A closing device for a circuit breaker

Abstract

The application relates to the technical field of circuit breakers, and discloses a closing device of a circuit breaker, which comprises a circuit breaker body, upper and lower connection columns arranged on the circuit breaker body, a transmission assembly arranged on the circuit breaker body, a lock catch mechanism and an adjusting mechanism arranged on the transmission assembly, and the upper and lower connection columns are movably connected with an isolating knife switch; the transmission assembly comprises a transmission main rod rotatably arranged on the circuit breaker body. The closing device of the circuit breaker can accurately isolate and cut off the corresponding fault line in the A knife switch, the B knife switch and the C knife switch of the isolating knife switch when a fault occurs in a phase line of the three-phase line of the circuit breaker, the specific knife switch is unlocked, and the other knife switches remain in the locked state, so that the non-fault phase is not powered off, the normal lines are not affected due to the misoperation, and the stability and reliability of the power system are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and more particularly to a circuit breaker closing device. Background Technology

[0002] Outdoor high-voltage vacuum circuit breakers, as crucial switching equipment in power systems, are widely used in power transmission and distribution networks to disconnect and connect circuits under normal or fault conditions, ensuring the safe and stable operation of the power system. Their core advantage lies in using vacuum as the arc-extinguishing medium, resulting in high breaking capacity, long electrical life, small size, light weight, and low maintenance requirements, making them particularly suitable for frequent operation applications. During the operation of outdoor high-voltage vacuum circuit breakers, the closing device is the key component for ensuring reliable circuit breaker closure. It precisely controls the moving and stationary contacts of the circuit breaker to complete the closing action at a predetermined time, ensuring that power lines can be safely and promptly restored according to dispatch instructions, thereby maintaining the continuity of the power grid and the reliability of power supply. Therefore, the performance of the closing device directly affects the overall operating effect of the circuit breaker and the stability of the power system.

[0003] However, existing outdoor high-voltage vacuum circuit breaker closing devices still have certain limitations in use. Currently, most circuit breaker devices typically use a single drive shaft to achieve a three-phase linkage closing mechanism. Although this design simplifies the structure and reduces costs, it cannot selectively isolate the faulty phase when facing a single-phase fault in the power system. Once a fault occurs in a certain phase line, the traditional closing device must disconnect the entire three-phase circuit breaker simultaneously, causing the non-faulty phase lines to also lose power, resulting in a complete power outage. This greatly affects the reliability and continuity of power supply. This design also limits the development potential of circuit breakers in adaptive control and makes it difficult to meet the higher requirements of modern power systems for equipment flexibility. Therefore, it has shortcomings and cannot meet the user's needs, so further improvement is necessary.

[0004] Therefore, in view of this, we will study and improve the existing structure and its shortcomings, and provide a circuit breaker closing device in order to achieve a more practical purpose. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a circuit breaker closing device, which is achieved by the following specific technical means:

[0006] A circuit breaker closing device includes a circuit breaker body, an upper terminal and a lower terminal disposed on the circuit breaker body, a transmission assembly disposed on the circuit breaker body, and a locking mechanism and an adjusting mechanism disposed on the transmission assembly.

[0007] An isolating switch is movably connected between the upper terminal and the lower terminal;

[0008] The transmission assembly includes a transmission main rod rotatably mounted on the circuit breaker body, the transmission main rod having an inner cavity, the adjustment mechanism including an adjustment rod rotatably mounted in the inner cavity of the transmission main rod, the adjustment rod having several grooves on its outer periphery, and a limit component being provided in the grooves, the inner cavity wall of the transmission main rod having a through-hole slot as a movement channel for the limit component;

[0009] The locking mechanism includes a locking sleeve rotatably mounted on the outer periphery of the transmission main rod. The locking sleeve has a locking groove inside. A pressure relief component for unlocking the limiting component is movably installed on the locking groove. The limiting component is locked by one end passing through the opening groove and embedding into the locking groove. The limiting component is also released from mechanical constraint by being pressed down by external force.

