A kind of locking mechanism of ring main unit

Abstract

The utility model discloses a kind of locking mechanism of ring main unit, the locking mechanism of this ring main unit includes frame, electromagnetic lock, baffle, tension spring, the frame is equipped with rotatable grounding switch operating lever, the baffle is horizontally movably arranged in the one side of the frame, the tension spring is arranged in the other side of the frame, and is connected with the baffle, for driving the baffle towards the grounding switch operating lever moves;The electromagnetic lock is connected with the baffle.By electromagnetic lock power failure when tension spring drives baffle and inserts grounding switch operating lever, forced locking is realized, effectively prevent high voltage when miscombination grounding switch;Electromagnetic lock is powered on and drives baffle to remove locking, allow normal operation, locking state does not depend on continuous power, safe and reliable, the mechanism has manual emergency unlocking function, when strict condition is satisfied, it can be mechanically unlocked, give consideration to safety, reliability and emergency operation convenience.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, and in particular to a locking mechanism for a ring main unit. Background Technology

[0002] Ring main units (RMMs) are widely used in power systems. Due to the inherent structural design of RMMs, accidents involving the closing of grounding switches while energized occur frequently. Therefore, when RMMs are used as power supply inputs, the grounding switches need to be equipped with reliable and comprehensive interlocking mechanisms to prevent misoperation and ensure the safe operation of the distribution network.

[0003] Existing grounding switch interlocking mechanisms mainly employ two technical approaches: mechanical interlocking and electrical interlocking. Mechanical interlocking devices achieve operational restrictions through physical structures. Their design relies on the coordinated operation of multiple components, resulting in complex structures, numerous transmission links, and susceptibility to mechanical wear, jamming, or failure after long-term operation. Furthermore, they have high maintenance costs. Electrical interlocking devices achieve interlocking functions through electromagnets and electrical control circuits. However, their performance is susceptible to electromagnetic interference, power fluctuations, or poor contact of auxiliary contacts, posing a potential reliability risk in complex electromagnetic environments.

[0004] Therefore, the applicant has made beneficial designs and found a way to solve the above problems. The technical solution to be introduced below is generated in this context. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the traditional locking mechanism design of ring main units and to provide a product with good reliability, simple structure, and reduced failure rate.

[0006] A locking mechanism for a ring main unit includes a frame, an electromagnetic lock, a baffle, and a tension spring. The frame is equipped with a rotatable grounding switch operating rod. The baffle is horizontally movable on one side of the frame. The tension spring is located on the other side of the frame and connected to the baffle, used to drive the baffle to move towards the grounding switch operating rod. The electromagnetic lock is connected to the baffle and is used to drive the baffle away from the grounding switch operating rod when energized, overcoming the force of the tension spring. When de-energized, the baffle is inserted into the grounding switch operating rod under the action of the tension spring to achieve locking.

[0007] Preferably, the frame has a limiting structure at a position adjacent to the grounding switch operating rod.

[0008] Preferably, the baffle is provided with a limiting hole that cooperates with the limiting structure.

[0009] Preferably, the frame is provided with a first connecting portion for mounting the tension spring.

[0010] Preferably, the electromagnetic lock includes a horizontally movable drive rod connected to the baffle, and the electromagnetic lock also includes an operating lever for manually controlling the drive rod.

[0011] Preferably, the baffle is provided with a second connecting part for connecting with the tension spring, and the baffle is also provided with a locking part for inserting the grounding switch operating rod.

