A fuse device for transformer protection

Abstract

This invention relates to the field of fuse equipment technology, and discloses a fuse device for transformer protection, including an insulator, a mounting foot fixedly connected to the middle of the insulator, a lower connecting seat fixedly connected to the right end of the insulator, and an upper connecting seat fixedly connected to the left end of the insulator. In this invention, when an overload current passes through the fuse wire inside the fuse tube, the fuse wire inside the fuse tube melts. At this time, under the potential energy of the torsion spring, the rotating plate resets clockwise, and the elastic potential energy of the compression spring drives the fuse tube on the connecting sleeve to slide downwards along the fixed sleeve. At this time, the contact at the upper end of the fuse tube quickly disengages from the top end piece, preventing the upper contact on the contact piece from getting stuck in the positioning groove, ensuring that the drop-out fuse quickly trips.

Description

Technical Field

[0001] This invention relates to the field of fuse equipment technology, specifically a fuse device for transformer protection. Background Technology

[0002] A drop-out fuse is a type of high-voltage fuse (typically used in 6kV~35kV power distribution systems). When the current exceeds the set value or a short circuit occurs, the fuse wire melts, and the fuse tube automatically drops under the action of gravity, forming a clear break point. It has both overload / short circuit protection and isolation functions.

[0003] Existing drop-out high-voltage fuses can basically meet the requirements of transformer use. After the fuse in the existing fuse blows, the fuse tube on the fuse tube will drop in the direction of breaking the circuit under its own gravity. However, due to the large squeezing force at the contact connection, the fuse tube's own gravity makes the contact rotation and drop relatively slow. Therefore, this invention proposes a solution to the slow overcurrent breaking speed of fuses. Summary of the Invention

[0004] The purpose of this invention is to provide a fuse device for transformer protection to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to a fuse device for transformer protection, comprising an insulator, a mounting foot fixedly connected to the middle of the insulator, a lower connecting seat fixedly connected to the right end of the insulator, and an upper connecting seat fixedly connected to the left end of the insulator, and further comprising: The mounting part is installed on top of the lower connector. The mounting part provides a mounting base and also helps to ensure a tighter connection at the fuse joint. The connecting part is installed directly above the end of the insulator away from the mounting part. The connecting part makes the circuit conductive by pressing against the end of the mounting part. During installation, the mounting part moves the connecting part, making the connection more precise.

[0006] Furthermore, the installation section includes: The lower connector is installed on the top of the lower connector base and is used to connect wires. The rotating clamping component is installed inside the lower connector. The rotating clamping component is slidably installed inside the lower connector. By rotating the rotating clamping component, the connection between the lower connector and the rotating clamping component is squeezed. The tensioning element is installed directly above the rotating clamping element and is used to tighten the internal components of the fuse. The auxiliary component is installed directly above the rotating clamping component. The rotation of the clamping component causes the auxiliary component to slide.

[0007] Furthermore, the lower connector includes a connecting base fixedly connected to the top of the lower connector seat. The top of the connecting base is provided with several rotating grooves. A conductor plate is fixedly connected to the connecting base. The bottom of the conductor plate is provided with a lower connector for connecting wires. The top of the conductor plate is provided with several elastic stationary contacts. The elastic stationary contacts are elastic conductive metal sheets that are tilted upwards in the normal state.

[0008] Furthermore, the rotating clamping component includes a connecting rod positioned directly above the connecting base. A groove is provided at one end of the connecting rod near the lower connecting base, and a convex moving contact is fixedly connected to the other end of the connecting rod near the connecting base. A rotating column rotatably passes through the convex moving contact, and the rotating column is rotatably connected inside the rotating groove at the top of the connecting base.

[0009] Furthermore, the tensioning component includes a sliding groove formed on the side wall of the connecting rod, a sliding column is slidably connected inside the sliding groove, a connecting sleeve is fixedly connected to the sliding column, a fusible tube is fixedly connected to the connecting sleeve, and a fusible wire is provided inside the fusible tube; The bottom of the connecting rod is fixedly connected to a fixing plate, and the bottom of the fixing plate is threaded with a fastening bolt. The fastening bolt is used to fix one end of the fuse. The middle of the rotating column is rotatably fixedly connected to a rotating plate, and a torsion spring is sleeved in the middle of the rotating column. One end of the torsion spring is engaged with one side of the rotating plate, and the other end of the torsion spring is engaged with the surface of the convex moving contact.