[0010] As a further description of the above technical solution:

[0011] The isolating disconnectors include disconnectors A, B, and C arranged sequentially from left to right. Disconnectors A, B, and C are mechanically linked to perform opening and closing operations and constitute a complete three-phase power supply isolation system.

[0012] As a further description of the above technical solution:

[0013] The transmission assembly also includes a connecting pin fixedly mounted on the outer wall of the locking sleeve. A push rod is rotatably mounted on one end of the connecting pin, and the upper end of the push rod is rotatably connected to the isolating switch.

[0014] One end of the transmission main rod is fixedly equipped with an operating handle for opening and closing the circuit breaker.

[0015] As a further description of the above technical solution:

[0016] An electric component is provided on one side of the circuit breaker body. The electric component includes a fixed seat fixedly mounted on the side wall of the circuit breaker body. An electric telescopic device is movably mounted on the fixed seat. The telescopic end of the electric telescopic device is movably connected to a linkage rod. The linkage rod is fixedly mounted on the transmission main rod.

[0017] As a further description of the above technical solution:

[0018] The pressure relief assembly includes a movable rod that is slidably mounted on the latch groove. A movable plate is fixedly installed at one end of the movable rod. A pressure relief block is fixedly installed on one side of the movable plate. A return spring is fixedly connected between one side of the movable plate and the wall of the latch groove. A pressing element is fixedly installed on the side of the movable rod away from the movable plate.

[0019] As a further description of the above technical solution:

[0020] The locking mechanism also includes a safety component disposed on the outer periphery of the movable rod. The safety component includes a safety seat fixedly mounted on the outer wall of the locking sleeve. A tightening ring is fixedly installed on the upper side of the safety seat. An external thread is provided on the outer wall of the tightening ring. A tightening sleeve is rotatably mounted on the outer periphery of the safety seat by thread engagement.

[0021] As a further description of the above technical solution:

[0022] The tightening ring has several dividing grooves, which divide one end of the tightening ring into several tightening parts for tightening the movable rod. The outer end of the tightening part is a slightly outward-opening flared mouth.

[0023] As a further description of the above technical solution:

[0024] The limiting assembly includes a limiting shell fixedly assembled in the groove of the adjusting rod, a limiting plate movably installed inside the limiting shell, a limiting post fixedly installed on one side of the limiting plate, the end of the limiting post away from the limiting plate penetrating the limiting shell, and a limiting spring fixedly connected between the other side of the limiting plate and the inner wall of the limiting shell.

[0025] As a further description of the above technical solution:

[0026] The end of the limiting post furthest from the limiting plate is hemispherical.

[0027] As a further description of the above technical solution:

[0028] The limiting assembly also includes an adjusting head fixedly mounted on one end of the adjusting rod. The adjusting head is provided with four marking areas: A, B, C, and O. An indicator strip is fixedly installed on the side wall of the circuit breaker body. The indicator strip is used in conjunction with the adjusting head.

[0029] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0030] 1. The closing device of this circuit breaker can accurately isolate and disconnect the power to the corresponding faulty line among the A, B, and C disconnectors when a fault occurs in one phase of the three-phase circuit. Through the linkage operation of a series of components such as the pressing component driving the movable rod, the mechanical constraint of the limit component on the transmission rod and the locking sleeve is precisely released. Then, the specific disconnector is unlocked by rotating the adjusting head, while the other disconnectors remain locked, preventing power outages to non-faulty phases. This operation method can avoid affecting other normal lines due to misoperation, effectively improving the stability and reliability of the power system, ensuring the normal power supply to non-faulty lines, reducing the scope and time of power outages, and reducing economic losses caused by power outages.

[0031] 2. After line maintenance is completed, the closing device of this circuit breaker must lock all disconnectors A, B, and C. By rotating the tightening sleeve on the safety assembly, the tightening element on the tightening ring is tightly pressed against the outer wall of the movable rod, effectively limiting the displacement of the movable rod. This design effectively prevents the movable rod from loosening and avoids accidental movement that could release the mechanical constraints of the limiting assembly and locking sleeve. This ensures that the repaired line will not experience another fault due to unexpected circumstances during normal operation, further improving the safety and stability of the power system and providing a strong guarantee for the long-term reliable operation of the power system.

