Intelligent fuse

Abstract

The invention provides an intelligent fuse, and relates to the technical field of power maintenance, the intelligent fuse is provided with a static contact matched with a connecting arm, and the top of an insulating seat is fixedly connected with an elastic arm; the fuse further comprises an insulating support and a fusion tube, the bottom of the insulating support is fixedly connected with a connecting arm and the bottom of the fusion tube, and the fuse further comprises a fuse piece, a winding assembly, a wire feeding assembly, a clamping assembly and an executing mechanism. Through the arrangement of the wire feeding assembly, the execution mechanism, the clamping assembly, the reset mechanism and the like, when a worker carries out wire replacement and reset operation on a drop-out fuse at a high position on the ground, the worker only needs to push a connecting ring upwards through an insulating rod to enable a fused residual fuse wire to fall off, and then a fusion tube is pushed again to be reset. A worker does not need to carry out tedious operation on the fuse tube and the fuse wire, and especially for a large-scale power system fault, the reset efficiency of the fuse has a remarkable advantage.

Description

Technical Field

[0001] The invention relates to the technical field of power maintenance, in particular to an intelligent fuse. Background Art

[0002] Drop-out fuses are generally installed on branch lines of 10kV distribution lines to reduce the scope of power outages. Because they have an obvious disconnection point and have the function of an isolating switch, they create a safe working environment.

[0003] Since drop-out fuses are usually installed at a high position, when the fuse needs to be replaced, the staff must use an insulating rod to remove the high-place fuse tube, replace the internal fuse, and then install it back on the insulating support. However, after a large-scale power failure, there are often a large number of fuse tubes that need to be replaced in the distribution system. If they are replaced one by one in the conventional way, not only is the operation difficult, but the work efficiency is also low.

[0004] A Chinese patent with application number CN202111319043.2 discloses a drop-out fuse, including an insulating support, a fuse tube, a reel and a fuse. A support arm is fixedly arranged at the bottom of the insulating support, and a clamping portion is fixedly arranged at the top of the insulating support. The fuse tube includes a tube body, a static contact and a moving contact. The static contact and the moving contact are relatively arranged at two ends of the tube body, the static contact is fixedly connected to one end of the tube body, the static contact is hinged to the support arm, the moving contact is movably provided with an elastic clamping portion, and an elastic contraction portion is fixedly arranged between the elastic clamping portion and the fuse tube. The reel is movably arranged on the side wall of the tube body, a first through hole is penetrated through the side wall of the tube body, and a second through hole is penetrated through the moving contact. One end of the fuse is wound on the reel of the reel, and the other end passes through two through holes and abuts against the elastic clamping portion. The elastic clamping portion is detachably connected to the fuse, and the support arm, the static contact, the fuse, the elastic clamping portion and the clamping portion are conductive. The fuse is stored in a reel. When the fuse blows, the operator needs to remove the fuse tube, pull out part of the fuse in the reel, and fix the fuse on the elastic clamping part, which saves the step of replacing the fuse. However, this method still requires the fuse tube to be removed. In the event of a large-scale power system failure, the overall efficiency is not greatly improved.

[0005] The Chinese patent with application number CN202111319037.7 discloses a drop-out fuse, including an insulating support, a fusion tube, a locking piece and a fuse, wherein a clamping part and a support arm are respectively arranged at the upper and lower ends of the insulating support; the fusion tube includes a tube body, a static contact and a moving contact, the static contact is hinged with the support arm, and the moving contact is movably provided with a fixed column, a clamping groove is provided on the side wall of the fixed column, an elastic contraction part is fixedly arranged between the fixed column and the tube body, the fixed column has a working position clamped with the clamping part and a non-working position separated from the clamping part, and the elastic contraction part always has a tendency to drive the fixed column to rotate toward the non-working position; the locking piece can lock the fixed column in the working position; a first pull ring is fixed on the fuse at equal intervals, a reel is arranged on the outer side of the tube body, one end of the fuse is wound on the reel of the reel, and the other end passes through the tube body, the moving contact and the clamping groove in sequence, and the first pull ring at the end of the fuse is pressed against the fixed column. The above structure achieves the effects of high efficiency in fuse replacement and low difficulty in operation. The ultimate effect of the fuse is that there is no need to remove the fuse tube body, only the fuse in the reel needs to be reconnected, but the connection process of the fuse still needs to be done manually. Since the fuse itself is in a high position, it is difficult for the staff to perform more detailed operations on the fuse remotely on the ground directly through the insulating rod.

[0006] Therefore, it is necessary to invent an intelligent fuse to solve the above problems. Summary of the invention

[0007] In view of the above problems, the present invention provides an intelligent fuse, which has the advantages of high wire replacement efficiency and strong universality.

