A quick circuit breaker suitable for rail transit traction system

Abstract

The utility model relates to rail transit electrical equipment technical field discloses a kind of quick circuit breaker suitable for rail transit traction system, including the first shell and second shell for protection, the second shell is fixedly installed on the first shell upper end, the first shell upper end is equipped with the on-off protection element for responsible circuit, the first shell upper end one side is equipped with arc chamber for preventing arc reignition, the first shell upper end one side is equipped with the limiting assembly for limiting fixed arc chamber. The utility model is positioned quickly by being placed between two vertical plate and being inserted into slot by limiting plate, and the horizontal rod part is rigidly abutted on the upper end of arc chamber by the cooperation of clamping block and clamping groove, and the fixing mode is portable and stable, then vertical pressure is formed by rotating knob driving threaded rod to drive pressing plate to press down arc chamber, and pressing plate and limiting plate constitute double fixing structure, while maintaining the convenience of installation, significantly enhance the working reliability of arc chamber.

Description

Technical Field

[0001] This utility model relates to the field of rail transit electrical equipment technology, specifically to a fast circuit breaker suitable for rail transit traction systems. Background Technology

[0002] The rail transit traction system is the core power system that drives trains with electricity. It provides 1500V-3000V DC or 25kV AC high voltage to the train through the overhead contact line or third rail. As a key protection device of the system, the fast circuit breaker needs to cut off tens of thousands of amperes of fault current within 5-10 milliseconds when a short circuit fault occurs. Its operating speed and reliability are directly related to train safety. The arc-extinguishing chamber is the core component of the circuit breaker. It contains an arc-extinguishing grid made of metal grid plates or ceramic partitions. It achieves current interruption by stretching, cooling and dividing the arc. Due to long-term exposure to arc erosion, the arc-extinguishing chamber needs to be inspected and replaced regularly.

[0003] Existing circuit breaker arc-extinguishing chambers are typically fixed with bolts or sealed with epoxy resin. Bolt fixing requires specialized tools for repeated disassembly and reassembly, and in the space-constrained electrical cabinet, thread corrosion or stripped bolts can easily lead to disassembly difficulties, potentially damaging surrounding components. While epoxy resin sealing improves airtightness, the cured material is hard and brittle, requiring heating or mechanical crushing for removal during maintenance. This process easily generates dust pollution and damages insulation components, making maintenance cumbersome, extending overall operation time, and affecting the efficiency of electrical equipment maintenance. Therefore, those skilled in the art provide a fast circuit breaker suitable for rail transit traction systems to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a fast circuit breaker suitable for rail transit traction systems, thereby solving the problems mentioned in the background section of the prior art.

[0005] This utility model provides the following technical solution: a fast circuit breaker suitable for rail transit traction systems, comprising a first housing and a second housing for protection, the second housing being fixedly installed on the upper end of the first housing, a circuit-breaking protection element being installed on the upper end of the first housing, an arc-extinguishing chamber being installed on one side of the upper end of the first housing to prevent arc reignition, a limiting component being installed on one side of the upper end of the first housing to limit and fix the arc-extinguishing chamber, and a pressing component being installed inside the limiting component to pressurize and fix the arc-extinguishing chamber.

[0006] As a preferred embodiment of the above technical solution, the limiting component includes two upright plates. Both upright plates are fixedly connected to one side of the upper end of the first housing and are symmetrically arranged on both sides of the arc extinguishing chamber. Each of the two upright plates has a slot at its upper end, and a limiting plate is provided in both slots. The limiting plate includes two vertical rods and one horizontal rod. Each of the two vertical rods of the limiting plate is provided with a snap-fit ​​component, and the two snap-fit ​​components are symmetrically arranged.