[0032] 3. The closing device of this circuit breaker has two operating modes: manual and electric. In electric mode, the extension rod of the electric expansion joint pushes the linkage rod and other components, triggering the opening and closing of the circuit breaker with an electrical signal. This enables fast and precise remote control, suitable for normal power system dispatching and automatic opening and closing operations after a fault, greatly improving operational efficiency and automation. In manual mode, after the electric expansion joint is de-energized in advance, the operator can manually control the operating handle to complete the opening and closing operations, eliminating reliance on the electrical control circuit. This manual-automatic integrated design allows for direct mechanical operation even in the event of automatic system failure, power outage, or emergency, ensuring that the power system can still complete the opening and closing actions in emergency situations. This greatly enhances the applicability and reliability of the device, providing dual protection for the safe and stable operation of the power system. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the overall three-dimensional structure provided according to an embodiment of the present invention is shown;

[0035] Figure 2 A front view provided according to an embodiment of the present invention is shown;

[0036] Figure 3 A top view provided according to an embodiment of the present invention is shown;

[0037] Figure 4 A side view provided according to an embodiment of the present invention is shown;

[0038] Figure 5 A schematic diagram of the installation structure of the circuit breaker body and transmission assembly according to an embodiment of the present invention is shown;

[0039] Figure 6 A schematic diagram of the installation structure of the circuit breaker body and the electric component according to an embodiment of the present invention is shown;

[0040] Figure 7 The present invention provides an embodiment of the invention. Figure 4 Enlarged diagram of part A in the middle;

[0041] Figure 8 A schematic diagram of the installation structure of the transmission main rod and the locking mechanism according to an embodiment of the present invention is shown;

[0042] Figure 9 A schematic diagram of the installation structure of the transmission main rod and the adjustment mechanism according to an embodiment of the present invention is shown;

[0043] Figure 10 The present invention provides an embodiment of the invention. Figure 9 Enlarged diagram of section B;

[0044] Figure 11 A partial structural schematic diagram of an insurance component provided according to an embodiment of the present invention is shown;

[0045] Figure 12 A schematic diagram of the adjustment lever partition state provided according to an embodiment of the present invention is shown.

[0046] Legend:

[0047] 10. Circuit breaker body; 11. Upper terminal; 12. Lower terminal; 13. Isolating switch; 131. A disconnector; 132. B disconnector; 133. C disconnector; 14. Indicator bar;

[0048] 20. Transmission assembly; 21. Transmission main rod; 211. Opening slot; 22. Connecting pin; 23. Push rod; 24. Operating handle;

[0049] 30. Electric component; 31. Fixed base; 32. Electric telescopic device; 33. Linkage rod;

[0050] 40. Locking mechanism; 41. Locking sleeve; 411. Locking groove; 42. Pressure relief assembly; 421. Movable rod; 422. Movable plate; 423. Pressure relief block; 424. Return spring; 425. Pressing element; 43. Safety assembly; 431. Safety seat; 432. Tightening ring; 4321. Dividing groove; 433. Tightening sleeve;

[0051] 50. Adjustment mechanism; 51. Adjustment rod; 52. Adjustment head; 53. Limiting assembly; 531. Limiting shell; 532. Limiting plate; 533. Limiting post; 534. Limiting spring. Detailed Implementation