[0008] The present invention comprises an insulating support and a melting tube, wherein a connecting arm is fixedly connected to the bottom of the insulating support, a static contact matching the connecting arm is arranged at the bottom of the melting tube, and an elastic arm is fixedly connected to the top of the insulating support, and further comprises: A fuse, which is located in the fuse tube and can perform a fusing action, and a conductive member that penetrates into the fuse tube is fixedly connected to the static contact, and the conductive member is in contact with the fuse; The winding assembly comprises a reel located at one side of the melting tube, wherein a reel is coaxially arranged inside the reel; The wire feeding assembly comprises a wire feeding block movable up and down in the fusion tube, the wire feeding block having a first sliding state and a second sliding state, in the first sliding state, the wire feeding block drives the fuse to move upward, in the second sliding state, the wire feeding block resets to an initial position, an actuator is arranged at the bottom of the fusion tube to drive the wire feeding block to the first sliding state, and a reset mechanism is arranged on the wire feeding assembly to make the wire feeding block enter the second sliding state; The card connection assembly comprises a card contact fixedly connected to the elastic arm, the card contact is provided with a connection groove, and the two sides of the connection groove are respectively slidably connected with card blocks. Both the card contact and the card block are conductive. When the top of the melting tube approaches the card contact and forms a limit, the two card blocks approach each other.

[0009] Preferably, the fuse element includes a fuse, one end of which is wound on a reel, and the other end is clamped on a wire feeding block, the fuse includes a plurality of staggered fuse parts and conductive parts, the melting point of the fuse part is lower than the melting point of the conductive part, and the melting points of each fuse part change in a step-like manner, and the melting point of the fuse part close to the reel is the highest.

[0010] Preferably, an annular cavity is opened in the wire feeding block, a clamping plate is slidably connected in the annular cavity, the clamping plate and the annular cavity are connected by a spring, a connecting rod is eccentrically arranged on the wire feeding block, the connecting rod is a hollow structure, the reset mechanism is located at the top of the connecting rod, a branch pipe located in the annular cavity is arranged on the connecting rod, a positioning cylinder is provided on the clamping plate and is sealingly and slidably connected to the branch pipe, a fixing rod is sealingly and slidably connected to the bottom of the connecting rod, the fixing rod is a cylindrical structure with openings at both ends, and an elastic reset part is arranged between the fixing rod and the wire feeding block.

[0011] Preferably, the actuator comprises an annular cylinder coaxially fixed to the bottom of the melting tube, a partition is coaxially fixed in the annular cylinder, the partition divides the annular cylinder into an inner cavity and an outer cavity, the inner cavity and the outer cavity are connected to each other, the fixed rod is fixedly connected to the top of the annular cylinder and is connected to the inner cavity, a piston member sliding up and down is arranged in the outer cavity, an L-shaped tube is fixedly connected to the bottom of the annular cylinder, the piston member is sealingly and slidably connected to the L-shaped tube, and a ball head rod is sealingly and slidably connected to one end of the L-shaped tube away from the annular cylinder; The connecting arm is provided with a mounting portion, the mounting portion includes a mounting plate, a movable groove is provided on the mounting plate, a connecting plate is fixedly connected to one side of the mounting plate, a movable channel is formed between the connecting plate and the mounting plate, and the ball head portion of the ball head rod is located in the movable channel; The top of the annular cylinder is provided with an air hole communicating with the outer cavity, the bottom of the annular cylinder is fixedly connected with an air inlet pipe, a conical flow channel is arranged in the air inlet pipe, and a sealing ball which moves up and down is arranged in the conical flow channel.

[0012] Preferably, the reset mechanism comprises a sealing plug located at the top of the connecting rod, the sealing plug is sealingly and slidably connected to the connecting rod, a connecting tube is fixedly connected to the bottom of the sealing plug through a plurality of connecting columns, an air outlet channel is formed between the sealing plug and the connecting tube, a plurality of L-shaped flow channels evenly distributed around the circumference are opened on the top of the connecting rod, a top rod is coaxially fixed inside the fixing rod, and a retaining ring is coaxially fixed to the top of the inner wall of the melting tube; A limiting groove is arranged in the connecting rod, and a limiting ring is coaxially fixed on the bottom of the connecting cylinder.

[0013] Preferably, the card-connecting assembly also includes a moving rod slidably connected to the card contact head, the end of the card-connecting block away from the connecting groove is arranged as an arc surface and has a card slot, two symmetrically distributed connecting strips are fixedly connected to the moving rod, a sliding rod is fixed to the end of the connecting strip away from the moving rod, and a card block matching the card slot is fixedly connected to the top of the sliding rod.

[0014] Preferably, two symmetrically distributed sliding cavities are provided in the card contact head, a sliding rod is coaxially slidable in the sliding cavity, one end of the sliding rod passes through the sliding cavity and is fixedly connected to the top of the card block, a positioning plate is coaxially fixed to the other end of the sliding rod, and a limiting cavity is respectively provided on the top of the two sliding cavities, a limiting plate is slidably connected to the limiting cavity through a spring, and a plurality of unidirectional limiting teeth distributed at equal intervals are fixedly connected to the bottom of the limiting plate, and the spacing of each unidirectional limiting tooth matches the thickness of the positioning plate; One end of the two limiting plates passing through the limiting cavity is fixedly connected with the same connecting ring.

