Moving contact of molded case circuit breaker
By employing a downward tension spring and tension spring rod to fix the rotating shaft in the moving contact, the problems of uneven spring force and difficult assembly in existing moving contacts are solved, achieving balanced contact and stable use of the moving contact piece.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG KERUIPU ELECTRICAL
- Filing Date
- 2025-05-27
- Publication Date
- 2026-05-01
AI Technical Summary
The existing moving contact uses an inward spring to provide downward pressure, which requires a large spring to ensure sufficient downward pressure, and is inconvenient to assemble, especially for multi-plate moving contacts where the tension is uneven and assembly is complicated.
A downward tension spring provides downward pressure to the moving contact, a double row of tension springs ensures the balance of the moving contact piece, and the rotating shaft is fixed by a tension spring rod and a baffle, simplifying the assembly process.
This achieves balanced contact and stable use of the moving contact piece, simplifies the assembly process, and improves the reliability and stability of the assembly.
Smart Images
Figure CN224190921U_ABST
Abstract
Description
A moving contact of a molded case circuit breaker Technical Field
[0001] This utility model relates to the field of low-voltage electrical equipment, specifically a moving contact of a molded case circuit breaker. Background Technology
[0002] A molded case circuit breaker is a power distribution device used in power grids to distribute electrical energy, protect lines, and prevent electrical equipment from being damaged by overload or short circuit faults.
[0003] Existing moving contacts typically use inward springs to provide downward pressure. The direction of the spring force is different from the direction of the pressure, requiring a larger spring to ensure sufficient downward pressure. This is especially true for multi-plate moving contacts, where it is difficult to ensure that the tension of each moving contact is the same. Furthermore, the assembly of moving contacts is inconvenient, particularly the assembly of the shaft and the spring. Summary of the Invention
[0004] To address the aforementioned shortcomings, this utility model provides a moving contact for a molded case circuit breaker.
[0005] To achieve the above objectives, this utility model employs a moving contact of a molded case circuit breaker, comprising a moving contact frame, moving contact plates, and a connecting plate. A rotating shaft is installed within the moving contact frame, and multiple moving contact plates are arranged side-by-side within the frame. The rotating shaft passes through the rear end of the moving contact plates, and the front end of the moving contact plates extends out of the frame. A contact point is located below the top of each moving contact plate. The connecting plate is connected to the rotating shaft and tightly fitted to the moving contact plates. A tension spring is installed within the moving contact frame, and a tension spring rod is located at the bottom of the frame. The upper end of the tension spring hangs below the moving contact plates within the frame, and the lower end hangs on the spring rod. A rotating shaft groove is formed inside the frame, with both ends of the rotating shaft positioned within it. A baffle groove is laterally formed in the middle of the rotating shaft groove, with an opening on one side. A baffle is installed within the groove, inserted through the opening to enclose the rotating shaft within the groove.
[0006] Specifically, a tension spring rod groove is provided below the moving contact frame, and the tension spring rod is disposed in the tension spring rod groove.
[0007] Specifically, the tension spring rod is provided with tension spring grooves at equal intervals, and the lower end of the tension spring is hung in the tension spring groove.
[0008] Specifically, each of the moving contact pieces has two tension springs hanging below it, and two tension spring rods are also attached to it. The lower ends of the two tension springs are respectively attached to the two tension spring rods.
[0009] Specifically, the moving contact piece is provided with two tension spring holes, the upper end of the tension spring is hung in the tension spring hole, and a triangular relief groove is formed below the tension spring hole to allow the tension spring to swing angle to be adapted.
[0010] The beneficial effects of this utility model are that the moving contact uses a downward tension spring to provide downward pressure, and the double-row tension spring can ensure that the moving contact piece will not tilt and maintain the contact balance of the moving contact piece; the tension spring rod is set in the tension spring rod groove and is tightened on the moving contact piece by the tension spring, and the rotating shaft is fixed in the rotating shaft groove by the baffle, which makes assembly convenient and the use stable and reliable. Attached Figure Description
[0011] Figure 1 is a schematic diagram of a specific embodiment of the present invention.
[0012] Figure 2 is a top view of a specific embodiment of this utility model.
[0013] Figure 3 is a schematic diagram of the assembly of the moving contact frame and the rotating shaft according to a specific embodiment of the present invention.
