Double-fracture upper isolation device

Abstract

A double-fracture upper isolation device comprises a shell, a driving main shaft, a plurality of vacuum arc extinguish chambers, an isolation upper contact frame and a grounding cross beam are arranged in the shell, a movable knife rest is arranged on the driving main shaft, the movable knife rest comprises a driving plate fixedly matched with the driving main shaft in a sleeved mode, the driving plate is connected with straight knife plates arranged at intervals, and the straight knife plates are connected with the vacuum arc extinguish chambers. The straight knife board comprises a connecting part and butt joint parts arranged at the two ends of the connecting part, the connecting part and the butt joint parts form a gap used for being in butt joint with an isolation upper contact frame or a vacuum arc-extinguishing chamber or a grounding cross beam, and the connecting part is a straight board which is arranged at 180 degrees. By separately arranging the isolation upper static contact, the isolation lower contact and the grounding static contact on different insulators, the problems of creepage and insulation degradation can be effectively reduced, so that the insulation reliability is improved, and the common isolation false fracture phenomenon in the traditional isolation switch is avoided.

Description

Technical Field

[0001] This utility model relates to a double-break upper isolation device, belonging to the field of gas-insulated ring network switch electrical components. Background Technology

[0002] A disconnecting switch is a device used in a circuit to connect, isolate, and switch the current connection between a live conductor and an electrical appliance. In existing disconnecting switches, the upper isolating contact, lower isolating contact, and grounding contact are all located on the same insulator, which easily leads to creepage and insulation degradation, resulting in poor insulation reliability. This is known in the industry as the "false break" phenomenon, which this invention effectively solves. Furthermore, the rotating blade is usually designed with a bent arc, resulting in a large lever arm during rotation, making it inconvenient to manufacture and prone to damage, causing inconvenience in production and use. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a double-break upper isolation device.

[0004] A double-break upper isolation device includes a housing. Inside the housing are a drive spindle, several vacuum interrupters, an upper isolation contact frame, and a grounding beam. A movable tool holder is mounted on the drive spindle. The movable tool holder includes a drive plate fixedly fitted to the drive spindle. The drive plate is connected to spaced-apart straight blades. Each straight blade includes a connecting portion and mating portions at both ends of the connecting portion. The connecting portion and the mating portions form a gap for mating with the upper isolation contact frame, vacuum interrupters, or grounding beam. The connecting portion is a straight plate set at 180°. By separating the upper isolation contact, lower isolation contact, and grounding stationary contact onto different insulators, creepage and insulation degradation problems can be effectively reduced, thereby improving insulation reliability and avoiding the false break phenomenon common in traditional disconnect switches. The use of straight blades instead of traditional bent arc blades reduces the lever arm generated during rotation, resulting in a simpler mechanical structure, easier processing, and material savings. It also reduces the risk of blade damage during operation, thereby improving product durability.

[0005] Preferably, the connection angle between the mating part and the connecting part is an acute angle. The acute angle design allows the mating part to form a tighter fit when it connects with the isolation upper contact frame, vacuum interrupter, or grounding crossbeam, increasing the contact pressure between the contact surfaces, thereby improving conductivity and contact stability, reducing contact resistance, and ensuring the stability of current during transmission.

[0006] Furthermore, the connection angle between the mating part and the connecting part is less than 10°. When the connection angle is less than 10°, the applied force can be transmitted more directly to the mating part, avoiding the dispersion or loss of force caused by an excessively large angle, thereby improving the mechanical efficiency and response speed of the switch.

[0007] Preferably, the drive plate extends into the gap between the connecting parts and is fixedly connected to the connecting parts by bolts; limit plates are fixedly connected to both sides of the drive plate, and the ends of the limit plates are provided with limit protrusions that abut against the connection points of the connecting parts and the mating parts. The abutment surfaces of the limit protrusions and the connection points of the connecting parts and the mating parts are arc-shaped. The design of the limit plates and their limit protrusions effectively restricts the relative movement between the connecting parts and the mating parts, ensuring that the switch maintains a precise mating position during operation, thus improving the operating accuracy and consistency of the switch. The arc-shaped design effectively disperses the force, reducing local stress concentration at the connection point while bearing the force, which helps to reduce the friction area and wear, and reduces wear caused by frequent operation.