[0015] Preferably, the fuse comprises a reducing assembly and a metal wire, the reducing assembly comprises a shell coaxially fixed below the wire feeding block, a rotating drum coaxially rotates in the shell, a positioning rod is fixedly connected in the fusion tube, a spiral track is provided on the positioning rod, a connecting wheel matching the threaded track is provided on the positioning rod, the connecting wheel is connected to the rotating drum through a synchronous belt transmission structure, a mounting block is fixedly connected to the outer wall of the shell, and the mounting block is rotatably connected to the connecting wheel; A plurality of arc blocks evenly distributed around the circumference are fixedly connected to the inner wall of the rotating drum, an arc groove is provided on the arc block, and the cross-section of the arc groove is a spherical structure. A plurality of roller units matching the arc blocks are arranged in the rotating drum, and the roller unit includes a connecting frame and a roller, a connecting piece matching the arc groove is fixedly connected to one side of the connecting frame, and slide grooves matching the rollers are respectively provided on the upper and lower sides of the shell.

[0016] Preferably, a plurality of pressure strips evenly distributed around the circumference are provided on the outer wall of the roller.

[0017] Preferably, the roller comprises an upper rotating rod in an upper part and a lower rotating rod in a lower part, and threaded strips are respectively arranged on the outer walls of the upper rotating rod and the lower rotating rod in a mirror-like manner.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 1. Through the settings of wire feeding assembly, actuator, clamping assembly and reset mechanism, when the staff performs wire replacement and reset operations on the high drop-type fuse on the ground, they only need to push the connecting ring upwards through the insulating rod to make the residual fuse fall off, and then push the fuse tube again to reset it. During the reset of the fuse tube, the new fuse will be reconnected to the clamping assembly. The whole process does not require the staff to perform tedious operations on the fuse tube and fuse, which greatly improves the efficiency of fuse replacement and reset. Especially for large-scale power system faults, the reset efficiency of the fuse has significant advantages.

[0019] 2. Through the settings of the shell, rotating drum, positioning rod and roller unit, after the conventional metal wire is installed in the fuse, the reducing assembly can extrude and reduce the diameter of the metal wire, so that the resistance of the reducing section is significantly increased, thereby realizing the control of the fusing position of the metal wire and improving the universality of the fuse.

[0020] 3. Through the arrangement of the upper rotating rod, the lower rotating rod and the spiral strip, the metal wire is subjected to lateral extrusion force, and is also subjected to upward and downward pulling force to cause the metal wire to be stretched and deformed, thereby further improving the diameter-changing effect of the metal wire and avoiding the problem of elastic reset of the metal wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0022] Figure 2 It is a plan side view of the present invention.

[0023] Figure 3 It is a plan cross-sectional view of the present invention.

[0024] Figure 4 It is a partial cross-sectional view of the card contact and the connecting member in the present invention.

[0025] Figure 5 It is a three-dimensional cross-sectional view of the wire feeding assembly in the present invention.

[0026] Figure 6 It is a three-dimensional cross-sectional view of the actuator in the present invention.

[0027] Figure 7 It is a schematic diagram of the coordination of the air intake pipe and the sealing ball in the present invention.

[0028] Figure 8 The present invention Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0029] Fig. 9 The present invention Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0030] Fig.10It is a three-dimensional half-section view of the card contact in the present invention from another angle.

[0031] Fig.11 It is a plan cross-sectional view of embodiment 2 of the present invention.

[0032] Fig.12 It is a three-dimensional cross-sectional view of the variable diameter component in the present invention.

[0033] Fig.13 It is a schematic diagram of the matching of the shell and the connecting piece in the present invention.

[0034] Fig.14 It is a three-dimensional schematic diagram of the arc block and the arc groove in the present invention.

[0035] Fig.15 It is a three-dimensional schematic diagram of the upper rotating rod and the lower rotating rod in Example 3 of the present invention.

[0036] Fig.16 It is a three-dimensional schematic diagram of the connecting piece in the present invention.

[0037] Explanation of the symbols in the schematic diagram: 1. Insulating support; 2. Melting tube; 3. Connecting arm; 4. Static contact; 5. Elastic arm; 6. Fuse; 7. Conductive member; 8. Reel; 9. Wire feeding block; 10. Card contact; 11. Connecting groove; 12. Card block; 13. Fuse part; 14. Conductive part; 15. Annular cavity; 16. Clamping plate; 17. Connecting rod; 18. Branch pipe; 19. Positioning cylinder; 20. Fixed rod; 21. Elastic reset member; 22. Annular cylinder; 23. Partition; 24. Inner cavity; 25. Outer cavity; 26. Piston; 27. L-shaped tube; 28. Ball head rod; 29. ​​Mounting plate; 30. Active groove; 31. Connecting plate; 32. Active channel; 33. Inlet pipe; 34. Sealed Sealing ball; 35. Sealing plug; 36. Connecting cylinder; 37. Air outlet channel; 38. L-shaped flow channel; 39. Push rod; 40. Retaining ring; 41. Moving rod; 42. Slot; 43. Connecting strip; 44. Sliding rod; 45. Sliding cavity; 46. Sliding rod; 47. Positioning plate; 48. Limiting cavity; 49. Limiting plate; 50. One-way limiting tooth; 51. Connecting ring; 52. Variable diameter assembly; 53. Metal wire; 54. Shell; 55. Rotating cylinder; 56. Positioning rod; 57. Connecting wheel; 58. Mounting block; 59. Arc block; 60. Arc groove; 61. Connecting frame; 62. Roller; 63. Connecting piece; 64. Upper rotating rod; 65. Lower rotating rod; 66. Threaded strip. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1 In the use of drop-out fuses, when replacing the fuse, the staff needs to use an insulating rod to remove the high-placed fuse tube 2, and then install it back on the insulating support 1 after completing the replacement of the internal fuse. Some drop-out fuses also use a fuse winding method. When the fuse is blown, the fuse tube 2 is removed, and the fuse is directly pulled out and re-fixed, or the fuse tube 2 is not removed, and the fuse is only operated using an insulating rod from below. However, the above two methods still have corresponding problems: First, although the step of replacing the fuse is saved, the fuse tube 2 still needs to be removed, so in large-scale power system failures, the overall efficiency improvement is not high; second, because the fuse itself is in a high position, it is difficult for the staff to directly perform a relatively detailed operation on the fuse remotely on the ground through the insulating rod. In response to the above problems, this embodiment proposes an intelligent fuse.

