Self-locking device for integrated isolating switch of pole-mounted vacuum circuit breaker
Through the mechanical linkage design of the self-locking device, the problem of the shift plate and the static contact being displaced under electric power is solved, and the stable closing and opening of the isolating switch is achieved, which improves the operating reliability of the equipment.
Patent Information
- Application Number
- CN202421686947.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the closed state of the existing column vacuum circuit breaker integrated isolation switch, the contact plate and the contact are prone to relative displacement due to the influence of electrical power, resulting in a decrease in the contact area or even disengagement, creating an arc and burning the equipment.
A self-locking device is designed, including a hook plate, a self-locking plate, a pull rod and a self-locking fixing pin. Through mechanical linkage, the gate is closed and locked, and the gate is opened to prevent displacement between the contact plate and the static contact, and a tight self-locking is formed by using the hook plate and the pad plate.
It improves the operating stability and reliability of the isolating switch, prevents relative displacement between the contact plate and the static contact, avoids equipment burning, and improves the integrated performance of the circuit breaker and the isolating switch.
Smart Images
Figure CN223092758U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power system applications, and specifically relates to a self-locking device for an integrated disconnecting switch of a pole-mounted vacuum circuit breaker. Background Art
[0002] As a protection device in the power system, the circuit breaker can break the fault current in an extremely short time, cut off the faulty line from the main grid, prevent the fault current from impacting the power grid, and protect the electrical equipment and personal and property safety. When the line is under power outage maintenance, the disconnecting switch placed on one side or both sides of the circuit breaker needs to be placed in the open state to form an obvious visible isolation break. Therefore, the circuit breaker and the disconnecting switch are often used in combination, and the design scheme of integrating the circuit breaker and the disconnecting switch is more popular in the market. This design scheme integrally installs the disconnecting switch and the circuit breaker body, and at the same time, the mechanical interlock structure can prevent the disconnecting switch from being opened under load.
[0003] When most of the integrated disconnecting switches on the market are in the closed state, they mainly rely on the pressure exerted by the spring at one end of the contact plate and the downward pressure generated by the over-center spring on the main shaft to clamp the contact. In this design, when encountering a large short-circuit current, affected by the electrodynamic force, relative displacement is likely to occur between the contact plate and the contact. After several accumulations, the contact area between the contact plate and the contact will gradually decrease, and even break away from the contact, generating an arc and burning the equipment. Summary of the Invention
[0004] To solve the above existing technical problems, the utility model provides a self-locking device for an integrated disconnecting switch of a pole-mounted vacuum circuit breaker, which automatically realizes the functions of closing and locking and opening and unlocking during the closing and opening processes without manual intervention, and improves the operation stability and reliability of the disconnecting switch.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A self-locking device for an integrated disconnector of a pole-mounted vacuum circuit breaker. The integrated disconnector of the vacuum circuit breaker includes a chassis, a support insulator, an insulating pull rod, a static contact, a contact plate, a backing plate, and a main shaft. The chassis is integrally installed and fixed to the vacuum circuit breaker body through mounting holes. The main shaft is installed on the chassis. The support insulators are integrally installed on the chassis in three phases. A backing plate and a static contact are fixedly arranged on each group of support insulators. The contact plates are two opposite ones. One end of each contact plate is movably connected to the conductive clip of the vacuum circuit breaker body, and the other end is linked with the insulating pull rod through a crank arm to realize closing or separating from the static contact. The self-locking device includes a hook plate, a self-locking plate, a pull rod, and a self-locking fixing pin. The hook plate is arranged between the two contact plates through a shaft pin. On both sides of the hook plate on the shaft pin, a hook plate bushing is arranged on each side to fix its position between the two contact plates and enable it to rotate. A torsion spring is arranged on one of the hook plate bushings. One end of the torsion spring hooks the corresponding contact plate, and the other end hooks the hook plate to realize the reset of the hook plate after movement. The hook-shaped tail end of the hook plate is adjacent to one end of the backing plate. After rotating by a certain angle, the hook plate can hook the backing plate tightly and fixedly. The self-locking plate is arranged in an approximately isosceles triangle plate shape. A slot hole is arranged at the top angle position and is fixedly arranged between the two contact plates through a shaft pin. An arc-shaped open slot is arranged at the end. The self-locking fixing pin is arranged in the arc-shaped open slot and is connected to the two contact plates on both sides. The fixed end at the top angle position of the self-locking plate is arranged on the top of the insulating pull rod and is fixedly connected thereto. By pulling the insulating pull rod, the self-locking plate is driven to make a circular motion around the shaft pin and is limited by the self-locking fixing pin. A reserved long slot hole is arranged in the middle of the hook plate. One end of the pull rod hooks the reserved long slot hole of the hook plate, and the other end is fixedly connected to the self-locking plate. By the movement of the self-locking plate, the hook plate is driven to move, realizing self-locking and unlocking during the opening and closing of the disconnector.
