A female rotating arc device for a three-column horizontal double-break turnover disconnector
Patent Information
- Application Number
- CN202522550236.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-01
AI Technical Summary
[0004]本实用新型的目的在于提供一种用于三柱水平双断口翻转式隔离开关的母转引弧装置，用于解决三柱水平双断口翻转式隔离开关进行母线转换电流的开合操作时存在的引弧能力不足、静触头被烧蚀的问题
[0015]本实用新型的有益效果是：本实用新型在第二引弧棒和拐臂之间设有两根弹簧，通过弹簧使得第一引弧棒和第二引弧棒配合作用施加夹紧力。初始状态时，弹簧预压一段距离以平衡第二引弧棒的重力，弹簧的设置保证导电管与第二引弧棒的有效接触之外，还能避免夹紧力过大导致的导电管进入静触头时提前翻转从而烧蚀导电管和静触头；引弧棒限位螺栓的设置，可以避免弹簧压缩作用下，第一引弧棒和第二引弧棒对导电管造成过压。转轴与拐臂的连接方式便于调节第一引弧棒和第二引弧棒的角度，保证导电管能够顺利接触第一引弧棒和第二引弧棒。本实用新型有效解决了常规隔离开关在开合母线转换电流时存在的电弧烧蚀核心部件、熄弧不可靠、与翻转式结构不匹配及引弧能力不足四大技术问题，通过采用自适应夹紧与专用引弧结构，配合优化的材料与模块化设计，实现了高可靠性引弧与熄弧、显著延长设备寿命、增强对复杂结构的适应性，并提高了现场维护便捷性。
Smart Images
Figure CN224907879U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of disconnecting switch technology, specifically a bus arc-starting device for a three-post horizontal double-break flip-type disconnecting switch. Background Technology
[0002] In modern substations, double-busbar or multi-busbar systems require busbar switching operations when changing loads. Traditionally, this operation relies on dedicated busbar transfer switches, which are costly and require a large footprint. Therefore, the industry urgently needs to equip conventional disconnect switches with this function. However, conventional three-post horizontal double-break flip-top disconnect switches generate a strong electric arc when the moving and stationary contacts separate during the breaking process. Existing technologies guide the arc by adding simple arc-initiating angles or arc-extinguishing grids, but these methods have the following drawbacks: insufficient arc-initiating capability, making it difficult to effectively transfer large-current arcs; the arc burns near critical components of the stationary contact, leading to severe erosion and reduced equipment lifespan; there is a lack of effective control over the arc path, resulting in unreliable arc extinguishing; and ordinary arc-initiating devices are difficult to match with the complex structure and special electric field of flip-top disconnect switches, making it impossible to achieve stable performance.
[0003] Therefore, there is an urgent need to develop a special arc-starting device for the stationary contact of a three-post horizontal double-break flip-type disconnector, so as to achieve safe and reliable busbar switching current switching capability. Utility Model Content
[0004] The purpose of this utility model is to provide a bus transfer arc-starting device for a three-post horizontal double-break flip-type disconnector, which solves the problems of insufficient arc-starting capability and erosion of stationary contacts when the three-post horizontal double-break flip-type disconnector performs bus transfer current switching operation.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a mother-rotor arc-initiating device for a three-post horizontal double-break flip-type disconnector, comprising a bracket, a rotating shaft, a crank arm, a first arc-initiating rod, a second arc-initiating rod, and a flexible connector. The bracket is fixedly connected to the stationary contact of the disconnector. The rotating shaft is rotatably mounted on the bracket. The crank arm is fixedly connected to the rotating shaft. The first arc-initiating rod is fixed on the crank arm. The second arc-initiating rod is movably connected to the crank arm, and a spring is provided between the two. When the first and second arc-initiating rods contact the conductive tube, arc initiation is achieved. The spring arrangement allows the first and second arc-initiating rods to cooperate in clamping the conductive tube. The first end of the flexible connector is fixedly connected to the stationary contact, and the second end of the flexible connector is fixedly connected to the second arc-initiating rod.
[0006] Furthermore, the bracket includes a first side plate and a second side plate, with a first end of the first side plate and a first end of the second side plate fixedly connected by a support plate, and both the first end of the first side plate and the first end of the second side plate are fixedly connected to a stationary contact.
