Isolator knife with alarm switch

Abstract

This application relates to an isolating fuse with an alarm switch, belonging to the technical field of fuses. It includes a fuse tube and an indicator mounted on the fuse tube. The indicator has a trigger element that can be actuated by the fuse. It also includes an alarm, which is connected to the indicator via a snap-fit ​​structure. The alarm has an on / off switch positioned directly opposite the movement trajectory of the trigger element and is triggered when the trigger element moves. This application improves the automation level of fault detection by integrating an alarm into the isolating fuse, avoiding reliance on manual inspection. The snap-fit ​​structure simplifies the installation and removal of the alarm, reducing maintenance costs. The on / off switch positioned directly opposite the movement trajectory of the trigger element ensures reliable alarm signal triggering when the fuse blows, thereby significantly reducing system downtime, preventing potential cascading damage to equipment, and enhancing overall safety and ease of operation.

Description

Technical Field

[0001] This application relates to the field of fuses, and more particularly to an isolating knife fuse with an alarm switch. Background Technology

[0002] The isolating knife fuse is a core protection component in a disconnecting switch system, specifically designed to provide fast short-circuit protection in power equipment. As a type of fast-acting fuse, it is mainly used in semiconductor rectifier circuits, capable of melting in a very short time to limit overload current and prevent equipment damage.

[0003] Existing fast-acting fuses typically include key components such as a fuse tube, current terminals, and a cover plate. The fuse tube is a ceramic tube open at both ends, filled with an arc-quenching material (such as silica sand), with the fusible element placed inside. The two ends are connected to an external circuit via current terminals. For status indication, existing designs provide a fuse-blown signal via an indicator: the indicator is mounted on the fuse tube, with a through-hole and a mounting slot. A plug is placed in the through-hole, and a spring is placed in the mounting slot. The plug is connected to the fusible element via a fuse wire. When a fuse blows, the fuse wire melts, and the plug springs back up under the spring's action, exposing the through-hole and providing a visual indication.

[0004] However, this purely mechanical visual indication has significant drawbacks: operators must check the status of the plug on-site to detect a blown fuse. In unattended or complex industrial environments, this can easily lead to response delays, failure to detect faults in a timely manner, and consequently, extended downtime or triggering a chain reaction of accidents. Utility Model Content

[0005] In order to improve the problem of delayed fault response caused by the reliance on manual inspection of existing fast-acting fuses and enhance the active safety protection capability of the disconnecting switch system, this application provides a disconnecting knife fuse with an alarm switch.

[0006] This application provides an isolation knife fuse with an alarm switch, which adopts the following technical solution:

[0007] An isolating knife fuse with an alarm switch includes a fuse tube and an indicator disposed on the fuse tube. The indicator is provided with a trigger element that can be driven by the fuse. The fuse also includes an alarm, which is connected to the indicator via a snap-fit ​​structure. The alarm is provided with a switch that is positioned directly opposite the movement trajectory of the trigger element and is triggered when the trigger element moves.

[0008] Optionally, the fusible tube contains a molten material, the indicator has a through hole, the fusible tube has a mounting groove and a through hole communicating with the mounting groove, and the trigger includes a plug, a first spring and a connecting fuse. The plug is movably disposed in the through hole, one end of the first spring is connected to the bottom wall of the mounting groove and the other end is connected to the plug; one end of the connecting fuse is connected to the molten material and the other end is connected to the plug.

[0009] Optionally, the latching structure includes at least two latching strips fixed to the alarm, and the indicator is provided with latching slots that are adapted to the latching strips.

[0010] Optionally, the two ends of the molten tube are provided with cover plates, and the two ends of the molten body are provided with terminals, with each terminal passing through the corresponding cover plate.

[0011] Optionally, the terminal includes a fixing part and an interface part, the fixing part being fixed to the corresponding cover plate, and the interface part being threadedly connected to the end of the fixing part away from the melt.

[0012] Optionally, a locking bolt is threaded through the side wall of the interface portion.

[0013] Optionally, a second spring is fitted onto the locking bolt, with one end of the second spring abutting against the side wall of the interface portion and the other end abutting against the head of the locking bolt.

[0014] Optionally, each of the cover plates has an integrally bent mounting portion on the side away from the fusion tube, and the mounting portion is provided with mounting holes.

[0015] Optionally, the mounting hole is a strip-shaped hole.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. By integrating an alarm into the fuse holder, the automation level of fault detection is improved, avoiding reliance on manual inspections. The snap-fit ​​structure simplifies the installation and removal of the alarm, reducing maintenance costs. The on / off switch is aligned with the movement trajectory of the trigger element, ensuring reliable alarm signal triggering upon fuse failure and timely audible / visual alarm issuance. This significantly reduces system downtime, prevents potential cascading damage to equipment, and enhances overall safety and ease of operation. The detachable design of the alarm also allows for flexible upgrades or replacements, improving product adaptability and lifespan.

