Rotatable Static Contact for Circuit Breaker Arc Blow-Out
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Solution Overview
Problem
Traditional circuit breakers with fixed static contacts require additional elements to prevent axial deviation, leading to complex assembly processes and reduced efficiency, as only the moving contact is rotatable, resulting in a smaller contact area and slower arcing speed.
Innovation Solution
A rotatable static contact device with central and bearing limiting step surfaces and snap spring grooves limits axial movement of the static contact, allowing it to be fixed and rotatable, generating a repulsive force for arc blow-out and preventing axial deviation, thus simplifying assembly and maintaining contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional elements (shaft sleeves) are arranged to prevent axial deviation of the static contact, then axial deviation is prevented, but the structure becomes more complex and assembly efficiency decreases
Solution Approach 1:
The patent merges the axial limiting function with the existing shaft structure by providing limiting step surfaces directly on the central shaft and bearing shaft. This eliminates the need for separate shaft sleeves, reducing structural complexity while maintaining the axial deviation prevention function.
Solution Approach 2:
The central shaft and bearing shaft are designed to perform multiple functions: supporting the static contact, enabling rotation, and preventing axial deviation through their integrated limiting step surfaces. This multi-functionality reduces the number of separate components needed.
2Reliability
If additional elements (shaft sleeves) are arranged to prevent axial deviation of the static contact, then axial deviation is prevented, but the assembly process becomes more tedious and efficiency is reduced
Solution Approach 1:
The axial limiting function is combined with the existing shaft structure through integrated limiting step surfaces, eliminating the need for separate shaft sleeves. This reduces the number of assembly steps and improves assembly efficiency while maintaining axial deviation prevention.
3Device complexity
If only the moving contact is made rotatable, then the structure is simpler, but the contact area is smaller and arcing speed is slower
Solution Approach 1:
The patent inverts the conventional design by making the static contact rotatable instead of (or in addition to) the moving contact. This allows both contacts to overturn simultaneously during breaking, generating stronger repulsive force and improving arc blow-out speed without significantly increasing structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents axial deviation of the static contact, enhances arc blow-out, and simplifies the assembly process by integrating limiting components directly into the static contact support, improving efficiency and maintaining contact area without additional elements.
Implementation Method 1
a static contact spring (50) and a locating shaft (70) which are used for mounting the static contact spring (50); the static contact spring (50) presses a static contact (10) against a moving contact
Implementation Method 2
a rotatable function of the static contact mainly serves to generate a repulsive force on the contact to allow a moving contact and the static contact to overturn at the same time by using a short-circuited current flowing through the moving contact and the static contact, and then an electric arc is prolonged and arc blow-out is accelerated
Data Source
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AI summary
A contact device having a rotatable static contact and of a circuit breaker comprises a static contact that is embedded in a static contact support. The static contact support is internally provided with a static contact spring and a locating shaft used for mounting the static contact spring. The static contact support is further internally provided with a shaft body passing through the static contact. The shaft body comprises a central shaft passing through the axis of rotation of the static contact, and a bearing shaft passing through the static contact and limiting the static contact spring. A locating shaft (70) is sleeved with the static contact spring. Spring arms extending out from two ends are snapped to the bearing shaft passing through the static contact. The static contact of the device of the invention is rotatably mounted on the static contact support, a repulsive force is generated on the contact to allow a moving contact and the static contact to overturn at the same time, and then an electric arc is prolonged and arc blow-out is accelerated. A step surface passing through the shaft body of the static contact is used for limiting the two sides of the static contact to effectively prevent the static contact from moving in the axial direction of the shaft body, ensure a contact area of the moving contact and the static contact, effectively reduce assembling difficulty and improve assembling efficiency.