[0052] 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0053] Please see Figures 1 to 12 A circuit breaker closing device includes a circuit breaker body 10, an upper terminal 11 and a lower terminal 12 disposed on the circuit breaker body 10, a transmission assembly 20 disposed on the circuit breaker body 10, a locking mechanism 40 and an adjusting mechanism 50 disposed on the transmission assembly 20; an isolating switch 13 is movably connected between the upper terminal 11 and the lower terminal 12; the transmission assembly 20 includes a transmission main rod 21 rotatably mounted on the circuit breaker body 10, the transmission main rod 21 having an inner cavity; the adjusting mechanism 50 includes an adjusting rod 51 rotatably mounted in the inner cavity of the transmission main rod 21, the adjusting rod 51 having an outer... The transmission main rod 21 has several grooves, and a limit component 53 is installed in the groove. A through-hole slot 211 is opened on the inner cavity wall of the transmission main rod 21 as a movement channel for the limit component 53. The locking mechanism 40 includes a locking sleeve 41 rotatably mounted on the outer periphery of the transmission main rod 21. A locking groove 411 is opened inside the locking sleeve 41. A pressure relief component 42 for unlocking the limit component 53 is movably installed on the locking groove 411. The limit component 53 is locked by one end passing through the opening slot 211 and embedding into the locking groove 411. The limit component 53 is forced to retract into the groove and release the mechanical constraint by the pressure relief component 42 being pressed down by external force.

[0054] When a fault occurs in one phase of the three-phase circuit of the circuit breaker, the corresponding faulty line in the isolating disconnectors 13 (A disconnector 131, B disconnector 132, and C disconnector 133) can be precisely isolated and de-energized. Through the linkage operation of the pressing component 425, the moving rod 421 and other components are driven to precisely release the mechanical constraint of the limit component 53 on the transmission main rod 21 and the locking sleeve 41. Then, the specific disconnector is unlocked by rotating the adjusting head 52, while the other disconnectors remain locked, preventing power outages to non-faulty phases. This operation method can prevent other normal lines from being affected by misoperation, effectively improving the stability and reliability of the power system, ensuring the normal power supply of non-faulty lines, reducing the scope and time of power outages, and reducing economic losses caused by power outages.

[0055] Please see Figures 1 to 3The isolating switch 13 includes A switch 131, B switch 132 and C switch 133 arranged from left to right. A switch 131, B switch 132 and C switch 133 achieve opening and closing operations through mechanical linkage and form a complete three-phase power supply isolation system. Through the regional arrangement of A switch 131, B switch 132 and C switch 133, independent isolation of different sections of the circuit can be achieved.

[0056] Please see Figure 1 , Figure 5 The transmission assembly 20 also includes a connecting pin 22 fixedly mounted on the outer wall of the locking sleeve 41. A push rod 23 is rotatably mounted on one end of the connecting pin 22, and the upper end of the push rod 23 is rotatably connected to the isolating switch 13. A control handle 24 for opening and closing the switch is fixedly mounted on one end of the transmission main rod 21. In manual mode, the electric expansion joint 32 is pre-powered to ensure operational safety. The electric expansion joint 32 is equipped with a manual clutch, allowing the electric mode to be switched to manual mode by operating the clutch during power outages. In manual mode, the electric expansion joint 32... The telescopic rod can move freely without being restricted by the motor or brake. The operator manually controls the operating handle 24. By rotating the operating handle 24, the operating handle 24 drives the transmission main rod 21 to rotate. The rotation mode of the transmission main rod 21 is the same as in the electric mode. It will also drive the locking mechanism 40 and the connecting pin 22 to move, thereby driving the push rod 23 to drive the isolating switch 13 to perform opening and closing operations. Moreover, this manual operation mode eliminates the dependence on the electrical control circuit. In the event of automatic system failure, power outage or emergency, it can still ensure the completion of opening and closing operations.

[0057] Please see Figure 1 , Figure 6 An electric component 30 is provided on one side of the circuit breaker body 10. The electric component 30 includes a fixed seat 31 fixedly mounted on the side wall of the circuit breaker body 10. An electric telescopic device 32 is movably mounted on the fixed seat 31. The telescopic end of the electric telescopic device 32 is movably connected to a linkage rod 33, which is fixedly mounted on the transmission main rod 21. In electric mode, when closing or opening operations are required, the electric telescopic device 32 is activated. The telescopic rod of the electric telescopic device 32 pushes the linkage rod 33 to move. The linkage rod 33 is connected to the transmission main rod 21. Its movement will drive the transmission main rod 21 to rotate on the circuit breaker body 10. During the rotation of the transmission main rod 21, the locking mechanism 40 and the connecting pin 22 on the locking mechanism 40 are moved synchronously. The connecting pin 22 is connected to the push rod 23, which in turn drives the push rod 23 to drive the isolating switch 13 to perform opening and closing operations. The electric telescopic device 32 is triggered by an electrical signal, which can realize fast and accurate remote control. It is suitable for normal power system dispatching and automatic opening and closing operations after a fault.