[0040] Depend on Figures 1 to 3 It is given, including an insulating support 1 and a melting tube 2, the bottom of the insulating support 1 is fixedly connected with a connecting arm 3, the bottom of the melting tube 2 is provided with a static contact 4 matching the connecting arm 3, the top of the insulating seat is fixedly connected with an elastic arm 5, and also includes a fuse 6, a winding assembly, a wire feeding assembly and a clamping assembly. The fuse 6 is located in the melting tube 2 and can perform a melting action. The static contact 4 is fixedly connected with a conductive part 7 that penetrates into the inside of the melting tube 2, and the conductive part 7 is in contact with the fuse 6. In this embodiment, the fuse 6 includes a fuse, and the fuse includes a plurality of staggered fuse parts 13 and conductive parts 14, the melting point of the fuse part 13 is less than the melting point of the conductive part 14, and the melting point of the fuse part 13 changes in a step-like manner.

[0041] refer to Figure 2 and Figure 3 As shown, the winding assembly includes a reel 8 located on one side of the fuse tube 2, a reel is coaxially arranged inside the reel 8, one end of the fuse is wound around the reel, the melting point of the fuse part 13 close to the reel side is the highest, and a torsion spring is arranged between the reel and the reel 8, so that the fuse is subjected to a certain pre-tightening force on the reel.

[0042] refer to Figure 3As shown, the wire feeding assembly includes a wire feeding block 9 that moves up and down in the fuse tube 2. The end of the fuse away from the reel is clamped with the wire feeding block 9. The wire feeding block 9 has a first sliding state and a second sliding state. In the first sliding state, the wire feeding block 9 drives the fuse to move upward, and the fuse in the reel 8 is unwound. In the second sliding state, the wire feeding block 9 resets to the initial position.

[0043] An actuator is provided at the bottom of the melting tube 2 to drive the wire feeding block 9 to enter the first sliding state, and a reset mechanism is provided on the wire feeding assembly to enable the wire feeding block 9 to enter the second sliding state.

[0044] refer to Figure 3 and Figure 4 As shown, the clamping assembly includes a clamping contact 10 fixedly connected to the elastic arm 5, a connecting groove 11 is provided on the clamping contact 10, and clamping blocks 12 are slidably connected to both sides of the connecting groove 11. When the top of the fuse tube 2 approaches the clamping contact 10 and forms a limit, the two clamping blocks 12 approach each other and fix the fuse. The contact surfaces of the two clamping blocks 12 and the fuse are fixed with multiple convex strips or convex blocks to strengthen the fixation of the clamping blocks 12 to the fuse.

[0045] refer to Figure 5 As shown, the wire feeding assembly is further supplemented by an annular cavity 15 provided in the wire feeding block 9, a clamping plate 16 being slidably connected in the annular cavity 15, the clamping plate 16 being connected to the annular cavity 15 by a spring, the clamping force of the clamping plate 16 on the fuse being less than the clamping force of the two clamping blocks 12 on the fuse, the fuse being coaxial with the wire feeding block 9 and its end passing through the annular cavity 15, at this time the clamping plate 16 fixes the fuse under the action of the spring, a plurality of clamping blocks are provided on the contact surface between the clamping plate 16 and the fuse to strengthen the fixation of the fuse, a connecting rod 17 is eccentrically provided on the wire feeding block 9, and the connecting rod 17 is a hollow structure, and the reset mechanism is located at the top of the connecting rod 17. The connecting rod 17 is provided with a branch pipe 18 located in the annular cavity 15, and the clamping plate 16 is provided with a positioning cylinder 19 which is sealingly and slidably connected to the branch pipe 18. When gas enters the inside of the connecting rod 17, the positioning cylinder 19 slides on the branch pipe 18 to further strengthen the fixation of the clamping plate 16 to the fuse. The bottom of the connecting rod 17 is sealingly and slidably connected with a fixing rod 20, and the fixing rod 20 is a tubular structure with openings at both ends. An elastic reset member 21 is provided between the fixing rod 20 and the wire feeding block 9, and the elastic reset member 21 is a spring.