[0007] One end of the pull rod is set in a right-angled structure and hooks in the reserved long slot hole of the hook plate. The other end of the pull rod is threadedly connected to the self-locking plate, and the initial position state of the pull rod is adjusted through the tightening and loosening of the thread.
[0008] The self-locking structure designed by the present utility model has a simple structure and is not easy to trip. When the integrated disconnector is closed, a tight self-locking is formed by the hook plate and the backing plate to prevent displacement between the contact plate and the static contact and long-term accumulation. During the automatic operation of the disconnector, the functions of automatic closing and locking and opening and unlocking are realized, making the performance of the integration of the circuit breaker and the disconnector more stable, solving the problem that most circuit breakers cause the disconnector to self-open during the rated breaking current and closing peak current tests, and providing higher reliability for the operation of the circuit breaker. Description of the Drawings
[0009] Figure 1 Structural schematic diagram of the self-locking device of the present utility model (one side contact plate is hidden);
[0010] Figure 2 It is an assembly drawing of an integrated disconnector for a circuit breaker;
[0011] Figure 3 It is an auxiliary view of the self-locking structure (hiding one side contact plate). Specific implementation manners
[0012] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0013] As Figure 1 shown, the self-locking device for the integrated disconnector of the pole-mounted vacuum circuit breaker, the integrated disconnector of the vacuum circuit breaker includes a chassis 1, a post insulator 2, an insulating pull rod 3, a static contact 4, a contact plate 5, a backing plate 6 and a main shaft 7. The chassis 1 is integrally installed and fixed with the vacuum circuit breaker body through mounting holes. The main shaft 7 is installed on the chassis 1. The post insulators 2 are integrally installed on the chassis 1 in three phases. A backing plate 6 and a static contact 4 are fixedly arranged on each group of the post insulators 2. The contact plates 5 are two opposite ones. One end of each is movably connected to the conductive clamp 9 of the vacuum circuit breaker body, and the other end is linked with the insulating pull rod 3 through a toggle arm to realize closing or separating from the static contact 4. The self-locking device includes a hook plate 10, a self-locking plate 11, a pull rod 12 and a self-locking fixing pin 13. The hook plate 10 is arranged between the two contact plates 5 through a pin. On both sides of the hook plate 10 on the pin, a hook plate bushing 8 is arranged on each side to fix its position between the two contact plates 5 and be rotatable. A torsion spring 15 is arranged on one side of the hook plate bushing 8. One end of the torsion spring 15 hooks the corresponding contact plate 5 and the other end hooks the hook plate 10 to realize the reset of the hook plate 10 after movement. The hook-shaped tail end of the hook plate 10 is adjacent to one end of the backing plate 6. After rotating by an angle, the hook plate 10 can hook the backing plate 6 tightly and fixedly. The self-locking plate 11 is arranged in an approximately isosceles triangle plate-like structure. A slot hole is arranged at its top angle position and is fixedly arranged between the two contact plates 5 through a pin. An arc-shaped open slot is arranged at the end. The self-locking fixing pin 13 is arranged in the arc-shaped open slot and is connected with the two contact plates 5 on both sides. The fixed end at the top angle position of the self-locking plate 11 is arranged at the top of the insulating pull rod 3 and is fixedly connected thereto. By pulling the insulating pull rod 3, the self-locking plate 11 is driven to make a circular motion around the pin and is limited by the self-locking fixing pin 13. A reserved long slot hole is arranged in the middle of the hook plate 10. One end of the pull rod 12 hooks the reserved long slot hole of the hook plate 10, and the other end is fixedly connected with the self-locking plate 11. By the movement of the self-locking plate 11, the hook plate 10 is driven to move, realizing self-locking and unlocking during the opening and closing of the disconnector.
