A fuse including a fuse indication device

Abstract

This utility model discloses a fuse including a fuse failure indicator. The fuse is mounted on a fuse holder, which has a protective shell. The protective shell and the fuse form a relatively sealed space for guiding fusible gas. The relatively sealed space has a pressure relief channel communicating with the indicator. The protective shell has an installation / removal opening, and a movable plate at the opening that closes the opening under the action of a spring. The movable plate has a limiting structure to reduce unintended release of fusible gas from the opening side. The indicator is located on the gas outlet side of the pressure relief channel and includes a housing, a vent plate, a diaphragm, and a pressure plate. The fusible gas acts on the diaphragm through the pressure relief channel, pushing the pressure plate to the trigger position. Under the action of the locking structure, the pressure plate triggers the triggering assembly to trigger the alarm to issue a fuse failure indicator. The housing has a pressure relief port for pressure relief. This structure is compact, has reliable triggering, and is suitable for invisible environments such as inside cabinets or boxes.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, and in particular to a fuse including a fuse indication device. Background Technology

[0002] Fuses, as overcurrent and short-circuit protection components in circuits, are widely used in distribution switchgear, ring main units, prefabricated substations, and complete low-voltage systems. However, existing fuses often fail to promptly and clearly send continuous alarm signals to maintenance personnel after blowing. Especially in non-visual environments such as inside cabinets or boxes, maintenance personnel cannot immediately ascertain the fuse's operational status, thus affecting the efficiency of troubleshooting and maintenance.

[0003] Currently, existing technologies typically utilize the temperature rise or internal pressure change during fuse failure to actuate a piston, bimetallic strip, or trigger to issue a warning. However, such solutions often lack modifications to the sealed cavity or end space inside the fuse, making the gas driving force acting on the warning mechanism unstable, which in turn affects the reliability and consistency of warning triggering.

[0004] Therefore, there is an urgent need for a solution that is simple in structure, easy to install, reliable in the long term, and does not affect the normal pressure relief of the fuse, so as to effectively solve the problem that the fuse cannot issue a warning signal in a timely and continuous manner after it blows. Utility Model Content

[0005] This utility model discloses a fuse with a fuse-breaking indicator device, which aims to solve the problem that existing fuses are unable to send a continuous and clear alarm signal to maintenance personnel in a timely manner after blowing, especially in non-visual scenarios such as inside cabinets and boxes, where maintenance personnel cannot know the working status of the fuse in the first place, thus affecting the efficiency of fault diagnosis and maintenance.

[0006] The technical solution of this utility model is as follows: A fuse including a fuse indication device includes a fuse holder and a fuse mounted on the fuse holder. The fuse holder has a protective shell, and the protective shell and the fuse form a relatively sealed space for guiding fusible gas. The relatively sealed space has a pressure relief channel communicating with the indication device. The protective shell has an opening for installing and removing the fuse, and a movable plate is provided at the opening. The movable plate is in a closed position under the action of a first spring, and the movable plate has a limiting structure. The indication device is located on the gas outlet side of the pressure relief channel. The indicating device is equipped with an alarm. The indicating device includes a housing with a pressure relief port. Inside the housing, a vent plate, a diaphragm, and a pressure plate are disposed. The vent plate is positioned towards the pressure relief channel. The diaphragm is positioned adjacent to the vent plate. The pressure plate moves under the action of the fusible gas and reaches the trigger position. The pressure plate has a protruding contact. A triggering component is disposed inside the housing. When the pressure plate reaches the trigger position and is held in the trigger position by means of a locking structure, the protruding contact acts on the triggering component to trigger the alarm to issue a warning.

[0007] According to the aforementioned fuse including a fuse indication device, the limiting structure includes a baffle disposed on the movable plate, the baffle cooperating with the protective shell to restrict the movement of the movable plate along a predetermined track.

[0008] According to the aforementioned fuse including a fuse indication device, the limiting structure includes a pin disposed at the bottom of the protective housing and a slot disposed in the movable plate, the pin being inserted into the slot to limit the lateral movement of the movable plate.

[0009] According to the aforementioned fuse including a fuse indicator, the opening size of the slot is larger than the outer diameter of the pin, so that the pin can be inserted into the slot when the movable plate moves relative to the pin during the assembly and disassembly process, and the bottom of the pin is provided with an arc.