[0008] Furthermore, the drive plate and the limiting plate are arranged in a triangle. A triangular design typically reduces material usage while maintaining strength, resulting in a lighter overall device. The mutual support between the base and the two sides of the triangle structure creates greater structural rigidity.

[0009] Preferably, the housing includes side plates on both sides, a front plate and a rear plate fixed between the side plates, and an arc-extinguishing chamber bracket fixedly installed outside the vacuum arc-extinguishing chamber. The vacuum arc-extinguishing chamber is fixed between the front plate and the rear plate by the arc-extinguishing chamber bracket. The independent arc-extinguishing chamber bracket design makes the installation and disassembly of the vacuum arc-extinguishing chamber more convenient, and provides good inter-electrode insulation, allowing the switch's inter-electrode operation to be independent.

[0010] Furthermore, the arc-extinguishing chamber support includes fixing blocks on both the front and rear sides. The front and rear plates are provided with fixing holes, and the front and rear plates are fixedly connected to the arc-extinguishing chamber support via bolts to the fixing blocks through these fixing holes. The bolt connection between the fixing blocks and the front and rear plates forms a robust mechanical connection, effectively withstanding dynamic and static loads during operation, improving the overall structure's compressive strength, and preventing loosening or detachment during long-term operation.

[0011] Furthermore, the arc-extinguishing chamber support is made of insulating material. Insulating material effectively limits high-potential charged bodies, reduces the influence range of the high-voltage electric field, and ensures the safe operation of the equipment under high voltage, thereby protecting the safety of operators and the equipment itself. During maintenance, connecting one end of the straight blade plate to ground and the other end to the vacuum arc-extinguishing chamber achieves the purpose of insulated maintenance, ensuring personnel safety.

[0012] Preferably, the top of the vacuum interrupter is connected to a stationary contact extending from the interrupter support, the stationary contact being used to connect with the straight blade plate to form a current connection circuit.

[0013] Preferably, the upper isolating stationary contact corresponding to the position of the vacuum interrupter is fixedly provided on the isolating upper contact frame, and the grounding stationary contact corresponding to the position of the vacuum interrupter is fixedly provided on the grounding crossbeam.

[0014] The beneficial effects of this utility model are as follows: By separating the upper isolating contact, lower isolating contact, and grounding contact onto different insulators, the problems of creepage and insulation degradation can be effectively reduced, thereby improving insulation reliability and avoiding the false break phenomenon commonly found in traditional disconnect switches. The use of a straight blade plate instead of the traditional bent arc blade plate reduces the lever arm generated during rotation, making the mechanical structure simpler, easier to manufacture, and saving materials. It also reduces the risk of blade plate damage during operation, thereby improving product durability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a structural diagram of the main body of this utility model;

[0017] Figure 2 This is a structural diagram of the present invention with one side plate removed;

[0018] Figure 3 This is a structural diagram of the moving tool holder of this utility model;

[0019] In the diagram, 1. Housing; 11. Side plate; 12. Front plate; 13. Rear plate; 14. Fixing hole; 2. Drive spindle; 3. Vacuum interrupter; 31. Stationary contact; 4. Interrupter support; 41. Fixing block; 5. Isolation upper contact frame; 51. Upper isolation stationary contact; 6. Grounding crossbeam; 61. Grounding stationary contact; 7. Moving knife holder; 71. Drive plate; 72. Limiting plate; 721. Limiting protrusion; 73. Straight knife plate; 731. Connecting part; 732. Butt joint; 733. Gap. Detailed Implementation