[0018] 2. By setting up the fixing part and the interface part, the terminal achieves a split design, which improves the versatility and maintainability of the fuse; the fixing part passes through the cover plate to provide basic support, while the interface part is detachable and replaceable, allowing for the selection of different diameter interface parts according to different wire diameter specifications; the threaded connection of the interface part and the fixing part simplifies the assembly and disassembly of the terminal and reduces tool dependence. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an isolation knife fuse with an alarm switch according to an embodiment of this application.

[0020] Figure 2This is a cross-sectional view showing the internal structure of the fusion tube in the embodiments of this application.

[0021] Figure 3 This is an exploded view illustrating the terminal structure composition in the embodiments of this application.

[0022] Figure 4 This is an exploded view illustrating the snap-fit ​​structure in the embodiments of this application.

[0023] Figure 5 This is an exploded view showing the positional relationship between the on / off switch and the trigger element in the embodiments of this application.

[0024] Figure 6 yes Figure 2 A magnified view of a portion of point A in the middle.

[0025] Explanation of reference numerals in the attached drawings: 1. Fuse tube; 11. Mounting groove; 12. Perforation; 2. Fuse; 3. Cover plate; 31. Mounting part; 311. Mounting hole; 4. Terminal; 41. Fixing part; 42. Interface part; 421. Locking bolt; 422. Second spring; 5. Indicator; 51. Through hole; 52. Snap-fit ​​slot; 6. Trigger; 61. Hole plug; 62. First spring; 63. Connecting fuse; 7. Alarm; 71. On / off switch; 8. Snap-fit ​​structure; 81. Snap-fit ​​strip. Detailed Implementation

[0026] The following combination Figures 1-6 This application will be described in further detail below.

[0027] Example:

[0028] This application discloses an isolation knife fuse with an alarm switch. (Refer to...) Figure 1 and Figure 2 An isolating knife fuse with an alarm switch includes a fuse tube 1 and a fuse body 2 disposed inside the fuse tube 1. To ensure the protective capability of the fuse tube 1, cover plates 3 are fixedly connected to both ends of the fuse tube 1, and terminals 4 are fixedly connected to both ends of the fuse body 2. Each terminal 4 passes through the corresponding cover plate 3.

[0029] Reference Figure 2 and Figure 3 Terminal 4 includes a fixing part 41 and an interface part 42. The fixing part 41 is fixed to the corresponding cover plate 3, and the interface part 42 is threaded to the end of the fixing part 41 away from the fusible element 2. Thus, the fixing part 41, fixed to the cover plate 3, provides basic mounting support for the fusible element 2 inside the fuse tube 1; while the interface part 42 is detachable and replaceable, allowing for the selection of different diameter interface parts 42 according to different wire diameter specifications, thereby improving the versatility and maintainability of the fuse. Furthermore, the threaded connection between the interface part 42 and the fixing part 41 simplifies the assembly and disassembly of terminal 4, reducing tool dependence.

[0030] Reference Figure 2 and Figure 3 A locking bolt 421 is threaded onto the side wall of the interface portion 42, with the tail of the locking bolt 421 passing through the side wall of the interface portion 42 from the outside in. In this embodiment, two locking bolts 421 are provided on each interface portion 42. The locking bolts 421 provide variable clamping force through thread adjustment to accommodate different wire sizes; at the same time, this design simplifies the operation process during wiring, allowing users to easily tighten the locking bolts 421 to clamp the wire end, enhancing the reliability of wire fixation and preventing overheating or arcing caused by poor contact.

[0031] Reference Figure 2 and Figure 3 A second spring 422 is fitted onto the locking bolt 421. The second spring 422 is a helical compression spring, with one end abutting against the side wall of the interface portion 42 and the other end abutting against the head of the locking bolt 421. The continuous elastic force of the second spring 422 compensates for the potential loosening of the threaded connection, ensuring that the locking bolt 421 remains tight under thermal cycling or mechanical stress, and maintains a stable connection in a vibration environment, reducing the risk of loosening and improving the electrical stability of long-term use. In addition, this structure requires no additional maintenance, reduces the failure rate, and simplifies the overall wiring operation.

[0032] Reference Figure 1 To facilitate the rapid installation of the isolating knife fuse into the disconnecting switch system, each cover plate 3 has an integrally bent mounting part 31 on the side away from the fuse tube 1, and the mounting part 31 is provided with mounting holes 311. The mounting holes 311 adopt a strip hole design to provide flexibility in position adjustment and to adapt to mounting brackets or mounting surfaces of different sizes.

[0033] Reference Figure 1 , Figure 4 and Figure 5 An indicator 5 is fixed to the side wall of the fusible tube 1. The indicator 5 is equipped with a trigger element 6 that can be driven by the melting of the fusible element 2, providing visual indication. To enhance the safety of the disconnecting switch system, the disconnecting knife fuse also includes an alarm 7, which can be an audible / visual alarm device. The alarm 7 is connected to the indicator 5 via a snap-fit ​​structure 8. The alarm 7 is equipped with a switch 71 for triggering the alarm. The switch 71 is positioned directly opposite the movement trajectory of the trigger element 6 and is triggered when the trigger element 6 moves.