[0010] According to the aforementioned fuse including a fuse indication device, the locking structure includes a latch groove disposed on the inner wall of the housing and a latch disposed on the pressure plate. When the pressure plate reaches the trigger position, the latch engages with the latch groove to keep the pressure plate in the trigger position.

[0011] According to the aforementioned fuse including a fuse indication device, the triggering component includes a spring and an electrical contact. When the pressure plate is held in the trigger position, the convex contact pushes the spring and the electrical contact to electrically connect, thereby triggering the alarm to issue a warning.

[0012] According to the aforementioned fuse including a fuse indication device, a second spring is provided inside the housing, and the second spring is located between the pressure plate and the spring piece.

[0013] According to the aforementioned fuse including a fuse indicator device, when the pressure plate is not held in the triggered position, the pressure relief port is connected to the outside to relieve pressure inside the housing, and when the pressure plate is held in the triggered position, the pressure relief port relieves pressure to the relatively sealed space.

[0014] Beneficial effects The present invention discloses a fuse including a fuse-breaking indicator device. The fuse and the housing form a relatively sealed space and are provided with a pressure relief channel connected to the indicator device. When the fuse breaks, the gas released can act on the diaphragm along a predetermined path, thereby pushing the pressure plate to the trigger position and holding it under the action of the locking structure. Then, the convex contact cooperates with the triggering assembly to trigger the alarm to issue a warning, which improves the reliability and continuity of the warning trigger after the fuse breaks.

[0015] Meanwhile, by constraining the state of the assembly / disassembly opening through the movable plate, spring No. 1, and limiting structure, the release of fusible gas in non-predictive directions can be reduced, which helps to concentrate the fusible gas along the pressure relief channel to act on the indicator device and improve trigger consistency. In addition, the pressure relief port can switch between the pressure relief of the outer shell and the relatively sealed space under different positions of the pressure plate. While ensuring alarm triggering, it is conducive to timely gas release. The structure is compact, easy to install, and suitable for invisible scenarios such as inside cabinets and boxes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a fuse that includes a fuse indication device.

[0017] Figure 2 A cross-sectional view of a fuse including a fuse indication device.

[0018] Figure 3 This is a further cross-sectional schematic diagram of a fuse including a fuse indication device.

[0019] Figure 4 This is a schematic diagram of the internal structure of a fuse with a fuse indication device after removing the toggle handle.

[0020] Figure 5 This is a cross-sectional schematic diagram of a fuse including a fuse indication device from another angle.

[0021] Figure 6 This is a cross-sectional schematic diagram of the indicator device in a fuse that includes a fuse indicating a blowout device.

[0022] Figure 7 This is an exploded schematic diagram of a portion of the structure of the indicator device in a fuse that includes a fuse indicating a fusibility.

[0023] Figure 8 This is a schematic diagram of the spring structure and electrical contact structure in a fuse that includes a fuse indication device.

[0024] Attached icon numbers: 1. Fuse holder; 11. Movable plate; 12. Spring No. 1; 13. Rotary shaft hole; 2. Toggle handle; 21. Rotary shaft; 22. Protective housing; 3. Indicating device; 31. Outer housing; 311. Clip groove; 312. Pressure relief port; 32. Vent plate; 33. Diaphragm; 34. Pressure plate; 341. Protruding contact; 35. Spring No. 2; 36. Clip; 37. Spring piece; 38. Electrical contact piece; 39. Alarm; 4. Fuse. Detailed Implementation

[0025] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application.

[0026] The following is in conjunction with the appendix Figures 1 to 8 An embodiment of this utility model will be further described below. For example... Figures 1 to 5 As shown, the fuse holder 1 is a carrier for mounting the fuse 4. The fuse holder 1 can be made of insulating material and has terminals for connecting to external circuits and conductive contact structures that mate with the fuse 4. After the fuse 4 is installed in the fuse holder 1, its two ends form an electrical connection with the conductive contact structures on the fuse holder 1, thereby connecting the fuse 4 in series in the protected circuit. The above-mentioned electrical connection structure is a conventional configuration of fuse holders. This embodiment is only described in the specification as necessary to understand the installation position and replacement operation of the fuse 4, and is not considered as a necessary technical feature of this utility model.

