Rail transit fuse device with fusing indication

Abstract

The utility model discloses a rail transit fuse device with fusing indication, which comprises a bottom shell, a fuse arranged in the bottom shell, a crank arm assembly which is rotatably arranged in the bottom shell and is in contact with a firing pin of the fuse, a cover plate which covers the upper part of the bottom shell, and a sliding block which is arranged on the cover plate and can be elastically reset, the lower side of the sliding block abuts against the upper end of a crank arm of the crank arm assembly, indicating strips are arranged on the sliding block, indicating holes are formed in the cover plate, and different indicating strips are displayed in the indicating holes through sliding of the sliding block on the cover plate. The device is reliable in structure and good in use performance, the crank arm assembly drives the sliding block to move, and the sliding block is matched with the indication strip, so that an inspection worker can observe the plate turning state of the fuse device through the visual grounding device high-voltage chamber observation window, and timely find whether the fuse is burnt out or not; the state of the fuse can be detected without opening a high-voltage chamber of the grounding device, which is convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, specifically to a rail transit fuse device with a fuse indication. Background Technology

[0002] In urban rail transit visual grounding devices, two fuses are redundantly installed in the voltage detection circuit of the high-voltage room to ensure that the fuses will blow in time and disconnect the voltage detection circuit in the event of a fault in the voltage detection circuit, thus protecting the normal operation of the contact network.

[0003] Due to the limited space inside the high-voltage chamber of a visual grounding device, high-voltage DC fuses are often installed inside the insulating housing to ensure sufficient electrical clearance and creepage distance. Existing fuses have a compact structure and high space utilization, enabling miniaturization of visual grounding devices while meeting insulation parameter requirements. However, they also have the following problems:

[0004] To ensure sufficient electrical clearance and creepage distance within a limited space, fuses must be enclosed in a sealed insulating housing. When a fuse burns out, it cannot be detected and repaired or replaced in a timely manner. In particular, when two fuses burn out simultaneously, the voltage detection circuit of the visual grounding device will be disconnected from the input line, resulting in no voltage detection. This can easily lead to misjudgment of the energized status of the contact network, misleading maintenance personnel to carry out subsequent maintenance work and causing serious safety accidents. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a rail transit fuse device with a fuse indication.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A rail transit fuse device with fuse indication includes a bottom shell, a fuse placed inside the bottom shell, a crank arm assembly rotatably disposed inside the bottom shell and in contact with the striker of the fuse, a cover plate covering the upper part of the bottom shell, and a sliding block disposed on the cover plate and capable of elastic reset. The lower side of the sliding block abuts against the upper end of the crank arm of the crank arm assembly. An indicator strip is provided on the sliding block, and an indicator hole is provided on the cover plate. Different indicator strips are displayed in the indicator hole by sliding the sliding block on the cover plate.

[0007] Furthermore, the crank arm assembly includes a rotating shaft disposed inside the bottom housing and a crank arm that is fitted on the rotating shaft. The lower end of the crank arm contacts the striker of the fuse, and the upper end of the crank arm abuts against the lower side of the sliding block.

[0008] Furthermore, a return spring is connected to the end of the sliding block away from the crank arm, and the other end of the return spring is directly or indirectly fixed to the cover plate.

[0009] Furthermore, a fixing plate is provided on the inner wall of the cover plate, and the end of the return spring away from the sliding block is connected to the fixing plate.

[0010] Furthermore, a groove is provided at the upper end of the sliding block, and a slide rail is provided on the inner wall of the cover plate to cooperate with the groove. The sliding block slides on the cover plate through the groove and slide rail structure.

[0011] Furthermore, a partition is provided inside the bottom shell to divide the bottom shell into multiple chambers, and the fuse is located in the chamber.

[0012] Furthermore, the indicator bars include green indicator bars and red indicator bars.

[0013] This utility model has the following advantages: The rail transit fuse device with fuse indication provided by this utility model has a reliable structure and good performance. Through the movement of the sliding block driven by the crank arm assembly and the cooperation between the sliding block and the indicator strip, inspection personnel can observe the fuse device's flip-up status through the observation window of the high-voltage compartment of the visual grounding device, promptly detecting whether the fuse is burnt out. This eliminates the need to open the high-voltage compartment of the grounding device to check the fuse status, making it convenient and quick. Furthermore, all components in this device adopt a mechanical structure, requiring no external auxiliary power supply, resulting in high reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the present invention;

[0016] Figures 1 to 2 The reference numerals in the attached drawings are respectively: 1-bottom shell, 2-fuse, 20-fire pin, 3-crank arm assembly, 4-cover plate, 5-sliding block, 6-indicator hole, 30-rotating shaft, 31-crank arm, 7-reset spring, 8-fixed plate, 9-partition plate. Detailed Implementation

