Self-locking high-voltage fuse

Abstract

This invention discloses a self-locking high-voltage fuse, comprising an insulated outer cylinder and an inner cylinder for housing a fuse tube or fuse wire, and a self-locking mechanism. The self-locking mechanism includes a latching assembly and a socket-type lock cylinder. The latching assembly is installed at the lower end of the outer cylinder, and the socket-type lock cylinder is connected to the lower end of the inner cylinder. The socket-type lock cylinder and the inner cylinder form an assembly that can be inserted into or removed from the outer cylinder and the latching assembly. This assembly, in conjunction with the latching assembly, forms the self-locking mechanism and locks or unlocks the inner cylinder within the outer cylinder. This invention employs an internally and externally enclosed structure and an automatic locking function, completely avoiding the influence of natural environment and external factors on the electrical and mechanical performance of the high-voltage fuse. It has unique advantages such as convenient and quick fuse replacement, simple operation, and overall reliability and durability.

Description

Technical Field

[0001] This invention relates to a high-voltage fuse. Technical Background

[0002] Replacing high-voltage fuses on outdoor voltage transformers in substations within power systems is extremely inconvenient, requiring specialized personnel to perform switching operations before maintenance staff can replace the fuses. This results in significant resource waste and fails to meet the demands of efficient operation and maintenance of power equipment. In widespread distribution systems, high-voltage drop-out fuses are extensively used; however, a prominent problem exists: the reliability of distribution high-voltage fuses is very low, including short electrical and mechanical lifespans and frequent failures. Therefore, how to make high-voltage fuses simultaneously convenient to replace, highly reliable, and long-lasting is a pressing issue that needs to be addressed. Summary of the Invention

[0003] The purpose of this invention is to provide a highly reliable, self-locking high-voltage fuse that allows for convenient and quick replacement of the fuse tube or fuse wire.

[0004] The present invention provides a self-locking high-voltage fuse, comprising an insulated outer reservoir and an inner reservoir for housing a fuse tube or fuse wire, and further comprising a self-locking mechanism, which includes a latching assembly and a socket-type lock cylinder. The latching assembly is installed at the lower end of the outer reservoir, and the socket-type lock cylinder is connected to the lower end of the inner reservoir. The socket-type lock cylinder and the inner reservoir form an assembly that can be inserted into or removed from the outer reservoir and the latching assembly, for the socket-type lock cylinder and the latching assembly to cooperate to form the self-locking mechanism, and for locking or unlocking the inner reservoir within the outer reservoir.

[0005] To ensure reliable operation of the self-locking mechanism, the latch assembly includes a latch body, a movable and automatically resetting push ring inside the latch body, and a movable and automatically resetting unlocking disc outside the latch body. The lower end of the latch body has a ball bearing for locking. The push ring and unlocking disc act on the ball bearing, causing it to enter or exit the socket-type lock cylinder. The socket-type lock cylinder includes a lower socket with a conical surface and a concave groove. The conical surface pushes the push ring, allowing the ball bearing to enter the concave groove and lock the assembly.

[0006] To ensure ease of operation, the socket-type lock cylinder has an operating end near the concave slot, which has a structure for installing or removing the assembly with an operating lever. The operating end of the socket-type lock cylinder has a through hole for inserting the operating lever, and guide grooves are provided on both sides of the through hole for the operating lever to use. There is a through groove in the middle of the two guide grooves to facilitate the installation of a fuse.

[0007] To ensure stable operation of the push-back ring and unlocking disc, the push-back ring is reset by a push-back spring, which is installed inside the locking body. The unlocking disc is reset by an unlocking spring, which is installed inside the unlocking disc but outside the locking body. The locking body has a limit switch at the top and a blocking ring and a retaining ring at the bottom for upper and lower limit positioning of the unlocking disc. Under external force, the unlocking disc moves within its stroke range and compresses the unlocking spring, causing the ball bearings to exit the concave groove and unlocking the assembly.

[0008] If the fuse needs to be replaced, secure it by passing the fuse through the opening at the top of the upper plug and the insulating cylinder, as well as the small hole in the lower socket of the socket-type lock cylinder.