[0046] refer to Figure 6As shown, the actuator includes an annular cylinder 22 coaxially fixed to the bottom of the melting tube 2, a partition 23 is coaxially fixed inside the annular cylinder 22, the partition 23 divides the annular cylinder 22 into an inner cavity 24 and an outer cavity 25, the inner cavity 24 and the outer cavity 25 are connected to each other, a fixed rod 20 is fixedly connected to the top of the annular cylinder 22 and is connected to the inner cavity 24, a piston member 26 sliding up and down is arranged in the outer cavity 25, the piston member 26 includes a piston ring sliding in the outer cavity 25, a piston rod is fixedly connected below the piston ring, a piston plate is fixedly connected to the end of the piston rod away from the piston ring, an L-shaped tube 27 is fixedly connected to the bottom of the annular cylinder 22, the piston plate slides in the L-shaped tube 27 in a sealing manner, and a ball head rod 28 is sealed and slidably connected to the end of the L-shaped tube 27 away from the annular cylinder 22.

[0047] refer to Figure 3 and Fig. 9 As shown, a mounting portion is provided on the connecting arm 3, and the mounting portion includes a mounting plate 29, on which a movable groove 30 is opened, a connecting plate 31 is fixedly connected to one side of the mounting plate 29, a movable channel 32 is formed between the connecting plate 31 and the mounting plate 29, and the ball head part of the ball head rod 28 is located in the movable channel 32.

[0048] refer to Figure 7 As shown, considering that when the fuse is blown, the fuse tube 2 will tilt, and at this time the piston member 26 moves upward in the outer cavity 25, in order to ensure the normal movement of the piston member 26, an air hole connected to the outer cavity 25 is opened at the top of the annular cylinder 22, and an air inlet pipe 33 is fixedly connected to the bottom of the annular cylinder 22, and a conical flow channel is arranged in the air inlet pipe 33, and a sealing ball 34 that moves up and down is arranged in the conical flow channel. When the piston member 26 moves upward in the outer cavity 25, the sealing ball 34 will move upward under the drive of pressure, and at this time, the external gas will enter the annular cylinder 22.

[0049] refer to Figure 8 As shown, the reset mechanism includes a sealing plug 35 located at the top of the connecting rod 17, the sealing plug 35 is sealingly and slidably connected to the connecting rod 17, a connecting tube 36 is fixedly connected to the bottom of the sealing plug 35 through a plurality of connecting columns, an air outlet channel 37 is formed between the sealing plug 35 and the connecting tube 36, a plurality of circumferentially evenly distributed L-shaped flow channels 38 are opened on the top of the connecting rod 17, a top rod 39 is coaxially fixed in the fixed rod 20, and a retaining ring 40 is coaxially fixed to the top of the inner wall of the melting tube 2. When the actuator drives the wire feeding block 9 and the fuse to move upward and reach the maximum extent, the sealing plug 35 is blocked by the retaining ring 40 and slides downward until the air outlet channel 37 matches the L-shaped flow channel 38, and the connecting rod 17 changes from a sealed state to a deflated state. At this time, the connecting rod 17 enters a second sliding state under the elastic reset member 21 and the self-gravity of the wire feeding block 9, and finally the wire feeding block 9 is reset to its initial position.

[0050] In order to prevent the sealing plug 35 from excessive movement, a limiting groove is opened in the connecting rod 17, and a limiting ring is coaxially fixed at the bottom of the connecting tube 36. When the connecting tube 36 slides on the top of the connecting rod 17, the limiting groove can limit the movement distance of the connecting tube 36 to prevent the sealing plug 35 from excessive movement.

[0051] refer to Figure 4 and Fig.10 As shown, to further supplement the structure of the card connection assembly, the card connection assembly also includes a moving rod 41 that is slidably connected to the card contact 10, and the end of the card connection block 12 away from the connecting groove 11 is set as an arc surface and has a card groove 42, and the cross-section of the card groove 42 is a T-shaped, spherical or regular polygonal structure. Two symmetrically distributed connecting strips 43 are fixedly connected to the moving rod 41, and a sliding rod 44 is fixed at the end of the connecting strip 43 away from the moving rod 41. The top of the sliding rod 44 is fixedly connected with a card block matching the card groove 42. When the top of the melting tube 2 is limited by the card contact 10, the moving rod 41 is squeezed by the melting tube 2 and moves upward, and the two sliding rods 44 move upward accordingly and bring the two card connection blocks 12 closer to each other.

[0052] refer to Fig.10 As shown, two symmetrically distributed sliding cavities 45 are provided in the card contact 10, and a sliding rod 46 is coaxially slidable in the sliding cavity 45. One end of the sliding rod 46 passes through the sliding cavity 45 and is fixedly connected to the top of the card block 12, and a positioning plate 47 is coaxially fixed to the other end of the sliding rod 46. Limiting cavities 48 are respectively provided on the tops of the two sliding cavities 45, and a limiting plate 49 is slidably connected to the limiting cavity 48 through a spring, and a plurality of equidistantly distributed one-way limiting teeth 50 are fixedly connected to the bottom of the limiting plate 49, and the spacing between each one-way limiting tooth 50 matches the thickness of the positioning plate 47.

