A self-locking device for a pole-disconnection integrated T-type isolating switch
By introducing a self-locking device consisting of a hook plate, connecting rod, return spring, and self-locking connector into the T-type disconnector, automatic self-locking and unlocking are achieved, solving the problem of contact plate displacement under high current and improving the operational stability and reliability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG TAIKAI INTELLIGENT POWER DISTRIBUTION CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-06-19
AI Technical Summary
The disconnecting switch of the existing T-type pole-mounted high-voltage AC vacuum circuit breaker is prone to relative displacement between the contact plate and the contact head under high current conditions due to the influence of electrodynamics. Long-term accumulation may lead to a reduction in contact area or even separation, resulting in electric arc and burning of the equipment. In addition, it lacks an effective self-locking device.
A self-locking device for a T-type disconnector with integrated circuit breakers was designed, comprising a hook plate, a connecting rod, a return spring, and a self-locking connector. By hooking and fixing the hook plate to the pad, combined with the return spring and threaded connection, the disconnector can automatically self-lock and unlock during the opening and closing process, thus preventing contact plate displacement.
It improves the operational stability and reliability of T-type disconnect switches, prevents displacement between the contact plate and the stationary contact, ensures equipment safety, and is suitable for reliable operation during high-current breaking and closing.
Smart Images
Figure CN224384187U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power system application technology, specifically a self-locking device for a T-type disconnector switch with integrated column breakage. Background Technology
[0002] As a protective device in the power system, the pole-mounted high-voltage AC vacuum circuit breaker (hereinafter referred to as pole-mounted circuit breaker) mainly functions to interrupt the fault current in a very short time and protect the electrical equipment. The pole-mounted circuit breaker is often equipped with an integrated disconnecting switch to provide a clearly visible break when the line is shut down for maintenance. Currently, the integrated disconnecting switches of pole-mounted circuit breakers on the market are divided into L-type and T-type according to the different contact types.
[0003] When a line encounters a large short-circuit current, the disconnector switch is affected by electrodynamic forces, and the contact plate and the contact head are prone to relative displacement. After several accumulations, the contact area between the contact plate and the contact head will gradually decrease, and may even detach from the contact head, generating an electric arc and burning out the equipment. Previously, we designed a self-locking device for L-type integrated disconnector switches, which can automatically lock when the disconnector switch is closed, effectively solving the problem of electrodynamic influence. However, due to the small distance between the two contact plates of T-type disconnector switches, it is difficult to install a self-locking device. Currently, there is no T-type disconnector switch self-locking device on the market. Summary of the Invention
[0004] To address the aforementioned technical problems, this utility model provides a self-locking device for an integrated T-type disconnector switch. This device automatically locks when closing and unlocks when opening, eliminating the need for human intervention during the closing and opening processes, thus improving the operational stability and reliability of the T-type disconnector switch.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A self-locking device for an integrated T-type disconnecting switch includes a hook plate, a connecting rod, a return spring, and a self-locking connector. The hook plate is a shaped plate with a hook-like structure at the bottom, and its upper part is rotatably connected between the two contact plates of the disconnecting switch. A mounting hole is provided in the middle for rotatably connecting the connecting rod. A return spring is sleeved on the connecting rod, and its other end is rotatably connected to the top of the self-locking connector. The self-locking connector is a shaped plate with an oblique limiting slot at the top, and is rotatably connected between the two contact plates through the limiting slot. The bottom of the self-locking connector is threadedly connected to the insulating pull rod of the disconnecting switch. One end of the return spring abuts against the mounting hole in the middle of the hook plate, and the other end abuts against the connection between the connecting rod and the self-locking connector. The hook-like structure at the bottom of the hook plate is adjacent to one end of the pad of the disconnecting switch. After rotation, the hook plate hooks the pad and is tightly fixed. The movement of the insulating pull rod drives the self-locking connector to move, thereby realizing the self-locking or unlocking of the disconnecting switch.
[0007] Both the hook plate and the self-locking connector are connected between the two contact plates by a shaft pin structure, and bushings are provided on both sides of the hook plate for limiting the position.
[0008] The mounting holes in the middle of the hook plate are configured as an elongated slot and a square hole. The elongated slot is located on the outer side and communicates with the square hole on the inner side. A through hole is provided at one end of the connecting rod that connects to the hook plate. The connecting rod enters the square hole through the elongated slot. A cotter pin and a washer are placed in the through hole to connect the connecting rod to the hook plate.