[0010] Furthermore, the auxiliary component includes a fixed sleeve that is fixedly connected to the end of the connecting rod away from the convex moving contact, and the fusible tube is slidably connected inside the fixed sleeve.

[0011] Furthermore, a compression spring is fitted on one end of the fixed sleeve near the melting tube, a compression wedge is provided on one side of the rotating plate, a compression push rod is slidably connected to one end of the connecting rod, and the end of the compression push rod away from the compression wedge is fixedly connected to the sliding column.

[0012] Furthermore, the connecting part includes: The contact element is installed at the end of the fusible tube away from the mounting part. The contact element is used to fix the fuse wire inside the fusible tube. The top part is installed directly above the upper connector and is used to engage with the contact part for compression connection.

[0013] Furthermore, the contact element includes an upper contact threadedly connected to the end of the fusible tube away from the mounting portion, and a pull ring is fixedly connected to the side wall of the end of the fusible tube near the upper contact.

[0014] Furthermore, the top part includes an upper base fixedly connected to the top of the upper connector, a conductive rod fixedly connected to the upper base, an upper connector head provided at the bottom of the conductive rod, a pressing contact provided at the top of the conductive rod, a pressure spring fixedly connected to the side of the pressing contact near the upper base, and a positioning groove provided on the side of the pressing contact away from the pressure spring.

[0015] The present invention has the following beneficial effects: (1) In this invention, when the fuse wire in the fuse is subjected to an overload current, the fuse wire inside the fuse tube melts. At this time, under the action of the potential energy of the torsion spring, the rotating plate resets clockwise, and the elastic potential energy of the compression spring drives the fuse tube on the connecting sleeve to slide down along the fixed sleeve. At this time, the contact piece at the upper end of the fuse tube quickly separates from the top piece, avoiding the upper contact piece on the contact piece from getting stuck in the positioning groove, thus ensuring that the drop-out fuse can quickly trip.

[0016] (2) In this invention, by setting up an installation part, the rotating plate inside the tensioning part is first manually pushed to rotate counterclockwise upward along the rotating column until the extrusion block on one side of the rotating plate is pushed into the groove inside the connecting rod. At this time, one end of the fuse inside the fuse tube is fixed to the fixing plate by the fastening bolt. The torsion spring is driven by the rotation of the rotating plate to increase its potential energy. Under the drive of the potential energy of the torsion spring, the fuse is tightened, thereby ensuring that the rotating plate can generate a rebound after the fuse melts due to overcurrent.

[0017] (3) In this invention, by setting a lower connecting piece, when the fuse is closed, the fuse tube rotates and drives the rotating column at the bottom of the connecting rod to rotate inside the rotating groove. At this time, the convex moving contact on the rotating column is pressed against the elastic stationary contact on the lower connecting piece. Since the convex moving contact is a convex block, as the rotation angle of the convex moving contact increases, the degree of compression of the convex moving contact against the elastic stationary contact increases. When the other end of the fuse tube is closed, the compression force between the convex moving contact and the elastic stationary contact is the greatest. This setting is conducive to ensuring that the connection of the fuse is more stable.

[0018] (4) In this invention, by setting an auxiliary component, when the rotating plate inside the tensioning component is manually pushed to rotate counterclockwise upward along the rotating column until the squeezing inclined block on one side of the rotating plate is pushed into the groove inside the connecting rod, the squeezing inclined block on one side of the rotating plate squeezes the squeezing push rod. The squeezing push rod is squeezed and drives the sliding column to slide along the sliding groove. The sliding groove drives the fuse tube on the connecting sleeve to slide. This setting makes the contact at one end of the fuse tube closer to the top part, thereby making the squeezing force between the contact and the top part greater when the fuse is closed, thus ensuring the stable conductivity of the fuse.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective; Figure 3 This is a schematic diagram of the lower connector structure of the present invention; Figure 4 This is a schematic diagram of the conductor plate structure of the present invention; Figure 5 This is a schematic diagram of the rotating clamping component structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of A in the middle; Figure 7 This is a schematic diagram of the tensioning component structure of the present invention; Figure 8 This is a schematic diagram of the auxiliary component structure of the present invention; Figure 9 This is a schematic diagram of the top part structure of the present invention.

