Self-locking GW1-12 type isolating switch

Abstract

The utility model discloses a self-locking GW1-12 type disconnecting switch, which relates to the field of power system application equipment and comprises a disconnecting switch body, the disconnecting switch body is further provided with a fixing block, a limiting bolt and a positioning bolt, the fixing block is arranged at the top of a post insulator where a static contact is located and forms an integrated structure with the static contact, and the limiting bolt is arranged on the fixing block. The connecting end of the contact knife and the static contact is pivoted with the static contact through the fixing block, the limiting bolt is arranged on the stainless steel sleeve at the connecting position of the main shaft and the base, the positioning bolt is arranged on the base adjacent to the connecting position of the main shaft and the base, and the limiting bolt and the positioning bolt are matched with each other. And the limiting bolt can be clamped on the positioning bolt after rotating by an angle. When the isolating switch is opened, the main shaft crank arm passes a'dead point ', so that the isolating switch can stably stay at a disconnection position after being opened and is not easy to generate misoperation or automatically close due to interference of external factors, and the safety, the stability and the reliability of the operation of the isolating switch are improved.

Description

Technical Field

[0001] The utility model relates to the field of power system application equipment, in particular to a self-locking GW1-12 type isolating switch. Background Art

[0002] Disconnectors (also known as "knife switches") generally refer to high-voltage disconnectors, primarily used in outdoor AC 10-40.5kV, 50Hz power systems to switch live high-voltage lines and electrically isolate them from the high-voltage busbars or circuit breakers being repaired. Disconnectors lack arc extinguishing capabilities and can only open and close circuits under no-load current conditions. Disconnectors are widely used in industries such as power generation, railways, mining, and oil fields. Their operating principle and structure are relatively simple, but due to their high usage and the high reliability requirements, their stability and reliability are crucial to the design, construction, and safe operation of substations and power plants.

[0003] The existing high-voltage disconnector includes: two insulating pillars fixed vertically on the mounting plate, with moving and static contacts fixed on the insulating pillars respectively, and wiring terminals corresponding to the moving and static contacts are also provided on the two insulating pillars, among which the first wiring terminal is connected to the moving contact, and the second wiring terminal is connected to the static contact. Two contact plates are connected in parallel between the two contacts, one end of the two contact plates is hinged to the static contact, and the other end can be closed or separated with the moving contact.

[0004] When the GW1-12 disconnector is open, the main operating shaft arm on the base rotates counterclockwise, forming an angle of approximately 135° with the insulating rod, without passing through a "dead point" (where the insulating rod and the main operating shaft arm are aligned). If this point is not passed, and the vertical drive shaft, horizontal rod, or connecting rod of the disconnector loosens or breaks, the weight or elastic force of the conductive plate, as well as external wind forces, could cause the disconnector's moving contact to move too close to the stationary contact after opening. This could lead to insufficient insulation distance between the moving contact and the energized stationary contact, causing arcing between the moving and static contacts and potentially causing an accident. Summary of the Invention

[0005] In order to solve the above-mentioned problems, the utility model provides a self-locking GW1-12 type disconnector. When the disconnector is opened, the main shaft arm passes through the "dead point", ensuring that the disconnector can stay stably in the disconnected position after opening, and is not easily disturbed by external factors and malfunctions or automatic closures, thereby reducing the risk of accidents and improving the safety, stability and reliability of the disconnector operation.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:

[0007] A self-locking GW1-12 type disconnector includes an disconnector body, which is composed of three single-pole switches of the same structure. Each single-pole switch includes a base, a support insulator, a static contact, a moving contact, a contact blade, a main shaft, a main shaft crank arm, an insulating pull rod and an operating mechanism. Two support insulators are fixed in parallel on the base, and the tops of the two support insulators are respectively connected to the static contact and the moving contact through a terminal block. One end of the insulating pull rod is movably connected to the contact blade, and the other end is connected to the vertical connecting rod of the operating mechanism through the main shaft crank arm and the main shaft. One end of the contact blade is hingedly connected to the static contact, and the other end is driven by the operating mechanism to close or separate with the moving contact to realize the closing or opening of the disconnector. The disconnector body is also provided with a fixing block, a limit bolt and a positioning bolt. The block is arranged at the top of the support insulator where the static contact is located and forms an integrated structure with the static contact. The connecting end of the contact knife and the static contact is pivotally connected to the static contact through a fixed block. The limit bolt is arranged on the stainless steel sleeve at the connection between the main shaft and the base. The positioning bolt is arranged on the base adjacent to the connection between the main shaft and the base. The limit bolt and the positioning bolt are adapted to each other. The limit bolt can be clamped on the positioning bolt after rotating the angle. When the disconnector is opened, the operating mechanism drives the main shaft to rotate through the vertical connecting rod, thereby driving the insulating pull rod to push the contact knife upward to leave the moving contact. The main shaft crank arm continues to rotate counterclockwise under the drive of the operating mechanism until it is in a straight line with the joint of the insulating pull rod and forms a 30° angle. The limit bolt is clamped on the positioning bolt to form a self-locking, and the disconnector is in place.