[0009] The connection part between the connecting rod and the self-locking connector is a separate structure that is connected to the connecting rod body by a thread, and the connection part is connected to the self-locking connector by a shaft pin.
[0010] The self-locking device designed in this utility model has the following beneficial effects:
[0011] 1. The structure is simple and installed between the two contact plates. It is easy to operate and does not take up much space. When the disconnecting switch is closed, the hook plate and the pad form a tight self-lock. The clever connection between the hook plate, the connecting rod and the self-locking joint is not easy to disengage, which effectively prevents displacement between the contact plate and the stationary contact and long-term accumulation.
[0012] 2. Automatic closing and locking functions are achieved during the opening and closing of the disconnecting switch, making the product performance more stable. This solves the problem of the disconnecting switch automatically tripping due to electrodynamics when most pole-mounted high-voltage AC vacuum circuit breakers are tested for rated breaking current and closing peak current, thus providing higher reliability for the operation of pole-mounted high-voltage AC vacuum circuit breakers.
[0013] 3. Due to the small distance between the two contact plates of the T-type disconnector, a hook plate and a self-locking connector are designed to be connected between the two contact plates by means of a shaft pin. The connection method between the connecting rod and the hook plate and the self-locking connector has a small footprint. The design of the return spring allows the hook plate to return to its original position quickly. The bolt connection method makes it easy to adjust the initial position of the connecting rod and the self-locking connector to obtain a more precise self-locking effect, filling the gap in the self-locking device of the integrated T-type disconnector of the pole-mounted high-voltage AC vacuum circuit breaker. Attached Figure Description
[0014] Figure 1 This utility model's self-locking device structure diagram (with one side contact plate hidden);
[0015] Figure 2 Auxiliary view of the self-locking structure (one side touch panel is hidden);
[0016] Figure 3 Assembly drawing of integrated T-type disconnector for pole-mounted vacuum circuit breaker;
[0017] Figure 4 This is a schematic diagram of an integrated T-type disconnector for a pole-mounted vacuum circuit breaker. Detailed Implementation
[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:
[0019] like Figure 1-4 As shown, the self-locking device for the integrated T-type disconnector switch includes a hook plate 10, a connecting rod 12, a return spring 13, and a self-locking connector 11. The hook plate 10 is an irregularly shaped plate with a hook-like structure at the bottom, and its upper part is rotatably connected between the two contact plates 5 of the disconnector switch. A mounting hole is provided in its middle for rotatably connecting the connecting rod 12. The return spring 13 is sleeved on the connecting rod 12, and its other end is rotatably connected to the top of the self-locking connector 11. The self-locking connector 11 is an irregularly shaped plate structure, and its top is provided with an oblique limiting slot 11. 1. The self-locking connector 11 is rotatably connected between the two contact plates 5 through the limiting slot 111. The bottom of the self-locking connector 11 is threadedly connected to the insulating pull rod 3 of the disconnecting switch. One end of the return spring 13 abuts against the mounting hole in the middle of the hook plate 10, and the other end abuts against the connection between the connecting rod 12 and the self-locking connector 11. The hook-shaped structure at the bottom of the hook plate 10 is adjacent to one end of the disconnecting switch pad 6. After rotating the angle, the hook plate 10 hooks the pad 6 and is tightly fixed. The action of the insulating pull rod 3 drives the self-locking connector 11 to move, thereby realizing the self-locking or unlocking of the disconnecting switch.
[0020] In a preferred embodiment, both the hook plate 10 and the self-locking connector 11 are connected between the two contact plates 5 by a pin structure, and bushings are provided on both sides of the hook plate 10 for limiting the position.
[0021] In a preferred embodiment, the mounting hole in the middle of the hook plate 10 is configured as a long slot 101 and a square hole 102. The long slot 101 is located on the outer side and communicates with the square hole 102 on the inner side. A through hole 121 is provided at one end of the connecting rod 12 that is connected to the hook plate 10. The connecting rod 12 enters the square hole 102 through the long slot 101. A cotter pin is placed in the through hole 121 and a washer is provided to achieve the connection between the connecting rod 12 and the hook plate 10.
[0022] In a preferred embodiment, the connecting part 122 of the connecting rod 12 and the self-locking connector 11 is configured as a separate structure connected by threads to the main body of the connecting rod 12. The connecting part 122 and the self-locking connector 11 are connected by a pin, and the initial position of the connecting rod 12 is adjusted by tightening and loosening the threads.