[0053] One end of the two limiting plates 49 passing through the limiting cavity 48 is fixedly connected to a same connecting ring 51 .

[0054] During use, the fusion tube 2 is installed on the connecting arm 3 through the insulating rod. During installation, the ball head part of the ball head rod 28 is located in the movable channel 32, and then the fusion tube 2 is pushed to move to one side of the elastic arm 5. During the movement, the ball head rod 28 is displaced in the L-shaped tube 27, the piston member 26 is compressed downward and the gas in the inner cavity 24 enters the fixed rod 20 and the connecting rod 17, and the connecting rod 17 drives the wire feeding block 9 and the fuse to move upward. When the top of the fusion tube 2 is limited by the card contact 10, the moving rod 41 is squeezed by the fusion tube 2 and moves upward. At this time, the two card blocks 12 are pushed by the sliding rod 44 to approach each other and fix the fuse. The one-way limiting teeth 50 on the limiting plate 49 limit the positioning plate 47, thereby completing the fixation of the fuse. At the same time, when the wire feeding block 9 and the fuse move upward to the highest point, the sealing plug 35 is blocked by the retaining ring 40 and slides downward. When the air outlet channel 37 is connected with the L-shaped flow channel 38, the connecting rod 17 changes from a sealed state to a deflated state. At this time, the connecting rod 17 enters a second sliding state under the elastic reset member 21 and the self-gravity of the wire feeding block 9, and finally the wire feeding block 9 is reset to the initial position. Finally, when the fuse blows, the fuse tube 2 is separated from the elastic arm 5 and the card contact 10 and tilted to one side. The operator only needs to push the connecting ring 51 upward through the insulating rod, the positioning plate 47 will release the limit, and the two card blocks 12 will move away under the action of the spring, and the residual fuse after the blown will fall off by itself, and then the insulating rod can be used to push the fuse tube 2 to reset.

[0055] Through the arrangement of the wire feeding assembly, the actuator, the clamping assembly and the reset mechanism, when the staff performs the wire replacement and reset operation on the high drop-type fuse on the ground, they only need to push the connecting ring 51 upwards through the insulating rod to make the residual blown fuse fall off, and then push the fuse tube 2 again to reset it. During the resetting process of the fuse tube 2, the new fuse will be reconnected to the clamping assembly. The whole process does not require the staff to perform tedious operations on the fuse tube 2 and the fuse, which greatly improves the efficiency of the wire replacement and reset of the fuse. In particular, for large-scale power system faults, the reset efficiency of the fuse has a significant advantage.

[0056] Embodiment 2 Since the above embodiment uses a specially treated fuse, the fuse's fusing position can be controlled according to the change of the melting point, so that most fuses currently on the market do not meet the use conditions of the fuse, which limits the universality of the fuse to a certain extent. In view of the above problems, further improvements are made on the basis of the above embodiment.

[0057] refer to Fig.11 and Fig.12As shown, the fuse 6 includes a reducing assembly 52 and a metal wire 53. The metal wire 53 is a common fuse wire currently available on the market. The reducing assembly 52 includes a shell 54 coaxially fixed below the wire feeding block 9. A rotating drum 55 coaxially rotates in the shell 54. A positioning rod 56 is fixedly connected to the fuse tube 2. A spiral track is provided on the positioning rod 56. A connecting wheel 57 matching the threaded track is provided on the positioning rod 56. The connecting wheel 57 is connected to the rotating drum 55 through a synchronous belt transmission structure. A mounting block 58 is fixedly connected to the outer wall of the shell 54, and the mounting block 58 is rotatably connected to the connecting wheel 57.

[0058] refer to Fig.13 , Fig.14 and Fig.16 As shown, a plurality of arc blocks 59 evenly distributed around the circumference are fixedly connected to the inner wall of the rotating drum 55, an arc groove 60 is provided on the arc block 59, the cross section of the arc groove 60 is a spherical structure, a plurality of roller units matching the arc block 59 are arranged in the rotating drum 55, the roller unit includes a connecting frame 61 and a roller 62, a connecting shaft is coaxially fixed to the upper and lower ends of the roller 62, the connecting shaft is rotatably connected to the connecting frame 61, a connecting piece 63 matching the arc groove 60 is fixedly connected to one side of the connecting frame 61, and a slide groove matching the connecting shaft is provided on the upper and lower sides of the shell 54.

[0059] In order to strengthen the squeezing force of the roller 62 on the metal wire 53 and improve the diameter-changing effect of the metal wire 53 , a plurality of pressure strips evenly distributed around the circumference are provided on the outer wall of the roller 62 .

[0060] During use, when the wire feeding block 9 drives the shell 54 to move upward, the connecting wheel 57 moves and rotates on the positioning rod 56, and the rotating drum 55 rotates in the shell 54. At this time, the relative position of the arc block 59 and the connecting frame 61 changes, and the connecting frame 61 drives the roller 62 to approach the metal wire 53 and exerts a greater clamping force on the metal wire 53. As the rotating drum 55 rotates, the roller 62 continues to squeeze the metal wire 53, and finally the diameter of the metal wire 53 is reduced. The resistance of this section with a smaller diameter is higher, so it is more likely to fuse.