[0027] To facilitate the installation and removal of fuse 4, a toggle handle 2 is provided on the fuse holder 1. The toggle handle 2 rotates around a pivot 21, which passes through a pivot hole 13 on the fuse holder 1, thereby allowing the toggle handle 2 to rotate relative to the fuse holder 1. The toggle handle 2 and fuse 4 can be linked using a toggle fork, a clamping part, or other common mating structures, enabling the toggle handle 2 to switch fuse 4 between the installed and removed positions during installation and removal operations. Figure 2 , Figure 3As shown, when the toggle handle 2 is in the installation position, the fuse 4 is located in the predetermined installation cavity of the fuse holder 1 and is pressed and engaged with the conductive contact structure; when the toggle handle 2 is turned to the disassembly position, the fuse 4 can be taken out of the installation cavity and removed or installed from the opening side of the protective shell 22.

[0028] The housing 22 is fixedly mounted on the fuse holder 1, and the housing 22 and the fuse 4 together form a relatively sealed space when installed. This relatively sealed space does not require a complete seal, but rather means that after the fuse 4 is installed, the enclosure structure formed between the housing 22 and the fuse 4 can constrain and guide the main direction of fusible gas release, making the fusible gas more likely to flow along the preset pressure relief channel, rather than escaping in large quantities from the installation / removal opening or other unplanned gaps. To achieve gas guidance, the housing 22 has a pressure relief channel connected to the indicator 3 on the side near the indicator 3. The pressure relief channel can be formed by a through hole, guide cavity, or channel formed in conjunction with the fuse holder 1 on the housing 22. The inlet side of the pressure relief channel is connected to the relatively sealed space, and the outlet side is opposite to the inlet end of the indicator 3, so that the gas pressure formed in the relatively sealed space can act on the indicator 3.

[0029] Since fuse 4 needs to be replaced, the housing 22 inevitably forms an opening on one side for installing and removing fuse 4. To prevent the opening from becoming a preferred vent for fusible gas, a movable plate 11 is provided at the opening. The movable plate 11 can move linearly or approximately linearly along the guide structure on the housing 22, and under the action of spring 12, the movable plate 11 is in the position of closing the opening. Figure 3 It can be seen that when the movable plate 11 is located at the opening, its outer surface is relatively close to the inner wall of the protective shell 22, thereby blocking the opening when the fuse 4 is installed, and suppressing the leakage of the relatively sealed space on the opening side. In order to ensure smooth installation and removal, the movable plate 11 is not fixed, but can be displaced when the handle 2 moves the fuse 4. The first spring 12 is compressed or stretched during the installation and removal process. After the fuse 4 is in place, the movable plate 11 is reset under the elastic force of the first spring 12 to restore the blocking of the opening.

[0030] To prevent the movable plate 11 from tilting, jamming, or deviating from its predetermined trajectory during assembly and disassembly, a limiting structure is provided for the movable plate 11. Firstly, the limiting structure includes a baffle 111 disposed on the movable plate 11. The baffle 111 can be a strip-shaped structure protruding along the edge of the movable plate 11, with a corresponding guide groove or guide surface provided on the protective shell 22. The baffle 111 cooperates with the protective shell 22, allowing the movable plate 11 to move along a predetermined track during displacement. Through the guiding effect of the baffle 111, the probability of the movable plate 11 rotating or tilting due to uneven force is reduced, improving the smoothness of the assembly and disassembly process, and making it easier for the movable plate 11 to return to its effective blocking position for the opening after reset.

[0031] Relying solely on the guidance of spring 12 and baffle 111, an unfavorable situation may still occur at the moment of fuse failure: the pressure formed by the fusible gas in the relatively sealed space exerts a pushing force on the movable plate 11. Under this pushing force, the movable plate 11 may shift laterally or be pushed open, causing lateral pressure relief on the open side. This results in a decrease in the amount of gas entering the pressure relief channel, thereby affecting the triggering reliability of the indicating device 3. Therefore, this embodiment further provides a pin 221 at the bottom of the protective shell 22 and a slot 112 on the movable plate 11. The pin 221 is inserted into the slot 112 to restrict the lateral movement of the movable plate 11. Figure 3 As shown in the enlarged view on the right, the pin 221 is a limiting member that protrudes upward from the bottom of the protective shell 22. The slot 112 is opened at the corresponding position of the movable plate 11. When the movable plate 11 is in the closed opening position, the pin 221 is located in the slot 112 or is in relative cooperation with the slot 112. Thus, when the movable plate 11 is subjected to lateral force, the pin 221 and the side wall of the slot 112 have a limiting effect, which inhibits the movable plate 11 from shifting laterally.

