Air Circuit Breaker Breaking Spring Axial Assembly
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Solution Overview
Problem
The existing air circuit breakers face challenges in achieving a compact structure and simplifying the installation process of the breaking spring due to the closed loop shape of the first fixing part, which requires additional space and complicates the assembly process.
Innovation Solution
The breaking spring design includes a first fixing part with a hook-like shape and a fixing hole with an outward entrance, allowing the connection shaft to be inserted without needing additional space, and a tool with a hook part to simplify the installation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first fixing part is designed as a closed loop shape, then the breaking spring can be securely fixed, but additional space is required for assembly and the assembly process becomes complicated
Solution Approach 1:
The first fixing part is divided into two functional sections: a hook-like shape for securing the breaking spring and a separate fixing hole with an outward entrance for tool access. This segmentation allows the breaking spring to be fixed securely while enabling simple assembly through the outward-opening entrance without requiring complex axial movements or additional space.
2Reliability
If the first fixing part is designed as a closed loop shape, then the breaking spring can be securely fixed, but additional space is required at the end portion of the connection shaft
Solution Approach 1:
The fixing structure is segmented into a hook-like shape for secure attachment and a separate fixing hole with outward entrance. This allows the breaking spring to be securely fixed while the tool accesses through the outward opening, eliminating the need for additional axial space at the connection shaft end that would be required for a closed loop design.
3Ease of operation
If the fixing hole is designed with an outward entrance, then the assembly tool can access easily, but the structure becomes less symmetric
Solution Approach 1:
The fixing hole is deliberately designed with an asymmetric outward opening rather than a symmetric closed loop. This asymmetric design provides easy access for the assembly tool while the hook-like shape maintains the structural integrity and securing function. The asymmetry is functional rather than arbitrary, optimizing both assembly ease and structural performance.
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
This design enables a compact structure, simplifies the assembly tool, reduces assembly time, and lowers fabrication costs by eliminating the need for axial movement of the breaking spring during installation.
Implementation Method 1
a coil-shaped elastic member (57) interposed between the first and second fixing parts (51, 55)... the breaking spring (37) provides an elastic force for returning the movable contactor (38) to its initial state
Implementation Method 2
a closing spring (25) which has one end connected with a lower end portion of the driving lever (24) and the other end supported by the frame (9), and is compressed due to the rotation of the driving lever according to the rotation of the cam (22) to store elastic energy
Data Source
Figure 1
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AI summary
An air circuit breaker, a breaking spring of the air circuit breaker, and its connection method are disclosed. The air circuit breaker includes: a cam (22); a driving lever (24) connected with the cam and rotated; a closing spring (25) compressed by the driving lever (24); a plurality of links (29,34,35) that transfer a driving force generated when the closing spring is stretched; a switching shaft (3) connected with one or the links by a connection shaft (36) and rotated according to movement of the link; and a breaking spring (37) having a fixing hole (52,72) with one side opened at one end portion (51,70) thereof, so as to be fixed to the connection shaft (36) perpendicularly in an axial line direction of the connection shaft. A space for assembling does not need to be formed at an end portion of the connection shaft, obtaining a compact structure. In addition, a tool can be simplified, an installation can be facilitated, an assembling time can be shortened, and a fabrication cost can be reduced.