[0007] Furthermore, the first end of the rotating shaft is rotatably connected to the second end of the first side plate, the second end of the rotating shaft is rotatably connected to the second end of the second side plate, and the first end of the crank arm is fixedly connected to the first end of the rotating shaft.
[0008] Furthermore, the first end of the crank arm has a clamping plate, and the first end of the rotating shaft extends into the clamping plate and bolts are installed on the clamping plate to achieve a fixed connection between the clamping plate and the rotating shaft.
[0009] Furthermore, the crank arm has a T-shaped structure, the first arc-inducing rod is fixedly connected to the second end of the crank arm, the third end of the crank arm has an elongated hole, the second arc-inducing rod passes through the elongated hole, and the spring is located between the first end of the second arc-inducing rod and the first end of the crank arm.
[0010] Furthermore, both the first end of the second arc-initiating rod and the first end of the crank arm are fixed with guide rods, and the guide rods on the second arc-initiating rod and the guide rods on the crank arm correspond one-to-one. The first end of the spring is fixedly connected to or sleeved on the guide rod on the second arc-initiating rod, and the second end of the spring is fixedly connected to or sleeved on the guide rod on the crank arm.
[0011] Furthermore, the first end of the crank arm is fixed with an arc-starting rod limiting bolt. When the first end of the second arc-starting rod contacts the arc-starting rod limiting bolt, the arc-starting rod limiting bolt limits the second arc-starting rod.
[0012] Furthermore, a bolt mounting plate is provided between the second and third ends of the crank arm, and a clamping force adjusting bolt is threadedly connected to the bolt mounting plate. When the clamping force adjusting bolt contacts the second end of the second arc-starting rod, the clamping force adjusting bolt limits the second arc-starting rod, and the clamping force of the second arc-starting rod can be adjusted by turning the clamping force adjusting bolt.
[0013] Furthermore, the second end of the rotating shaft has a long pin, and an ear plate is fixed on the second side plate. A long pin limiting bolt is fixed on the ear plate, and the long pin is limited when it contacts the long pin limiting bolt.
[0014] Furthermore, both the first and second arc-starting rods are made of tungsten gold.
[0015] The beneficial effects of this utility model are as follows: Two springs are provided between the second arc-initiating rod and the crank arm. These springs allow the first and second arc-initiating rods to work together to apply a clamping force. Initially, the springs are pre-compressed a certain distance to balance the weight of the second arc-initiating rod. The springs ensure effective contact between the conductive tube and the second arc-initiating rod, and also prevent excessive clamping force from causing the conductive tube to flip prematurely when entering the stationary contact, thus burning the conductive tube and the stationary contact. The arc-initiating rod limiting bolt prevents overpressure on the conductive tube caused by the first and second arc-initiating rods under spring compression. The connection between the rotating shaft and the crank arm facilitates adjustment of the angles of the first and second arc-initiating rods, ensuring smooth contact between the conductive tube and the first and second arc-initiating rods. This invention effectively solves four major technical problems of conventional disconnect switches when switching current on and off the busbar: arc erosion of core components, unreliable arc extinguishing, incompatibility with flip-type structure, and insufficient arc ignition capability. By adopting adaptive clamping and a dedicated arc ignition structure, combined with optimized materials and modular design, it achieves highly reliable arc ignition and extinguishing, significantly extends equipment life, enhances adaptability to complex structures, and improves the convenience of on-site maintenance. Attached Figure Description
[0016] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is a three-dimensional view of the bracket of this utility model; Figure 3 for Figure 1 Enlarged view of section A in the image; In the diagram: 1 stationary contact, 2 bracket, 21 first side plate, 22 support plate, 23 second side plate, 24 ear plate, 25 long pin limiting bolt, 3 rotating shaft, 31 long pin, 4 crank arm, 41 clamping plate, 42 spring, 43 guide rod, 44 arc-starting rod limiting bolt, 45 clamping force adjusting bolt, 46 long hole, 47 bolt mounting plate, 5 first arc-starting rod, 6 second arc-starting rod, 7 flexible connector, 8 conductive tube, 81 contact plate. Detailed Implementation