[0034] Reference Figure 2 and Figure 6The indicator 5 has a through hole 51 on its top wall, and the fuse tube 1 has a mounting groove 11 and a through hole 12 communicating with the mounting groove 11 on its top wall. The trigger 6 includes a plug 61, a first spring 62, and a connecting fuse 63. The plug 61 is movably disposed in the through hole 51; one end of the first spring 62 is connected to the bottom wall of the mounting groove 11, and the other end of the first spring 62 is connected to the bottom wall of the plug 61; one end of the connecting fuse 63 is connected to the molten body 2, and the other end passes through the through hole 12 and is connected to the bottom wall of the plug 61. In this embodiment, the first spring 62 is a helical compression spring. When the molten metal 2 is in normal working condition, the plug 61 can be tightened by the connecting fuse 63, and the first spring 62 is compressed. When the molten metal 2 melts, the connecting end of the connecting fuse 63 on the molten metal 2 melts simultaneously, the first spring 62 resets, and the plug 61 is lifted out of the through hole 51 and touches the switch 71 of the alarm 7, thereby triggering the alarm 7 to sound an alarm.

[0035] Reference Figure 4 and Figure 5 The latching structure 8 includes at least two latching strips 81 fixed to the bottom of the alarm 7. The length direction of the latching strips 81 is parallel to the movement direction of the plug 61. The indicator 5 has latching slots 52 that are adapted to the latching strips 81. When installing the alarm 7, simply align the latching strips 81 with the latching slots 52 and press them into place to achieve quick assembly of the alarm 7.

[0036] The implementation principle of the isolating knife fuse with alarm switch in this application embodiment is as follows: By integrating the alarm 7 into the isolating knife fuse, the automation level of fault detection is improved, avoiding reliance on manual inspection; the design of the snap-fit ​​structure 8 simplifies the installation and disassembly process of the alarm 7, reducing maintenance costs; the on / off switch 71 is positioned directly opposite the movement trajectory of the trigger element 6 to ensure reliable triggering of the alarm signal when the fuse blows, promptly issuing an audible / visual alarm, thereby significantly reducing system downtime, preventing potential cascading damage to equipment, and enhancing overall safety and ease of operation. The detachable design of the alarm 7 also allows for flexible upgrades or replacements, improving the product's adaptability and service life.

[0037] In addition, the terminal 4 of the isolation knife fuse adopts a split design. The fixing part 41 passes through the cover plate 3 to provide basic support, while the interface part 42 is detachable and replaceable, allowing different diameter interface parts 42 to be selected according to different wire diameter specifications, thereby improving the versatility and maintainability of the fuse.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An isolating knife fuse with an alarm switch, comprising a fuse tube (1) and an indicator (5) disposed on the fuse tube (1), wherein the indicator (5) is provided with a trigger element (6) that can be driven by the fuse, characterized in that: It also includes an alarm (7), which is connected to the indicator (5) via a snap-fit ​​structure (8). The alarm (7) is provided with a switch (71), which is set to face the movement trajectory of the trigger (6) and is triggered when the trigger (6) moves.

2. The isolating knife fuse with alarm switch according to claim 1, characterized in that: The molten tube (1) contains a molten material (2), the indicator (5) has a through hole (51), the molten tube (1) has a mounting groove (11) and a through hole (12) communicating with the mounting groove (11), the trigger (6) includes a plug (61), a first spring (62) and a connecting fuse (63), the plug (61) is movably disposed in the through hole (51), one end of the first spring (62) is connected to the bottom wall of the mounting groove (11) and the other end is connected to the plug (61); one end of the connecting fuse (63) is connected to the molten material (2) and the other end is connected to the plug (61).

3. The isolating knife fuse with alarm switch according to claim 1, characterized in that: The buckle structure (8) includes at least two buckle strips (81) fixed to the alarm (7), and the indicator (5) is provided with buckle slots (52) that are adapted to the buckle strips (81).

4. The isolating knife fuse with alarm switch according to claim 2, characterized in that: The two ends of the molten tube (1) are provided with cover plates (3), and the two ends of the molten body (2) are provided with terminals (4), and each terminal (4) passes through the corresponding cover plate (3).

5. The isolating knife fuse with alarm switch according to claim 4, characterized in that: The terminal (4) includes a fixing part (41) and an interface part (42). The fixing part (41) is fixed to the corresponding cover plate (3), and the interface part (42) is threaded to the end of the fixing part (41) away from the melt (2).

6. The isolating knife fuse with alarm switch according to claim 5, characterized in that: A locking bolt (421) is threaded through the side wall of the interface part (42).

7. The isolating knife fuse with alarm switch according to claim 6, characterized in that: A second spring (422) is fitted on the locking bolt (421). One end of the second spring (422) abuts against the side wall of the interface part (42), and the other end abuts against the head of the locking bolt (421).

8. The isolating knife fuse with alarm switch according to claim 4, characterized in that: Each of the cover plates (3) has an integrally bent mounting part (31) on the side away from the melting tube (1), and the mounting part (31) is provided with mounting holes (311).

9. The isolating knife fuse with alarm switch according to claim 8, characterized in that: The mounting hole (311) is a strip-shaped hole.

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