[0014] As a preferred embodiment, one end of the pull rod 12 is provided with a right-angle structure and hooked in the reserved long slot hole of the hook plate 10. The other end of the pull rod 12 is threadedly connected to the self-locking plate 11, and the initial position state of the pull rod 12 is adjusted by the tightening and loosening of the thread.
[0015] During the actual application process, a switching handle 14 is provided on one side of the integrated disconnector of the circuit breaker, which can realize the manual switching operation of the integrated disconnector.
[0016] In the specific installation and implementation process of the present invention, the hook plate 10 and the self-locking plate 11 are both fixed between the two contact plates 5 by pin shafts. The hook plate 10 and the self-locking plate 11 are connected by a pull rod 12. One side of the self-locking plate 11 is connected to the insulating pull rod 3, and the other side is provided with an arc-shaped open slot, which can rotate freely within a certain angle. The self-locking fixing pin 13 is arranged between the two contact plates 5 and in the arc-shaped open slot on one side of the self-locking plate 11, and is fixed by a pin shaft structure to realize the limiting function of the self-locking plate 11. The hook plate 10 is fixed between the two contact plates 5 by a pin shaft structure and can rotate around the pin shaft. The hooked tail end of the hook plate 10 is adjacent to one end of the backing plate 6 and can hook one end of the backing plate 6 after rotating a certain angle; a torsion spring 15 is connected to the hook plate 10. In the natural state, the hooked tail end of the hook plate 10 is tightly fixed to one end of the backing plate 6. When the pull rod 12 is pulled, the hook plate 10 rotates counterclockwise around the pin shaft, so that its hooked tail end gradually disengages from one end of the backing plate 6. When the pull rod 12 is reset, under the action of the torsion spring 15, the hook plate 10 is reset.
[0017] In the open state of the circuit breaker, pull the switching handle 16 of the integrated disconnector to open it. As the main shaft 7 rotates, the insulating pull rod 3 moves upward under the action of the toggle arm, driving the self-locking plate 11 to make a clockwise circular motion along the pin shaft. After the self-locking plate 11 rotates a certain angle, it contacts the self-locking fixing pin 13. Using the lever principle, the contact plate 5 is driven to disengage from the static contact 4 to open the circuit. At the same time, as the self-locking plate 11 rotates, the pull rod 12 pulls the hook plate 10 to overcome the reverse force of the torsion spring 15 and make a circular motion along the pin shaft. As the rotation angle of the hook plate 10 increases, the self-locking structure realizes the unlocking of the opening.
[0018] During closing, as the main shaft 7 rotates in the reverse direction, the insulating pull rod 3 moves downward under the action of the toggle arm, driving the self-locking plate 11 to make a counterclockwise circular motion along the pin shaft. After the self-locking plate 11 rotates a certain angle, it contacts the self-locking shaft 13. Using the lever principle, the contact plate 5 is driven to rotate towards the static contact 4 for closing. As the self-locking plate 11 rotates, the right-angle end of the pull rod 12 retracts into the reserved long slot hole of the hook plate 10 and gradually loses the pulling force on the hook plate 10.