[0017] like Figures 1 to 3As shown, this utility model discloses a mother-mounted arc-initiating device for a three-column horizontal double-break flip-type disconnector, comprising a bracket 2, a rotating shaft 3, a crank arm 4, a first arc-initiating rod 5, a second arc-initiating rod 6, and a flexible connector 7. The bracket 2 is fixedly connected to the stationary contact 1 of the disconnector. The rotating shaft 3 is rotatably mounted on the bracket 2. The crank arm 4 is fixedly connected to the rotating shaft 3. The first arc-initiating rod 5 is fixed to the crank arm 4. The second arc-initiating rod 6 is movably connected to the crank arm 4, and a spring 42 is provided between the two. When the first arc-initiating rod 5 and the second arc-initiating rod 6 contact the conductive tube 8, arcing is achieved. The first arc-initiating rod 5 and the second arc-initiating rod 6 are arranged vertically. The spring 42 allows the first arc-initiating rod 5 and the second arc-initiating rod 6 to work together to clamp the conductive tube 8. The first end of the flexible connector 7 is fixedly connected to the stationary contact 1, and the second end of the flexible connector 7 is fixedly connected to the second arc-initiating rod 6. Since the first arc-initiating rod 5 is fixedly connected to the crank arm 4, and the second arc-initiating rod 6 is movably connected to the crank arm, and a spring 42 is provided between the second arc-initiating rod 6 and the crank arm 4, when the spring 42 is at its natural length, the distance between the first arc-initiating rod 5 and the second arc-initiating rod 6 is less than the size of the contact plate 81 on the conductive tube 8. As a result, the first arc-initiating rod 5 and the second arc-initiating rod 6 work together to clamp the contact plate 81. Under the action of a suitable clamping force, the conductive tube will not flip prematurely when it enters the stationary contact, so as not to burn the conductive tube and the stationary contact due to premature flipping.
[0018] As one implementation of the support 2, such as Figure 2 As shown, the bracket 2 includes a first side plate 21 and a second side plate 22. The first end of the first side plate 21 and the first end of the second side plate 22 are fixedly connected by a support plate 23, and the first end of the first side plate 21 and the first end of the second side plate 22 are both fixedly connected to the stationary contact 1 by bolts. The first side plate 21 is a sheet metal bending part, including two parallel sections and an inclined transition section between the two sections.
[0019] As one way to assemble the pivot 3 and the bracket 2, such as Figure 1 , Figure 2 As shown, the first end of the rotating shaft 3 is rotatably connected to the second end of the first side plate 21, the second end of the rotating shaft 3 is rotatably connected to the second end of the second side plate 22, and the first end of the crank arm 4 is fixedly connected to the first end of the rotating shaft 3.
[0020] As one way to assemble the crank arm 4 and the pivot 3, such as Figure 1 As shown, the first end of the crank arm 4 has a clamping plate 41, the first end of the rotating shaft 3 extends into the clamping plate 41, and bolts are installed on the clamping plate 41 to achieve a fixed connection between the clamping plate 41 and the rotating shaft 3.
[0021] As one implementation of the crank arm 4, such as Figure 1As shown, the crank arm 4 has a T-shaped structure. The first arc-inducing rod 5 is fixedly connected to the second end of the crank arm 4 by a threaded connection. The third end of the crank arm 4 has an elongated hole 46, through which the second arc-inducing rod 6 passes. The spring 42 is located between the first end of the second arc-inducing rod 6 and the first end of the crank arm 4. The elongated hole 46 allows the second arc-inducing rod 6 to move up and down within it. The second ends of the first arc-inducing rod 5 and the second arc-inducing rod 6 are raised, serving as guide sections to guide the contact plate 81 between the first arc-inducing rod 5 and the second arc-inducing rod 6. The middle part of the first arc-inducing rod 5 and the second arc-inducing rod 6 is the drainage section.