[0009] This invention places the inner storage cylinder containing the fuse tube or fuse wire inside the outer storage cylinder, and is locked with a self-locking mechanism. Replacing the fuse tube or fuse wire involves removing the entire assembly with the operating rod, replacing the fuse tube or fuse wire, and then inserting the assembly back into the outer storage cylinder. Furthermore, during unlocking, the upper plug and lower socket of the assembly are held in place by contact springs, preventing them from falling out automatically; the assembly can only be removed with the action of the operating rod. Every step in the entire process is highly reliable and safe, and locking and unlocking are very convenient. Locking simply requires pushing the operating end of the socket-type lock cylinder with the operating rod, and unlocking simply requires pushing the unlocking disc with the operating rod. This invention effectively combines the outstanding advantages of two existing high-voltage fuses in use, and introduces a self-locking operating mechanism, giving it unique advantages such as convenient and quick fuse replacement, simple operation, reliability, and durability. Moreover, the overall enclosed structure comprehensively reduces the impact of the external environment on the high-voltage fuse. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the present invention.

[0011] Figure 2 yes Figure 1 The explosion diagram.

[0012] Figure 3 This is a cross-sectional view of a socket-type lock cylinder.

[0013] Figure 4 This is a cross-sectional view of the latch assembly.

[0014] Figure 5 yes Figure 1 A sectional view.

[0015] Figure 6 yes Figure 5 Enlarged view of part B.

[0016] The attached figures are labeled as follows:

[0017] 1. Outer storage cylinder, 11. Fixing plate, 12. Storage cylinder, 13. Insulating sleeve, 14. Upper connecting seat

[0018] Top cover 15, lower connecting seat 16, conductive contact spring 17;

[0019] Inner storage cylinder 2, insulating cylinder 21, upper plug 22, opening 23;

[0020] Socket-type lock cylinder 3, lower socket 31, conical surface 32, concave groove 33, through groove 34.

[0021] Guide groove 35; through hole 36; small hole 37;

[0022] Locking assembly 4, push-back ring 41, push-back spring 42, locking ring 43, locking body 44, limit 45, ball bearing 46, unlocking disc 47, unlocking spring 48, blocking ring 49, snap ring 50; self-locking mechanism I, assembly II. Detailed Implementation

[0023] from Figure 1 and Figure 2 As can be seen, the present invention has an outer storage cylinder 1, an inner storage cylinder 2, and a self-locking mechanism I. The locking assembly 4 is installed at the lower end of the outer storage cylinder 1, and the socket-type lock cylinder 3 is screwed at the lower end of the inner storage cylinder 2 to form an assembly II. The assembly II can be inserted into the locking assembly 4 and the outer storage cylinder 1. The socket-type lock cylinder 3 and the locking assembly 4 cooperate to form the self-locking mechanism I, so that the inner storage cylinder 2 is reliably locked in the outer storage cylinder 1. When the self-locking mechanism I is unlocked, the assembly II can be removed from the outer storage cylinder 1 and the locking assembly 4 for replacement of the fuse tube.

[0024] from Figure 2 and Figure 5 It can be seen that:

[0025] The outer storage cylinder 1 includes a fixing plate 11, a storage cylinder 12, an insulating sleeve 13, an upper connecting seat 14, a top cover 15, and a lower connecting seat 16. The top cover 15 and the upper connecting seat 14 constitute the upper part of the outer storage cylinder. The top cover 15 is used to close the upper connecting seat 14. Figure 5 It can be seen that the storage cylinder 12 is inside the insulating sleeve 13. The upper connecting seat 14 is installed at the upper end of the storage cylinder 12 to conduct current. The fixing plate 11 is installed in the middle of the storage cylinder 12 to fix the entire fuse to the power support. The lower connecting seat 16 is installed at the lower end of the storage cylinder 12 to conduct current.

[0026] The inner storage cylinder 2 includes an insulating cylinder 21 and an upper plug 22. The inner storage cylinder 2 is used to hold a fuse tube or fuse wire. The upper plug 22 is fixed to the upper end of the insulating cylinder 21 and is connected to... Figure 5 It can be seen that the top of the plug 22 has an opening 23, which can be used to install a fuse.

[0027] Figures 3-6The diagram clearly shows the detailed structure of the self-locking mechanism. As can be seen from the diagram, the socket-type lock cylinder 3 and the latch assembly 4 will form a self-locking mechanism I.

[0028] Figure 3 This describes the structure of the socket-type lock cylinder 3, which includes a lower socket 31, a conical surface 32, a concave groove 33, a through groove 34, a guide groove 35, and a through hole 36. The conical surface 32 and the concave groove 33 are located at the lower part of the lower socket 31 and are used to cooperate with the latch assembly 4 to complete the self-locking function. The guide groove 35 and the through hole 36 are both located at the lower end of the lower socket 31 and are used for operating the lever to operate the socket-type lock cylinder 3. The small hole 37 is located on the lower end face of the lower socket 31. It, along with the opening 23 at the top of the upper plug, is used to install and fix the fuse. The through groove 34 is used to facilitate the installation and fixation of the fuse.