[0019] It can be seen from the design of the reserved long slot hole structure on one side of the hook plate 10 that the pull rod 12 has a certain amount of movement in the reserved long slot hole. During opening, as the self-locking plate 11 rotates, the pull rod 12 is pulled. The right-angle end of the pull rod 12 first has to complete the movement within the distance margin in the long slot hole of the hook plate 10 before driving the hook plate 10 to rotate. During closing, the pull rod 1 moves downward to the hook plate 10. At this time, the hook plate 10 is mainly reset by the force of the torsion spring 15. After closing is completed, the right-angle end of the pull rod 12 on one side of the hook plate 10 is not stressed and has a certain distance from the edge of the long slot hole. The advantage of such a structural design is to prevent damage to the components caused by rigid connection of the components of the self-locking device.
[0020] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the essence of the present invention should also fall within the protection scope of the present invention.
Claims
1. A self-locking device for an integrated disconnecting switch of a pole-mounted vacuum circuit breaker. The integrated disconnecting switch of the vacuum circuit breaker includes a chassis (1), a support insulator (2), an insulating tie rod (3), a static contact (4), a contact plate (5), a backing plate (6) and a main shaft (7). The chassis (1) is integrally installed and fixed to the vacuum circuit breaker body through mounting holes. The main shaft (7) is installed on the chassis (1). The support insulators (2) are integrally installed in three phases on the chassis (1). A backing plate (6) and a static contact (4) are fixedly arranged on each group of the support insulators (2). Two opposite contact plates (5) are provided. One end of each contact plate (5) is movably connected to the conductive clamp (9) of the vacuum circuit breaker body, and the other end is linked with the insulating tie rod (3) through a crank arm to achieve closing or separation from the static contact (4). It is characterized in that, The self-locking device includes a hook plate (10), a self-locking plate (11), a pull rod (12) and a self-locking fixing pin (13). The hook plate (10) is arranged between two contact plates (5) through a shaft pin. On both sides of the hook plate (10) on the shaft pin, a hook plate bushing (8) is arranged on each side to fix its position between the two contact plates (5) and enable it to rotate. A torsion spring (15) is arranged on one of the hook plate bushings (8). One end of the torsion spring (15) hooks the corresponding contact plate (5), and the other end hooks the hook plate (10) to realize the reset of the hook plate (10) after movement. The hook-shaped tail end of the hook plate (10) is adjacent to one end of the backing plate (6). After rotating a certain angle, the hook plate (10) can hook the backing plate (6) tightly and fixedly. The self-locking plate (11) is arranged in an approximately isosceles triangle plate-like structure. A slot hole is arranged at its apex position and is fixed between the two contact plates (5) through a shaft pin. An arc-shaped open slot is arranged at the end. The self-locking fixing pin (13) is arranged in the arc-shaped open slot and is connected to the two contact plates (5) on both sides. The fixed end at the apex position of the self-locking plate (11) is arranged at the top of the insulating pull rod (3) and is fixedly connected thereto. By pulling the insulating pull rod (3), the self-locking plate (11) is driven to make a circular motion around the shaft pin and is limited by the self-locking fixing pin (13). A reserved long slot hole is arranged in the middle of the hook plate (10). One end of the pull rod (12) hooks the reserved long slot hole of the hook plate (10), and the other end is fixedly connected to the self-locking plate (11). The movement of the self-locking plate (11) drives the hook plate (10) to move, realizing self-locking and unlocking when the disconnecting switch is opened and closed.
2. The self-locking device for the integrated disconnecting switch of the pole-mounted vacuum circuit breaker according to claim 1, characterized in that, One end of the pull rod (12) is arranged in a right-angle structure and hooks in the reserved long slot hole of the hook plate (10). The other end of the pull rod (12) is threadedly connected to the self-locking plate (11). The initial position state of the pull rod (12) is adjusted by tightening and loosening the thread.