A lower isolating circuit breaker switch
By integrating a vacuum interrupter, cam drive assembly, and grounding assembly into the lower isolating circuit breaker switch, the problems of traditional circuit breaker switches being non-compact, complex to operate, and having poor electrical performance are solved, resulting in a compact and reliable power control device that improves electrical performance and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 浙江联格电气科技有限公司
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional disconnect circuit breakers have a non-compact switch structure, occupy a large space, are complex to operate, frequently experience transmission failures, and have poor electrical performance, which affects the power supply reliability and equipment lifespan of the power system.
Three sets of vacuum interrupters are connected together on the main shaft. Combined with the cam drive assembly, moving contact assembly and grounding assembly, the design features a compact structural layout. A flexible current conduction path is provided through a flexible connection plate. The isolation crank arm and the nested connection of the raised groove disperse stress. The vacuum mounting base ensures accurate installation of the stationary contact. The grounding assembly quickly conducts fault current.
It achieves a compact switch structure, simple and reliable operation, reduced space occupation, improved electrical performance and operating efficiency, ensured personal and equipment safety, and extended service life.
Smart Images
Figure CN224536951U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit breaker switch technology, and in particular to a lower isolating circuit breaker switch. Background Technology
[0002] In power systems, circuit breakers, as critical power control devices, bear the important responsibility of connecting, carrying, and disconnecting current under normal circuit conditions, as well as carrying and disconnecting current under abnormal circuit conditions within a specified time. Traditional bottom-disconnecting circuit breakers suffer from dispersed layouts of components such as vacuum interrupters, moving contact assemblies, and grounding assemblies, resulting in a less compact overall structure and larger footprint. This can lead to installation difficulties and wasted space in space-constrained distribution cabinets or substations. Furthermore, in terms of operation, the complex transmission structures of some traditional switches make operation inconvenient and prone to transmission failures, affecting normal opening and closing operations and reducing the reliability of the power supply system. Finally, in terms of electrical performance, the current conduction path design of traditional switches is inadequate, resulting in high contact resistance and severe overheating. This not only reduces the electrical performance of the switch but also accelerates component aging and shortens the switch's lifespan. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide a lower isolating circuit breaker switch that is compact in structure, reasonable in layout, easy and reliable in operation, and has excellent electrical performance.
[0004] To achieve the above objectives, this utility model employs a bottom-disconnecting circuit breaker switch, comprising a frame and a vacuum interrupter assembly mounted on the frame. The vacuum interrupter assembly includes three sets of vacuum interrupters. The frame is equipped with moving contact assemblies and grounding assemblies corresponding to the number of vacuum interrupters. One end of each of the three sets of vacuum interrupters is connected to a main shaft rotatably mounted on the frame. A cam drive assembly corresponding to the number of vacuum interrupters is mounted on the main shaft. The cam drive assembly is used to drive the corresponding vacuum interrupter in conjunction with the main shaft. A stationary contact assembly is provided between the moving contact assembly and the vacuum interrupter. Each stationary contact assembly is connected to the end of each vacuum interrupter furthest from the cam drive assembly. The frame is equipped with a pad and a grounding support plate. The moving contact assembly is mounted on the pad, and the grounding assembly is mounted on the grounding support plate.
[0005] The beneficial effects of the above structure are as follows: by connecting the three sets of vacuum interrupters together on the main shaft, and cooperating with the corresponding cam drive assembly, moving contact assembly and grounding assembly, the entire switch structure is compact and rationally laid out, effectively reducing space occupation. The main shaft is rotated and mounted on the frame, and the cam drive assembly is linked with the main shaft to drive the vacuum interrupters, making the operation of the switch simpler and more reliable. The structure design of the pad provides stable support and installation foundation for the moving contact assembly, and can effectively limit contact overshoot and protect the contact ends. The design of the grounding assembly can quickly conduct current to the ground in the event of switch failure or misoperation, effectively preventing electric shock to operators and ensuring personal safety and equipment safety.
[0006] This utility model further includes an arc-extinguishing chamber connecting plate between the cam drive assembly and the vacuum interrupter. A flexible connecting plate is mounted on the arc-extinguishing chamber connecting plate, with one end of the flexible connecting plate installed on the arc-extinguishing chamber connecting plate and the other end extending outwards into a slot on the mechanism frame. An arc-extinguishing chamber guide insulating plate, fitted onto the vacuum interrupter, is also provided between the arc-extinguishing chamber connecting plate and the vacuum interrupter. The arc-extinguishing chamber guide insulating plate has protrusions, and the mechanism frame has corresponding fixing slots that connect to these protrusions. By having one end of the flexible connecting plate installed on the arc-extinguishing chamber connecting plate and the other end extending outwards into the mechanism frame, a flexible and reliable current conduction path can be provided. The flexible connecting plate can adapt to certain movements and deformations, reducing the impact of mechanical vibration or thermal expansion and contraction on current conduction, ensuring stable current transmission during switch operation, reducing contact resistance and heating, and improving the electrical performance and operating efficiency of the switch.