[0032] In this embodiment, the opening size of the slot 112 is larger than the outer diameter of the pin 221, so that the pin 221 can be smoothly inserted into the slot 112 when the movable plate 11 moves relative to it during the assembly and disassembly process, avoiding interference between the pin 221 and the slot 112 due to assembly errors or the rotation trajectory of the toggle handle 2, which could cause the pin 221 to jam. To further reduce insertion resistance and improve the insertion process, the bottom of the pin 221 is provided with an arc. The arc can guide and buffer the pin 221 when it is inserted relative to the slot 112, making it easier for the pin 221 to enter the slot 112, while reducing the risk of scratching and jamming during the resetting process of the movable plate 11. An appropriate gap can be maintained between the slot 112 and the pin 221. This gap ensures smooth assembly and disassembly, and when the fusible gas causes the movable plate 11 to be subjected to lateral force, the pin 221 can still contact the side wall of the slot 112 within a small displacement range and form a limit, thereby providing a constraint force to prevent the movable plate 11 from moving laterally, and making the fusible gas more inclined to enter the indicator device 3 along the pressure relief channel.

[0033] Except for the open side, the other side of the housing 22 can be fitted against the cabinet or outer wall, with only the vent window corresponding to the indicator 3 remaining. This ensures that after the fuse 4 is installed and returned to its original position, the vent side of the relatively sealed space faces the vent plate 32 area of ​​the indicator 3. This arrangement limits the main venting direction of the fusible gas to entering the indicator 3 from the relatively sealed space via the pressure relief channel, thereby mitigating the adverse effects of gas escape from other directions on the triggering process. The aforementioned structure of "fitting against the outer wall with a partial opening" is a common spatial arrangement and can be adapted to the installation position within the cabinet, as long as the connection between the pressure relief channel and the indicator 3 remains stable.

[0034] like Figure 1 , Figures 6 to 8 As shown, the indicator 3 is located on the air outlet side of the pressure relief channel, and the indicator 3 is equipped with an alarm 39. The alarm 39 can be an audible and visual alarm, a buzzer, an indicator light, a trigger terminal of a communication module, or a combination thereof, and the specific form can be selected according to the application scenario. The alarm 39 can be powered independently, such as by a built-in battery; or it can be powered by an external low-voltage power supply and connected to the monitoring system inside the cabinet through an electrical connection terminal.

[0035] The indicating device 3 includes a housing 31, which forms the mounting cavity and gas action cavity of the indicating device 3. A pressure relief port 312 is provided on the housing 31. The pressure relief port 312 can be arranged in the form of an array of holes on the side wall or end face of the housing 31. The pressure relief port 312 communicates with the outside and is used to relieve pressure inside the housing 31 or a relatively sealed space under specific conditions. A vent plate 32, a diaphragm 33, and a pressure plate 34 are provided inside the housing 31. The vent plate 32 is positioned towards the pressure relief channel and can be a rigid plate with multiple vent holes. Its function is to divert and equalize the pressure of the fusible gas entering the indicating device 3, so that the gas pressure acts more evenly on the diaphragm 33, while also providing some support and protection for the diaphragm 33. The diaphragm 33 is positioned adjacent to the vent plate 32 and can be made of an elastic material, capable of deformation under gas pressure. The pressure plate 34 is located on the back side of the diaphragm 33. The pressure plate 34 moves and reaches the trigger position after the diaphragm 33 is pushed by the fusible gas. Figure 7 The explosion diagram shows that the vent plate 32, the diaphragm 33 and the pressure plate 34 are stacked in sequence along the moving direction of the pressure plate 34. After the gas enters through the pressure relief channel, it first acts on one side of the vent plate 32, and then pushes the diaphragm 33 to deform through the vent holes of the vent plate 32. The diaphragm 33 transmits the force to the pressure plate 34, causing the pressure plate 34 to move in a predetermined direction.