[0017] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0018] like Figures 1 to 2As shown, a rail transit fuse device with a fuse indication includes a base shell 1, a fuse 2 placed inside the base shell 1, a crank arm assembly 3 rotatably disposed inside the base shell 1 and in contact with the striker 20 of the fuse 2, a cover plate 4 covering the upper part of the base shell 1, and a sliding block 5 disposed on the cover plate 4 and capable of elastic reset. The lower side of the sliding block 5 abuts against the upper end of the crank arm 31 of the crank arm assembly 3. An indicator strip is provided on the sliding block 5, and an indicator hole 6 is provided on the cover plate 4. Different indicator strips are displayed in the indicator hole 6 by sliding the sliding block 5 on the cover plate 4. The indicator strips usually include two types: green indicator strips and red indicator strips. When a green indicator strip is displayed in the indicator hole 6, it indicates a normal state; when a red indicator strip is displayed in the indicator hole 6, it indicates a fuse-broken state. The cover plate 4 covers the upper part of the base shell 1, serving a protective and sealing function. The indicator hole 6 on the cover plate 4 is used to display the indicator strips on the sliding block 5. The sliding block 5 is mounted on the cover plate 4 and can be elastically reset. The lower side of the sliding block 5 abuts against the upper end of the crank arm 31 of the crank arm assembly 3. Therefore, when the crank arm 31 rotates, the sliding block 5 will slide on the cover plate 4. An indicator bar is provided on the sliding block 5. As the sliding block 5 slides, different indicator bars will be displayed in the indicator holes 6 of the cover plate 4. Inspection personnel can observe the flip-up status of the fuse device through the observation window of the high-voltage compartment of the visual grounding device, and promptly detect whether the fuse is burnt out, without having to open the high-voltage compartment of the grounding device to check the fuse status.

[0019] The base shell 1 is the basic structure of the entire device, housing internal components such as the fuse 2 and the crank arm assembly 3. The base shell 1 is typically made of insulating material to ensure electrical safety. The fuse 2 is the core component of the device, responsible for melting and protecting the circuit in case of overcurrent. The fuse 2 usually includes a striker 20, which pops out when the fuse 2 blows. The crank arm assembly 3 is rotatably mounted inside the base shell 1 and contacts the striker 20 of the fuse 2. When the fuse 2 blows, the popped striker 20 pushes the crank arm assembly 3 to rotate. The upper end of the crank arm assembly 3 abuts against the lower side of the sliding block 5. Therefore, the rotation of the crank arm 31 causes the sliding block 5 to move, thereby changing the indicator bar on the sliding block 5 to provide a clear status indication.

[0020] When in use, it includes the following states:

[0021] Normal state: When fuse 2 does not blow, the striker 20 does not pop out, the crank arm assembly 3 remains in place, the sliding block 5 is in the initial position, and the indicator hole 6 displays a green indicator bar indicating the "normal" state.

[0022] Fuse-out status: When fuse 2 blows, the striker 20 pops out, pushing the crank arm assembly 3 to rotate. The rotation of the crank arm 31 causes the sliding block 5 to slide, causing the indicator hole 6 to display the red indicator bar indicating the "fuse-out" status.

[0023] Reset: After replacing fuse 2, sliding block 5 can return to its initial position, and indicator hole 6 will once again display the green indicator bar indicating "normal" status.

[0024] A return spring 7 is connected to the end of the sliding block 5 away from the crank arm 31. The other end of the return spring 7 is directly or indirectly fixed to the cover plate 4. When directly fixed, the return spring 7 is directly positioned on the cover plate 4. When indirectly fixed, a fixing plate 8 is provided on the inner wall of the cover plate 4, and the end of the return spring 7 away from the sliding block 5 is connected to the fixing plate 8. Regardless of the method, as long as the smooth sliding and elastic return of the sliding block 5 can be achieved, it is acceptable.

[0025] In one embodiment of this solution, the crank arm assembly 3 includes a rotating shaft 30 disposed inside the bottom shell 1 and a crank arm 31 fitted on the rotating shaft 30. The lower end of the crank arm 31 contacts the striker 20 of the fuse 2, and the upper end of the crank arm 31 abuts against the lower side of the sliding block 5.

[0026] There are two modes of motion in which the crank arm 31 drives the sliding block 5, which corresponds to two different configurations of the sliding block 5 and the crank arm 31. One mode is that the crank arm 31 pushes the sliding block 5. In this mode, the upper end of the crank arm 31 has a larger contact surface with the sliding block 5, and it is always in contact during the pushing process. In this configuration, the return spring 7 is initially in an extended state. As the crank arm 31 drives the sliding block 5 to move continuously, the return spring 7 is compressed. When the fuse 2 is replaced, the elastic reset action of the return spring 7 drives the sliding block 5 to move back to the initial position.