[0023] In the specific implementation process, the reset spring 13 is sleeved on the connecting rod 12 and is coaxial with the connecting rod 12. In the relaxed state, its length is greater than that of the connecting rod 12. Its main function is to reset the hook plate 10.
[0024] The pole-mounted high-voltage AC vacuum circuit breaker integrated T-type disconnecting switch includes a base frame 1, post insulators 2, insulating rods 3, stationary contacts 4, contact plates 5, pads 6, and a main shaft 7. The base frame 1 is integrally installed and fixed to the pole-mounted high-voltage AC vacuum circuit breaker body through mounting holes. The main shaft 7 is installed on the base frame 1. The three-phase post insulators 2 are integrally installed on the base frame 1. Each set of post insulators 2 is fixedly provided with pads 6 and stationary contacts 4. The contact plates 5 are arranged in two opposite positions, one end of which is movably connected to the conductive clamps 8 of the pole-mounted high-voltage AC vacuum circuit breaker body, and the other end performs opening and closing actions under the linkage of the insulating rods 3. This utility model is installed between two contact plates 5. One end of the insulating pull rod 3 is movably connected to the crank arm on the main shaft 7 through a shaft pin structure, and the other end is connected to the contact plate 5 through a self-locking connector 11. The self-locking connector 11 is connected to the hook plate 10 through a connecting rod 12. The bottom of the hook plate 10 is provided with a hook-shaped structure that can hook the pad 6 and tighten it when rotating. By pulling the self-locking connector 11 through the insulating pull rod 3, the connecting rod 12 is driven, which in turn drives the hook plate 10 to move, so as to realize the self-locking and unlocking when the disconnecting switch is opened and closed.
[0025] Specifically, in practical applications, the pole-mounted high-voltage AC vacuum circuit breaker integrated disconnecting switch is equipped with a hand handle 9 on one side, which can realize the manual opening and closing operation of the integrated disconnecting switch.
[0026] In the specific installation and implementation process of this utility model, the hook plate 10 and the self-locking connector 11 are both fixed between the two contact plates 5 by a shaft pin. The hook plate 10 and the self-locking connector 11 are connected by a connecting rod 12. The self-locking connector 11 is threadedly connected to the insulating pull rod 3. The initial position of the self-locking connector 11 is adjusted by tightening and loosening the thread. The self-locking connector 11 is designed with an oblique limiting slot 111 and a round hole 112, respectively. The oblique limiting slot 111 is used to connect with the shaft pin of the contact plate 5, and the round hole 112 is used to connect with the shaft pin of the connecting rod 12. When the insulating pull rod 3 moves upward, the oblique limiting slot of the self-locking connector 11 slides along the shaft pin to complete the remaining distance in the hole, thereby driving the contact plate 5 to move upward, and at the same time driving the connecting rod 12 to pull the hook plate 10. The hook plate 10 is fixed between the two contact plates 5 by a shaft pin structure and can rotate around the shaft pin. Its hook-shaped tail end is adjacent to one end of the pad plate 6 and can hook one end of the pad plate 6 after rotating a certain angle. The return spring 13 is sleeved on the connecting rod 12. Under the action of the return spring 13, the hook-shaped tail end of the hook plate 10 is tightly fixed to one end of the pad plate 6. When the connecting rod 12 is pulled, the hook plate 10 rotates counterclockwise around the shaft pin, so that its hook-shaped tail end gradually separates from the pad plate 6. When the connecting rod 12 is reset, the hook plate 10 is reset under the action of the return spring 13.
[0027] With the circuit breaker closed, pull the integrated disconnect switch handle 9 to open the circuit. As the main shaft 7 rotates, the insulating pull rod 3 moves upward under the action of the crank arm, causing the self-locking connector 11 to slide along the shaft pin in the inclined limiting slot 111. After sliding through the inclined limiting slot 111, it pushes the contact plate 5 upward. The contact plate 5, under the upward force, begins to move clockwise along the conductive clamp 14, gradually disengaging from the stationary contact 4. At the same time, the connecting rod 12, along with the sliding of the self-locking connector 11, pulls the hook plate 10 to move counterclockwise along the shaft pin. As the rotation angle of the hook plate 10 increases, the hook-shaped tail end of the hook plate 10 gradually disengages from the pad 6, realizing the self-locking structure opening and unlocking.