[0036] A protruding contact 341 is provided on the pressure plate 34, which is used to apply force to the triggering component after the pressure plate 34 reaches the triggering position. The triggering component is provided inside the housing 31, and includes a spring piece 37 and an electrical contact piece 38. The spring piece 37 can be an elastic conductive sheet, and the electrical contact piece 38 can be a fixed conductive sheet or a conductive terminal. When the pressure plate 34 reaches the triggering position and is held in the triggering position by means of a locking structure, the protruding contact 341 acts on the spring piece 37, electrically connecting the spring piece 37 and the electrical contact piece 38, thereby forming a closed circuit to trigger the alarm 39 to issue a warning. To improve the triggering feel and reduce mechanical shock, a second spring 35 is provided inside the housing 31, located between the pressure plate 34 and the spring piece 37. The second spring 35 can be a compression spring. On the one hand, it provides a buffer stroke before the pressure plate 34 pushes the spring 37, reducing the instantaneous impact of the convex contact 341 on the spring 37. On the other hand, it provides elastic compensation when assembly tolerances exist, making the contact pressure between the spring 37 and the electrical contact 38 more stable and improving long-term contact reliability. The second spring 35 is only used for the triggering mechanical matching inside the indicating device 3, and is distinguished from the first spring 12 of the movable plate 11 to avoid confusion in description and assembly.

[0037] To ensure continuous alarm activation after triggering, this embodiment employs a locking structure. The locking structure includes a latching groove 311 on the inner wall of the housing 31 and a latch 36 on the pressure plate 34. The latch 36 can be an elastic hook structure or a protruding structure with rebound capability, and the latching groove 311 can be a matching recess or stepped structure. When the pressure plate 34 moves to the trigger position under the push of the diaphragm 33, the latch 36 engages with the latching groove 311, holding the pressure plate 34 in the trigger position. Because the pressure plate 34 is locked, the protruding contact 341 continuously applies force to the spring 37, maintaining electrical connection between the spring 37 and the electrical contact 38. This allows the alarm 39 to continuously emit a warning signal, meeting the need for continuous and clear alarms in situations where visibility is limited, such as inside cabinets or boxes. Compared to indicator structures that rely solely on momentary action, this locking method can maintain the alarm state for a long time after the fuse is blown, until maintenance personnel replace the fuse 4 and reset or replace the indicator device 3.

[0038] The pressure relief port 312 is configured as an array of holes and is located in an area covered by the pressure plate 34 or a shielding component linked to the pressure plate 34. When the pressure plate 34 is not held in the trigger position, the pressure relief port 312 communicates with the outside for depressurizing the outer casing 31. When the fuse is broken and the pressure plate 34 moves and locks in the trigger position, the latch 36 engages with the latch groove 311, changing the fit between the pressure plate 34 and the outer casing 31, thus connecting the pressure relief port 312 with the relatively sealed space and depressurizing the relatively sealed space. After the fusible gas completes its action on the diaphragm 33 and triggers the fuse, it enters the outer casing 31 through the pressure relief channel and is discharged outward through the pressure relief port 312, balancing trigger reliability and timely depressurization. The pressure relief port 312 thus becomes one of the pressure relief outlets of the relatively sealed space. Since the relatively sealed space is connected to the indicating device 3 through the pressure relief channel, the fusible gas can be released outward through the pressure relief port 312 after pushing the diaphragm 33 and completing the triggering process. This ensures timely pressure relief while maintaining triggering reliability, preventing the gas from remaining in the relatively sealed space for a long time. This allows the gas to act on the diaphragm 33 in a concentrated manner during the triggering phase and to be released smoothly after triggering, thus balancing reliable triggering and safe pressure relief.

[0039] Regarding the electrical connection, the connection between fuse 4 and fuse holder 1 can employ common plug-in or clamp-type structures. For example, conductive claws can be installed inside fuse holder 1, and both ends of fuse 4 can be inserted and pressed into contact with the conductive claws. During the rotation of handle 2 to the installation position, a holding force is applied to fuse 4, ensuring stable electrical contact. The trigger circuit formed by the spring 37 and electrical contact 38 of indicator device 3 can be arranged independently of the main fuse circuit, and its wires can be led out from fuse holder 1 and connected to alarm 39 or external monitoring terminal. To prevent the first spring 12 of movable plate 11 from interfering with the electrical connection structure, the first spring 12 can be arranged in a cavity isolated from the main conductive path, or an insulating partition can be installed inside fuse holder 1 to separate the mechanical cavity from the conductive cavity, ensuring that the installation / removal actions, spring reset, and electrical contact do not affect each other. The above isolation and wiring methods are standard engineering designs and can be adjusted according to cabinet space and electrical safety requirements.