[0058] Please see Figure 4 , Figure 7 , Figure 12 The limiting assembly 53 also includes an adjusting head 52 fixedly mounted on one end of the adjusting rod 51. The adjusting head 52 is provided with four marking areas: A, B, C, and O. An indicator strip 14 is fixedly installed on the side wall of the circuit breaker body 10. The indicator strip 14 works in conjunction with the adjusting head 52. By setting different marking areas such as A, B, C, and O on the adjusting head 52 and corresponding to the indicator strip 14, the operator can clearly and accurately judge the current operating status and the status of the target disconnector during operation. This design can effectively avoid operational errors caused by misjudgment, improve the accuracy and safety of operation, reduce the risk of accidents caused by improper operation, and ensure the normal operation of the power system and the personal safety of the operator.

[0059] Please see Figures 8 to 10 The pressure relief assembly 42 includes a movable rod 421 slidably mounted on the latch groove 411. A movable plate 422 is fixedly installed at one end of the movable rod 421. A pressure relief block 423 is fixedly installed on one side of the movable plate 422. A return spring 424 is fixedly connected between one side of the movable plate 422 and the wall of the latch groove 411. A pressing member 425 is fixedly installed on the side of the movable rod 421 away from the movable plate 422. By pressing down on the pressing member 425, the pressing member 425 drives the movable rod 421 to move downward. During the downward movement of the movable rod 421, it simultaneously pushes the movable plate 422 and relieves pressure. Block 423 moves down synchronously and squeezes the reset spring 424. As the pressure relief block 423 continues to move down, the bottom of the pressure relief block 423 contacts the limiting post 533 and pushes the limiting post 533 down. As the limiting post 533 moves down, it drives the limiting plate 532 to squeeze the limiting spring 534. At the same time, the outer end of the limiting post 533 is slightly lower than the opening slot 211 on the transmission main rod 21, and the limiting post 533 retracts into the groove of the adjusting rod 51, thereby effectively releasing the mechanical constraint of the limiting component 53 on the transmission main rod 21 and the locking sleeve 41.

[0060] Please see Figures 8 to 11The locking mechanism 40 also includes a safety assembly 43 disposed on the outer periphery of the movable rod 421. The safety assembly 43 includes a safety seat 431 fixedly mounted on the outer wall of the locking sleeve 41. A tightening ring 432 is fixedly mounted on the upper side of the safety seat 431. The outer wall of the tightening ring 432 is provided with external threads. The tightening sleeve 433 is rotatably mounted on the outer periphery of the safety seat 431 by screwing the threads. By rotating the tightening sleeve 433 on the safety assembly 43, the tightening sleeve 433 is driven to move towards the outer end of the tightening ring 432. As the tightening sleeve 433 continuously rotates on the tightening ring 432, A compressive force is gradually applied to the tightening members on the tightening ring 432. Under this compressive force, the tightening members on the tightening ring 432 undergo elastic deformation, causing several tightening members to bend inward and close together along the central axis of the movable rod 421. This makes the inner wall of the tightening members on the tightening ring 432 tightly abut against the outer wall of the movable rod 421, thereby limiting the displacement of the movable rod 421, effectively preventing the movable rod 421 from loosening, and avoiding the movable rod 421 from accidentally moving and releasing the mechanical constraints of the limiting component 53 and the locking sleeve 41, further improving safety.

[0061] Please see Figures 10 to 11 The tightening ring 432 has several dividing grooves 4321. The tightening ring 432 divides one end of the tightening ring 432 into several tightening parts for tightening the movable rod 421 through the dividing grooves 4321, and the outer end of the tightening parts is a slightly outward-opening flared mouth. The dividing grooves 4321 can divide one end of the tightening ring 432 into tightening parts for tightening the movable rod 421, which is beneficial for limiting the movement of the movable rod 421.

