Solid insulation ring main unit operating mechanism

Abstract

This utility model provides an operating mechanism for a solid-insulated ring main unit, including an operating lever connected to an operating transmission shaft. Above the lever are a tripping linkage and a closing linkage, with the crank arm of the linkage cooperating with a tripping locking mechanism. The tripping lever of the tripping locking mechanism works in conjunction with the locking lever, and the tripping lever is pushed by a cam and connected to an electromagnetic tripping coil. The operating transmission shaft of this utility model is equipped with a limit block to restrict the rotation angle. This utility model also has an interlocking function where the interlocking lever cooperates with the grounding switch operating shaft and a mechanical locking pin, and has a transmission shaft sleeve and a buffer pad on the side. Furthermore, a linkage plate is connected to a slider, which slides within a guide groove. The operating mechanism is protected by a protective cover. This utility model's operating mechanism is convenient to operate, reliable in tripping, and has electrical protection and interlocking functions, effectively ensuring the safe and stable operation of the ring main unit.

Description

Technical Field

[0001] This utility model relates to the field of solid-insulated ring main units, and more specifically, to an operating mechanism for solid-insulated ring main units. Background Technology

[0002] Solid-insulated ring main units (RMMs) are switchgear whose conductive circuits and arc-extinguishing chambers of high-voltage switchgear are encased and sealed with solid insulating materials. In power systems, solid-insulated RMMs are widely used in distribution networks due to their compact structure and excellent insulation performance. However, traditional solid-insulated RMM operating mechanisms have some significant drawbacks in practical applications:

[0003] Firstly, existing operating mechanisms lack an effective connection between the trip lever and the electromagnetic trip coil. When overcurrent or short-circuit faults occur in the electrical circuit, the trip lever cannot be driven in time to automatically disconnect the circuit, making it difficult to quickly cut off the faulty circuit and increasing the risk of equipment damage and accident escalation. Secondly, the operating transmission shaft often lacks limit blocks and positioning pins, making it impossible to accurately limit the rotation angle. This leads to over-rotation or under-rotation during opening and closing operations, resulting in frequent operational errors and seriously affecting the normal operation of the equipment.

[0004] The existing operating mechanism's linkage plate, slider, and guide groove are difficult to coordinate precisely during opening and closing operations, resulting in inaccurate force transmission and affecting the overall performance and reliability of the operating mechanism. Furthermore, the coordination between the interlocking rod, the grounding switch operating shaft, and the mechanical locking pin cannot effectively prevent accidental operation of the grounding switch when the switch is closed, or accidental closing of the switch when the grounding switch is closed, posing a significant safety hazard.

[0005] The existing operating drive shaft lacks a drive shaft sleeve and buffer pad on its side, making it unable to effectively absorb the impact force generated during operation. This easily causes mechanical damage to the operating mechanism components and reduces the service life of the equipment. Therefore, we have made improvements and proposed a solid-insulated ring main unit operating mechanism. Utility Model Content

[0006] The purpose of this utility model is to address the problems raised in the existing background technology. To achieve the above-mentioned purpose, this utility model provides the following technical solution: a solid-insulated ring main unit operating mechanism, including an operating lever, the operating lever being connected to an operating transmission shaft, a tripping link and a closing link being provided above the operating transmission shaft, both the tripping link and the closing link being provided with a crank arm, the end of the crank arm cooperating with a tripping locking mechanism.

[0007] As a preferred technical solution of this utility model, the release locking mechanism is provided with a release rod, the release rod and the locking rod cooperate with each other, the release rod is in the position driven by the cam, and the cam is mounted on the operating transmission shaft.

[0008] As a preferred technical solution of this utility model, the tripping rod is connected to the electromagnetic tripping coil, and the electromagnetic tripping coil is connected to the electrical circuit through the wiring terminal.

[0009] As a preferred technical solution of this utility model, the operating transmission shaft is provided with a limiting block that restricts the rotation angle position.

[0010] As a preferred technical solution of this utility model, it also includes an interlocking rod, which is configured to cooperate with the grounding knife operating shaft and the mechanical locking pin, and the mechanical locking pin is provided on the side of the grounding knife operating shaft.

[0011] As a preferred technical solution of this utility model, the side of the operating transmission shaft sleeve is provided with a buffer pad.

[0012] As a preferred technical solution of this utility model, it also includes a linkage plate, which is connected to the slider, and the slider is installed in the guide groove.

[0013] As a preferred technical solution of this utility model, the end of the limiting block is provided with a positioning pin.

[0014] As a preferred technical solution of this utility model, the operating mechanism is provided with a protective cover.