[0007] This utility model is further configured such that the moving contact assembly includes an isolation crank arm, an isolation blade assembly, and a moving contact. The isolation crank arm has a U-shaped shell structure and an internal accommodating space for installing the isolation blade assembly. One end of the moving contact is mounted on a pad, and the other end extends into the accommodating space of the isolation crank arm and is connected to the support connector of the isolation blade assembly. The end of the isolation blade assembly extends outward from the isolation crank arm through a rectangular opening on the isolation crank arm and is positioned towards the corresponding stationary contact assembly. Adjacent isolation crank arms are connected in series to form an array through a nested structure of protrusions and grooves. The isolation crank arm, isolation blade assembly, and moving contact work together to form a compact structural layout. The isolation crank arm adopts a U-shaped shell structure with a dedicated internal space, providing a stable mounting location for the isolation blade assembly. One end of the moving contact is firmly installed in the pad, while the other end extends downward into the receiving space of the isolation crank arm and is tightly connected to the support connector of the isolation blade assembly. This allows the moving contact assembly to respond flexibly and connect stably during operation. Adjacent isolation crank arms are connected by a nested structure of protrusions and grooves, forming a series array. When subjected to external forces, this connection design can effectively disperse stress. Through the interlocking of the protrusions and grooves, the stress is evenly distributed, avoiding structural damage caused by local stress concentration.
[0008] This utility model is further configured such that a vacuum fixing seat is installed at the end of the vacuum interrupter away from the cam drive assembly. A stationary contact assembly is installed on the vacuum fixing seat. The stationary contact assembly includes a stationary contact, a stationary contact support plate, and a stationary contact baffle. A contact groove is provided on the vacuum fixing seat. One end of the stationary contact is installed inside the vacuum fixing seat, and the other end extends outward through the contact groove to the outside of the vacuum fixing seat. A stationary contact support plate is provided between the stationary contact and the stationary contact baffle. The stationary contact support plate has a U-shaped opening. The stationary contact is installed on the stationary contact support plate, and the stationary contact portion passes through the U-shaped opening in the stationary contact support plate and abuts against the stationary contact baffle. The vacuum mounting base provides a reliable mounting foundation for the stationary contact assembly. By opening contact slots, the stationary contact can be precisely installed, ensuring accurate alignment with the moving contact and improving the contact reliability of the switch. The stationary contact support plate not only supports the stationary contact, but its U-shaped design also makes the connection between the stationary contact and the stationary contact baffle more compact and reasonable. At the same time, this design can effectively and evenly distribute the electric field around the stationary contact, reduce the local electric field intensity, reduce the possibility of corona discharge and arcing, and improve the electrical performance of the product.
[0009] This utility model further comprises a grounding assembly including a grounding busbar mounted on a grounding support plate. A grounding blade, which mates with a corresponding moving contact assembly, is installed on the grounding busbar. The grounding blade has a grounding reinforcing bar with a connector adapted to the grounding blade. The grounding reinforcing bar is fitted into the inner bottom wall of the grounding blade through the connector. This connector securely fits the grounding blade near its bottom, enhancing the overall structural strength of the grounding blade and ensuring it is not easily deformed or damaged when subjected to fault current. The grounding support, grounding busbar, and grounding blade together constitute a complete grounding system. When a switchgear malfunctions, this system functions rapidly. The grounding blade conducts the fault current to the earth through the grounding busbar and grounding support, effectively preventing electric shock to operators. Furthermore, the optimized placement of the grounding reinforcing bar further improves the current conduction path, enhancing the reliability and stability of the grounding system.
[0010] This utility model is further configured with a frame comprising a front wall panel and a rear wall panel, as well as a first support plate and a second support plate, a first bracket plate and a second bracket plate installed between the front wall panel and the rear wall panel. The first bracket plate and the second bracket plate are both located at one end of the cam transmission assembly, and a transmission bracket is provided between them. The first support plate and the second support plate are located at one end of the moving contact assembly and are arranged in a bottom-up distribution. The frame is composed of the front wall panel, the rear wall panel, and the first, second, first, and second support plates. The front and rear wall panels serve as the main frame, providing basic support for the entire mechanism, while the first, second, first, and second support plates further enhance the rigidity and stability of the frame. The transmission bracket strengthens the area where the cam transmission assembly is located. Attached Figure Description
[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.
[0012] Figure 2 This is a schematic diagram of the internal structure of the mechanism frame according to an embodiment of the present utility model.