[0062] Please see Figures 9 to 10 The limiting assembly 53 includes a limiting shell 531 fixedly assembled in the groove of the adjusting rod 51. A limiting plate 532 is movably installed inside the limiting shell 531. A limiting post 533 is fixedly installed on one side of the limiting plate 532. One end of the limiting post 533 away from the limiting plate 532 passes through the limiting shell 531. A limiting spring 534 is fixedly connected between the other side of the limiting plate 532 and the inner wall of the limiting shell 531. Based on the elastic force of the limiting spring 534, the limiting post 533 in the limiting assembly 53 pushes the limiting plate 532 and the limiting post 533 upward, causing the limiting post 533 to move upward and pass through the opening groove 211 to insert into the locking groove 411 of the locking sleeve 41, thereby locking the transmission main rod 21 and the locking sleeve 41.

[0063] Please see Figure 10 The end of the limiting post 533 away from the limiting plate 532 is set in a hemispherical shape. By setting one end of the limiting post 533 in a hemispherical shape, the movement of the limiting post 533 will not be affected when the outer end of the limiting post 533 contacts the transmission main rod 21, thus further improving its applicability.

[0064] Working principle: The circuit breaker closing device of this application has both manual and electric operation modes to meet the needs of different scenarios;

[0065] In electric mode, when closing or opening operations are required, the electric expansion joint 32 is activated. The telescopic rod of the electric expansion joint 32 pushes the linkage rod 33 to move. The linkage rod 33 is connected to the transmission main rod 21. Its movement will drive the transmission main rod 21 to rotate on the circuit breaker body 10. During the rotation of the transmission main rod 21, the locking mechanism 40 and the connecting pin 22 on the locking mechanism 40 are moved synchronously. The connecting pin 22 is connected to the push rod 23, which in turn drives the push rod 23 to drive the isolating switch 13 to perform opening and closing operations. The electric expansion joint 32 is triggered by an electrical signal, which can realize fast and accurate remote control. It is suitable for normal power system dispatching and automatic opening and closing operations after a fault.

[0066] In manual mode, the electric telescopic device 32 is pre-powered to ensure operational safety. The electric telescopic device 32 is equipped with a manual clutch, which allows switching from electric mode to manual mode when the power is off. In manual mode, the telescopic rod of the electric telescopic device 32 can move freely without being restricted by the motor or brake. The operator manually controls the operating handle 24. By rotating the operating handle 24, the operating handle 24 drives the transmission main rod 21 to rotate. The rotation of the transmission main rod 21 is the same as in electric mode, which also drives the locking mechanism 40 and the connecting pin 22 to move, thereby driving the push rod 23 to drive the isolating switch 13 to perform opening and closing operations. This manual operation method eliminates the dependence on the electrical control circuit and can still ensure the completion of opening and closing operations in the event of automatic system failure, power outage, or emergency.

[0067] When a fault occurs in one phase of the three-phase circuit of the circuit breaker, the corresponding lines of the isolating disconnectors 131 (A), 132 (B), and 133 (C) need to be isolated and de-energized. Taking isolating disconnector 131 (A) as an example, the safety of the movable rod 421 is first released by rotating the tightening sleeve 433 on the safety assembly 43. The tightening sleeve 433 rotates on the tightening ring 432, gradually releasing the pressure of the tightening sleeve 433 on the tightening ring 432. After the tightening part separated by the dividing groove 4321 at one end of the tightening ring 432 loses the pressure, it returns to its original state under its own elasticity, thereby driving the tightening part on the tightening ring 432 to release the pressure on the movable rod 421, loosening the radial constraint on the movable rod 421, realizing the axial free movement of the movable rod 421, and unlocking the movable rod 421.

