill 6, relying solely on its own elasticity, is prone to pressure attenuation due to metal fatigue, oxidation, or vibration, forming a false contact and causing local overheating or even melting.

[0028] During each circuit breaker trip, the sliding column 421 pushes the U-shaped channel plate 43 to slide to one side along the top of the waterproof cover 3. As the U-shaped channel plate 43 moves, the U-shaped push rod 44 moves along with it. The U-shaped push rod 44, through the U-shaped vertical moving plate 411 and the U-shaped horizontal moving plate 412, moves the grinding plate 413. Under the spring force of the corresponding U-shaped vertical moving plate 411, the U-shaped vertical moving plate 411, through the U-shaped horizontal moving plate 412, causes the grinding plate 413 to abut against the bottom of the duck tongue 6. Simultaneously, under the corresponding torsion spring force, the grinding plate 413 adapts to a certain degree of torsion on the bottom surface of the duck tongue 6, thereby ensuring the grinding plate... The grinding plate 413 can make close contact with the bottom of the duck tongue 6. As the U-shaped push rod 44 moves, the U-shaped push rod 44 will drive the grinding plate 413 to move as well. The grinding plate 413 will grind the bottom of the duck tongue 6, thereby forcibly scraping away the oxide scale and carbides on the surface of the duck tongue 6. This ensures that the contact resistance remains at a low level when the circuit is closed again, preventing the burning accident caused by poor contact from the root. This avoids the problem of the traditional duck tongue 6 and the top metal cap of the fuse tube 8 being exposed to the outdoors for a long time, which is prone to the formation of oxide film or uneven surface caused by arc erosion, resulting in increased resistance and heat generation.

[0029] Meanwhile, during the movement of the U-shaped push rod 44, the U-shaped push rod 44 drives the L-shaped column rod 49 to move along with it through the U-shaped vertical moving plate 411, the U-shaped horizontal moving plate 412 and the grinding plate 413. Under the constraint of the wavy groove of the wavy groove plate 410, the wavy groove of the wavy groove plate 410 will push the L-shaped column rod 49 to drive the U-shaped horizontal moving plate 412 to move back and forth along the inside of the U-shaped vertical moving plate 411, so that the U-shaped horizontal moving plate 412 drives the grinding plate 413 to dynamically grind the bottom of the duck tongue 6, thereby achieving full contact surface grinding of the duck tongue 6 and avoiding the problem of excessive wear at a single point or grinding dead corners.

[0030] It should be noted that when the U-shaped vertical moving plate 411 is displaced vertically by the corresponding spring force, the U-shaped vertical moving plate 411 will drive the L-shaped column 49 to move along with it. The L-shaped column 49 will move vertically within the wavy groove of the wavy groove plate 410, and the L-shaped column 49 will not leave the wavy groove of the wavy groove plate 410.

[0031] Please see Figure 1 - Figure 8 Based on the above embodiments, in another embodiment of the present invention, a buffer device 5 is provided below the waterproof cover 3. The buffer device 5 includes an I-shaped frame 51 fixed to the bottom of the waterproof cover 3. Arc-shaped hollow tubes 52 are fixed on both sides of the bottom of the I-shaped frame 51. Arc-shaped plug rods 53 are slidably installed inside the arc-shaped hollow tubes 52. Push rods 54 are fixed at the ends of the two arc-shaped plug rods 53 away from the arc-shaped hollow tubes 52. A horizontal tube 55 is fixed between the two arc-shaped hollow tubes 52. Z-shaped tubes 56 are fixed on both sides of the top of the horizontal tube 55. Hollow tubes 56 are fixed at the top of the two Z-shaped tubes 56. The cavity box 59 is fixed to the outer wall of the waterproof cover 3. A stopper plate 58 is slidably installed inside the cavity box 59. An L-shaped connecting rod 57 is fixed between the outer wall of the stopper plate 58 and the outer wall of the U-shaped groove plate 43. The interior of the arc-shaped cavity tube 52 is connected to the interior of the cavity box 59 through a horizontal tube 55 and a Z-shaped tube 56. The pusher 54 abuts against the outer wall of the fuse tube 8. With the above structure, the pusher 54 is slowly lowered against the fuse tube 8, thereby avoiding the problem of the fuse tube 8 accidentally falling and endangering the equipment or personnel below during the rapid fall due to gravity at the moment of circuit breaker tripping.