[0013] Figure 3 This is a schematic diagram of the frame structure of an embodiment of the present utility model. Detailed Implementation
[0014] like Figures 1-3As shown, an embodiment of this utility model provides a lower isolating circuit breaker switch, including a frame 1 and a vacuum interrupter group 2 disposed on the frame 1. The vacuum interrupter group 2 includes three vacuum interrupters 21. The frame 1 is provided with moving contact assemblies 3 and grounding assemblies 4 corresponding to the number of vacuum interrupters 21. One end of the three vacuum interrupters 21 is connected to a main shaft 5 rotatably mounted on the frame 1. Cam transmission assemblies 6 corresponding to the number of vacuum interrupters 21 are respectively installed on the main shaft 5. The cam transmission assemblies 6 are used to drive the corresponding vacuum interrupters 21 in linkage with the main shaft 5. A stationary contact assembly 7 is provided between the moving contact assembly 3 and the vacuum interrupter 21. The stationary contact assembly 7 is connected to the end of each vacuum interrupter 21 away from the cam transmission assembly 6. The frame 1 is provided with a pad 30 and a grounding support plate 40. The moving contact assembly 3 is installed on the pad 30, and the grounding assembly 4 is installed on the grounding support plate 40.
[0015] An arc-extinguishing chamber connecting plate 8 is provided between the cam transmission assembly 6 and the vacuum interrupter 21. A flexible connecting plate 81 is installed on the arc-extinguishing chamber connecting plate 8. One end of the flexible connecting plate 81 is installed on the arc-extinguishing chamber connecting plate 8, and the other end extends to the outside of the mechanism frame 1 through the slot 20. The flexible connecting plate 81 can be expanded and changed to the left or right direction or type according to the customer's plan, such as single outlet with left or right side, or double outlet direction, vertical outlet with left or right side. An arc-extinguishing chamber guide insulating plate 22 is also provided between the arc-extinguishing chamber connecting plate 8 and the vacuum interrupter 21 and is sleeved on the vacuum interrupter 21. The arc-extinguishing chamber guide insulating plate 22 is provided with a protrusion 23. The mechanism frame 1 is provided with a corresponding fixing slot 10 that connects to the protrusion 23.
[0016] The moving contact assembly 3 includes an isolation crank arm 31, an isolation blade assembly 32, and a moving contact 33. The isolation crank arm 31 has a U-shaped housing structure and an internal space for installing the isolation blade assembly 32. One end of the moving contact 33 is mounted on the pad 30, and the other end extends into the space of the isolation crank arm 31 and is connected to the support connector of the isolation blade assembly 32 (the support connector is a key component connecting the moving contact 33 and the isolation blade assembly 31, used for force transmission and position fixing; its detailed structure is described in detail in the load switch patent filed at the same time). The end of the isolation blade assembly 32 extends outward from the isolation crank arm 31 through a rectangular opening on the isolation crank arm 31 and is positioned toward the corresponding stationary contact assembly 7. Adjacent isolation crank arms 31 are connected in series to form an array through a nested structure of protrusions and grooves.
[0017] A vacuum fixing seat 24 is installed at the end of the vacuum interrupter 21 away from the cam drive assembly 6. A stationary contact assembly 7 is installed on the vacuum fixing seat 24. The stationary contact assembly 7 includes a stationary contact 71, a stationary contact support plate 72, and a stationary contact baffle 73. A contact groove is provided on the vacuum fixing seat 24. One end of the stationary contact 71 is installed inside the vacuum fixing seat 24, and the other end extends outward through the contact groove to the outside of the vacuum fixing seat 24. A stationary contact support plate 72 is provided between the stationary contact 71 and the stationary contact baffle 73. The stationary contact support plate 72 has a U-shaped opening. The stationary contact 71 is installed on the stationary contact support plate 72, and part of the stationary contact 71 passes through the U-shaped opening of the stationary contact support plate 72 and abuts against the stationary contact baffle 73.
[0018] The grounding assembly 4 includes a grounding busbar 41 mounted on a grounding support plate 40. A grounding blade 42 that mates with a corresponding moving contact 3 assembly is mounted on the grounding busbar 41. A grounding reinforcing rib 43 is provided on the grounding blade 42. A plug-in interface adapted to the grounding blade 42 is provided on the grounding reinforcing rib 43. The grounding reinforcing rib 43 is sleeved on the inner bottom wall of the grounding blade 42 through the plug-in interface.
[0019] The frame 1 includes a front wall panel 11 and a rear wall panel 12, as well as a first support plate 13 and a second support plate 14, a first bracket plate 15 and a second bracket plate 16 installed between the front wall panel 11 and the rear wall panel 12. The first bracket plate 15 and the second bracket plate 16 are both located at one end of the cam transmission assembly 6, and a transmission bracket 9 is provided between them. The first support plate 13 and the second support plate 14 are located at one end of the moving contact assembly 3 and are arranged in a bottom-up distribution.