[0028] When the circuit is closed, as the main shaft 7 rotates in the opposite direction, the insulating pull rod 3 moves downward under the action of the crank arm, causing the self-locking connector 11 to slide along the shaft pin. After sliding through the inclined limiting slot 111, the contact plate 5 is pulled downward. The contact plate 5 is subjected to downward force and begins to move counterclockwise along the conductive clamp 8. At the same time, as the self-locking connector 11 slides, the connecting rod 12 begins to move towards the hook plate 10. Due to the action of the spring 13, the hook plate 10 moves clockwise along the shaft pin. After sliding through the inclined limiting slot 111, the hook plate 10 rotates to the initial state. When the contact plate 5 falls, the hook plate 10 and the pad 6 engage tightly again, realizing the self-locking structure for closing and locking.
[0029] As can be seen from the structural design of the square hole 102 of the hook plate 10, the connecting rod 12 has a certain amount of room for movement in the square hole 102. After one end of the connecting rod 12 passes through the short side long slot 101 of the hook plate 10, the end of the connecting rod 12 with the through hole 121 is locked in the square hole 102 of the hook plate 10 by using a cotter pin and a washer. By tightening the thread of the connecting rod 12, the end of the connecting rod 12 in the square hole 102 is gradually locked (so that the washer is in close contact with one side of the short side long slot 101). During opening, as the self-locking connector 11 slides, the connecting rod 12 is pulled, which in turn unlocks the hook plate 10. During closing, the connecting rod 12 moves towards the hook plate 10, and the hook plate 10 gradually returns to its initial state. When closing is almost complete, the hook-shaped tail end of the hook plate 10 touches the pad 6 and rotates counterclockwise. At this time, the square hole 102 of the hook plate 10 provides extension space for the connecting rod 12. As closing continues, after the hook-shaped tail end exceeds the pad 6, the hook plate 10 returns to its original position under the force of the return spring 13, hooking the pad 6. After closing, the hook plate 10 is held in place by the force of the return spring 13, and the connecting rod 12 is not subjected to force. The advantage of this structural design is that it prevents the rigid connection of the self-locking device components from causing damage to the components.
[0030] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.
Claims
1. A self-locking device for a pole-disconnection integrated T-type disconnector, characterized in that, The device includes a hook plate (10), a connecting rod (12), a return spring (13), and a self-locking connector (11). The hook plate (10) is a shaped plate with a hook-shaped structure at the bottom. Its upper part is rotatably connected between the two contact plates (5) of the disconnect switch. The middle part is provided with a mounting hole for rotatably connecting the connecting rod (12). The connecting rod (12) is fitted with a return spring (13), and its other end is rotatably connected to the top of the self-locking connector (11). The self-locking connector (11) is a shaped plate structure with an oblique limiting slot (111) at its top, and the limiting slot (111) is used to connect the self-locking connector to the top of the connecting rod. 1) Rotatably connected between the two contact plates (5), the bottom of the self-locking connector (11) is threadedly connected to the insulating pull rod (3) of the disconnecting switch, one end of the reset spring (13) abuts against the mounting hole in the middle of the hook plate (10), and the other end abuts against the connection between the connecting rod (12) and the self-locking connector (11). The hook-shaped structure at the bottom of the hook plate (10) is adjacent to one end of the disconnecting switch pad (6). After rotating the angle, the hook plate (10) hooks the pad (6) and is tightly fixed. The self-locking connector (11) is driven to move by the action of the insulating pull rod (3) to realize the self-locking or unlocking of the disconnecting switch.
2. The self-locking device for the pole-disconnection integrated T-type isolating switch according to claim 1, characterized in that, The hook plate (10) and the self-locking connector (11) are connected between the two contact plates (5) by a shaft pin structure. The hook plate (10) is provided with bushings on both sides for limiting the position.
3. The self-locking device for the pole-disconnection integrated T-type isolating switch according to claim 1, characterized in that, The mounting hole in the middle of the hook plate (10) is configured as a long slot (101) and a square hole (102). The long slot (101) is located on the outside and communicates with the square hole (102) on the inside. The end of the connecting rod (12) connected to the hook plate (10) is provided with a through hole (121). The connecting rod (12) enters the square hole (102) through the long slot (101). A cotter pin is placed in the through hole (121) and a washer is provided to realize the connection between the connecting rod (12) and the hook plate (10).
4. The self-locking device for the pole-disconnection integrated T-type isolating switch according to claim 1, characterized in that, The connecting part (122) of the connecting rod (12) and the self-locking connector (11) and the main body of the connecting rod (12) are configured as a split structure connected by threads, and the connecting part (122) and the self-locking connector (11) are connected by a shaft pin.