A high-voltage drop-out fuse

Abstract

This invention relates to a high-voltage drop-out fuse, comprising a high-strength porcelain insulator, upper and lower terminals detachably mounted at both ends of the high-strength porcelain insulator, a rain cover detachably mounted on the upper terminal, a copper spring fixedly connected to the rain cover, a cast copper base detachably mounted on the lower terminal, a fuse tube detachably mounted between the copper spring and the cast copper base, and a fuse wire disposed inside the fuse tube. A control sleeve is provided inside the fuse tube, which centrally positions and maintains absolute tension of the portion of the fuse wire located inside the fuse tube. The fuse wire inside the fuse tube has a stable working posture, and the fuse wire will not easily contact the inner wall and end of the fuse tube when the device shakes. Furthermore, the portion of the fuse wire exposed outside the fuse tube will not be worn or cut by the end of the control plate due to shaking.

Description

Technical Field

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

[0002] Currently available high-voltage drop-out fuses typically employ simple suspension or two-end fixing installation methods for the fuse wire inside the fuse tube, lacking a dedicated positioning structure to constrain the fuse wire in the middle section within the fuse tube. This design has significant drawbacks: Firstly, when the fuse is subjected to external environmental factors such as strong winds, line vibrations, or minor impacts during equipment maintenance, the fuse wire inside the fuse tube is prone to shifting and swinging, potentially contacting the inner wall or end of the fuse tube. Since the fuse wire carries a certain current and generates heat during normal operation, contact with the inner wall of the fuse tube leads to uneven heat conduction. This can not only alter the normal temperature rise curve of the fuse wire, affecting the accuracy of its overload protection threshold, but also accelerate the aging of the fuse wire due to frictional wear at the contact points, shortening its service life. Secondly, the section of the fuse wire exposed outside the fuse tube is prone to repeated friction with or even breakage at the end of the fuse during device vibration. This wear directly reduces the effective cross-sectional area of ​​the fuse, decreasing its actual current-carrying capacity. This may cause the fuse to melt prematurely before reaching the designed protection current, resulting in unnecessary power outages. Alternatively, when a fault current occurs, the fuse may not be strong enough or the melting speed may be slow, making it impossible to disconnect the faulty line in time, thus expanding the scope of the accident and posing a serious threat to the safety of power grid equipment and surrounding personnel. Summary of the Invention

[0003] In order to solve the above-mentioned problems in the existing technology, the present invention aims to provide a high-voltage drop-out fuse.

[0004] The technical solution adopted in this invention is as follows:

[0005] A high-voltage drop-out fuse includes a high-strength porcelain insulator, an upper terminal and a lower terminal detachably mounted at both ends of the high-strength porcelain insulator, a rain cover detachably mounted on the upper terminal, a copper spring fixedly connected to the rain cover, a cast copper base detachably mounted on the lower terminal, a fuse tube detachably mounted between the copper spring and the cast copper base, and a fuse wire disposed inside the fuse tube;

[0006] Two control sleeves are slidably provided on the inner wall of the fuse tube away from the rain cover. The two control sleeves form a guide cone and a clamping part on the side close to each other. The sliding direction of the two control sleeves is perpendicular to the axis of the fuse tube. When the guide cone is squeezed, it controls the two control sleeves to open and guide the fuse wire through the control sleeve. The two clamping parts clamp the fuse wire when the two control sleeves are closed.

[0007] As a preferred embodiment of the present invention, a mounting bracket is fixedly provided on one side of the high-strength porcelain insulator, and an upper mounting plate and a lower mounting plate are fixedly provided at both ends of the high-strength porcelain insulator, respectively. The upper mounting plate is connected to the upper terminal block and the rain cover by bolts, and the lower mounting plate is connected to the cast copper base by bolts.

[0008] As a preferred embodiment of the present invention, a spring is provided on the side of the rain cover away from the upper mounting plate, and the two ends of the spring are fixedly connected to the inner wall of the rain cover and the copper spring sheet respectively. A fixing bracket is provided on the side of the copper spring sheet near the upper mounting plate and is fixedly connected to the rain cover. A load hook is fixedly provided on the side of the fixing bracket away from the upper mounting plate.

[0009] As a preferred embodiment of the present invention, an upper sleeve is fixedly provided at one end of the fuse tube near the rain cover, a pull ring is fixedly provided on the side of the upper sleeve away from the high-strength porcelain insulator, a threaded connection is formed at one end of the upper sleeve near the rain cover, a conductive cap is detachably installed on the threaded connection, and a groove is provided on the side of the copper spring away from the rain cover, the conductive cap and the groove of the copper spring are engaged.