[0015] Compared with existing technologies, the advantages of this utility model are as follows: Through the connection design between the operating lever and the operating transmission shaft, operators can easily perform manual opening and closing operations. The simple and direct mechanical connection method ensures accurate and timely transmission of operating actions, reducing operational difficulty and improving operational efficiency. The cooperation between the crank arms on the opening and closing linkages and the tripping and locking mechanisms, as well as the mutual coordination between the tripping rod and the locking rod, ensures the stability and reliability of the opening and closing operations. It can firmly lock and maintain the closed state when closing; it can quickly unlock when opening, achieving rapid opening and effectively avoiding misoperation and abnormal tripping.

[0016] The trip lever is connected to the electromagnetic trip coil. When an overcurrent or short-circuit fault occurs in the electrical circuit, the electromagnetic trip coil can respond promptly, driving the trip lever to automatically trip the circuit breaker. This automatic protection function greatly improves the safety of the ring main unit, enabling it to quickly disconnect faulty circuits and reduce the risk of equipment damage and escalation of accidents.

[0017] The limit blocks and locating pins at the ends of the operating transmission shaft precisely limit the rotation angle of the shaft. This ensures that opening and closing operations can only be performed within the specified angle range, guaranteeing operational accuracy and consistency, and preventing operational errors and equipment malfunctions caused by excessive or insufficient rotation.

[0018] The coordination between the linkage plate, the slider, and the guide groove enables precise linkage actions of the relevant components during the opening and closing operations. The sliding of the slider within the guide groove accurately transmits operating force and achieves specific functions, further improving the overall performance and reliability of the operating mechanism.

[0019] The interlocking rod, the grounding switch operating shaft, and the mechanical locking pin work together to achieve interlocking and locking functions between different operations. When the switch is in the closed state, it can prevent accidental operation of the grounding switch; when the grounding switch is closed, it can also restrict the closing operation of the switch, effectively avoiding safety accidents caused by misoperation and ensuring the safety of operators and equipment.

[0020] The drive shaft sleeve and buffer shims on the side of the operating drive shaft play an important role in cushioning during operation. The buffer shims can absorb the impact force generated during operation, reduce mechanical damage to the operating mechanism components, lower the equipment failure rate, and also improve the smoothness and comfort of operation. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the present invention;

[0022] Figure 2 This is a partial structural diagram of the interlocking rod provided by this utility model;

[0023] Figure 3 This is a partial structural diagram of the slider provided by this utility model;

[0024] Figure 4 This is a partial structural diagram of the wiring terminal provided by this utility model;

[0025] Figure 5 This is a partial structural diagram of the transmission shaft sleeve provided by this utility model.

[0026] The image shows:

[0027] 1. Operating lever; 2. Opening linkage; 3. Closing linkage; 4. Operating transmission shaft; 5. Crank arm; 6. Tripping lever; 7. Locking lever; 8. Cam; 9. Limit block; 10. Interlocking rod; 11. Grounding switch operating shaft; 12. Mechanical locking pin; 13. Transmission shaft sleeve; 14. Buffer pad; 15. Linkage plate; 16. Slider; 17. Electromagnetic trip coil; 18. Guide groove; 19. Positioning pin; 20. Terminal block; 21. Protective cover. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0029] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely illustrates some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model. It should be noted that, in the absence of conflict, the embodiments and features and technical solutions in the embodiments of this utility model can be combined with each other. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] Example 1: An operating mechanism for a solid-insulated ring main unit includes an operating lever 1 connected to an operating transmission shaft 4. A tripping linkage 2 and a closing linkage 3 are mounted above the operating transmission shaft 4. Both the tripping linkage 2 and the closing linkage 3 are equipped with crank arms 5, the ends of which cooperate with a tripping locking mechanism. The tripping locking mechanism includes a tripping rod 6, which cooperates with a locking rod 7. The tripping rod 6 is in a position pushed by a cam 8, which is mounted on the operating transmission shaft 4. The tripping rod 6 is connected to an electromagnetic tripping coil 17, which is connected to an electrical circuit via a terminal block 20.

[0031] A limiting block 9 is provided on the operating transmission shaft 4 to restrict the rotation angle position. An interlocking rod 10 is configured to cooperate with the grounding knife operating shaft 11 and the mechanical locking pin 12. The mechanical locking pin 12 is provided on the side of the grounding knife operating shaft 11. A transmission shaft sleeve 13 is provided on the side of the operating transmission shaft 4, and a buffer pad 14 is provided on the side of the transmission shaft sleeve 13. A linkage plate 15 is connected to a slider 16, and the slider 16 is installed in a guide groove 18. A positioning pin 19 is provided at the end of the limiting block 9. A protective cover 21 is provided on the outside of the operating mechanism.

