Mechanical locking device for GW1 single-ground isolating switch

Abstract

This utility model discloses a mechanical interlocking device for a GW1 type single-grounding disconnector, relating to the field of power system application equipment. The mechanical interlocking device includes a grounding switch shaft crank arm, a locking connector, a locking rod, a connecting connector, and a main shaft crank arm. One end of the grounding switch shaft crank arm is connected to the grounding switch shaft and rotates with it; the other end is connected to the locking rod via the locking connector. One end of the main shaft crank arm is connected to the main shaft and rotates with it; the other end is connected to the other end of the locking rod via the connecting connector. The locking rod is a threaded rod with threads at both ends; one end is threadedly connected to the connecting connector. The locking connector is mounted on a base and rotatably connected thereto. The end of the connector connected to the locking rod has a long slot with an internal thread. The mechanical interlocking of the grounding switch and the main shaft is achieved by limiting the positions of the locking connector and the locking rod. This utility model improves the safety and reliability of power equipment operation and avoids safety accidents caused by misoperation.

Description

Technical Field

[0001] This utility model relates to the field of power system application equipment, specifically a mechanical interlocking device for a GW1 type single grounding disconnect switch. Background Technology

[0002] The GW1 type disconnecting switch, a double-column vertical opening single-break disconnecting switch, consists of three interconnected single-stage components, mainly including a base frame, post insulators, moving / stationary contacts, conductive contacts, grounding switch, and operating mechanism. It is widely used in power systems, playing a crucial role in isolating power sources and performing switching operations. However, in actual operation, due to operator error, the disconnecting switch may be opened or closed while the grounding switch is closed. Such misoperation can easily lead to serious safety accidents, such as short-circuit faults, posing a significant threat to the safe and stable operation of the power system and endangering the lives of operators. Currently, existing GW1 type disconnecting switches have certain shortcomings in preventing such misoperations, lacking an effective mechanical interlocking device to prevent the disconnecting switch from being opened or closed when the grounding switch is closed. Summary of the Invention

[0003] To address the aforementioned technical problems, this utility model provides a mechanical interlocking device for a GW1 type single-grounding disconnector, which realizes forced interlocking and state interlocking between the main shaft switch and the grounding switch of the disconnector, improves the safety and reliability of power equipment operation, and avoids safety accidents caused by misoperation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A mechanical interlocking device for a GW1 type single grounding disconnector includes a grounding shaft crank arm, a locking connector, a locking rod, a connecting connector, and a main shaft crank arm. One end of the grounding shaft crank arm is connected to the grounding shaft and rotates with it, while the other end is connected to the locking rod via the locking connector. One end of the main shaft crank arm is connected to the main shaft and rotates with it, while the other end is connected to the other end of the locking rod via the connecting connector. The locking rod is configured as a screw with threads at both ends, with one end threadedly connected to the connecting connector. The locking connector is mounted on a base and rotatably connected thereto, with an elongated slot and internal threads at the end connected to the locking rod. The mechanical interlocking of the grounding switch and the main shaft is achieved by limiting the positions of the locking connector and the locking rod.

[0006] The depth of the long slot of the locking joint is set to 15mm±0.1mm, and the two sides of the slot are chamfered at 15°±1°.

[0007] The main spindle crank arm and the connecting joint, as well as the ground tool shaft crank arm and the locking joint, are all connected by pivot pins.

[0008] The shaft pin is made of 40Cr material with surface strengthening treatment and a hardness set to HRC58-62.

[0009] This utility model has the following technical effects:

[0010] 1. Based on the characteristics of the GW1 type single grounding disconnect switch, a mechanical interlocking device was designed. It has a simple structure, requires no external power supply or complex logic control, and is particularly suitable for substations, power distribution networks and other occasions with strict requirements for operational integrity. It has extremely high engineering application value.

[0011] 2. When the grounding switch is closed, the interlocking device automatically locks the operating mechanism of the disconnecting switch, physically blocking the opening and closing action of the main shaft switch of the disconnecting switch, thus achieving forced interlocking. Only when the grounding switch is fully opened will the interlocking device release the main shaft switch operating authority, thus achieving state interlocking.

[0012] 3. From a mechanical perspective, it eliminates the possibility of misoperation of the main switch when the grounding switch is closed, eliminating the need to rely on electrical interlocks or human judgment, avoiding short circuit faults caused by misoperation, significantly improving the safety and reliability of the disconnecting switch operation, and effectively protecting the personal safety of operators. Attached Figure Description

[0013] Figure 1 This is an enlarged schematic diagram of the locking device structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the main blade closing structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the main blade tripping structure of this utility model;

[0016] Figure 4 This is a top view of the overall structure of this utility model. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0018] like Figure 1As shown, the mechanical interlocking device for a GW1 type single grounding disconnector includes a grounding shaft crank arm 1, a locking connector 2, a locking rod 3, a connecting connector 4, and a main shaft crank arm 5. One end of the grounding shaft crank arm 1 is connected to the grounding shaft 6 and rotates with it, while the other end is connected to the locking rod 3 through the locking connector 2. One end of the main shaft crank arm 5 is connected to the main shaft 7 and rotates with it, while the other end is connected to the other end of the locking rod 3 through the connecting connector 4. The locking rod 3 is a screw with threads at both ends, one end of which is threaded to the connecting connector 4. The locking connector 2 is mounted on the base 8 and rotatably connected to it. The end of the locking connector 2 connected to the locking rod 3 is provided with a long slot 21 and has an internal thread. The mechanical interlocking between the grounding blade and the main blade is achieved by limiting the position of the locking connector 2 and the locking rod 3.