[0010] As a preferred embodiment of the present invention, a lower sleeve is fixedly provided at the end of the fuse tube away from the rain cover, an extension is formed on the side of the lower sleeve near the lower mounting plate, a trunnion is fixedly provided on the side of the extension near the lower mounting plate, the cast copper base includes a mounting part that is connected to the lower terminal block and the lower mounting plate by bolts, an abutment part is formed on the side of the mounting part away from the lower mounting plate, and the trunnion and the abutment part cooperate.

[0011] As a preferred embodiment of the present invention, the end of the fusible wire near the rain cover forms a wire buckle, the wire buckle is located between the threaded connection and the conductive cap, the lower sleeve is fixedly provided with a fixing plate on the side near the lower mounting plate, and the end of the fusible wire away from the rain cover passes through the lower sleeve and is connected to the fixing plate by bolts.

[0012] As a preferred embodiment of the present invention, a tensioning member is rotatably provided on the side of the extension near the lower mounting plate. The tensioning member is connected to the extension via a torsion spring. A control plate is fixedly provided at one end of the tensioning member, and the end of the control plate away from the tensioning member abuts against the fuse wire.

[0013] As a preferred embodiment of the present invention, a second spring is provided between the two control sleeves, and the two ends of the second spring are respectively fixedly connected to the inner walls of the two control sleeves. The guide cone includes an upper conical part and a lower conical part. The upper conical part is used to guide the fuse wire. A top sleeve is slidably provided at the end of the lower sleeve away from the rain cover. The top sleeve is used to squeeze the lower conical part.

[0014] As a preferred embodiment of the present invention, a sliding groove is provided on the inner wall of the lower sleeve, a plurality of guide ribs are fixedly provided on the periphery of the trunnion, the guide ribs are slidably connected to the sliding groove, and a pressure pad is fixedly provided at the end of the top sleeve away from the rain cover, the pressure pad cooperating with the control plate.

[0015] As a preferred embodiment of the present invention, a limiting ring is fixedly provided on the inner wall of the side of the fuse tube away from the rain cover, and an inner sealing ring is fixedly provided at the end of the fuse tube away from the rain cover, and the control sleeve is located between the limiting ring and the inner sealing ring.

[0016] The beneficial effects of this invention are as follows: As a high-voltage drop-out fuse, this invention has a control sleeve installed inside the fuse tube. The control sleeve keeps the part of the fuse wire inside the fuse tube centrally positioned and kept absolutely taut. The fuse wire inside the fuse tube has a stable working posture. When the device shakes, the fuse wire will not easily contact the inner wall and end of the fuse tube. Furthermore, the part of the fuse wire exposed outside the fuse tube will not be worn or cut by the end of the control plate due to shaking. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is the present invention. Figure 1 A front view structural diagram;

[0020] Figure 3 This is the present invention. Figure 1 A schematic diagram of the exploded structure;

[0021] Figure 4 This is the present invention. Figure 3 Enlarged schematic diagram of part of the structure;

[0022] Figure 5 This is the present invention. Figure 1 A schematic diagram of the fuse tube structure;

[0023] Figure 6 This is the present invention. Figure 5 A cross-sectional structural diagram. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0025] Combination Figures 1-6 A high-voltage drop-out fuse includes a high-strength porcelain insulator 11, an upper terminal 13 and a lower terminal 16 detachably mounted at both ends of the high-strength porcelain insulator 11, a rain cover 14 detachably mounted on the upper terminal 13, a copper spring 15 fixedly connected to the rain cover 14, a cast copper base 17 detachably mounted on the lower terminal 16, a fuse tube 18 detachably mounted between the copper spring 15 and the cast copper base 17, and a fuse wire 30 disposed inside the fuse tube 18. During operation, in normal operation, the circuit is open and the fuse tube 18 is locked. In a fault-induced fuse state, the fuse wire 30 melts, the fuse tube 18 drops, and the circuit is broken.