[0029] from Figure 2 and Figure 4 As can be seen, the locking assembly 4 has a threaded locking body 44, through which the locking assembly 4 is connected to the lower connecting seat 16, and in combination Figure 4 It can be seen that the latch assembly 4 has a push-back ring 41, a push-back spring 42, a locking ring 43, a ball bearing 46, an unlocking disc 47, an unlocking spring 48, a blocking ring 49, and a retaining ring 50. The push-back ring 41 and the push-back spring 42 are both installed in the latch body 44, with the locking ring 43 pressing the push-back spring 42 into the latch body 44. The unlocking disc 47 contains the unlocking spring 48. The unlocking disc 47 and the unlocking spring 48 are fitted around the latch body 44 and are blocked and limited by the blocking ring 49 and the retaining ring 50. The upper end of the unlocking disc 47 is limited by a limit 45 on the latch body 44.

[0030] Combination Figure 5 and Figure 6 As can be seen, the lower socket 31 of the socket-type lock cylinder 3 can be inserted into the latch body 44 and act on the push-back ring 41 through its conical surface, causing the push-back ring 41 to move upward, compressing the push-back spring 42. The push-back ring 41 releases the inward constraint on the ball 46. At the same time, the ball is pushed inward by the unlocking spring 48 and the unlocking disc 47, causing the ball to move inward into the concave groove 33 of the socket-type lock cylinder 3. At this time, the unlocking disc 47 is at the lower limit position, locking the ball 46 in the concave groove 33, and the automatic mechanism I is securely locked. When the unlocking disc 47 is pushed upward to the limit 45, the unlocking spring 48 is compressed, the unlocking disc 47 releases the outward constraint on the ball 46, and at the same time, the push-back ring 41 moves rapidly downward under the action of the push-back spring 42, isolating the ball 46 from the concave groove 33. The ball 46 moves outward away from the concave groove 33, and the self-locking mechanism I is unlocked.

[0031] from Figure 6It can be further seen that there are conductive contact springs 17 in the upper connecting seat 14 and the lower connecting seat 16. These contact springs are used to conduct electricity first, and secondly to clamp the upper plug and lower socket of the assembly II to prevent the assembly from falling down automatically after unlocking.

[0032] During installation, first assemble all components of the outer storage cylinder 1, then install the latch assembly 4 on the lower connecting seat 16, and then assemble the inner storage cylinder 2. At the same time, screw the inner storage cylinder 2 onto the lower socket 31 of the socket-type lock cylinder 3 to form an assembly II. Insert the assembly into the latch body 44 until it is inside the outer storage cylinder 1, so that the contact finger spring 17 is first used to conduct electricity, and then used to tighten the upper plug and lower socket of the assembly to prevent the assembly from falling down automatically after unlocking.

[0033] During operation, the maintenance personnel use the vertical metal head of the insulating rod to push the unlocking disc 47 upward to unlock the socket-type lock cylinder. Then, the horizontal metal head of the insulating rod is passed through the through hole 36 of the socket-type lock cylinder 3, and the vertical metal head is embedded in the guide groove 35. The insulating rod can reliably fix the height and vertical direction of the assembly, thereby safely and reliably removing the entire assembly II.