[0040] The working process of this embodiment can be summarized as follows. Under normal working conditions, the fuse 4 is installed on the fuse holder 1, the toggle handle 2 is in the installation position, the movable plate 11 closes the opening of the protective shell 22 under the action of the first spring 12, the baffle 111 cooperates with the protective shell 22 to position the movable plate 11 along a predetermined track, the pin 221 is inserted into the slot 112 and provides lateral limit for the movable plate 11. At this time, the protective shell 22 and the fuse 4 form a relatively sealed space, the pressure relief channel between the relatively sealed space and the indicating device 3 is in a connected state, the pressure plate 34 inside the indicating device 3 is in the untriggered position, the buckle 36 is not engaged with the buckle slot 311, the spring piece 37 and the electrical contact piece 38 are in a separated state, the alarm 39 does not work, the pressure relief port 312 is connected to the outside, and is used to relieve pressure and equalize pressure inside the outer shell 31.

[0041] When the protected circuit experiences an overcurrent or short circuit, causing fuse 4 to blow, the gas generated inside fuse 4 enters the relatively sealed space through its structural gaps. Because the release of gas from the open side of the relatively sealed space is blocked and constrained by the movable plate 11, especially the suppression of lateral movement of the movable plate 11 by the pin 221 and slot 112, the movable plate 11 is less likely to shift laterally or be pushed open under gas impact. The gas in the relatively sealed space tends to enter the indicating device 3 along the pressure relief channel. Upon reaching the indicating device 3, the gas first acts on the vent plate 32, which disperses and equalizes the airflow. Subsequently, the gas pressure pushes the diaphragm 33 to deform towards the pressure plate 34, transmitting force to the pressure plate 34, causing it to move in a predetermined direction. As the pressure plate 34 moves, the latch 36 gradually approaches the latch groove 311. When the pressure plate 34 reaches the trigger position, the latch 36 engages with the latch groove 311, locking the pressure plate 34 in place. After the pressure plate 34 is locked, the convex contact 341 continues to act on the triggering component, pushing the spring 37 to electrically connect with the electrical contact 38, thereby triggering the alarm 39 to issue an alarm. Due to the holding effect of the locking structure, the alarm state can continue to exist. Even if the gas pressure in the relatively sealed space subsequently drops, the alarm 39 can still maintain the alarm output, meeting the identification needs of maintenance personnel in non-visual environments.

[0042] After triggering, the pressure plate 34 remains in the triggered position, and the pressure relief port 312 forms a stable venting path with the outside. Residual gas in the relatively sealed space can enter the indicator device 3 through the pressure relief channel and finally dissipate outward through the pressure relief port 312, thereby venting the pressure in the relatively sealed space and preventing long-term gas accumulation. Since the pressure relief port 312 adopts an array of holes, the venting capacity can be engineered by adjusting the hole diameter, number of holes, and distribution to meet the requirement of timely pressure relief after fuse failure without weakening the pressure effect during the triggering phase.

[0043] When replacing fuse 4, maintenance personnel use the toggle handle 2 to rotate it around the pivot 21 at the pivot hole 13, causing fuse 4 to move away from its installation position. During installation and removal, the movable plate 11 is displaced by the fuse 4 or the toggle handle 2, the first spring 12 is compressed or stretched, and the pin 221 smoothly completes relative insertion and disengagement under the guidance of the opening size of the slot 112 and the bottom arc, avoiding jamming. After the new fuse 4 is installed and rotated back to its installation position with the toggle handle 2, the movable plate 11 resets and closes the opening under the action of the first spring 12, the pin 221 re-enters the slot 112 and forms a lateral limit, the relative sealing space is restored, and the indicator device 3 can be restored to its initial state by replacement or reset. If the alarm 39 adopts a resettable structure, maintenance personnel can press or rotate the reset component after replacing the fuse 4 to disengage the latch 36 from the latch slot 311, thereby returning the pressure plate 34 to the untriggered position, disconnecting the spring 37 from the electrical contact 38, and stopping the alarm 39. The reset method can be set according to the specific product form, and this embodiment does not limit it.

