Current limiting structure static contact in circuit breaker
By designing the current limiting structure static contacts in the circuit breaker, using a spiral static contact bridge and U-shaped static contact part, the existing circuit breakers have solved the problems of poor current limiting effect and large size and high cost in the short circuit test, and the advantages of miniaturization and low cost are achieved.
Patent Information
- Application Number
- CN202422315423.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-23
AI Technical Summary
The static contacts of existing low-ampere circuit breakers have poor current limiting effect in short-circuit tests, resulting in hot bimetallic sheet fuse, reducing product pass rate and reliability, while large-size design limits its application in narrow environments and high cost problems.
A static contact with a current limiting structure in the circuit breaker is designed, including a connecting part, a static touch bridge and a removable static touch part. The static touch bridge is spiral flat, the connecting part and the static touch bridge are integrally formed, with a hollow groove in the middle, and the static touch part is U-shaped, with high material utilization, which is suitable for small space environments.
It realizes miniaturized design, reduces costs, improves material utilization, is suitable for small spaces, and improves product qualification rate and reliability.
Smart Images
Figure CN223140707U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a static contact of a current-limiting structure inside a circuit breaker. Background Art
[0002] For existing low-ampere circuit breakers, the static contacts have poor current-limiting effects during the short-circuit test of the product, and the thermal bimetal strips are easily melted during the test, greatly reducing the qualification rate of product tests and the reliability of product use.
[0003] To solve the above problems, some circuit breakers directly use high-resistance materials for the static contacts. However, due to the high hardness, poor forming process, and great tapping difficulty of these materials, the qualification rate of parts is very low; moreover, the structural design of these static contacts is general, and to ensure performance, their sizes are relatively large, resulting in their inability to be applied in relatively narrow base environments, and the large size will inevitably use more materials and have a higher cost. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a static contact of a current-limiting structure inside a circuit breaker. The utility model has the advantages of ingenious design, relatively small size, and relatively low cost.
[0005] The technical solution of the utility model: A static contact of a current-limiting structure inside a circuit breaker includes a connecting part, a static contact bridge, and a static contact part detachably arranged on the static contact bridge; the static contact bridge is arranged in a spiral and flat shape, and an empty slot for installing the static contact part is opened in the middle of the static contact bridge; the front side of the connecting part is connected to the end of the outermost circle of the static contact bridge through a lower bending part.
[0006] In the aforementioned static contact of the current-limiting structure inside a circuit breaker, the static contact part is in a U-shaped bent shape, and the static contact part includes an arc-leading angle corresponding to the connecting part and inclined and bent towards the connecting part, a bent part in a U-shaped bend, and an installation part arranged at the end of the bent part.
[0007] In the aforementioned static contact of the current-limiting structure inside a circuit breaker, an installation seat corresponding to the installation part is arranged at the end of the innermost circle of the static contact bridge.
[0008] In the aforementioned static contact of the current-limiting structure inside a circuit breaker, an empty slot is opened in the middle of the bent part.
[0009] Compared with the prior art, the utility model includes a connecting part, a static contact bridge, and a static contact part detachably connected to the static contact bridge. The connecting part and the static contact bridge are integrally formed. The static contact bridge is arranged in a spiral and flat shape, and an empty slot for installing the static contact part is opened in the middle;
[0010] By ingeniously designing the shapes of the connecting part and the static contact bridge, the overall structure is simple and regular, the material utilization rate is high, it is convenient to be integrally formed directly, and the cost is relatively low;
[0011] The static contact bridge is tiled in a spiral shape, effectively reducing the overall size and can be applied to narrow spaces.
[0012] Therefore, the utility model has the advantages of ingenious design, relatively small size and relatively low cost. Description of the Drawings
[0013] Figure 1 is a schematic structural diagram of the utility model;
[0014] Figure 2 is a top view of the utility model;
[0015] Figure 3 is a bottom view of the utility model.
[0016] Reference numerals in the drawings: 1 - connecting part, 11 - lower bending part, 2 - static contact bridge, 21 - mounting seat, 3 - static contact part, 31 - arc - starting angle, 32 - bending part, 33 - mounting part. Detailed Embodiment
[0017] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.
[0018] Embodiment. A static contact of a current - limiting structure inside a circuit breaker, as Figures 1-3 shown, includes a connecting part 1, a static contact bridge 2 and a static contact part 3 detachably arranged on the static contact bridge 2; the static contact bridge 2 is tiled in a spiral shape, and an empty groove for installing the static contact part 3 is opened in the middle of the static contact bridge 2; the front side of the connecting part 1 is connected to the end of the outermost circle of the static contact bridge 2 through a lower bending part 11.
[0019] The static contact part 3 is U - shaped and bent, and the static contact part 3 includes an arc - starting angle 31 corresponding to the connecting part 1 and inclined and bent towards the connecting part 1, a bending part 32 bent in a U - shape, and a mounting part 33 arranged at the end of the bending part 32.
[0020] A mounting seat 21 corresponding to the mounting part 33 is arranged at the end of the innermost circle of the static contact bridge 2.
[0021] An empty groove is opened in the middle of the bending part 32.
Claims
1. A static contact of a current-limiting structure inside a circuit breaker, characterized in that: It includes a connecting part (1), a static contact bridge (2), and a static contact part (3) detachably arranged on the static contact bridge (2); the static contact bridge (2) is arranged in a spiral and laid flat, and an empty groove for installing the static contact part (3) is opened in the middle of the static contact bridge (2); the front side of the connecting part (1) is connected to the end of the outermost circle of the static contact bridge (2) through a lower bending part (11).
2. The static contact of a current-limiting structure inside a circuit breaker according to claim 1, characterized in that: The static contact part (3) is U-shaped and bent, and the static contact part (3) includes an arc-leading angle (31) whose upper part corresponds to the connecting part (1) and is inclined and bent towards the connecting part (1), a bending part (32) bent in a U shape, and a mounting part (33) arranged at the end of the bending part (32).
3. The static contact of a current-limiting structure inside a circuit breaker according to claim 2, wherein: A mounting seat (21) corresponding to the mounting part (33) is arranged at the end of the innermost circle of the static contact bridge (2).
4. The static contact of a current-limiting structure inside a circuit breaker according to claim 2, characterized in that: An empty groove is opened in the middle of the bending part (32).