[0034] After removing assembly II, replace the internal fuse. For tubular fuses, simply unscrew the upper plug 22 of the assembly, remove the internal fuse tube, replace it with a new fuse tube, and then screw the upper plug 22 back on. For linear fuses, first unscrew the inner reservoir 2, then pass the fuse through the opening 23 of the inner reservoir 2, through the upper plug 22 and the insulating tube 21, and then through the small hole 37 at the lower end of the lower socket 31 of the socket-type lock cylinder 3. Next, screw the inner reservoir 2 onto the lower socket 31 of the socket-type lock cylinder 3. Add a small copper plate to the small hole 37 at the lower end of the lower socket 31, tighten the fuse and wrap it around the small copper plate to fix it. The linear fuse replacement is now complete. After replacing the fuse in Assembly II, the installation operation is still performed using a standard insulating rod. First, insert the horizontal metal head of the insulating rod into the through hole 36 of the socket-type lock cylinder 3, and embed the vertical metal head into the guide groove 35, so that the metal head of the insulating rod can fix and support the entire Assembly II well. Then, lift the insulating rod and align the upper plug 22 of Assembly II with the lower port of the latch assembly 4. Slowly insert the conical head of the upper plug 22 into the lower port of the latch assembly 4. After confirming the insertion, push Assembly II in slowly at first and then quickly. In the final stage, the conical surface 32 on the lower socket 31 of the assembly will act on a mating surface inside the push-back ring 41, causing the push-back ring 41 to move upward and compress the push-back spring to store energy for the next unlocking. When the push-back ring 41 moves upward, the internal locking force of the ball disappears, causing the lower locking ball to accelerate from the outside to the inside under external force, and finally lock into the concave groove 33 on the lower socket 31, realizing the automatic locking of Assembly II. Because the unlocking spring's force is always present, the lower boss of the unlocking disc 47 locks the ball bearing in the concave groove 33, keeping the entire self-locking mechanism I in a stable locked state. High-voltage power is introduced from the upper connector 14, flows through the internal conductive contact spring 17 into the upper plug 22, through the fuse to the lower socket 31, and then through the internal conductive contact spring 17 to the lower connector 16 to conduct the entire high-voltage circuit back, achieving circuit connection and protection functions.

Claims

1. A self-locking high-voltage fuse, comprising an insulating outer cylinder (1) and an inner cylinder (2) for housing a fuse tube or fuse wire, the outer cylinder (1) comprising a fixing plate (11), a storage cylinder (12), an insulating sleeve (13), an upper connecting seat (14), a top cover (15), and a lower connecting seat (16); the inner cylinder (2) comprising an insulating cylinder (21) and an upper plug (22), the inner cylinder (2) being used to hold the fuse tube or fuse wire, the upper plug (22) being fixed to the upper end of the insulating cylinder (21); characterized in that: It also includes a self-locking mechanism, which includes a latch assembly (4) and a socket-type lock cylinder (3). The latch assembly (4) is installed at the lower end of the outer storage cylinder (1), and the socket-type lock cylinder (3) is connected to the lower end of the inner storage cylinder (2). The socket-type lock cylinder (3) and the inner storage cylinder (2) form an assembly (II). The assembly (II) can be inserted into or removed from the outer storage cylinder (1) and the latch assembly (4) for the socket-type lock cylinder (3) and the latch assembly (4) to cooperate to form the self-locking mechanism (I) and for locking or unlocking the inner storage cylinder (2) in the outer storage cylinder (1). There are conductive contact springs (17) in the upper connecting seat (14) and the lower connecting seat (16). The latch assembly (4) includes a latch body (44), a push-back ring (41) inside the latch body that can move under external force and automatically reset, and an unlocking disc (47) outside the latch body that can move under external force and automatically reset. The latch body has a ball (46), and the push-back ring 41 and the unlocking disc 47 act on the ball to allow the ball to enter or exit the socket-type lock cylinder (3).

2. The self-locking high-voltage fuse according to claim 1, characterized in that... The socket-type lock cylinder (3) includes a lower socket (31) with a conical surface (32) and a concave groove (33). The conical surface (32) pushes the push-back ring (41) so that the ball (46) can enter the concave groove (33) to lock the assembly (II).

3. The self-locking high-voltage fuse according to claim 2, characterized in that... The socket-type lock cylinder (3) has an operating end near the concave slot (33), which has a structural guide groove 35 and a through hole 36 for facilitating the installation or removal of the operating rod from the assembly.

4. The self-locking high-voltage fuse according to claim 1, characterized in that... The push-back ring (41) is reset by the push-back spring, which is installed inside the locking body (44).

5. The self-locking high-voltage fuse according to claim 1, characterized in that... The unlocking disc is reset by the unlocking spring (48), which is installed inside the unlocking disc.

6. The self-locking high-voltage fuse according to claim 1, characterized in that... The upper part of the latch body (44) has a limit (45) and the lower end has a blocking ring (49) and a snap ring (50) for the upper and lower limits of the unlocking disc.

7. The self-locking high-voltage fuse according to claim 2, characterized in that... The unlocking disc (47) moves within its stroke range under the action of external force and compresses the unlocking spring (48), causing the ball to exit the concave groove (33) and unlocking the assembly (II).

8. The self-locking high-voltage fuse according to claim 1, characterized in that... The socket-type lock cylinder (3) has a small hole (37) on the end face near the operating end, and the upper plug (22) has a corresponding opening (23) for passing through and fixing the fuse.

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