[0026] Two control sleeves 31 are slidably provided on the inner wall of the fuse tube 18 away from the rain cover 14. A guide cone 35 and a clamping part 36 are formed on the side of the two control sleeves 31 that are close to each other. The sliding direction of the two control sleeves 31 is perpendicular to the axis of the fuse tube 18. When the guide cone 35 is compressed, it controls the two control sleeves 31 to open and guide the fuse wire 30 through the control sleeve 31. The two clamping parts 36 clamp the fuse wire 30 when the two control sleeves 31 are closed. The guide cone 35 of the control sleeve 31 can be designed to be hollow according to operational requirements, without affecting the circuit disconnection method in the event of a fault fuse failure.

[0027] Advantageously, a mounting bracket 12 is fixedly provided on one side of the high-strength porcelain insulator 11, and an upper mounting plate 19 and a lower mounting plate 20 are respectively fixed at both ends of the high-strength porcelain insulator 11. The upper mounting plate 19 is connected to the upper terminal block 13 and the rain cover 14 by bolts, and the lower mounting plate 20 is connected to the lower terminal block 16 and the cast copper base 17 by bolts. The upper terminal block 13 and the lower terminal block 16 are also connected to the high-voltage power line by bolted terminals.

[0028] Advantageously, a spring 22 is provided on the side of the rain cover 14 away from the upper mounting plate 19. The two ends of the spring 22 are fixedly connected to the inner wall of the rain cover 14 and the copper spring sheet 15, respectively. A fixing bracket 21, fixedly connected to the rain cover 14, is provided on the side of the copper spring sheet 15 near the upper mounting plate 19. A load hook 24 is fixedly provided on the side of the fixing bracket 21 away from the upper mounting plate 19. The rain cover 14 is mainly used to prevent rainwater intrusion and is a key protective component designed for harsh outdoor environments, ensuring the normal operation of the device.

[0029] Advantageously, an upper sleeve 27 is fixedly provided at one end of the fuse tube 18 near the rain cover 14. A pull ring 29 is fixedly provided on the side of the upper sleeve 27 away from the high-strength porcelain insulator 11. A threaded connection portion 26 is formed at the end of the upper sleeve 27 near the rain cover 14. A conductive cap 25 is detachably installed on the threaded connection portion 26. A groove is provided on the side of the copper spring 15 away from the rain cover 14. The conductive cap 25 and the groove of the copper spring 15 are engaged. The pull ring 29 enables manual on / off operation, providing a precise force point for manual operation.

[0030] Advantageously, a lower sleeve 32 is fixedly provided at the end of the fuse tube 18 away from the rain cover 14. An extension 46 is formed on the side of the lower sleeve 32 near the lower mounting plate 20. A trunnion 47 is fixedly provided on the side of the extension 46 near the lower mounting plate 20. The cast copper base 17 includes a mounting part 33 connected to the lower terminal 16 and the lower mounting plate 20 by bolts. An abutment part 34 is formed on the side of the mounting part 33 away from the lower mounting plate 20. The trunnion 47 and the abutment part 34 cooperate. The trunnion 47 serves as a fixed rotation fulcrum, making the drop isolation and manual on / off action of the fuse tube 18 controllable and reliable.

[0031] Advantageously, the end of the fusible link 30 near the rain cover 14 forms a loop 28, which is located between the threaded connection 26 and the conductive cap 25. A fixing plate 44 is fixedly mounted on the side of the lower sleeve 32 near the lower mounting plate 20. The end of the fusible link 30 away from the rain cover 14 passes through the lower sleeve 32 and is connected to the fixing plate 44 by bolts. The loop 28 is conductive, its purpose being to secure one end of the fusible link 30, facilitating operation on the other end.

[0032] Advantageously, a tensioning member 40 is rotatably provided on the side of the extension 46 near the lower mounting plate 20. The tensioning member 40 is connected to the extension 46 via a torsion spring. A control plate 41 is fixedly provided at one end of the tensioning member 40, and the end of the control plate 41 away from the tensioning member 40 abuts against the fuse wire 30. The tensioning member 40 tends to remain vertical. After the fuse wire 30 is installed, the tensioning member 40 tends to reset, tilting up and lifting the fuse wire 30 to keep it taut.

[0033] Advantageously, a second spring 43 is provided between the two control sleeves 31, with both ends of the second spring 43 fixedly connected to the inner walls of the two control sleeves 31 respectively. The guide cone 35 includes an upper conical part and a lower conical part. The upper conical part is used to guide the fuse wire 30. A top sleeve 37 is slidably provided at the end of the lower sleeve 32 away from the rain cover 14. The top sleeve 37 is used to compress the lower conical part. The two control sleeves 31 are of a slightly curved arc shape and are not complete cylinders when closed. There is an operating space between them, allowing the fuse wire 30 to pass through. The diameter of the circle containing the cross-section of the control sleeve 31 is smaller than the inner diameter of the fuse tube 18, allowing the control sleeve 31 to slide inside the fuse tube 18.