[0022] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Insulator; 11. Mounting foot; 12. Lower connector; 13. Upper connector; 2. Mounting part; 21. Lower connector; 211. Connecting base; 212. Rotating groove; 213. Conductor plate; 214. Lower connector; 215. Resilient stationary contact; 22. Rotating clamping element; 221. Connecting rod; 222. Convex moving contact; 223. Rotating column; 23. Tensioning element; 231. Sliding groove; 232. Sliding column; 233. Connecting sleeve; 234. Fusible tube; 23 5. Fuse; 236. Fixing plate; 237. Rotating plate; 238. Fastening bolt; 239. Torsion spring; 24. Auxiliary component; 241. Fixing sleeve; 242. Compression spring; 243. Compression wedge; 244. Compression push rod; 3. Connecting part; 31. Contact component; 311. Upper contact; 312. Pull ring; 32. Top part; 321. Conductive rod; 322. Upper connector; 323. Compression contact; 324. Pressure spring; 325. Positioning groove; 326. Upper base. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1, please refer to Figures 1-8 As shown, the present invention is a fuse device for transformer protection, including an insulator 1, a mounting foot 11 fixedly connected to the middle of the insulator 1, a lower connecting seat 12 fixedly connected to the right end of the insulator 1, and an upper connecting seat 13 fixedly connected to the left end of the insulator 1, and further including: Mounting part 2 is mounted on the top of the lower connecting seat 12. Mounting part 2 provides a mounting base and also helps to ensure a tighter connection at the fuse joint. The connecting part 3 is installed directly above the end of the insulator 1 away from the mounting part 2. The connecting part 3 makes the circuit conductive by pressing against the end of the mounting part 2. During the installation process, the mounting part 2 drives the connecting part 3 to move, making the connection of the connecting part 3 more precise. When using the fuse, the fuse is installed vertically on the transformer, with the upper connecting seat 13 at the top and the lower connecting seat 12 at the bottom.

[0025] Installation unit 2 includes: The lower connector 21 is installed on the top of the lower connector 12 and is used to connect wires. Rotate the clamping member 22. The rotating clamping member 22 is installed inside the lower end connector 21. The rotating clamping member 22 is slidably installed inside the lower end connector 21. By rotating the rotating clamping member 22, the connection between the lower end connector 21 and the rotating clamping member 22 is squeezed. Tensioning member 23 is installed directly above rotating clamping member 22 and is used to tension the internal components of the fuse. The auxiliary component 24 is installed directly above the rotating clamping component 22. The rotation of the tensioning component 23 causes the auxiliary component 24 to slide.

[0026] The lower connector 21 includes a connecting base 211 fixedly connected to the top of the lower connector 12. The top of the connecting base 211 is provided with several rotating grooves 212. A conductor plate 213 is fixedly connected to the connecting base 211. The bottom of the conductor plate 213 is provided with a lower connector 214 for connecting wires. The top of the conductor plate 213 is provided with several elastic static contacts 215. The elastic static contacts 215 are elastic conductive metal sheets that are tilted upwards in the normal state.

[0027] The rotating clamping component 22 includes a connecting rod 221 located directly above the connecting base 211. A groove is provided at one end of the connecting rod 221 near the lower connecting seat 12. A convex moving contact 222 is fixedly connected to one end of the connecting rod 221 near the connecting base 211. A rotating column 223 rotatably passes through the convex moving contact 222. The rotating column 223 is rotatably connected inside the rotating groove 212 at the top of the connecting base 211.

[0028] The tensioning component 23 includes a sliding groove 231 formed on the side wall of the connecting rod 221. A sliding column 232 is slidably connected inside the sliding groove 231. A connecting sleeve 233 is fixedly connected to the sliding column 232. A fuse tube 234 is fixedly connected to the connecting sleeve 233. A fuse wire 235 is provided inside the fuse tube 234. The function of this component is that, by setting the lower connecting component 21, when the fuse is closed, the fuse tube 234 rotates, causing the rotating column 223 at the bottom of the connecting rod 221 to rotate inside the rotating groove 212. When the fuse is rotated, the convex moving contact 222 on the rotating column 223 is pressed against the elastic stationary contact 215 on the lower end connector 21. Since the convex moving contact 222 is a protrusion, as the rotation angle of the convex moving contact 222 increases, the degree of compression of the convex moving contact 222 against the elastic stationary contact 215 increases. When the other end of the fuse tube 234 is closed, the compressive force between the convex moving contact 222 and the elastic stationary contact 215 is at its maximum. This arrangement helps to ensure a more stable connection of the fuse.