[0068] Next, by pressing down the pressing member 425, the pressing member 425 drives the movable rod 421 to move downward. During the downward movement of the movable rod 421, the movable plate 422 and the pressure relief block 423 are pushed down synchronously, and the return spring 424 is squeezed. As the pressure relief block 423 continues to move down, the bottom of the pressure relief block 423 contacts the limiting post 533, and the pressure relief block 423 pushes the limiting post 533 down. At the same time, the limiting post 533 drives the limiting plate 532 to squeeze the limiting spring 534, and at the same time, the outer end of the limiting post 533 is slightly lower than the opening slot 211 on the transmission main rod 21, and the limiting post 533 retracts into the groove of the adjusting rod 51, thereby effectively releasing the mechanical constraint of the limiting component 53 on the transmission main rod 21 and the locking sleeve 41.

[0069] At this time, by rotating the adjusting head 52, the marking area at point A on the adjusting head 52 is aligned with the indicator strip 14. Then, the downward pressure on the pressing member 425 is released. Based on the elastic force of the reset spring 424, the movable plate 422 is pushed upward. The movable plate 422 drives the movable rod 421 and the pressure relief block 423 to reset. At this time, the limiting component 53 corresponding to the A knife switch 131 fails due to the change in position of the transmission main rod 21. The limiting components 53 at the B knife switch 132 and the C knife switch 133 are exactly located at the opening slot 211 of the transmission main rod 21. Based on the elastic force of the limiting spring 534, the limiting plate 532 and the limiting post 533 in the limiting component 53 are pushed upward. The limit pin 533 is driven to move upward and penetrate the opening slot 211 to insert into the locking slot 411 of the locking sleeve 41, thereby locking the transmission main rod 21 and the locking sleeve 41. This releases the mechanical constraint of the A knife switch 131 and keeps the B knife switch 132 and C knife switch 133 locked, thus achieving single-phase mechanical isolation. When it is necessary to isolate and disconnect the B knife switch 132 or the C knife switch 133, the above operation is repeated, and the marking area at B or C on the adjusting head 52 is aligned with the indicator bar 14. At the same time, the marking area at O ​​on the adjusting head 52 represents the complete locking of the A knife switch 131, the B knife switch 132 and the C knife switch 133, so that they are all in a mechanical constraint state.

[0070] After the line maintenance is completed, all disconnectors A 131, B 132, and C 133 should be locked. This is done by rotating the adjusting head 52 to the O marking area to restore all disconnectors to the locked state. After locking, rotate the tightening sleeve 433 on the safety assembly 43 to move it towards the outer end of the tightening ring 432. Since the initial state of the tightening element at the outer end of the tightening ring 432 is a slightly open flared opening, as the tightening sleeve 433 rotates continuously on the tightening ring 432, it tightens the tension on the tightening ring 432. The tightening member gradually applies a compressive force. Under this compressive force, the tightening member on the tightening ring 432 undergoes elastic deformation, causing several tightening members to bend inward and close together along the central axis of the movable rod 421. This makes the inner wall of the tightening member on the tightening ring 432 tightly abut against the outer wall of the movable rod 421, thereby limiting the displacement of the movable rod 421, effectively preventing the movable rod 421 from loosening, and avoiding the movable rod 421 from accidentally moving and releasing the mechanical constraints of the limiting component 53 and the locking sleeve 41, further improving safety.