[0007] As a preferred embodiment of the above technical solution, the snap-fit ​​assembly includes two sliding cavities symmetrically arranged within the limiting plate. A set of springs is fixedly connected to the inner wall of each sliding cavity, and a locking block is fixedly connected to the front end of each set of springs. The two locking blocks are slidably connected within the two sliding cavities, and the front ends of the two locking blocks are wedge-shaped. Two symmetrically arranged slots are formed on the inner wall of the slot. The front ends of the two locking blocks penetrate one side of the inner wall of each of the two sliding cavities, and the front ends of the two locking blocks engage with the two slots. A sliding opening is formed at the top of the inner wall of each of the two sliding cavities, and a toggle block is slidably connected within each sliding opening. One end of each toggle block is fixedly connected to the upper end of the two locking blocks.

[0008] As a preferred embodiment of the above technical solution, the pressing assembly includes a placement groove, which is located at the middle of the lower end of the horizontal bar of the limiting plate. A threaded rod is threadedly fitted at the middle of the horizontal bar of the limiting plate. A pressing plate is rotatably connected to the lower end of the threaded rod. The pressing plate is slidably connected in the placement groove. A knob is fixedly connected to the upper end of the threaded rod.

[0009] As a preferred embodiment of the above technical solution, the inner wall of the placement groove has two symmetrically arranged guide grooves, and guide blocks are fixedly connected to both sides of the pressing plate, with the two guide blocks slidably connected in the two guide grooves respectively.

[0010] As a preferred embodiment of the above technical solution, two limiting blocks are fixedly connected to the upper end of the first housing, and the two limiting blocks are symmetrically arranged on both sides of the arc extinguishing chamber.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By placing the arc-extinguishing chamber between two upright plates and then inserting the limiting plate into the slot, the limiting plate is quickly fixed in the slot by the cooperation of the locking block and the slot. The lower end of the horizontal bar of the limiting plate abuts against the upper end of the arc-extinguishing chamber, thereby achieving rapid positioning and stable constraint of the arc-extinguishing chamber. The arc-extinguishing chamber can be locked by inserting the limiting plate, which avoids the cumbersome operation of traditional bolt fixing and forms a rigid limit through the direct contact between the horizontal bar of the limiting plate and the arc-extinguishing chamber. This significantly improves maintenance efficiency while ensuring reliable arc extinguishing.

[0013] 2. After the limiting plate is inserted, the user can operate the knob to rotate the threaded rod, which will allow the pressing plate to slide downward in the placement groove. This will cause the lower end of the pressing plate to press against the upper end of the arc-extinguishing chamber and apply vertical downward pressure, further pressing and fixing the arc-extinguishing chamber. This achieves double fixing of the arc-extinguishing chamber, ensuring both convenient installation and improved reliability of the arc-extinguishing chamber. Attached Figure Description

[0014] Figure 1 A schematic diagram of the main structure of a fast circuit breaker suitable for rail transit traction systems;

[0015] Figure 2 A schematic diagram of the on / off protection element of a fast circuit breaker suitable for rail transit traction systems;

[0016] Figure 3 An exploded view of the main structure of a fast circuit breaker suitable for rail transit traction systems;

[0017] Figure 4 A schematic diagram of a limit assembly structure for a fast circuit breaker suitable for rail transit traction systems;

[0018] Figure 5 This is a schematic diagram of the pressing assembly structure of a fast circuit breaker suitable for rail transit traction systems.

[0019] Legend:

[0020] 1. First housing; 2. Second housing; 3. On / off protection element; 4. Arc extinguishing chamber; 5. Limiting assembly; 501. Vertical plate; 502. Slot; 503. Limiting plate; 504. Sliding cavity; 505. Spring; 506. Locking block; 507. Locking groove; 508. Sliding opening; 509. Toggle block; 6. Pressing assembly; 601. Placement groove; 602. Threaded rod; 603. Pressing plate; 604. Knob; 7. Guide groove; 8. Guide block; 9. Limiting block. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] Please see Figures 1-5As shown, this utility model provides a technical solution: a fast circuit breaker suitable for rail transit traction systems, including a first housing 1 and a second housing 2 for protection, the second housing 2 being fixedly installed on the upper end of the first housing 1, a circuit breaking protection element 3 for controlling the circuit being installed on the upper end of the first housing 1, an arc-extinguishing chamber 4 for preventing arc reignition being installed on one side of the upper end of the first housing 1, a limiting component 5 for limiting and fixing the arc-extinguishing chamber 4 being installed on one side of the upper end of the first housing 1, and a pressing component 6 for pressurizing and fixing the arc-extinguishing chamber 4 being installed inside the limiting component 5.