[0014] Figure 4 is a cross-sectional view AA of Figure 2.
[0015] Figure 5 is a cross-sectional view of Figure 3. Detailed Implementation
[0016] As shown in Figures 1 to 5, a specific embodiment of this utility model is a moving contact of a molded case circuit breaker, including a moving contact frame 1, a moving contact piece 2, and a connecting plate 3. A rotating shaft 4 is installed inside the moving contact frame 1. Multiple moving contact pieces 2 are arranged side-by-side inside the moving contact frame 1. The rotating shaft 4 passes through the rear end of the moving contact pieces 2. The front end of the moving contact pieces 2 extends out of the moving contact frame 1. A contact point 5 is provided below the top of the moving contact piece 2. The connecting plate 3 is connected to the rotating shaft 4 and tightly fitted to the moving contact pieces 2. A tension spring 7 is installed inside the moving contact frame 1. Two tension spring rods 8 are provided at the bottom of the moving contact frame 1. A tension spring rod groove 11 is opened at the bottom of the moving contact frame 1, and the tension spring rods 8 are disposed in the tension spring rod groove 11. Two tension spring rods 8 are provided on the moving contact piece 2. The upper ends of the two tension springs 7 are hung in the two tension spring holes 23 below the moving contact piece 2. A triangular relief groove 24 is formed below the tension spring holes 23 to accommodate the swing angle of the tension springs 7. Tension spring grooves 81 are provided at equal intervals on the tension spring rods 8. The lower ends of the two tension springs 7 are respectively hung in the corresponding tension spring grooves 81 of the two tension spring rods 8. A rotating shaft groove 12 is formed inside the moving contact frame 1. The two ends of the rotating shaft 4 are set in the rotating shaft groove 12. A baffle groove 13 is opened laterally in the middle of the rotating shaft groove 12. An opening is formed on one side of the baffle groove 13. A baffle 9 is set in the baffle groove 13. The baffle 9 is inserted from the opening to close the rotating shaft 4 in the rotating shaft groove 13. The space of the rotating shaft groove 13 closed by the baffle 9 is adapted to the cross-section of the rotating shaft 4.
[0017] The preferred embodiments of the present invention described above are examples of the present invention. Other obvious variations or combinations are also within the scope of protection of the claims.
Claims
1. A moving contact of a molded case circuit breaker, comprising a moving contact frame, moving contact plates, and a connecting plate, wherein a rotating shaft is disposed within the moving contact frame, multiple moving contact plates are arranged side-by-side within the moving contact frame, the rotating shaft passes through the rear end of the moving contact plates, the front end of the moving contact plates extends out of the moving contact frame, a contact point is disposed below the top end of the moving contact plates, and the connecting plate is connected to the rotating shaft and tightly fitted with the moving contact plates, characterized in that: A tension spring is installed inside the moving contact frame, and a tension spring rod is installed at the bottom of the moving contact frame. The upper end of the tension spring is hung below the moving contact piece inside the moving contact frame, and the lower end is hung on the tension spring rod. A rotating shaft groove is formed inside the moving contact frame, and both ends of the rotating shaft are set in the rotating shaft groove. A baffle groove is opened laterally in the middle of the rotating shaft groove. An opening is formed on one side of the baffle groove, and a baffle is installed in the baffle groove. The baffle is inserted into the opening to close the rotating shaft in the rotating shaft groove.
2. The movable contact of a molded case circuit breaker of claim 1, wherein: A tension spring rod groove is provided below the moving contact frame, and the tension spring rod is set in the tension spring rod groove.
3. The movable contact of a molded case circuit breaker of claim 2, wherein: The tension spring rod has tension spring grooves at equal intervals, and the lower end of the tension spring is hung in the tension spring groove.
4. The moving contact of the molded case circuit breaker according to claim 3, characterized in that: Each of the moving contact pieces has two tension springs hanging below it, and two tension spring rods. The lower ends of the two tension springs are respectively hung on the two tension spring rods.
5. The movable contact of a molded case circuit breaker of claim 4, wherein: The moving contact piece is provided with two tension spring holes, the upper end of the tension spring is hung in the tension spring hole, and a triangular relief groove is formed below the tension spring hole to allow the tension spring to swing angle to be adapted.