[0020] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0021] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0022] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0023] like Figure 1-3 The diagram illustrates an embodiment of a double-break upper isolation device according to this invention. It includes a housing 1, within which a drive spindle 2, several vacuum interrupters 3, an upper isolation contact frame 5, and a grounding beam 6 are housed. The drive spindle 2 is equipped with a moving blade holder 7, which includes a drive plate 71 fixedly fitted to the drive spindle 2. The drive plate 71 is connected to spaced-apart straight blade plates 73. Each straight blade plate 73 includes a connecting portion 731 and mating portions 732 at both ends of the connecting portion 731. The connecting portion 731 and the mating portion 732 form a gap 733 for mating with the upper isolation contact frame 5, the vacuum interrupters 3, or the grounding beam 6. The connecting portion 731 is a straight plate with a 180° angle. By separating the upper isolation contact, lower isolation contact, and grounding contact 31 onto different insulators, creepage and insulation degradation problems can be effectively reduced, thereby improving insulation reliability and avoiding the false break phenomenon common in traditional disconnect switches. The design of the straight blade plate 73 replaces the traditional bent arc blade plate, which reduces the lever arm generated during rotation, making the mechanical structure simpler, easier to process, and saving materials. It also reduces the risk of damage to the blade plate during operation, thereby improving the durability of the product.

[0024] The connection angle between the docking part 732 and the connecting part 731 is an acute angle. The acute angle design allows the docking part 732 to form a tighter fit when docking with the isolation upper contact frame 5, the vacuum interrupter 3, or the grounding crossbeam 6, increasing the contact pressure between the contact surfaces, thereby improving conductivity and contact stability, reducing contact resistance, and ensuring the stability of current during transmission.

[0025] The connection angle between the docking part 732 and the connecting part 731 is less than 10°. When the connection angle is less than 10°, the applied force can be transmitted more directly to the docking part 732, avoiding the dispersion or loss of force caused by an excessively large angle, thereby improving the mechanical efficiency and response speed of the switch.

[0026] The drive plate 71 extends into the gap 733 between the connecting parts 731 and is fixedly connected to the connecting parts 731 by bolts. Limiting plates 72 are fixedly connected to both sides of the drive plate 71. The ends of the limiting plates 72 are provided with limiting protrusions 721 that abut against the connection between the connecting parts 731 and the mating parts 732. The contact surfaces of the limiting protrusions 721 and the connection between the connecting parts 731 and the mating parts 732 are arc-shaped. The design of the limiting plates 72 and their limiting protrusions 721 effectively restricts the relative movement between the connecting parts 731 and the mating parts 732, ensuring that the switch maintains a precise mating position during operation, thus improving the operating accuracy and consistency of the switch. The arc-shaped design effectively disperses the force, reducing local stress concentration at the connection point while bearing the force, which helps reduce the friction area and wear, and reduces wear caused by frequent operation.

[0027] The drive plate 71 and the limiting plate 72 are arranged in a triangle. A triangular design typically reduces material usage while maintaining strength, resulting in a lighter overall device. The mutual support between the base and the two sides of the triangle structure creates greater structural rigidity.

[0028] The housing 1 includes side plates 11 on both sides, a front plate 12 and a rear plate 13 fixed between the side plates 11. An arc-extinguishing chamber bracket 4 is fixedly mounted externally on the vacuum interrupter 3, and the vacuum interrupter 3 is fixed between the front plate 12 and the rear plate 13 via the arc-extinguishing chamber bracket 4. The independent arc-extinguishing chamber bracket 4 design makes the installation and disassembly of the vacuum interrupter 3 more convenient, and provides good inter-electrode insulation, allowing for independent operation of the switch's inter-electrode connections.

[0029] The arc-extinguishing chamber support 4 includes fixing blocks 41 on both the front and rear sides. The front plate 12 and rear plate 13 are provided with fixing holes 14. The front plate 12 and rear plate 13 are fixedly connected to the arc-extinguishing chamber support 4 via bolts to the fixing blocks 41 through the fixing holes 14. The bolt connection between the fixing blocks 41 and the front and rear plates 13 forms a stable mechanical connection, effectively withstanding dynamic and static loads during operation, improving the overall structure's compressive strength, and preventing loosening or detachment during long-term operation.