[0019] As a preferred embodiment, in this embodiment, the depth of the long slot 21 of the locking connector 2 is set to 15mm±0.1mm, and the two sides of the slot are provided with a chamfer of 15°±1°.

[0020] In a preferred embodiment, the spindle crank arm 5 and the connecting joint 4, and the ground tool shaft crank arm 1 and the locking joint 2 are all connected by pivot pins.

[0021] Specifically, in this embodiment, the shaft pin is made of 40Cr material with surface strengthening treatment and a hardness set to HRC58-62, which has high strength and durability, ensuring the stability and reliability of the locking structure.

[0022] like Figure 2-4 As shown, the GW1 type single grounding switch includes a disconnecting switch body, which is composed of three identical single-pole switches connected together. Each single-pole switch includes a base 8, post insulators 9, stationary contact 10, contact blade 11, moving contact 12, insulating pull rod 13, main shaft 7, grounding switch stationary contact 14, grounding switch 15, grounding switch shaft 6, main shaft crank arm 5, grounding switch shaft crank arm 1, and operating mechanism. Two post insulators 9 are fixedly arranged side by side on the base 8. The top of the two post insulators 9 is connected to the main blade part, and the grounding switch part is connected to one side of the base 8. The opening and closing operation of the disconnecting switch is realized by driving the insulating pull rod 13 through the operating mechanism.

[0023] In this invention, the locking structure 2 adopts a slot-type mechanical interface design. Through precise tolerance matching and geometric optimization, a reliable connection between the ground tool shaft crank arm 1 and the locking joint 2 is achieved. The connecting pin is precision ground, with a surface roughness controlled below Ra0.8, and undergoes surface strengthening treatment processes such as nitriding or hard chrome plating. This effectively reduces the coefficient of friction while significantly enhancing the wear resistance and corrosion resistance of the pin surface, ensuring flexible and unhindered rotation between components and maintaining stable connection performance under long-term alternating load conditions.

[0024] During operation, when the disconnecting switch is in the main switch closed state and the grounding switch open state, the rotation center of the grounding switch shaft crank arm 1 and the elongated slot 21 of the locking connector 2 form a precise positional constraint relationship. The beveled head of one end of the locking rod 3 forms a self-guiding shape with the chamfer of the elongated slot 21, ensuring accurate engagement. After reaching the correct position, the bottom surface gap is ≤0.1mm, achieving zero-gap locking. At this time, even if the operating mechanism malfunctions and attempts to close the grounding switch 15, the grounding switch shaft 6 cannot drive the grounding switch 15 to move clockwise because the grounding switch shaft crank arm 1 is stuck in the elongated slot 21, thus effectively preventing the grounding switch from being malfunctioning.

[0025] When the disconnector switch's main blade opens and the grounding switch closes, the grounding switch shaft crank arm 1 rotates into the long slot 21 of the locking connector 2. Utilizing the geometric limit and mechanical interference principle of the slot, the rotational freedom of the grounding switch shaft crank arm 1 is completely constrained. Due to its mechanical coupling with the main shaft 7, it mechanically restricts the rotation of the main shaft 7, preventing the contact knife 11 from performing a clockwise closing operation under the action of the operating structure, thus achieving a reliable mechanical locking function. Even if the operating mechanism 16 continuously applies driving torque, the reaction torque on the main shaft 7 will completely offset the driving torque under the rigid constraint of the mechanical structure, effectively preventing the main blade from malfunctioning.

[0026] When the ground switch is opened, the locking joint 2 rotates in the opposite direction, which drives the locking rod 3 to move the ground switch shaft crank arm 1 out of the long slot 21. At this time, the long slot 21 no longer constrains the ground switch shaft crank arm 1, the movement restriction of the main shaft 7 is released, and the contact knife 11 can complete the normal opening and closing operation under the drive of the operating structure.

[0027] 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 mechanical interlocking device for a GW1 type single-grounded disconnecting switch, characterized in that, The mechanical locking device includes a grounding shaft crank arm (1), a locking joint (2), a locking rod (3), a connecting joint (4), and a main shaft crank arm (5). One end of the grounding shaft crank arm (1) is connected to the grounding shaft (6) and rotates with it, while the other end is connected to the locking rod (3) through the locking joint (2). One end of the main shaft crank arm (5) is connected to the main shaft (7) and rotates with it, while the other end is connected to the other end of the locking rod (3) through the connecting joint (4). The locking rod (3) is a screw with threads at both ends, and one end is threaded to the connecting joint (4). The locking joint (2) is set on the base (8) and rotatably connected to it. The end of the locking joint (2) connected to the locking rod (3) is provided with a long slot (21) and has an internal thread. The mechanical interlock between the grounding tool and the main tool is achieved by limiting the position of the locking joint (2) and the locking rod (3).

2. The mechanical interlocking device for a GW1 type single-grounding disconnector according to claim 1, characterized in that, The depth of the long slot (21) of the locking connector (2) is set to 15mm±0.1mm, and the two sides of the slot are chamfered at 15°±1°.

3. A mechanical interlocking device for a GW1 type single-grounding disconnector according to claim 1, characterized in that, The main spindle crank arm (5) and the connecting joint (4), and the ground tool shaft crank arm (1) and the locking joint (2) are all connected by shaft pins.

4. A mechanical interlocking device for a GW1 type single-grounding disconnector according to claim 3, characterized in that, The shaft pin is made of 40Cr material with surface strengthening treatment and a hardness set to HRC58-62.

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