[0032] Working principle of the solid insulated ring main unit operating mechanism: The operator operates the unit by means of the operating lever 1, which transmits the action to the operating transmission shaft 4, causing the operating transmission shaft 4 to rotate.

[0033] Opening and closing: The opening linkage 2 and closing linkage 3 above the operating drive shaft 4 have crank arms 5 that engage with the tripping and locking mechanism. When the operating drive shaft 4 rotates, it drives the cam 8 to rotate. The cam 8 pushes the tripping lever 6, which cooperates with the locking lever 7 to achieve the opening or closing operation. For example, during closing, the corresponding mechanical action locks the locking lever 7, maintaining the closed state; during opening, the tripping lever 6 unlocks the locking lever 7, achieving the opening.

[0034] Electromagnetic trip control: The trip lever 6 is connected to the electromagnetic trip coil 17, which is connected to the electrical circuit via terminal 20. When an abnormality occurs in the electrical circuit (such as overcurrent or short circuit fault), the electromagnetic trip coil 17 is energized to generate electromagnetic force, which drives the trip lever 6 to move, thereby unlocking the latch lever 7 and realizing automatic circuit breaker tripping, thus protecting the circuit.

[0035] Rotation angle limitation: The limiting block 9 on the operating transmission shaft 4 can limit its rotation angle position, ensuring that the operating transmission shaft 4 can only rotate within the specified angle range, avoiding excessive rotation that could cause damage to the mechanism or operational errors. The positioning pin 19 at the end of the limiting block 9 can further precisely determine its position.

[0036] Interlocking and Locking: The interlocking rod 10 is configured to cooperate with the grounding switch operating shaft 11 and the mechanical locking pin 12. During certain operations, the movement of the interlocking rod 10 restricts the operation of the grounding switch operating shaft 11, or activates the mechanical locking pin 12, achieving interlocking and locking between different operations to ensure the safety and correctness of the operation. For example, when the switch is in the closed state, the interlocking mechanism prevents accidental operation of the grounding switch.

[0037] Buffering and transmission: The transmission shaft sleeve 13 on the side of the transmission shaft 4 can realize the transmission function, while the buffer pad 14 on its side can play a buffering role during operation, reduce the impact force during operation, protect the mechanism components, and extend their service life.

[0038] Linkage action: The linkage plate 15 is connected to the slider 16, and the slider 16 is installed in the guide groove 18. When the operating mechanism is activated, the linkage plate 15 drives the slider 16 to slide in the guide groove 18, realizing the linkage of related components to complete a specific operation or function.

[0039] Protective function: The protective cover 21 installed on the outside of the operating mechanism can protect the internal components of the operating mechanism from the influence of external environmental factors, and at the same time prevent personnel from accidentally touching the operating mechanism, thereby improving the safety of operation.

[0040] Working process of the solid insulated ring main unit operating mechanism: Closing process: The operator holds the operating lever handle 1 and rotates it in the closing direction. The operating lever handle 1 drives the operating transmission shaft 4 connected to it to rotate synchronously.

[0041] Tripping and locking mechanism response: When the operating transmission shaft 4 rotates, the cam 8 mounted on it rotates accordingly. The cam 8 pushes the trip lever 6, and the trip lever 6 and the locking lever 7 cooperate to operate. During the closing process, the locking lever 7 will be in a locked state, keeping the operating mechanism in the closed position. At this time, the crank arms 5 on the opening linkage 2 and the closing linkage 3 also swing to the corresponding closing position as the operating transmission shaft 4 rotates.

[0042] The limit block 9 on the operating transmission shaft 4 restricts its rotation angle, ensuring that the operating transmission shaft 4 can only rotate to the specified closing angle position and avoiding excessive rotation. The positioning pin 19 at the end of the limit block 9 further precisely determines its position, ensuring the accuracy of the closing operation.

[0043] Interlocking and locking: During the closing operation, the interlocking rod 10 cooperates with the grounding switch operating shaft 11 and the mechanical locking pin 12. If the grounding switch is in the closed state, the mechanical locking pin 12 will restrict the rotation of the operating transmission shaft 4 to prevent accidental closing; only when the grounding switch is in the open state can the operating transmission shaft 4 rotate smoothly to complete the closing operation.

[0044] The transmission shaft sleeve 13 on the side of the operating transmission shaft 4 realizes the transmission function and ensures the effective transmission of operating force. At the same time, the buffer pad 14 plays a buffering role during operation, reducing the impact force generated during operation and protecting the components of the operating mechanism.