[0012] Preferably, the grounding switch operating rod is provided with an operating hole, and the side of the operating hole is provided with a clearance hole for the locking part to be inserted. Beneficial effects

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes a spring-driven baffle to insert into the grounding switch operating rod when the electromagnetic lock is de-energized, achieving forced locking and effectively preventing accidental closing of the grounding switch when high voltage is present. When the electromagnetic lock is energized, it drives the baffle to release the lock, allowing normal operation. The locked state does not rely on continuous power, ensuring safety and reliability. The mechanism has a manual emergency unlocking function and can be mechanically unlocked under strict conditions, balancing safety, reliability, and emergency operation convenience. The baffle is built into the operating hole, providing resistance to external prying and forced insertion, significantly enhancing the reliability and anti-vandalism performance of the lock. The overall structure is simplified with fewer components, reducing mechanical wear and potential failure points. It operates stably and reliably with low maintenance requirements. The structure is highly adaptable to the environment, possesses good anti-interference capabilities, and maintains efficient locking functionality even under complex operating conditions, fundamentally improving equipment operational safety. Attached Figure Description

[0014] Figure 1 This is a front view of the locking mechanism of a ring main unit of this utility model when it is not locked. Figure 2 This is a front view of the locking mechanism of a ring main unit according to the present invention when it is locked. The correspondence between the labels and component names in the attached figures is as follows: Reference numerals: 1. Frame; 2. Electromagnetic lock; 3. Baffle; 4. Tension spring; 5. Grounding switch operating rod; 11. Limiting structure; 12. First connecting part; 21. Drive rod; 22. Operating block; 31. Limiting hole; 32. Locking part; 33. Second connecting part; 51. Operating hole. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0018] Reference example Figure 1 , Figure 2 A locking mechanism for a ring main unit includes a frame 1, an electromagnetic lock 2, a baffle 3, and a tension spring 4. The frame 1 is equipped with a rotatable grounding switch operating rod 5. The baffle 3 is horizontally movable on one side of the frame 1, and the tension spring 4 is located on the other side of the frame 1 and connected to the baffle 3, used to drive the baffle 3 to move toward the grounding switch operating rod 5. The electromagnetic lock 2 is connected to the baffle 3 and is used to drive the baffle 3 away from the grounding switch operating rod 5 when energized, overcoming the force of the tension spring 4. When the electromagnetic lock 2 is de-energized, the baffle 3 is inserted into the grounding switch operating rod 5 under the action of the tension spring 4 to achieve locking. When the electromagnetic lock 2 is de-energized, the tension spring 4 drives the baffle 3 to insert into the grounding switch operating rod 5, achieving forced locking and effectively preventing accidental closing of the grounding switch when the high voltage is energized. When the electromagnetic lock 2 is energized, it drives the baffle 3 to release the lock, allowing normal operation. The locked state does not rely on continuous power, ensuring safety and reliability. The mechanism has a manual emergency unlocking function and can be mechanically unlocked under strict conditions, balancing safety, reliability, and emergency operation convenience. The baffle 3 is built into the operating hole 51, providing resistance to external prying and forced insertion, significantly enhancing the reliability and anti-vandalism performance of the lock. The overall structure is simplified with fewer components, reducing mechanical wear and failure points. The operation is stable and reliable with low maintenance requirements. The structure is highly adaptable to the environment and has good anti-interference capabilities, maintaining efficient locking function even under complex working conditions, fundamentally improving the safety of equipment operation. It is worth mentioning that the frame 1 is provided with a limiting structure 11 near the grounding switch operating rod 5. The limiting structure 11 is used to precisely guide the movement direction of the baffle 3 and prevent the baffle 3 from deviating or shaking during the movement, thereby ensuring the accuracy and stability of the locking action. The shape of the limiting structure 11 can be circular. It is worth mentioning that the baffle 3 is provided with a limiting hole 31 that cooperates with the limiting structure 11. The limiting hole 31 on the baffle 3 and the limiting structure 11 form a precise fit, realizing the precise guidance and positioning of the baffle 3 in the horizontal direction, ensuring that the baffle 3 can be accurately inserted into the operating hole 51 every time it moves, improving the repeatability of the locking action and the overall life of the mechanism. It is worth mentioning that the frame 1 is provided with a first connecting part 12 for mounting the tension spring 4. The first connecting part 12 provides a fixed mounting point for the tension spring 4, so that the tension of the tension spring 4 can be stably applied to the baffle 3. It is worth mentioning that the electromagnetic lock 2 includes a horizontally movable drive rod 21, which is connected to the baffle 3. The electromagnetic lock 2 also has an operating lever 22 for manually controlling the drive rod 21. The electromagnetic lock is usually used in conjunction with the live indicator of the ring main unit. When the live indicator detects high voltage inside the cabinet, it forcibly locks the electromagnetic lock 2, preventing it from being energized. At this time, the tension spring 4 drives the baffle 3 to insert the locking part 32 into the operating hole 51, realizing the locking function. When the equipment is in a power-off maintenance state, the electromagnetic lock 2 is energized, and the drive baffle 3 overcomes the force of the tension spring 4 and causes the locking part 32 to disengage from the operating hole 51. The hole 51 is opened to release the lock and allow the operating handle to be inserted. The manual emergency unlocking mechanism is activated only when the following conditions are met: first, the high-voltage side is confirmed to be de-energized; second, the secondary circuit is de-energized. At this time, the driving rod 21 can be controlled by operating the toggle block 22 to move the locking part 32 away from the operating hole 51, thereby achieving mechanical unlocking. This design ensures the reliability of the live lock while taking into account the needs of emergency operation, improving the adaptability and safety of the system under extreme conditions. In addition, this linkage mechanism effectively avoids the risk of misoperation caused by human error or power failure, and strengthens the overall protection level of the ring main unit.