[0034] Advantageously, the inner wall of the lower sleeve 32 is provided with a sliding groove 48, and a plurality of guide ribs 38 are fixedly provided on the periphery of the trunnion 47. The guide ribs 38 are slidably connected to the sliding groove 48. A pressure pad 39 is fixedly provided at the end of the top sleeve 37 away from the rain cover 14. The pressure pad 39 cooperates with the control plate 41. The sliding groove 48 does not penetrate the lower sleeve 32, and the pressure pad 39 will not fall off when not subjected to external force.

[0035] Advantageously, a limiting ring 49 is fixedly provided on the inner wall of the side of the fusible tube 18 away from the rain cover 14, and an inner sealing ring is fixedly provided at the end of the fusible tube 18 away from the rain cover 14. The control sleeve 31 is located between the limiting ring 49 and the inner sealing ring. The inner sealing ring and the limiting ring 49 restrict the sliding range of the control sleeve 31 and guide the control sleeve 31 to slide along a specified path.

[0036] Working principle of this invention:

[0037] In the initial state, the fuse wire 30 is not installed, and the torsion spring 45 tends to keep the control plate 41 parallel to the axis of the fuse tube 18.

[0038] First, disassemble the fuse tube 18, pull the pull ring 29 to make the fuse tube 18 rotate around the trunnion 47, overcome the elastic force of the spring 22, and the conductive cap 25 disengages from the groove of the copper spring 15.

[0039] Then unscrew the conductive cap 25 to separate the conductive cap 25 from the threaded connection part 26, insert one end of the fuse wire 30 into the threaded connection part 26, so that the wire clip 28 abuts against the threaded connection part 26, and screw the conductive cap 25 back on, so that the wire clip 28 is clamped between the threaded connection part 26 and the conductive cap 25.

[0040] Keeping the fuse tube 18 vertical, the tensioner 40 is moved to overcome the spring force of the torsion spring 45, causing the tensioner 40 to rotate around the axis of the trunnion 47, making the control plate 41 tend to be horizontal. The control plate 41 presses against the pressure pad 39, causing the pressure pad 39, guide rib 38, and top sleeve 37 to move together. The guide rib 38 and the slide groove 48 slide together. The end of the top sleeve 37 presses against the lower conical part of the guide cone 35, causing the two control sleeves 31 to separate and overcome the spring force of the second spring 43. The two clamps... Increase the distance between the holding parts 36 to allow the freely drooping fuse wire 30 to pass through. Gently shake the fuse tube 18 until the end of the fuse wire 30 away from the wire buckle 28 passes through the guide cone 35 and the clamping part 36 and exposes the bottom of the fuse tube 18. Keep the control plate 41 in an approximately horizontal state and keep the fuse wire 30 relatively taut. Bend the fuse wire 30 and press it against the control plate 41. Wrap the end of the fuse wire 30 around the terminal block of the fixing plate 44 and fix it with bolts.

[0041] After the fuse wire 30 and fuse tube 18 are installed, the external force applied to the tensioner 40 is removed. Under the action of the torsion spring 45, the tensioner 40 rotates slightly, and the control plate 41 tilts up to keep the fuse wire 30 absolutely taut. During this process, the control plate 41 no longer squeezes the pressure pad 39, and the two control sleeves 31 are reset under the action of the second spring 43, and the clamping part 36 clamps the fuse wire 30. The top sleeve 37, guide rib 38, and pressure pad 39 are forced to reset. At this time, the part of the fuse wire 30 inside the fuse tube 18 is centered and remains absolutely taut. The fuse tube 18 has a stable working posture. When the device shakes, the fuse wire 30 will not easily contact the inner wall and end of the fuse tube 18, and the part of the fuse wire 30 exposed outside the fuse tube 18 will not be worn or cut by the end of the control plate 41 due to shaking.

[0042] Finally, the trunnion 47 is engaged with the abutment part 34, and the fuse tube 18 is rotated around the trunnion 47 so that the conductive cap 25 and the groove of the copper spring 15 are aligned again, and the high-voltage drop-out fuse can work normally.