[0029] The bottom of the connecting rod 221 is fixedly connected to a fixing plate 236, and the bottom of the fixing plate 236 is threadedly connected to a fastening bolt 238. The fastening bolt 238 is used to fix one end of the fuse 235. The middle part of the rotating column 223 is rotatably fixedly connected to a rotating plate 237, and the middle part of the rotating column 223 is fitted with a torsion spring 239. One end of the torsion spring 239 is engaged with one side of the rotating plate 237, and the other end of the torsion spring 239 is engaged with the surface of the convex moving contact 222. The function of this component is that when the fuse 235 in the fuse is subjected to an overload current, the fuse 235 inside the fuse tube 234 melts. At this time, under the potential energy of the torsion spring 239, the rotating plate 237 resets clockwise, and the fuse tube 234 on the connecting sleeve 233 slides downward. At this time, the contact 31 at the upper end of the fuse tube 234 quickly disengages from the top end 32 to prevent the contact 31 from getting stuck inside the top end 32, thus ensuring that the drop-out fuse trips quickly.

[0030] The auxiliary component 24 includes a fixed sleeve 241 fixedly connected to the end of the connecting rod 221 away from the convex moving contact 222, and a slidably connected fuse tube 234 inside the fixed sleeve 241.

[0031] A compression spring 242 is fitted onto one end of the fixed sleeve 241 near the melting tube 234. A compression wedge 243 is provided on one side of the rotating plate 237. A compression push rod 244 is slidably connected to one end of the connecting rod 221. The end of the compression push rod 244 away from the compression wedge 243 is fixedly connected to the sliding column 232. The function of this component is that, by setting the auxiliary component 24, when the rotating plate 237 inside the tensioning component 23 is manually pushed to rotate counterclockwise upward along the rotating column 223, the compression wedge 243 on one side of the rotating plate 237 is rotated. When pushed into the groove inside the connecting rod 221, the squeezing inclined block 243 on one side of the rotating plate 237 squeezes the squeezing push rod 244. The squeezing push rod 244 is squeezed and drives the sliding column 232 to slide along the sliding groove 231. The sliding groove 231 drives the fuse tube 234 on the connecting sleeve 233 to slide. This arrangement makes the contact 31 at one end of the fuse tube 234 closer to the top part 32, thereby making the squeezing force between the contact 31 and the top part 32 greater when the fuse is closed, thus ensuring the stable conductivity of the fuse.

[0032] Example 2 differs from Example 1 in that: Figures 1-9 As shown, the connecting part 3 includes: Contact 31 is installed at the end of the fusible tube 234 away from the mounting part 2. Contact 31 is used to fix the fuse 235 inside the fusible tube 234. The top part 32 is installed directly above the upper connecting seat 13 and is used to cooperate with the contact part 31 for compression connection.

[0033] The contact element 31 includes an upper contact 311 threadedly connected to the end of the fusible tube 234 away from the mounting part 2, and a pull ring 312 fixedly connected to the side wall of the end of the fusible tube 234 near the upper contact 311.

[0034] The top part 32 includes an upper base 326 fixedly connected to the top of the upper connecting seat 13. A conductive rod 321 is fixedly connected to the upper base 326. An upper connector 322 is provided at the bottom of the conductive rod 321. A pressing contact 323 is provided at the top of the conductive rod 321. A pressure spring 324 is fixedly connected to the side of the pressing contact 323 near the upper base 326. A positioning groove 325 is provided on the side of the pressing contact 323 away from the pressure spring 324. The function of this part is to compress the upper contact 311 on the fuse tube 234 with the pressing contact 323 on the top part 32 by setting the connecting part 3. At this time, the pressure spring 324 contracts. When the upper contact 311 reaches the inside of the positioning groove 325 on the pressing contact 323, the pressure spring 324 rebounds, so that the pressing contact 323 and the upper contact 311 fit tightly together.