[0020] An isolation shaft assembly 17 is installed on the front wall panel 11, and a positioning shaft assembly 18 is installed on the rear wall panel 12. The isolation shaft assembly 17 is connected to one end of the first isolation crank arm 31 in the series array, and the positioning shaft assembly 18 is connected to one end of the last isolation crank arm 31 in the series array.
[0021] It should be noted that only one set of components is marked in detail in the diagram, but the entire structure contains three identical sets of components.
[0022] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model, and the utility model creation is in line with the applicant's actual R&D capabilities and resource conditions.
Claims
1. A bottom isolating circuit breaker switch, characterized in that: The system includes a frame and a vacuum interrupter assembly mounted on the frame. The vacuum interrupter assembly comprises three sets of vacuum interrupters. The frame is equipped with moving contact assemblies and grounding assemblies corresponding to the number of vacuum interrupters. One end of each of the three sets of vacuum interrupters is connected to a main shaft rotatably mounted on the frame. Each main shaft is equipped with a cam drive assembly corresponding to the number of vacuum interrupters. The cam drive assembly is used to drive the corresponding vacuum interrupter in conjunction with the main shaft. A stationary contact assembly is provided between the moving contact assembly and the vacuum interrupter. The stationary contact assembly is connected to the end of each vacuum interrupter away from the cam drive assembly. The frame is equipped with a pad and a grounding support plate. The moving contact assembly is mounted on the pad, and the grounding assembly is mounted on the grounding support plate.
2. The lower isolating circuit breaker switch according to claim 1, characterized in that: An arc-extinguishing chamber connecting plate is provided between the cam transmission assembly and the vacuum arc-extinguishing chamber. A flexible connecting plate is installed on the arc-extinguishing chamber connecting plate. One end of the flexible connecting plate is installed on the arc-extinguishing chamber connecting plate, and the other end extends out of the mechanism frame through a slot. An arc-extinguishing chamber guide insulating plate is also provided between the arc-extinguishing chamber connecting plate and the vacuum arc-extinguishing chamber, and an arc-extinguishing chamber guide insulating plate is provided on the vacuum arc-extinguishing chamber. A protrusion is provided on the arc-extinguishing chamber guide insulating plate, and a corresponding fixing slot is provided on the mechanism frame to connect with the protrusion.
3. The lower isolating circuit breaker switch according to claim 1, characterized in that: The moving contact assembly includes an isolation crank arm, an isolation blade assembly, and a moving contact. The isolation crank arm has a U-shaped shell structure and an internal space for installing the isolation blade assembly. One end of the moving contact is mounted on a pad, and the other end extends into the isolation crank arm's receiving space and is connected to the support connector of the isolation blade assembly. The end of the isolation blade assembly extends outward from the isolation crank arm through a rectangular opening and faces the corresponding stationary contact assembly. Adjacent isolation crank arms are connected in series to form an array through a nested structure of protrusions and grooves.
4. The lower isolating circuit breaker switch according to claim 1, characterized in that: The vacuum interrupter is equipped with a vacuum mounting base at the end away from the cam drive assembly. A stationary contact assembly is mounted on the vacuum mounting base. The stationary contact assembly includes a stationary contact, a stationary contact support plate, and a stationary contact baffle. A contact groove is provided on the vacuum mounting base. One end of the stationary contact is installed inside the vacuum mounting base, and the other end extends outward through the contact groove to the outside of the vacuum mounting base. A stationary contact support plate is provided between the stationary contact and the stationary contact baffle. The stationary contact support plate has a U-shaped opening. The stationary contact is mounted on the stationary contact support plate, and the stationary contact portion passes through the U-shaped opening in the stationary contact support plate and abuts against the stationary contact baffle.
5. The lower isolating circuit breaker switch according to claim 1, characterized in that: The grounding assembly includes a grounding busbar mounted on a grounding support plate. A grounding blade that mates with a corresponding moving contact assembly is installed on the grounding busbar. A grounding reinforcing plate is provided on the grounding blade. The grounding reinforcing plate has a plug-in interface adapted to the grounding blade. The grounding reinforcing plate is sleeved on the inner bottom wall of the grounding blade through the plug-in interface.
6. The lower isolating circuit breaker switch according to any one of claims 1-5, characterized in that: The frame includes a front wall panel and a rear wall panel, as well as a first support plate and a second support plate, a first bracket plate and a second bracket plate installed between the front wall panel and the rear wall panel. The first bracket plate and the second bracket plate are both located at one end of the cam transmission assembly and a transmission bracket is provided between them. The first support plate and the second support plate are located at one end of the moving contact assembly and are arranged in a bottom-up distribution.