[0032] During operation, each time a circuit breaker is tripped, the sliding column 421 pushes the U-shaped channel plate 43 to slide to one side along the top of the waterproof cover 3. The U-shaped channel plate 43, via the L-shaped connecting rod 57, moves the stopper plate 58. The stopper plate 58, through the Z-shaped tube 56 and the horizontal tube 55, draws air from the arc-shaped cavity tube 52 into the cavity box 59. At this time, the arc-shaped stopper rod 53 slowly retracts into the arc-shaped cavity tube 52, and the arc-shaped stopper rod 53 moves the push column 54 slowly. During this process, the push column 54 slowly lowers against the fuse tube 8, thus preventing the fuse tube 8 from accidentally falling and endangering equipment or personnel below during the rapid fall due to gravity at the moment of tripping. When the operator needs to re-attach the fuse tube 8 and re-close the circuit, the operator again activates the corresponding turntable 42 via the remote control module. The motor drives the turntable 42 to rotate the slide column 421 in the opposite direction. The slide column 421 pushes the U-shaped groove plate 43 to move back along the top of the waterproof cover 3. The U-shaped groove plate 43 drives the plug plate 58 to move back through the L-shaped connecting rod 57. The plug plate 58 delivers air from the arc-shaped cavity tube 52 to the cavity box 59 through the Z-shaped tube 56 and the horizontal tube 55. At this time, the air inside the arc-shaped cavity tube 52 pushes the arc-shaped plug rod 53 to extend out of the arc-shaped cavity tube 52. The arc-shaped plug rod 53 pushes the fuse tube 8 to perform the closing operation through the push column 54, thus avoiding the problem of the fuse tube 8 moving at a very high speed at the end in the traditional manual closing operation. This will violently impact the duckbill 6, which is very likely to cause deformation of the metal cap at the top of the fuse tube 8 or irreversible plastic deformation of the spring of the duckbill 6. Over time, this will inevitably lead to poor contact and overheating problems.

[0033] It should be noted that outdoor weather-resistant rubber sealing rings are used at both the arc-shaped plug rod 53 and the plug plate 58.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high breaking capacity high voltage current limiting fuse, comprising a high-strength insulator (1), wherein an upper terminal (2) is fixed to the top of the high-strength insulator (1) by a bracket, a lower bracket (9) is fixed to the bottom of the high-strength insulator (1), a lower terminal (10) is fixed to the lower bracket (9), a waterproof cover (3) is also fixed to the top of the high-strength insulator (1) by a bracket, a duckbill (6) is fixed to the upper terminal (2) by bolts, and a spring is provided between the duckbill (6) and the top of the inner wall of the waterproof cover (3), a Y-shaped frame (7) is fixed to the bottom of the waterproof cover (3), and a fuse tube (8) is hung at the lower bracket (9), wherein the metal cap at the top of the fuse tube (8) is in electrical contact with the bottom of the duckbill (6), characterized in that: A circuit breaker device (4) is provided at the waterproof cover (3). The circuit breaker device (4) includes a housing (41) fixed to the top of the waterproof cover (3) and a U-shaped groove plate (43) slidably installed on the top of the waterproof cover (3). A turntable (42) is rotatably installed on the top of the inner wall of the housing (41), and the turntable (42) is driven by a motor. A sliding column (421) is fixed at the bottom edge of the turntable (42). A sliding groove is opened on the top of the U-shaped groove plate (43). The sliding column (421) is slidably installed inside the sliding groove of the U-shaped groove plate (43). A U-shaped push rod (44) is fixed at the bottom of the U-shaped groove plate (43).

2. The high breaking capacity high voltage current-limiting fuse according to claim 1, characterized in that: The horizontal support of the U-shaped push rod (44) is located below the duck tongue (6), and the upper outer wall of the fuse tube (8) is located on the movement trajectory of the U-shaped push rod (44).