[0035] One specific application of this embodiment is: When using this fuse, it is installed vertically on the transformer, with the upper connecting seat 13 at the top and the lower connecting seat 12 at the bottom. By setting the mounting part 2, the rotating plate 237 inside the tensioning member 23 is manually pushed to rotate counterclockwise upwards along the rotating column 223 until the pressing block 243 on one side of the rotating plate 237 is pushed into the groove inside the connecting rod 221. At this time, one end of the fuse wire 235 inside the fuse tube 234 is fixed to the fixing plate 236 by the fastening bolt 238. The torsion spring 239 increases its potential energy due to the rotation of the rotating plate 237, and the fuse wire 235 is tightened under the influence of the torsion spring 239's potential energy, thus ensuring that the rotating plate 237 can rebound after the fuse wire 235 melts due to overcurrent. By setting the lower connecting part 21, when the fuse is closed, the rotation of the fuse tube 234 drives the rotating column 223 at the bottom of the connecting rod 221 to rotate. The inside of the groove 212 rotates, at which time the convex moving contact 222 on the rotating column 223 is pressed against the elastic stationary contact 215 on the bottom connecting piece 21. Since the convex moving contact 222 is a protrusion, as the rotation angle of the convex moving contact 222 increases, the degree of compression of the convex moving contact 222 against the elastic stationary contact 215 becomes greater. When the other end of the fuse tube 234 is closed, the compression force between the convex moving contact 222 and the elastic stationary contact 215 is the greatest. This arrangement helps to ensure that the connection of the fuse is more stable. By setting the connecting part 3, the upper contact 311 on the fuse tube 234 is pressed against the pressing contact 323 on the top part 32. At this time, the pressure spring 324 contracts. When the upper contact 311 reaches the positioning groove 325 on the pressing contact 323, the pressure spring 324 rebounds, so that the pressing contact 323 and the upper contact 311 are tightly fitted. By setting the auxiliary component 24, when the rotating plate 237 inside the tensioning component 23 is manually pushed to rotate counterclockwise upward along the rotating column 223 until the pressing wedge 243 on one side of the rotating plate 237 is pushed into the groove inside the connecting rod 221, the pressing wedge 243 on one side of the rotating plate 237 presses the pressing push rod 244. The pressing push rod 244 is pressed, which drives the sliding column 232 to slide along the sliding groove 231. The sliding groove 231 drives the fuse tube 234 on the connecting sleeve 233 to slide. This setting makes the contact 31 at one end of the fuse tube 234 closer to the top part 32, so that when the fuse is closed, the contact 31 and the top part 32 are more closely aligned. The greater squeezing force between the end pieces 32 ensures stable conductivity of the fuse. By providing the connecting part 3, when the fuse wire 235 in the fuse passes an overload current, the fuse wire 235 inside the fuse tube 234 melts. At this time, under the potential energy of the torsion spring 239, the rotating piece 237 resets clockwise, and the elastic potential energy of the compression spring 242 drives the fuse tube 234 on the connecting sleeve 233 to slide down along the sliding groove 231. At this time, the contact piece 31 at the upper end of the fuse tube 234 quickly disengages from the top piece 32, preventing the upper contact 311 on the contact piece 31 from getting stuck in the positioning groove 325, thus ensuring that the drop-out fuse trips quickly.

[0036] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A fuse device for transformer protection, comprising an insulator (1), wherein a mounting foot (11) is fixedly connected to the middle of the insulator (1), a lower connecting seat (12) is fixedly connected to the right end of the insulator (1), and an upper connecting seat (13) is fixedly connected to the left end of the insulator (1), characterized in that, Also includes: Mounting part (2), which is mounted on the top of the lower connecting seat (12), is used to provide a mounting base and also to assist in making the fuse connection tighter; and The connecting part (3) is installed directly above the end of the insulator (1) away from the mounting part (2). The connecting part (3) makes the circuit conductive by squeezing with one end of the mounting part (2). During the installation process, the mounting part (2) drives the connecting part (3) to move, making the connection of the connecting part (3) more precise.