[0044] As can be seen from the above structure and working process, this embodiment uses the protective shell 22 and the movable plate 11 to constrain the path of the fusible gas, so that the fusible gas acts on the diaphragm 33 of the indicating device 3 as concentrated and directionally as possible, thereby improving the triggering reliability. The lateral limit provided by the pin 221 and the slot 112 makes it difficult for the movable plate 11 to release in a non-predictable direction under the impact of the fusible gas, which is conducive to maintaining the effective gas flow of the pressure relief channel; the locking structure allows the alarm 39 to remain continuously after being triggered, meeting the need for continuous warning; the pressure relief port 312 can switch between pressure relief inside the outer shell 31 and the relatively sealed space under different positions of the pressure plate 34, which is conducive to timely gas release while ensuring alarm triggering. The overall structure is compact, which is convenient for installation in cabinets, boxes and other invisible scenarios, and has good engineering adaptability and long-term reliability.

[0045] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A fuse comprising a fuse link indicating device, comprising a fuse holder (1) and a fuse link (4) mounted on the fuse holder (1), characterized in that The fuse holder (1) is provided with a protective shell (22), which together with the fuse (4) forms a relatively sealed space for guiding the fusible gas. The relatively sealed space is provided with a pressure relief channel communicating with the indicator (3). The protective shell (22) is provided with an opening for installing and removing the fuse (4). A movable plate (11) is provided at the opening. The movable plate (11) is in the position of closing the opening under the action of a first spring (12), and the movable plate (11) is provided with a limiting structure. The indicator (3) is located on the outlet side of the pressure relief channel. The indicator (3) is equipped with an alarm (39). The indicator (3) includes a housing (31). The housing (31) is equipped with a pressure relief port (312). A vent plate (32), a diaphragm (33), and a pressure plate (34) are arranged inside the housing (31). The vent plate (32) is arranged facing the pressure relief channel. The diaphragm (33) is arranged adjacent to the vent plate (32). The pressure plate (34) moves under the action of the diaphragm (33) and reaches the trigger position. The pressure plate (34) is equipped with a protruding contact (341). A triggering component is arranged inside the housing (31). When the pressure plate (34) reaches the trigger position and is held in the trigger position by means of a locking structure, the protruding contact (341) acts on the triggering component to trigger the alarm (39) to issue a fuse indication.

2. The fuse containing a fuse link indicating device according to claim 1, characterized in that The limiting structure includes a baffle (111) disposed on the movable plate (11), the baffle (111) cooperating with the protective shell (22) to restrict the movable plate (11) from moving along a predetermined track.

3. The fuse containing a fuse link indicating device according to claim 1, characterized in that, The limiting structure includes a pin (221) disposed at the bottom of the protective shell (22) and a slot (112) disposed on the movable plate (11). The pin (221) is inserted into the slot (112) to limit the lateral movement of the movable plate (11).

4. The fuse containing a fuse link indicating device according to claim 3, characterized in that The opening size of the slot (112) is larger than the outer diameter of the pin (221) so that the pin (221) can be inserted into the slot (112) when the movable plate (11) moves relative to the slot during the assembly and disassembly process, and the bottom of the pin (221) is provided with an arc.

5. The fuse containing a fuse link indicating device according to claim 1, characterized in that, The locking structure includes a snap-fit ​​groove (311) disposed on the inner wall of the outer shell (31) and a snap-fit ​​(36) disposed on the pressure plate (34). When the pressure plate (34) reaches the trigger position, the snap-fit ​​(36) engages with the snap-fit ​​groove (311) to keep the pressure plate (34) in the trigger position.

6. The fuse containing a fuse link indicating device according to claim 1, characterized in that, The triggering component includes a spring (37) and an electrical contact (38). When the pressure plate (34) is held in the triggering position, the protruding contact (341) pushes the spring (37) and the electrical contact (38) to electrically connect, thereby triggering the alarm (39) to issue a warning.

7. The fuse containing a fuse link indicating device according to claim 6, characterized in that A second spring (35) is provided inside the outer shell (31), and the second spring (35) is located between the pressure plate (34) and the spring piece (37).

8. The fuse containing a fuse link indicating device according to claim 1, characterized in that, When the pressure plate (34) is not held in the trigger position, the pressure relief port (312) is connected to the outside to relieve pressure inside the outer shell (31), and when the pressure plate (34) is held in the trigger position, the pressure relief port (312) relieves pressure on the relatively sealed space.

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