[0023] As one implementation method in this embodiment, please refer to Figures 2-4 As shown, the limiting component 5 includes two upright plates 501. Both upright plates 501 are fixedly connected to one side of the upper end of the first housing 1, and the two upright plates 501 are symmetrically arranged on both sides of the arc extinguishing chamber 4. Each of the two upright plates 501 has a slot 502 at its upper end. A limiting plate 503 is provided in both slots 502. The limiting plate 503 includes two vertical rods and one horizontal rod. Each of the two vertical rods of the limiting plate 503 is provided with a snap-fit ​​component, and the two snap-fit ​​components are symmetrically arranged.

[0024] The snap-fit ​​assembly includes two sliding cavities 504, which are symmetrically located within the limiting plate 503. A set of springs 505 is fixedly connected to the inner wall of each sliding cavity 504. A locking block 506 is fixedly connected to the front end of each set of springs 505. The two locking blocks 506 are slidably connected within the two sliding cavities 504, and their front ends are wedge-shaped. Two symmetrically arranged slots 507 are provided on the inner wall of the slot 502. The front ends of the two locking blocks 506 penetrate one side of the inner wall of each sliding cavity 504 and engage with the two slots 507. A sliding opening 508 is provided at the top of the inner wall of each sliding cavity 504, and an actuating block 509 is slidably connected within each sliding opening 508. One end of each actuating block 509 is fixedly connected to the upper end of each locking block 506.

[0025] Furthermore, during the installation of the arc-extinguishing chamber 4, it is placed between the two vertical plates 501. Then, the two vertical rods of the limiting plate 503 are inserted into the slots 502 of the vertical plates 501. The inclined surface of the wedge-shaped front end of the locking block 506 contacts the upper end of the vertical plate 501, thus decomposing the force and causing the locking block 506 to be pushed. The spring 505 contracts, temporarily retracting the front end of the locking block 506 into the sliding cavity 504. When the slot 507 inside the slot 502 is aligned with the locking block 506, the spring 505 returns to its original position, pushing the front end of the locking block 506 into the slot 507, thereby limiting the position of the limiting plate 503. The lower end of the crossbar of the limiting plate 503 abuts against the upper end of the arc-extinguishing chamber 4, thereby achieving rapid positioning and stable constraint of the arc-extinguishing chamber 4. The arc-extinguishing chamber 4 can be locked by inserting the limiting plate 503, which avoids the cumbersome operation of traditional bolt fixing. The direct contact between the crossbar of the limiting plate 503 and the arc-extinguishing chamber 4 forms a rigid limit, which significantly improves maintenance efficiency while ensuring reliable arc extinguishing. When it is necessary to remove the limiting plate 503, pinching the actuating blocks 509 on both sides will drive the locking blocks 506 to move closer to each other, so that the front end of the locking block 506 moves out of the locking groove 507. At this time, the limiting plate 503 can be lifted.

[0026] It is worth noting that both the on / off protection element 3 and the arc-extinguishing chamber 4 are existing technologies. The on / off protection element 3 achieves overload and short-circuit protection by inducing short-circuit current through an electromagnetic coil, triggering a mechanical mechanism to cut off the circuit. The arc-extinguishing chamber 4 is composed of contacts, a ceramic shield, and multiple arc-extinguishing grids. It utilizes vacuum insulation to rapidly diffuse arc metal vapor or divide and cool the arc, achieving reliable arc extinguishing when the current crosses zero. The two work together to ensure safe circuit disconnection, which will not be elaborated further here.