[0061] Through the arrangement of the shell 54, the rotating drum 55, the positioning rod 56 and the roller unit, after the conventional metal wire 53 is installed in the fuse tube 2, the reducing assembly 52 can extrude and reduce the diameter of the metal wire 53, so that the resistance of the reducing section is significantly increased, thereby realizing the control of the fusing position of the metal wire 53 and improving the universality of the fuse.

[0062] Embodiment 3 In order to further enhance the diameter-changing effect of the metal wire 53 and prevent the problem of elastic restoration of the metal wire 53 after extrusion.

[0063] refer to Fig.15 and Fig.16As shown, the roller 62 includes an upper rotating rod 64 at the upper half and a lower rotating rod 65 at the lower half, and the outer walls of the upper rotating rod 64 and the lower rotating rod 65 are respectively provided with thread strips 66 in mirror image.

[0064] During use, when the roller 62 squeezes the metal wire 53 while rotating, during the rotation of the roller 62, the threaded strips 66 provided on the upper rotating rod 64 and the lower rotating rod 65 respectively generate upward and downward pulling forces on the metal wire 53. At this time, the middle part of the diameter-changing section is stretched and deformed, thereby forming a fuse position with the smallest diameter.

[0065] By means of the upper rotating rod 64, the lower rotating rod 65 and the spiral strip, the metal wire 53 is subjected to lateral extrusion force as well as upward and downward pulling force, causing the metal wire 53 to be stretched and deformed, thereby further improving the diameter-changing effect of the metal wire 53 and avoiding the problem of elastic resetting of the metal wire 53.

[0066] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. An intelligent fuse, comprising an insulating support (1) and a fuse tube (2), wherein a connecting arm (3) is fixedly connected to the bottom of the insulating support (1), a static contact (4) matching the connecting arm (3) is arranged at the bottom of the fuse tube (2), and an elastic arm (5) is fixedly connected to the top of the insulating support (1), characterized in that: Also includes: a fuse (6), the fuse (6) being located in the fuse tube (2) and capable of performing a fusing action, the static contact (4) being fixedly connected to a conductive member (7) penetrating into the interior of the fuse tube (2), the conductive member (7) being in contact with the fuse (6); A winding assembly comprises a winding drum (8) located on one side of the melting tube (2), wherein a winding shaft is coaxially arranged inside the winding drum (8); A wire feeding assembly, comprising a wire feeding block (9) movable up and down in a fusion tube (2), the wire feeding block (9) having a first sliding state and a second sliding state, wherein in the first sliding state, the wire feeding block (9) drives the fusion element (6) to move upward, and in the second sliding state, the wire feeding block (9) is reset to an initial position, an actuator is provided at the bottom of the fusion tube (2) for driving the wire feeding block (9) to enter the first sliding state, and a reset mechanism is provided on the wire feeding assembly for causing the wire feeding block (9) to enter the second sliding state; The card connection assembly comprises a card contact (10) fixedly connected to an elastic arm (5), the card contact (10) being provided with a connection groove (11), and card blocks (12) being slidably connected to both sides of the connection groove (11), the card contact (10) and the card blocks (12) being both electrically conductive, and when the top of the fusion tube (2) approaches the card contact (10) and forms a limit position, the two card blocks (12) approach each other.

2. The intelligent fuse according to claim 1, characterized in that: The fuse (6) comprises a fuse, one end of which is wound on a reel and the other end of which is clamped to a wire feeding block (9), the fuse comprising a plurality of staggeredly arranged fuse parts (13) and conductive parts (14), the melting point of the fuse parts (13) being lower than the melting point of the conductive parts (14), and the melting points of the various fuse parts (13) vary in a step-like manner, with the melting point of the fuse part (13) close to the reel being the highest.

3. The intelligent fuse according to claim 1, characterized in that: An annular cavity (15) is provided in the wire feeding block (9), a clamping plate (16) is slidably connected in the annular cavity (15), the clamping plate (16) and the annular cavity (15) are connected via a spring, a connecting rod (17) is eccentrically provided on the wire feeding block (9), the connecting rod (17) is a hollow structure, the reset mechanism is located at the top of the connecting rod (17), the connecting rod (17) is provided with a branch pipe (18) located in the annular cavity (15), the clamping plate (16) is provided with a positioning cylinder (19) sealed and slidably connected to the branch pipe (18), the bottom of the connecting rod (17) is sealed and slidably connected with a fixing rod (20), the fixing rod (20) is a cylindrical structure with openings at both ends, and an elastic reset member (21) is provided between the fixing rod (20) and the wire feeding block (9).