[0043] During operation, the high-voltage drop-out fuse is normally in operation with the circuit connected and the fuse element tube 18 locked. In the event of a fault, the fuse wire 30 melts, the fuse element tube 18 drops, and the circuit is broken.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high voltage drop-out fuse characterized by: It includes a high-strength porcelain insulator, an upper terminal and a lower terminal that are detachably installed at both ends of the high-strength porcelain insulator, a rain cover that is detachably installed on the upper terminal, a copper spring that is fixedly connected to the rain cover, a cast copper base that is detachably installed on the lower terminal, a fuse tube that is detachably installed between the copper spring and the cast copper base, and a fuse wire disposed inside the fuse tube; Two control sleeves are slidably provided on the inner wall of the fuse tube away from the rain cover. The two control sleeves form a guide cone and a clamping part on the side that is close to each other. The sliding direction of the two control sleeves is perpendicular to the axis of the fuse tube. When the guide cone is squeezed, it controls the two control sleeves to open and guide the fuse wire through the control sleeve. The two clamping parts clamp the fuse wire when the two control sleeves are closed. The high-strength porcelain insulator has an upper mounting plate and a lower mounting plate fixed at both ends. A lower sleeve is fixed at the end of the fusible link tube away from the rain cover. An extension is formed on the side of the lower sleeve near the lower mounting plate. A tensioning member is rotatably mounted on the side of the extension near the lower mounting plate. The tensioning member is connected to the extension via a torsion spring. A control plate is fixed at one end of the tensioning member, and the end of the control plate away from the tensioning member abuts against the fusible link. A second spring is provided between the two control sleeves, with both ends fixedly connected to the inner walls of the two control sleeves. The guide cone includes an upper conical part and a lower conical part. The upper conical part guides the fusible link. A top sleeve is slidably mounted at the end of the lower sleeve away from the rain cover, and the top sleeve compresses the lower conical part. A groove is provided on the inner wall of the lower sleeve. Multiple guide ribs are fixedly mounted around the periphery of the top sleeve, and the guide ribs are slidably connected to the groove. A pressure pad is fixedly mounted at the end of the top sleeve away from the rain cover, and the pressure pad cooperates with the control plate.

2. The high-voltage drop-out fuse according to claim 1, characterized in that: A mounting bracket is fixedly provided on one side of the high-strength porcelain insulator. The upper mounting plate is connected to the upper terminal block and the rain cover by bolts, and the lower mounting plate is connected to the cast copper base by bolts.

3. A high-voltage drop-out fuse according to claim 2, characterized in that: A spring is provided on the side of the rain cover away from the upper mounting plate. The two ends of the spring are fixedly connected to the inner wall of the rain cover and the copper spring sheet, respectively. A fixing bracket is provided on the side of the copper spring sheet near the upper mounting plate, which is fixedly connected to the rain cover. A load hook is fixedly provided on the side of the fixing bracket away from the upper mounting plate.

4. A high-voltage drop-out fuse according to claim 2, characterized in that: The fuse tube is fixedly provided with an upper tube sleeve at one end near the rain cover. A pull ring is fixedly provided on the side of the upper tube sleeve away from the high-strength porcelain insulator. A threaded connection is formed at one end of the upper tube sleeve near the rain cover. A conductive cap is detachably installed on the threaded connection. A groove is provided on the side of the copper spring away from the rain cover. The conductive cap and the groove of the copper spring are engaged.

5. A high-voltage drop-out fuse according to claim 4, characterized in that: The extension is fixedly provided with a trunnion on the side near the lower mounting plate. The cast copper base includes a mounting part that is connected to the lower terminal and the lower mounting plate by bolts. The side of the mounting part away from the lower mounting plate forms an abutment part, and the trunnion and the abutment part cooperate.

6. A high-voltage drop-out fuse according to claim 5, characterized in that: The end of the fusible wire near the rain cover forms a wire buckle, which is located between the threaded connection and the conductive cap. A fixing plate is fixedly provided on the side of the lower sleeve near the lower mounting plate. The end of the fusible wire away from the rain cover passes through the lower sleeve and is connected to the fixing plate by bolts.

7. A high-voltage drop-out fuse according to claim 1, characterized in that: A limiting ring is fixedly provided on the inner wall of the side of the fuse tube away from the rain cover, and an inner sealing ring is fixedly provided at the end of the fuse tube away from the rain cover. The control sleeve is located between the limiting ring and the inner sealing ring.

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