[0022] As one assembly method between the second arc-initiating rod 6 and the crank arm 4, both the first end of the second arc-initiating rod 6 and the first end of the crank arm 4 are fixed with guide rods 43, and the guide rods 43 on the second arc-initiating rod 6 and the guide rods 43 on the crank arm 4 correspond one-to-one. The first end of the spring 42 is fixedly connected to the guide rod 43 on the second arc-initiating rod 6, or the first end of the spring 42 is sleeved on the guide rod 43 on the second arc-initiating rod 6. The second end of the spring 42 is fixedly connected to the guide rod 43 on the crank arm 4, or the second end of the spring 42 is sleeved on the guide rod 43 on the crank arm 4. The guide rods 43 serve to assemble the spring 42 and guide its extension and retraction.
[0023] As one embodiment of limiting the second arc-starting rod 6, the first end of the crank arm 4 is fixed with an arc-starting rod limiting bolt 44. When the first end of the second arc-starting rod 6 contacts the arc-starting rod limiting bolt 44, the arc-starting rod limiting bolt 44 limits the second arc-starting rod 6.
[0024] As one implementation method for adjusting the clamping force of the second arc-initiating rod 6, such as Figure 3 As shown, there is a bolt mounting plate 47 between the second end and the third end of the crank arm 4. A clamping force adjusting bolt 45 is threaded onto the bolt mounting plate 47. When the clamping force adjusting bolt 45 contacts the second end of the second arc-starting rod 6, the clamping force adjusting bolt 45 limits the second arc-starting rod 6, and the clamping force of the second arc-starting rod 6 can be adjusted by turning the clamping force adjusting bolt 45.
[0025] In addition, such as Figure 2 As shown, a long pin 31 is provided at the second end of the rotating shaft 3, and an ear plate 24 is fixed on the second side plate 22. A long pin limiting bolt 25 is fixed on the ear plate 24. When the long pin 31 contacts the long pin limiting bolt 25, it is limited. The long pin 31, ear plate 24, and long pin limiting bolt 25 serve as counterweights to balance the weight of the second arc-starting rod 6 and the crank arm 4. The first arc-starting rod 5, the second arc-starting rod 6, and the contact plate 81 are all made of tungsten gold to increase conductivity and heat resistance.
[0026] The working principle of this utility model is described below: When closing the circuit, the contact plate 81 on the conductive tube 8 contacts the second arc-initiating rod 6 or the first arc-initiating rod 5. When the conductive tube 8 is higher than the stationary contact 1, the contact plate 81 contacts the first arc-initiating rod 5 first. When the conductive tube 8 is lower than the stationary contact 1, the contact plate 81 contacts the second arc-initiating rod 6 first. The conductive tube 8 is guided smoothly into the stationary contact 1 by the guide portion of the first arc-initiating rod 5 or the second arc-initiating rod 6. When the conductive tube 8 moves from the guide portion of the first arc-initiating rod 5 or the second arc-initiating rod 6 to the current-draining portion, the first arc-initiating rod 5 and the second arc-initiating rod 6 simultaneously contact the contact plate 81. Subsequently, the conductive tube 8 rotates and completes the closing process within the stationary contact 1. During this process, the first arc-initiating rod 5 or the second arc-initiating rod 6 always contacts the contact plate 81, transferring the generated large current arc to the transmission line through the flexible connector 7 and the stationary contact 1, ensuring the safe transfer of the large current arc through the flexible connector 7, and effectively preventing the direct burning of the conductive tube 8 and the stationary contact 1 by the arc. The opening process is the reverse and will not be described in detail.
[0027] This invention incorporates two springs between the second arc-initiating rod and the crank arm. These springs work together to apply a clamping force to the first and second arc-initiating rods. Initially, the springs are pre-compressed to balance the weight of the second arc-initiating rod. The clamping force adjusting bolt adjusts the clamping force of the second arc-initiating rod, ensuring effective contact between the conductive tube and the second arc-initiating rod, while also preventing excessive clamping force from causing the conductive tube to prematurely flip upon entering the stationary contact, thus burning the conductive tube and the stationary contact. Simultaneously, the arc-initiating rod limiting bolt prevents overpressure on the conductive tube from the first and second arc-initiating rods under spring compression. The connection between the rotating shaft and the crank arm facilitates adjustment of the angles of the first and second arc-initiating rods, ensuring smooth contact between the conductive tube and the first and second arc-initiating rods. The long pin and long pin limiting bolt limit the swing angle of the crank arm and balance the weight of the crank arm, the first arc-initiating rod, and the second arc-initiating rod. Springs, clamping force adjusting bolts, and clamping plates all adjust the clamping force of the first and second arc-initiating rods. This multi-directional adjustment mechanism ensures that the conductive tube smoothly enters the stationary contact, and that stable and reliable contact is formed between the conductive tube and both the first and second arc-initiating rods, guaranteeing that the large-current arc generated during opening and closing can be broken and transferred. This effectively solves four major technical problems of conventional disconnecting switches during busbar current switching: arc erosion of core components, unreliable arc extinguishing, incompatibility with the flip-type structure, and insufficient arc-initiating capability. By adopting adaptive clamping and a dedicated arc-initiating structure, combined with optimized materials and modular design, it achieves highly reliable arc initiation and extinguishing, significantly extends equipment life, enhances adaptability to complex structures, and improves the convenience of on-site maintenance.