[0027] As one implementation method in this embodiment, please refer to Figure 2 , Figure 3 and Figure 5 As shown, the pressing component 6 includes a placement groove 601, which is opened at the middle of the lower end of the crossbar of the limiting plate 503. A threaded rod 602 is threadedly sleeved at the middle of the crossbar of the limiting plate 503. The lower end of the threaded rod 602 is rotatably connected to a pressing plate 603, which is slidably connected in the placement groove 601. A knob 604 is fixedly connected to the upper end of the threaded rod 602.

[0028] Furthermore, after the limiting plate 503 is inserted, the user operates the knob 604, and the threaded rod 602 rotates. The threaded rod 602 and the external limiting plate 503 are threadedly connected. Since the limiting plate 503 is already fixed, rotating the knob 604 will allow the pressing plate 603 to slide downward in the placement groove 601, thereby causing the lower end of the pressing plate 603 to press against the upper end of the arc-extinguishing chamber 4 and apply vertical downward pressure, further pressing and fixing the arc-extinguishing chamber 4, achieving double fixing of the arc-extinguishing chamber 4, which not only ensures the convenience of installation but also improves the reliability of the arc-extinguishing chamber 4.

[0029] As one implementation method in this embodiment, please refer to Figure 5 As shown, two symmetrically arranged guide grooves 7 are provided on the inner wall of the placement groove 601, and guide blocks 8 are fixedly connected to both sides of the pressing plate 603. The two guide blocks 8 are slidably connected in the two guide grooves 7 respectively.

[0030] Furthermore, since the lower end of the threaded rod 602 is rotatably connected to the pressing plate 603, the pressing plate 603 may rotate when the threaded rod 602 rotates, and the guide groove 7 and the guide block 8 can limit the pressing plate 603, so that the pressing plate 603 can move up and down stably.

[0031] As one implementation method in this embodiment, please refer to Figure 3 As shown, two limiting blocks 9 are fixedly connected to the upper end of the first housing 1, and the two limiting blocks 9 are symmetrically arranged on both sides of the arc extinguishing chamber 4.

[0032] Furthermore, two limiting blocks 9, together with two upright plates 501, are distributed around the arc-extinguishing chamber 4 to limit the arc-extinguishing chamber 4 and prevent the arc-extinguishing chamber 4 from moving when the device vibrates.

[0033] Working principle: When installing the arc-extinguishing chamber 4, place it between two vertical plates 501. Then, insert the two vertical rods of the limiting plate 503 into the slots 502 of the vertical plates 501. The inclined surface of the wedge-shaped front end of the locking block 506 will contact the upper end of the vertical plate 501, thereby decomposing the force and causing the locking block 506 to be pushed. The spring 505 contracts, which temporarily retracts the front end of the locking block 506 into the sliding cavity 504. When the slot 507 inside the slot 502 is aligned with the locking block 506, the spring 505 returns to its original position, pushing the front end of the locking block 506 into the slot 507, thereby limiting the position of the limiting plate 503. The lower end of the horizontal rod of the limiting plate 503 abuts against the upper end of the arc-extinguishing chamber 4, thereby achieving rapid positioning and stable constraint of the arc-extinguishing chamber 4, allowing the arc-extinguishing chamber 4 to pass through the limiting position. The insertion of plate 503 completes the locking process, avoiding the cumbersome operation of traditional bolt fixing. The direct contact between the crossbar of the limiting plate 503 and the arc-extinguishing chamber 4 creates a rigid limit, significantly improving maintenance efficiency while ensuring reliable arc extinguishing. After the limiting plate 503 is inserted, the user operates knob 604, causing the threaded rod 602 to rotate. The threaded rod 602 and the external limiting plate 503 are threadedly connected. Since the limiting plate 503 is already fixed, rotating knob 604 allows the pressing plate 603 to slide downwards within the placement slot 601. This causes the lower end of the pressing plate 603 to press against the upper end of the arc-extinguishing chamber 4, applying vertical downward pressure and further pressing and fixing the arc-extinguishing chamber 4. This achieves double fixing of the arc-extinguishing chamber 4, ensuring both ease of installation and improved reliability.