2. The fuse device for transformer protection according to claim 1, characterized in that: The mounting part (2) includes: The lower connector (21) is installed on the top of the lower connector (12) and is used to connect wires; Rotate the clamping member (22), which is installed inside the lower end connector (21). The rotating clamping member (22) is slidably installed inside the lower end connector (21). By rotating the clamping member (22), the connection between the lower end connector (21) and the rotating clamping member (22) is squeezed. A tensioning member (23) is installed directly above the rotating clamping member (22) and is used to tension the internal components of the fuse. The auxiliary component (24) is installed directly above the rotating clamping component (22), and the tensioning component (23) rotates to drive the auxiliary component (24) to slide.

3. A fuse device for transformer protection according to claim 2, characterized in that: The lower connector (21) includes a connecting base (211) fixedly connected to the top of the lower connector (12). The top of the connecting base (211) is provided with several rotating grooves (212). A conductor plate (213) is fixedly connected to the connecting base (211). The bottom of the conductor plate (213) is provided with a lower connector (214). The lower connector (214) is used to connect wires. The top of the conductor plate (213) is provided with several elastic static contacts (215). The elastic static contacts (215) are elastic conductive metal sheets that are tilted upwards in the normal state.

4. A fuse device for transformer protection according to claim 3, characterized in that: The rotating clamping component (22) includes a connecting rod (221) located directly above the connecting base (211). The connecting rod (221) has a groove at one end near the lower connecting seat (12). A convex moving contact (222) is fixedly connected to the end of the connecting rod (221) near the connecting base (211). A rotating column (223) rotatably passes through the convex moving contact (222). The rotating column (223) is rotatably connected inside the rotating groove (212) at the top of the connecting base (211).

5. A fuse device for transformer protection according to claim 4, characterized in that: The tensioning member (23) includes a sliding groove (231) formed on the side wall of the connecting rod (221), a sliding column (232) is slidably connected inside the sliding groove (231), a connecting sleeve (233) is fixedly connected to the sliding column (232), a fusible tube (234) is fixedly connected to the connecting sleeve (233), and a fuse wire (235) is provided inside the fusible tube (234). The bottom of the connecting rod (221) is fixedly connected to a fixing plate (236), and the bottom of the fixing plate (236) is threadedly connected to a fastening bolt (238). The fastening bolt (238) is used to fix one end of the fuse (235). The middle part of the rotating column (223) is rotatably fixedly connected to a rotating plate (237). The middle part of the rotating column (223) is fitted with a torsion spring (239). One end of the torsion spring (239) is engaged with one side of the rotating plate (237), and the other end of the torsion spring (239) is engaged with the surface of the convex moving contact (222).

6. A fuse device for transformer protection according to claim 5, characterized in that: The auxiliary component (24) includes a fixed sleeve (241) fixedly connected to the end of the connecting rod (221) away from the convex moving contact (222), and the fusion tube (234) is slidably connected inside the fixed sleeve (241).

7. A fuse device for transformer protection according to claim 6, characterized in that: A compression spring (242) is fitted on one end of the fixed sleeve (241) near the melting tube (234). A compression slant block (243) is provided on one side of the rotating plate (237). A compression push rod (244) is slidably connected to one end of the connecting rod (221). The end of the compression push rod (244) away from the compression slant block (243) is fixedly connected to the sliding column (232).

8. A fuse device for transformer protection according to claim 7, characterized in that: The connecting part (3) includes: Contact (31) is installed at one end of the fusible tube (234) away from the mounting part (2), and the contact (31) is used to fix the fuse (235) inside the fusible tube (234). Top part (32), which is installed directly above the upper connecting seat (13), is used to cooperate with the contact part (31) for compression connection.

9. A fuse device for transformer protection according to claim 8, characterized in that: The contact member (31) includes an upper contact (311) threadedly connected to the end of the fusible tube (234) away from the mounting part (2), and a pull ring (312) is fixedly connected to the side wall of the fusible tube (234) near the upper contact (311).

10. A fuse device for transformer protection according to claim 9, characterized in that: The top part (32) includes an upper base (326) fixedly connected to the top of the upper connecting seat (13). A conductive rod (321) is fixedly connected to the upper base (326). An upper connector (322) is provided at the bottom of the conductive rod (321). A pressing contact (323) is provided at the top of the conductive rod (321). A pressure spring (324) is fixedly connected to the side of the pressing contact (323) near the upper base (326). A positioning groove (325) is provided on the side of the pressing contact (323) away from the pressure spring (324).

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