[0027] Another method involves using a return spring 7 to move the sliding block 5. In this method, the upper end of the crank arm 31 contacts the lower corner of the sliding block 5, resulting in a small contact area. Only a very small external force is needed to ensure that the return spring 7 does not move the sliding block 5 under normal conditions. In this method, the return spring 7 is initially in a compressed state. When the striker 20 of the fuse 2 pushes the crank arm 31 to rotate, the crank arm 31 rotates around the rotation axis 30 by a certain angle and then detaches from the sliding block 5. At this time, the sliding block 5 slides under the push of the return spring 7, and the red indicator strip on the sliding block 5 is displayed in the indicator hole 6, indicating that the fuse 2 in this circuit has blown.

[0028] To improve the stability of the sliding block 5 during sliding, this invention provides a groove at the upper end of the sliding block 5, and a slide rail that mates with the groove is provided on the inner wall of the cover plate 4. The sliding block 5 is slidably fitted onto the cover plate 4 through the groove and slide rail structure. There are one or more grooves, typically elongated in shape, extending along the sliding direction of the sliding block 5. The groove serves to accommodate the slide rail on the inner wall of the cover plate 4 and provide guidance for the sliding block 5, enabling it to slide in a fixed direction. The shape and size of the slide rail match the groove, ensuring smooth sliding of the sliding block 5. The sliding block 5 is mounted on the cover plate 4 through the fit between the groove and the slide rail, with the slide rail embedded in the groove, forming a sliding pair. This fit allows the sliding block 5 to slide smoothly along the slide rail direction on the cover plate 4, while preventing the sliding block 5 from detaching from the cover plate 4 or shifting.

[0029] The bottom shell 1 is internally divided into multiple chambers by a partition 9, and fuses 2 are disposed within each chamber. The partition 9 is typically made of insulating material to ensure electrical isolation and safety. Furthermore, dividing the bottom shell 1 into multiple chambers by the partition 9 allows for the placement of multiple fuses 2 within the same bottom shell 1, improving structural performance. Each chamber contains an individual fuse 2, a crank arm assembly 3, and a corresponding sliding block 5 and indicator hole 6 on the cover plate 4. This allows each circuit's mechanical structure to be independently driven, and the burnout of any single fuse can be individually indicated.

[0030] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rail transit fuse device with a fuse indication, characterized in that, The device includes a bottom shell (1), a fuse (2) placed inside the bottom shell (1), a crank arm assembly (3) rotatably disposed inside the bottom shell (1) and in contact with the striker (20) of the fuse (2), a cover plate (4) covering the upper part of the bottom shell (1), and a sliding block (5) disposed on the cover plate (4) and capable of elastic reset. The lower side of the sliding block (5) abuts against the upper end of the crank arm (31) of the crank arm assembly (3). An indicator strip is provided on the sliding block (5), and an indicator hole (6) is provided on the cover plate (4). Different indicator strips are displayed in the indicator hole (6) by sliding the sliding block (5) on the cover plate (4).

2. The rail transit fuse device with fuse indication according to claim 1, characterized in that, The crank arm assembly (3) includes a rotating shaft (30) disposed inside the bottom shell (1) and a crank arm (31) fitted on the rotating shaft (30). The lower end of the crank arm (31) contacts the striker (20) of the fuse (2), and the upper end of the crank arm (31) abuts against the lower side of the sliding block (5).

3. The rail transit fuse device with fuse indication according to claim 2, characterized in that, The end of the sliding block (5) away from the crank arm (31) is connected to a return spring (7), and the other end face of the return spring (7) is directly or indirectly fixed to the cover plate (4).

4. The rail transit fuse device with fuse indication according to claim 3, characterized in that, A fixing plate (8) is provided on the inner wall of the cover plate (4), and the end of the reset spring (7) away from the sliding block (5) is connected to the fixing plate (8).

5. The rail transit fuse device with fuse indication according to claim 1, characterized in that, The upper end of the sliding block (5) is provided with a sliding groove, and the inner wall of the cover plate (4) is provided with a slide rail that cooperates with the sliding groove. The sliding block (5) is slidably fitted on the cover plate (4) through the sliding groove and slide rail structure.

6. The rail transit fuse device with fuse indication according to any one of claims 1 to 5, characterized in that, The bottom shell (1) is provided with a partition (9) inside, which divides the bottom shell (1) into multiple chambers, and the fuse (2) is disposed in the chamber.

7. The rail transit fuse device with fuse indication according to claim 6, characterized in that, The indicator bars include green indicator bars and red indicator bars.

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