[0034] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A fast circuit breaker suitable for rail transit traction systems, comprising a first housing (1) and a second housing (2) for protection, characterized in that: The second housing (2) is fixedly installed on the upper end of the first housing (1). The upper end of the first housing (1) is equipped with a circuit-connecting protection element (3). An arc-extinguishing chamber (4) for preventing arc reignition is installed on one side of the upper end of the first housing (1). A limiting component (5) for limiting and fixing the arc-extinguishing chamber (4) is installed on one side of the upper end of the first housing (1). A pressing component (6) for pressurizing and fixing the arc-extinguishing chamber (4) is installed inside the limiting component (5).

2. A fast circuit breaker suitable for rail transit traction systems according to claim 1, characterized in that: The limiting component (5) includes two upright plates (501). Both upright plates (501) are fixedly connected to one side of the upper end of the first housing (1), and the two upright plates (501) are symmetrically arranged on both sides of the arc extinguishing chamber (4). The upper end of each of the two upright plates (501) is provided with a slot (502). The two slots (502) are provided with a limiting plate (503). The limiting plate (503) includes two vertical rods and one horizontal rod. The two vertical rods of the limiting plate (503) are provided with a snap-fit ​​component, and the two snap-fit ​​components are symmetrically arranged.

3. A fast circuit breaker suitable for rail transit traction systems according to claim 2, characterized in that: The snap-fit ​​assembly includes two sliding cavities (504), which are symmetrically arranged within the limiting plate (503). A set of springs (505) is fixedly connected to the inner wall of each sliding cavity (504). A locking block (506) is fixedly connected to the front end of each set of springs (505). The two locking blocks (506) are slidably connected within the two sliding cavities (504), and the front ends of the two locking blocks (506) are wedge-shaped. The slot (502) The inner wall of the sliding cavity (504) has two symmetrically arranged slots (507). The front ends of the two locking blocks (506) penetrate the inner wall of one side of the two sliding cavities (504) respectively, and the front ends of the two locking blocks (506) are engaged with the two slots (507) respectively. The top of the inner wall of the two sliding cavities (504) is provided with a sliding opening (508). A toggle block (509) is slidably connected in the two sliding openings (508). One end of the two toggle blocks (509) is fixedly connected to the upper end of the two locking blocks (506) respectively.

4. A fast circuit breaker suitable for rail transit traction systems according to claim 1, characterized in that: The pressing assembly (6) includes a placement groove (601), which is located at the middle of the lower end of the crossbar of the limiting plate (503). A threaded rod (602) is threadedly fitted at the middle of the crossbar of the limiting plate (503). A pressing plate (603) is rotatably connected to the lower end of the threaded rod (602). The pressing plate (603) is slidably connected in the placement groove (601). A knob (604) is fixedly connected to the upper end of the threaded rod (602).

5. A fast circuit breaker suitable for rail transit traction systems according to claim 4, characterized in that: The inner wall of the placement groove (601) has two symmetrically arranged guide grooves (7), and guide blocks (8) are fixedly connected to both sides of the pressing plate (603). The two guide blocks (8) are slidably connected in the two guide grooves (7).

6. A fast circuit breaker suitable for rail transit traction systems according to claim 1, characterized in that: Two limiting blocks (9) are fixedly connected to the upper end of the first housing (1), and the two limiting blocks (9) are symmetrically arranged on both sides of the arc extinguishing chamber (4).

Images