3. A high breaking capacity high voltage current-limiting fuse according to claim 1, characterized in that: The waterproof cover (3) is fixed with elastic telescopic rods (45) on both sides. An L-shaped inclined plate (46) is fixed between the bottom of the elastic telescopic rods (45). An L-shaped horizontal plate (47) is fixed on the outer wall of the telescopic end of the elastic telescopic rods (45). An abutment rod (48) is evenly and equidistantly installed on the top of the L-shaped horizontal plate (47). A spring is provided between the abutment rod (48) and the top of the L-shaped horizontal plate (47). Vertical grooves for the L-shaped horizontal plate (47) to slide vertically are provided on both sides of the waterproof cover (3).

4. A high breaking capacity high voltage current-limiting fuse according to claim 3, characterized in that: The inclined surface of the L-shaped ramp (46) is located on the movement trajectory of the U-shaped push rod (44), and the bottom of the abutting rod (48) is in contact with the top of the duck tongue (6).

5. A high breaking capacity high voltage current-limiting fuse according to claim 1, characterized in that: A U-shaped vertical sliding plate (411) is vertically slidably installed inside the U-shaped push rod (44), and a spring is provided between the U-shaped vertical sliding plate (411) and the bottom of the inner wall of the U-shaped push rod (44). A U-shaped horizontal sliding plate (412) is horizontally slidably installed inside the U-shaped vertical sliding plate (411), and a grinding plate (413) is rotatably installed inside the U-shaped horizontal sliding plate (412). A torsion spring is provided between the grinding plate (413) and the U-shaped horizontal sliding plate (412).

6. A high breaking capacity high voltage current-limiting fuse according to claim 5, characterized in that: A corrugated groove plate (410) is fixed on the outer wall of the waterproof cover (3). A corrugated groove is provided on the top of the corrugated groove plate (410). An L-shaped column rod (49) is fixed on the side of the U-shaped transverse plate (412). The L-shaped column rod (49) passes through the outer wall of the U-shaped vertical plate (411) laterally. A through groove for the L-shaped column rod (49) is provided on the outer wall of the U-shaped push rod (44). The end of the L-shaped column rod (49) away from the U-shaped vertical plate (411) is slidably installed inside the corrugated groove plate (410).

7. A high breaking capacity high voltage current-limiting fuse according to claim 5, characterized in that: The top of the grinding plate (413) protrudes from the top of the U-shaped transverse plate (412), and the bottom of the duck tongue (6) is located on the top movement trajectory of the grinding plate (413).

8. A high breaking capacity high voltage current-limiting fuse according to claim 1, characterized in that: A buffer device (5) is provided below the waterproof cover (3). The buffer device (5) includes an I-shaped frame (51) fixed to the bottom of the waterproof cover (3). An arc-shaped cavity tube (52) is fixed on both sides of the bottom of the I-shaped frame (51). An arc-shaped plug rod (53) is slidably installed inside the arc-shaped cavity tube (52). A push column (54) is fixed at one end of the two arc-shaped plug rods (53) away from the arc-shaped cavity tube (52). A horizontal tube (55) is fixed between the two arc-shaped cavity tubes (52). A Z-shaped tube (56) is fixed on both sides of the top of the horizontal tube (55). A cavity box (59) is fixed on the top of the two Z-shaped tubes (56). The cavity box (59) is fixed to the outer wall of the waterproof cover (3). A plug plate (58) is slidably installed inside the cavity box (59). An L-shaped connecting rod (57) is fixed between the outer wall of the plug plate (58) and the outer wall of the U-shaped groove plate (43).

9. A high breaking capacity high voltage current-limiting fuse according to claim 8, characterized in that: The interior of the arc-shaped cavity tube (52) is connected to the interior of the cavity box (59) through the horizontal tube (55) and the Z-shaped tube (56).

10. A high breaking capacity high voltage current-limiting fuse according to claim 8, characterized in that: The pusher (54) abuts against the outer wall of the fuse tube (8).

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