[0045] The linkage plate 15 is connected to the slider 16, which is installed in the guide groove 18. During the closing operation, the linkage plate 15 moves with the operation mechanism, causing the slider 16 to slide in the guide groove 18, thereby realizing the linkage of related components to complete other auxiliary actions required for closing.

[0046] Opening process: The operator holds the operating lever 1 and rotates it in the opening direction, which drives the operating transmission shaft 4 to rotate in the opposite direction.

[0047] The cam 8 on the operating transmission shaft 4 rotates in the reverse direction, pushing the trip lever 6 to actuate, changing the engagement relationship between the trip lever 6 and the locking lever 7, unlocking the locking lever 7, and thus opening the circuit breaker. The crank arms 5 on the opening linkage 2 and the closing linkage 3 also swing to the opening position.

[0048] The limit block 9 also limits the reverse rotation angle of the operating transmission shaft 4, so that it stops at the specified opening angle position, and the positioning pin 19 ensures the accuracy of the opening position.

[0049] The interlocking rod 10, the grounding switch operating shaft 11, and the mechanical locking pin 12 work together again to ensure that the operating conditions of the grounding switch meet safety requirements after the tripping operation is completed. For example, after the switch is tripped, the grounding switch can be closed, but certain mechanical interlocking conditions must be met.

[0050] The transmission shaft sleeve 13 continues to perform the transmission function, and the buffer pad 14 still plays a buffering role, ensuring the smoothness of the opening operation and the safety of the mechanism components.

[0051] The linkage plate 15 drives the slider 16 to slide in the opposite direction in the guide groove 18, completing the relevant linkage actions when the circuit breaker is opened.

[0052] Electromagnetic tripping process: When an overcurrent or short circuit fault occurs in the electrical circuit, the electrical circuit connected to the electromagnetic trip coil 17 detects an abnormal current or voltage signal through the terminal 20, and the electromagnetic trip coil 17 is energized.

[0053] Trip lever action: When the electromagnetic trip coil 17 is energized, it generates electromagnetic force, driving the trip lever 6 connected to it to actuate. The actuation of the trip lever 6 unlocks the locking lever 7, and the operating mechanism automatically trips the circuit breaker, cutting off the faulty circuit and protecting electrical equipment and lines. The subsequent angle limiting, interlocking, buffer transmission, and linkage component actions are similar to those of manual tripping.

[0054] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, the present utility model is not limited to the specific embodiments described above. Therefore, any modifications or substitutions to the present utility model, and all technical solutions and improvements that do not depart from the spirit and scope of the utility model, are covered within the scope of the claims of the present utility model.

Claims

1. A solid-insulated ring main unit operating mechanism, characterized in that, It includes an operating lever (1), which is connected to an operating transmission shaft (4). A tripping link (2) and a closing link (3) are provided above the operating transmission shaft (4). Both the tripping link (2) and the closing link (3) are provided with a crank arm (5), and the end of the crank arm (5) cooperates with the tripping locking mechanism.

2. The solid-insulated ring main unit operating mechanism according to claim 1, characterized in that, The release locking mechanism is provided with a release rod (6), the release rod (6) and the locking rod (7) cooperate with each other, the release rod (6) is in the position pushed by the cam (8), and the cam (8) is mounted on the operating transmission shaft (4).

3. The solid-insulated ring main unit operating mechanism according to claim 2, characterized in that, The tripping rod (6) is connected to the electromagnetic tripping coil (17), which is connected to the electrical circuit via the terminal block (20).

4. The solid-insulated ring main unit operating mechanism according to claim 3, characterized in that, The operating transmission shaft (4) is provided with a limiting block (9) to restrict the rotation angle position.

5. The solid-insulated ring main unit operating mechanism according to claim 4, characterized in that, It also includes an interlocking rod (10), which is configured to cooperate with the grounding knife operating shaft (11) and the mechanical locking pin (12). The side of the grounding knife operating shaft (11) is provided with the mechanical locking pin (12).

6. The solid-insulated ring main unit operating mechanism according to claim 5, characterized in that, The side of the operating transmission shaft (4) is provided with a buffer pad (14).

7. The solid-insulated ring main unit operating mechanism according to claim 6, characterized in that, It also includes a linkage plate (15), which is connected to a slider (16), and the slider (16) is installed in a guide groove (18).

8. The solid-insulated ring main unit operating mechanism according to claim 7, characterized in that, The end of the limiting block (9) is provided with a positioning pin (19).

9. The solid-insulated ring main unit operating mechanism according to claim 8, characterized in that, The operating mechanism is provided with a protective cover (21).

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