Claims
1. A bus arc-starting device for a three-post horizontal double-break flip-top disconnector, characterized in that, The device includes a bracket, a rotating shaft, a crank arm, a first arc-inducing rod, a second arc-inducing rod, and a flexible connector. The bracket is fixedly connected to the stationary contact of the disconnecting switch. The rotating shaft is rotatably mounted on the bracket. The crank arm is fixedly connected to the rotating shaft. The first arc-inducing rod is fixed to the crank arm. The second arc-inducing rod is movably connected to the crank arm, and a spring is provided between the two. When the first and second arc-inducing rods contact the conductive tube, they induce an arc. The spring allows the first and second arc-inducing rods to work together to clamp the conductive tube. The first end of the flexible connector is fixedly connected to the stationary contact, and the second end of the flexible connector is fixedly connected to the second arc-inducing rod.
2. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 1, characterized in that, The bracket includes a first side plate and a second side plate. The first end of the first side plate and the first end of the second side plate are fixedly connected by a support plate, and the first end of the first side plate and the first end of the second side plate are both fixedly connected to a stationary contact.
3. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 2, characterized in that, The first end of the rotating shaft is rotatably connected to the second end of the first side plate, the second end of the rotating shaft is rotatably connected to the second end of the second side plate, and the first end of the crank arm is fixedly connected to the first end of the rotating shaft.
4. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 3, characterized in that, The first end of the crank arm has a clamping plate, and the first end of the rotating shaft extends into the clamping plate and bolts are installed on the clamping plate to achieve a fixed connection between the clamping plate and the rotating shaft.
5. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 4, characterized in that, The crank arm has a T-shaped structure. The first arc-inducing rod is fixedly connected to the second end of the crank arm. The third end of the crank arm has an elongated hole. The second arc-inducing rod passes through the elongated hole. The spring is located between the first end of the second arc-inducing rod and the first end of the crank arm.
6. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 5, characterized in that, Both the first end of the second arc-initiating rod and the first end of the crank arm are fixed with guide rods, and the guide rods on the second arc-initiating rod and the guide rods on the crank arm correspond one-to-one. The first end of the spring is fixedly connected to or sleeved on the guide rod on the second arc-initiating rod, and the second end of the spring is fixedly connected to or sleeved on the guide rod on the crank arm.
7. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 6, characterized in that, The first end of the crank arm is fixed with an arc-starting rod limiting bolt. When the first end of the second arc-starting rod contacts the arc-starting rod limiting bolt, the arc-starting rod limiting bolt limits the second arc-starting rod.
8. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 7, characterized in that, A bolt mounting plate is provided between the second and third ends of the crank arm. A clamping force adjusting bolt is threaded onto the bolt mounting plate. When the clamping force adjusting bolt contacts the second end of the second arc-starting rod, the clamping force adjusting bolt limits the second arc-starting rod, and the clamping force of the second arc-starting rod can be adjusted by turning the clamping force adjusting bolt.
9. A bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 8, characterized in that, The second end of the rotating shaft has a long pin, and an ear plate is fixed on the second side plate. A long pin limiting bolt is fixed on the ear plate. When the long pin contacts the long pin limiting bolt, the long pin is limited.
10. The bus arc-starting device for a three-post horizontal double-break flip-top disconnector according to claim 1, characterized in that, Both the first and second arc-starting rods are made of tungsten gold.