4. The intelligent fuse according to claim 3, characterized in that: The actuator comprises an annular cylinder (22) coaxially fixed to the bottom of the melting tube (2), a partition (23) coaxially fixed inside the annular cylinder (22), the partition (23) partitioning the annular cylinder (22) into an inner cavity (24) and an outer cavity (25), the inner cavity (24) and the outer cavity (25) being connected to each other, the fixed rod (20) being fixedly connected to the top of the annular cylinder (22) and connected to the inner cavity (24), a piston member (26) sliding up and down is arranged in the outer cavity (25), an L-shaped tube (27) being fixedly connected to the bottom of the annular cylinder (22), the piston member (26) being sealingly slidably connected to the L-shaped tube (27), and a ball head rod (28) being sealingly slidably connected to one end of the L-shaped tube (27) away from the annular cylinder (22); The connecting arm (3) is provided with a mounting portion, the mounting portion comprising a mounting plate (29), a movable groove (30) being provided on the mounting plate (29), a connecting plate (31) being fixedly connected to one side of the mounting plate (29), a movable channel (32) being formed between the connecting plate (31) and the mounting plate (29), and a ball head portion of the ball head rod (28) being located in the movable channel (32); The top of the annular cylinder (22) is provided with an air hole communicating with the outer cavity (25), the bottom of the annular cylinder (22) is fixedly connected with an air intake pipe (33), a conical flow channel is provided in the air intake pipe (33), and a sealing ball (34) that moves up and down is provided in the conical flow channel.

5. The intelligent fuse according to claim 4, characterized in that: The reset mechanism comprises a sealing plug (35) located at the top of the connecting rod (17), the sealing plug (35) being sealingly and slidably connected to the connecting rod (17), a connecting tube (36) being fixedly connected to the bottom of the sealing plug (35) via a plurality of connecting columns, an air outlet channel (37) being formed between the sealing plug (35) and the connecting tube (36), a plurality of L-shaped flow channels (38) evenly distributed around the circumference being formed at the top of the connecting rod (17), a top rod (39) being coaxially fixed inside the fixing rod (20), and a retaining ring (40) being coaxially fixed to the top of the inner wall of the melting tube (2); A limiting groove is provided in the connecting rod (17), and a limiting ring is coaxially fixed on the bottom of the connecting cylinder (36).

6. The intelligent fuse according to claim 5, characterized in that: The card connection assembly further comprises a moving rod (41) slidably connected to the card contact (10); one end of the card connection block (12) away from the connection slot (11) is arranged as an arc surface and is provided with a card slot (42); two symmetrically distributed connecting strips (43) are fixedly connected to the moving rod (41); one end of the connecting strip (43) away from the moving rod (41) is fixed with a sliding rod (44); and the top of the sliding rod (44) is fixedly connected with a card block matching the card slot (42).

7. The intelligent fuse according to claim 6, characterized in that: The card contact (10) is provided with two symmetrically distributed sliding cavities (45), a sliding rod (46) is coaxially slidable in the sliding cavity (45), one end of the sliding rod (46) passes through the sliding cavity (45) and is fixedly connected to the top of the card block (12), and a positioning plate (47) is coaxially fixed to the other end of the sliding rod (46), and a limiting cavity (48) is respectively provided at the top of the two sliding cavities (45), and a limiting plate (49) is slidably connected to the limiting cavity (48) through a spring, and a plurality of unidirectional limiting teeth (50) distributed at equal intervals are fixedly connected to the bottom of the limiting plate (49), and the spacing of each unidirectional limiting tooth (50) matches the thickness of the positioning plate (47); One end of the two limiting plates (49) passing through the limiting cavity (48) is fixedly connected to the same connecting ring (51).

8. The intelligent fuse according to claim 7, characterized in that: The fuse (6) comprises a diameter-changing component (52) and a metal wire (53), the diameter-changing component (52) comprises a shell (54) coaxially fixed below the wire feeding block (9), a rotating drum (55) coaxially rotating in the shell (54), a positioning rod (56) fixedly connected in the melting tube (2), a spiral track provided on the positioning rod (56), a connecting wheel (57) matching the spiral track provided on the positioning rod (56), the connecting wheel (57) and the rotating drum (55) being connected via a synchronous belt transmission structure, a mounting block (58) fixedly connected to the outer wall of the shell (54), the mounting block (58) being rotationally connected to the connecting wheel (57); A plurality of arc blocks (59) evenly distributed around the circumference are fixedly connected to the inner wall of the rotating drum (55), and an arc groove (60) is provided on the arc block (59). The cross section of the arc groove (60) is a spherical structure. A plurality of roller units matching the arc blocks (59) are arranged in the rotating drum (55), and the roller units include a connecting frame (61) and rollers (62). A connecting piece (63) matching the arc groove (60) is fixedly connected to one side of the connecting frame (61), and sliding grooves matching the rollers are respectively provided on the upper and lower sides of the housing (54).

9. The intelligent fuse according to claim 8, characterized in that: The outer wall of the roller (62) is provided with a plurality of pressure strips evenly distributed around the circumference.

10. The intelligent fuse according to claim 8, characterized in that: The roller (62) comprises an upper rotating rod (64) at the upper half and a lower rotating rod (65) at the lower half, wherein the outer walls of the upper rotating rod (64) and the lower rotating rod (65) are respectively provided with thread strips (66) in a mirror-like manner.

Images