[0071] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A closing device for a circuit breaker, comprising a circuit breaker body (10), and an upper terminal (11) and a lower terminal (12) disposed on the circuit breaker body (10), characterized in that: It also includes a transmission assembly (20) disposed on the circuit breaker body (10), and a locking mechanism (40) and an adjusting mechanism (50) disposed on the transmission assembly (20). An isolating switch (13) is movably connected between the upper terminal (11) and the lower terminal (12). The transmission assembly (20) includes a transmission main rod (21) rotatably mounted on the circuit breaker body (10). The transmission main rod (21) has an inner cavity. The adjustment mechanism (50) includes an adjustment rod (51) rotatably mounted in the inner cavity of the transmission main rod (21). The outer periphery of the adjustment rod (51) has several grooves, and a limit component (53) is provided in the grooves. The inner cavity wall of the transmission main rod (21) has a through-hole slot (211) as a movement channel for the limit component (53). The locking mechanism (40) includes a locking sleeve (41) rotatably mounted on the outer periphery of the transmission main rod (21). The locking sleeve (41) has a locking groove (411) inside. A pressure relief component (42) for unlocking the limiting component (53) is movably mounted on the locking groove (411). The limiting component (53) is locked by passing one end through the opening groove (211) and embedding into the locking groove (411). The limiting component (53) is forced to retract into the groove and release the mechanical constraint by being pressed down by the pressure relief component (42) by external force. The pressure relief assembly (42) includes a movable rod (421) slidably mounted on a latch groove (411). A movable plate (422) is fixedly installed at one end of the movable rod (421). A pressure relief block (423) is fixedly installed on one side of the movable plate (422). A return spring (424) is fixedly connected between one side of the movable plate (422) and the wall of the latch groove (411). A pressing element (425) is fixedly installed on the side of the movable rod (421) away from the movable plate (422). The limiting assembly (53) includes a limiting shell (531) fixedly assembled in the groove of the adjusting rod (51). A limiting plate (532) is movably installed inside the limiting shell (531). A limiting post (533) is fixedly installed on one side of the limiting plate (532). The end of the limiting post (533) away from the limiting plate (532) passes through the limiting shell (531). A limiting spring (534) is fixedly connected between the other side of the limiting plate (532) and the inner wall of the limiting shell (531).

2. The closing device for a circuit breaker according to claim 1, characterized in that: The isolating switch (13) includes A switch (131), B switch (132) and C switch (133) arranged from left to right. The A switch (131), B switch (132) and C switch (133) achieve opening and closing operations through mechanical linkage and form a complete three-phase power supply isolation system.

3. The closing device for a circuit breaker according to claim 1, characterized in that: The transmission assembly (20) also includes a connecting pin (22) fixedly mounted on the outer wall of the locking sleeve (41). One end of the connecting pin (22) is rotatably mounted with a push rod (23), and the upper end of the push rod (23) is rotatably connected to the isolating knife switch (13). One end of the transmission main rod (21) is fixedly equipped with an operating handle (24) for opening and closing the circuit breaker.

4. The closing device for a circuit breaker according to claim 1, characterized in that: An electric component (30) is provided on one side of the circuit breaker body (10). The electric component (30) includes a fixed seat (31) fixedly mounted on the side wall of the circuit breaker body (10). An electric telescopic device (32) is movably mounted on the fixed seat (31). A linkage rod (33) is movably connected to the telescopic end of the electric telescopic device (32). The linkage rod (33) is fixedly mounted on the transmission main rod (21).

5. The closing device for a circuit breaker according to claim 1, characterized in that: The locking mechanism (40) further includes a safety component (43) disposed on the outer periphery of the movable rod (421). The safety component (43) includes a safety seat (431) fixedly mounted on the outer wall of the locking sleeve (41). A tightening ring (432) is fixedly installed on the upper side of the safety seat (431). An external thread is provided on the outer wall of the tightening ring (432). The tightening sleeve (433) is rotatably mounted on the outer periphery of the safety seat (431) by thread engagement.

6. The closing device for a circuit breaker according to claim 5, characterized in that: The tightening ring (432) is provided with several dividing grooves (4321). The tightening ring (432) is divided into several tightening parts for tightening the movable rod (421) through the dividing grooves (4321), and the outer end of the tightening part is a slightly outward-opening trumpet mouth.

7. The closing device for a circuit breaker according to claim 1, characterized in that: The end of the limiting post (533) away from the limiting plate (532) is set in a hemispherical shape.

8. The closing device for a circuit breaker according to claim 1, characterized in that: The limiting component (53) also includes an adjusting head (52) fixedly mounted on one end of the adjusting rod (51). The adjusting head (52) is provided with four marking areas: A, B, C, and O. An indicator strip (14) is fixedly installed on the side wall of the circuit breaker body (10). The indicator strip (14) is used in conjunction with the adjusting head (52).

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