[0008] A limit bracket is provided at the connection between the moving contact and the wiring seat, and the limit bracket is used to limit the movement range of the contact knife.

[0009] The surfaces of the static contact and the moving contact are both provided with a tin-plated layer, and a graphite silver-plated coating is provided on the contact area.

[0010] The effectiveness of this utility model is reflected in the following aspects:

[0011] 1) Through the pivotal connection between the contact blade, the static contact, and the fixed block, the auxiliary device that cooperates with the positioning bolt and the limit bolt, and the operational improvement of the operating mechanism, the main shaft arm can smoothly "pass the dead point" during the movement of the contact blade during the opening process. This allows the contact blade and the static contact to be completely separated during the opening process, thereby completely disconnecting the circuit and effectively avoiding arcing or short circuits that may be caused by minor contact;

[0012] 2) It ensures that the power switch can stay in the open position stably after opening, and is not easily disturbed by external factors and malfunctions or automatic closing, greatly reducing the risk of accidents caused by disconnector failure;

[0013] 3) During the opening process, the main shaft arm passing the dead point helps to enhance the self-locking performance of the mechanism. Even under the action of external force, the disconnector can maintain the disconnected state. The improvement of the self-locking performance enhances the stability and reliability of the disconnector, ensures the safe, stable and efficient operation of the power system, and improves the overall performance and maintenance convenience of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the main part of the utility model;

[0015] Figure 2 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1-2 As shown, the self-locking GW1-12 type disconnector includes an disconnector body, which is composed of three single-pole switches with the same structure. Each single-pole switch includes a base 1, a support insulator 2, a static contact 3, a moving contact 4, a contact blade 5, a main shaft 6, a main shaft crank arm 7, an insulating pull rod 8 and an operating mechanism 9. Two support insulators 2 are fixed in parallel on the base 1. The tops of the two support insulators 2 are respectively connected to the static contact 3 and the moving contact 4 through a terminal block. One end of the insulating pull rod 8 is movably connected to the contact blade 5, and the other end is connected to the vertical connecting rod of the operating mechanism 9 through the main shaft crank arm 7 and the main shaft 6. One end of the contact blade 5 is hingedly connected to the static contact 3, and the other end is driven by the operating mechanism 9 to close or separate from the moving contact 4 to realize the closing or opening of the disconnector. The disconnector body is also provided with a fixed block 12, a limit bolt 13 and a positioning bolt 14. The fixed block 12 is set At the top of the support insulator 2 where the static contact 3 is located and forming an integrated structure with the static contact 3, the connection end of the contact blade 5 and the static contact 3 is pivotally connected to the static contact 3 through a fixed block 12, and the limit bolt 13 is arranged on the stainless steel sleeve at the connection between the main shaft 6 and the base 1, and the positioning bolt 14 is arranged on the base 1 adjacent to the connection between the main shaft 6 and the base 1, the limit bolt 13 and the positioning bolt 14 are adapted to each other, and the limit bolt 13 can be clamped on the positioning bolt 14 after the rotation angle is reached. When the disconnector is opened, the operating mechanism 9 drives the main shaft 6 to rotate through the vertical connecting rod, thereby driving the insulating pull rod 8 to push the contact blade 5 upward to leave the moving contact 4, and the main shaft crank arm 7 continues to rotate counterclockwise under the drive of the operating mechanism 9 until it is in a straight line with the joint 11 of the insulating pull rod 8 and then forms a 30° angle. The limit bolt 13 is clamped on the positioning bolt 14 to form a self-locking, and the disconnector is in place.

[0018] As a preferred method, in this embodiment, a limit bracket 10 is provided at the connection between the moving contact 4 and the terminal block. The limit bracket 10 is used to limit the movement range of the contact blade 5 so that it is in full contact with the moving contact 4, ensuring that the isolating switch will not be prevented from continuing to move due to external force or vibration.

[0019] As a preferred manner, in this embodiment, the surfaces of the static contact 3 and the movable contact 4 are both provided with a tin-plated layer, and a graphite silver-plated coating is provided in the contact area, thereby improving the conductivity and stability of the disconnector.