[0030] The arc-extinguishing chamber support 4 is made of insulating material. Insulating material effectively limits high-potential charged bodies, reduces the influence range of the high-voltage electric field, and ensures the safe operation of the equipment under high voltage, thereby protecting the safety of operators and the equipment itself. During maintenance, connecting one end of the straight blade plate 73 to ground and the other end to the vacuum arc-extinguishing chamber 3 achieves the purpose of insulated maintenance, ensuring personnel safety.

[0031] The top of the vacuum interrupter 3 is connected to a stationary contact 31 that extends out of the interrupter support 4. The stationary contact 31 is used to connect with the straight blade plate 73 to form a current connection circuit.

[0032] The upper isolating contact frame 5 is fixedly provided with an upper isolating stationary contact 51 corresponding to the position of the vacuum interrupter 3, and the grounding crossbeam 6 is fixedly provided with a grounding stationary contact 61 corresponding to the position of the vacuum interrupter 3.

[0033] This utility model relates to a double-break straight-blade disconnector, which is used to match the structure of vacuum circuit breakers or vacuum load switches. It can optimize the insulation electric field structure of gas-insulated ring network switchgear, improving the safety and reliability of power switch operation. This double-break straight-blade disconnector can be used in ring network switchgear with an upper isolation structure, but is not limited to such switchgear. It can be modified and extended to be applicable to ring network switchgear with a lower isolation structure.

[0034] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

[0035] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A double-break upper isolation device, characterized in that: The device includes a housing, within which are a drive spindle, several vacuum interrupters, an upper isolation contact frame, and a grounding beam. The drive spindle is equipped with a movable tool holder, which includes a drive plate that is fixedly fitted to the drive spindle. The drive plate is connected to spaced-apart straight blades, each blade including a connecting portion and mating portions at both ends of the connecting portion. The connecting portion and the mating portions form a gap for mating with the upper isolation contact frame, vacuum interrupters, or grounding beam. The connecting portion is a straight plate set at 180°.

2. The double-break upper isolation device as described in claim 1, characterized in that: The connection angle between the docking part and the connecting part is an acute angle.

3. The double-break upper isolation device as described in claim 2, characterized in that: The connection angle between the docking part and the connecting part is less than 10°.

4. The double-break upper isolation device as described in claim 1, characterized in that: The drive plate extends into the gap between the connecting parts and is fixedly connected to the connecting parts by bolts; limit plates are fixedly connected to both sides of the drive plate, and the end of the limit plate is provided with a limit protrusion that abuts against the connection between the connecting part and the mating part, and the abutting surface of the limit protrusion and the connection between the connecting part and the mating part is arc-shaped.

5. The double-break upper isolation device as described in claim 4, characterized in that: The drive plate and the limiting plate are arranged in a triangle.

6. The double-break upper isolation device as described in claim 1, characterized in that: The housing includes side plates on both sides, a front plate and a rear plate fixed between the side plates, and an arc-extinguishing chamber bracket fixedly installed outside the vacuum arc-extinguishing chamber. The vacuum arc-extinguishing chamber is fixedly installed between the front plate and the rear plate through the arc-extinguishing chamber bracket.

7. The double-break upper isolation device as described in claim 6, characterized in that: The arc-extinguishing chamber support includes fixing blocks on the front and rear sides. The front plate and the rear plate are provided with fixing holes. The front plate and the rear plate are fixedly connected to the arc-extinguishing chamber support by bolts to the fixing blocks through the fixing holes.

8. The double-break upper isolation device as described in claim 6 or 7, characterized in that: The arc-extinguishing chamber support is made of insulating material.

9. The double-break upper isolation device as described in claim 1, characterized in that: The top of the vacuum interrupter is connected to a stationary contact that extends out of the interrupter support. The stationary contact is used to connect with the straight blade plate to form a current connection circuit.

10. The double-break upper isolation device as described in claim 1, characterized in that: The upper isolating stationary contact corresponding to the position of the vacuum interrupter is fixed on the upper isolating contact frame, and the grounding stationary contact corresponding to the position of the vacuum interrupter is fixed on the grounding crossbeam.

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