[0019] It is worth mentioning that the baffle 3 is provided with a second connecting part 33 for connecting with the tension spring 4, and the baffle 3 is also provided with a locking part 32 for inserting the grounding switch operating rod 5. The second connecting part 33 optimizes the connection method between the tension spring 4 and the baffle 3, ensuring efficient and stable transmission of tension. The locking part 32 acts directly on the operating hole 51, forming a physical block to prevent misoperation. It is worth mentioning that the grounding switch operating rod 5 is provided with an operating hole 51. The side of the operating hole 51 is provided with a clearance hole for the locking part 32 to be inserted. The matching design of the operating hole 51 and the clearance hole enables the locking part 32 to be accurately inserted and form an effective lock, while avoiding interference with the normal rotation of the operating rod.

[0020] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A locking mechanism for a ring main unit, characterized in that: The device includes a frame (1), an electromagnetic lock (2), a baffle (3), and a tension spring (4). The frame (1) is equipped with a rotatable grounding switch operating rod (5). The baffle (3) is horizontally movable on one side of the frame (1), and the tension spring (4) is located on the other side of the frame (1) and connected to the baffle (3) to drive the baffle (3) to move toward the grounding switch operating rod (5). The electromagnetic lock (2) is connected to the baffle (3) and is used to drive the baffle (3) to overcome the force of the tension spring (4) and move away from the grounding switch operating rod (5) when energized. When the electromagnetic lock (2) is de-energized, the baffle (3) is inserted into the grounding switch operating rod (5) under the action of the tension spring (4) to achieve locking.

2. The locking mechanism of the ring main unit according to claim 1, characterized in that: The frame (1) has a limiting structure (11) located near the grounding switch operating rod (5).

3. The locking mechanism of the ring main unit according to claim 2, characterized in that: The baffle (3) is provided with a limiting hole (31) that cooperates with the limiting structure (11).

4. The locking mechanism of the ring main unit according to claim 1, characterized in that: The frame (1) is provided with a first connecting part (12) for mounting the tension spring (4).

5. The locking mechanism of the ring main unit according to claim 1, characterized in that: The electromagnetic lock (2) includes a horizontally movable drive rod (21), which is connected to the baffle (3). The electromagnetic lock (2) is also provided with an operation lever (22) for manually controlling the drive rod (21).

6. The locking mechanism of the ring main unit according to claim 1, characterized in that: The baffle (3) is provided with a second connecting part (33) for connecting with the tension spring (4), and the baffle (3) is also provided with a locking part (32) for inserting the grounding switch operating rod (5).

7. The locking mechanism of the ring main unit according to claim 6, characterized in that: The grounding switch operating rod (5) is provided with an operating hole (51), and the side of the operating hole (51) is provided with a clearance hole for the locking part (32) to be inserted.

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