[0020] The specific implementation process of this utility model is as follows:

[0021] When the disconnector is opened, the operating mechanism 9 drives the vertical connecting rod and the main shaft 6, causing the insulating rod 8 to move upward. When the insulating rod 8 and the main shaft crank arm 7 are aligned (the "dead point" position), the operating mechanism 9 continues to operate, driving the main shaft crank arm 7 to continue rotating counterclockwise (past the "dead point"), gradually reducing the angle between the insulating rod 8 and the main shaft crank arm 7 until it forms an angle of approximately 30° with the joint 11 of the insulating rod 8. At this point, the limit bolt 13 is precisely locked on the positioning bolt 14, ensuring that even if the insulating rod 9 is affected by gravity, it will not move downward. The disconnector is completely disconnected and is less likely to close accidentally, greatly enhancing the stability and reliability of the disconnector. In the present invention, the pivotal connection between the contact blade 5 and the fixed block 12 enables the insulating pull rod 8 to smoothly pass the "dead point" under the drive of the operating mechanism 9. The design of the limit bolt 13 and the positioning bolt 14 improves the self-locking performance of the mechanism. The position and distance setting between the two are calculated based on the final angle of 30° between the joint 11 of the insulating pull rod 8 and the main shaft arm 7, so that the disconnector can be accurately contacted and locked during the opening process. This part of the content can be obtained by those skilled in the art through measurement and will not be described in detail.

[0022] When the disconnector is closed, the unlocking mechanism is activated by reversing the operation of the operating mechanism 9. To close the disconnector, the operating mechanism 9 drives the vertical connecting rod and the main shaft 6 in reverse motion, gradually moving the main shaft crank arm 7 away from the limit bolt 13. During this process, the contact pressure between the limit bolt 13 and the positioning bolt 14 gradually decreases until they are completely separated. Simultaneously, the insulating pull rod 8, driven by the connecting rod mechanism, gradually moves downward, gradually increasing the angle between it and the main shaft crank arm 7 until it returns to its initial position (i.e., an angle of 135°). This completes the transition from open to closed, and the unlocking mechanism is also complete.

[0023] To sum up, the self-locking isolating switch proposed in the present invention ensures that the main shaft crank arm 7 passes the "dead point" smoothly when opening the switch, thereby enhancing the self-locking performance of the mechanism. Even under the action of external force, the isolating switch can remain in a completely disconnected state and is not prone to accidental closure. At the same time, because the contact knife 5 can reach the disconnected position smoothly and stably, the additional load caused by sticking or excessive resistance is avoided, and the impact and wear of the isolating switch on the inside of the mechanism during the opening process are reduced, thereby improving the safety, stability and reliability of the isolating switch operation, optimizing the operating performance and maintenance convenience, and improving the overall performance of the system.

[0024] 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 technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A self-locking GW1-12 type disconnector, comprising an disconnector body, wherein the disconnector body is composed of three single-pole switches of the same structure, each single-pole switch comprising a base (1), a support insulator (2), a static contact (3), a moving contact (4), a contact blade (5), a main shaft (6), a main shaft crank arm (7), an insulating pull rod (8) and an operating mechanism (9), wherein two support insulators (2) are fixedly arranged in parallel on the base (1), and the tops of the two support insulators (2) are respectively connected to the static contact (3) and the moving contact (4) through a terminal block, one end of the insulating pull rod (8) is movably connected to the contact blade (5), and the other end is connected to the vertical connecting rod of the operating mechanism (9) through the main shaft crank arm (7) and the main shaft (6), one end of the contact blade (5) is hingedly connected to the static contact (3), and the other end is driven by the operating mechanism (9) to close or separate with the moving contact (4) to realize the closing or opening of the disconnector, characterized in that The isolating switch body is further provided with a fixing block (12), a limiting bolt (13) and a positioning bolt (14), wherein the fixing block (12) is provided on the top of the support insulator (2) where the static contact (3) is located and forms an integral structure with the static contact (3), the connecting end of the contact blade (5) and the static contact (3) is pivotally connected to the static contact (3) through the fixing block (12), the limiting bolt (13) is provided on the stainless steel sleeve at the connection between the main shaft (6) and the base (1), the positioning bolt (14) is provided on the base (1) adjacent to the connection between the main shaft (6) and the base (1), and the limiting bolt (1 3) It is adapted to the positioning bolt (14), and the limiting bolt (13) can be clamped on the positioning bolt (14) after being rotated at an angle. When the disconnector is opened, the operating mechanism (9) drives the main shaft (6) to rotate through the vertical connecting rod, thereby driving the insulating pull rod (8) to push the contact knife (5) upward to leave the moving contact (4). The main shaft crank arm (7) continues to rotate counterclockwise under the drive of the operating mechanism (9) until it forms a straight line with the joint of the insulating pull rod (8) and forms an angle of 30°. The limiting bolt (13) is clamped on the positioning bolt (14) to form a self-locking state, and the disconnector is opened in place.

2. A self-locking GW1-12 type disconnector according to claim 1, characterized in that: A limiting bracket (10) is provided at the connection between the moving contact (4) and the wiring seat, and the limiting bracket (10) is used to limit the movement range of the contact knife (5).

3. A self-locking GW1-12 type disconnector according to claim 1, characterized in that: The surfaces of the static contact (3) and the movable contact (4) are both provided with a tin-plated layer, and a graphite silver-plated coating is provided in the contact area.

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