Multi-Pole Circuit Breaker Auxiliary Support Design
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Solution Overview
Problem
The existing rotation axis support structures in multi-pole circuit breakers suffer from unbalanced contact pressure, instability, and complex design issues, leading to reduced operational efficiency and increased production costs, particularly in multi-pole configurations with independent single-pole units.
Innovation Solution
A multi-pole circuit breaker design featuring a rotation axis assembly with auxiliary supports, including a supporting rod and auxiliary support rods that provide stable multipoint support, ensuring balanced contact pressure and simplified structure, enhanced by the use of rolling or sliding bearings for precise alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotation axis is used to support multiple support shaft parts in a multi-pole circuit breaker, then the contact system can be synchronized across multiple poles, but the rotation axis becomes long and prone to twisting, reducing revolving precision and causing unbalanced contact pressure
Solution Approach 1:
The rotation axis is divided into multiple segments, each supported by independent bearing assemblies positioned at different locations along the axis. This segmentation prevents the long rotation axis from twisting as a single piece, maintaining revolving precision while still enabling synchronized operation across multiple poles through the interconnected bearing support structure
Solution Approach 2:
Bearing assemblies are introduced as intermediary components between the rotation axis and the housing structure. These bearings act as mediators that support the rotation axis, reduce friction, and maintain precise rotational alignment, thereby solving the twisting problem of long rotation axes while preserving multi-pole synchronization capability
2Extent of automation
If a long rotation axis is used to connect multiple support shaft parts, then all poles can be controlled by a single operating mechanism, but obvious twist is formed during revolution, causing delayed movement of distant movable contacts and unbalanced contact pressure
Solution Approach 1:
The rotation axis is segmented into multiple sections, each section being supported by its own bearing assembly. This segmentation prevents the accumulation of torsional stress and twisting along the length of the rotation axis, ensuring that all support shaft parts including distant ones move simultaneously and maintain balanced contact pressure, thus preserving reliable operation under single mechanism control
Solution Approach 2:
The support structure is extended into the spatial dimension by positioning bearing assemblies at multiple locations along the rotation axis rather than relying on a single support point. This dimensional distribution of support points prevents twisting by providing distributed structural reinforcement, ensuring synchronized movement and balanced contact pressure across all poles
3Adaptability or versatility
If the rotation axis penetrates through partitioning walls of extinguishing chambers, then movable contacts can be installed in respective chambers, but the supporting structure becomes complex with difficult installation and debugging
Solution Approach 1:
The bearing assemblies serve multiple functions simultaneously: they support the rotation axis, provide precise rotational bearings, and act as mounting interfaces that simplify the penetration through partitioning walls. This multi-functionality reduces the overall complexity of the supporting structure while maintaining the necessary arc extinguishing isolation between chambers
Solution Approach 2:
The bearing assemblies are pre-installed on the rotation axis before the assembly is positioned through the partitioning walls. This preliminary action simplifies the installation process by preparing the support structure in advance, making the subsequent passage through partition walls and final positioning much easier and more straightforward
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 significantly improves the stability and reliability of the rotation axis, balances contact pressure, reduces manufacturing difficulties, and enhances the overall performance and service life of the circuit breaker while being adaptable to various housing configurations.
Implementation Method 1
an auxiliary support bearing installed in an auxiliary support... a bearing installed in the auxiliary support
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention discloses a multi-pole circuit breaker with auxiliary supports, which comprises a base, a plurality of single-pole circuit breaking units, an operating mechanism and a rotation axis assembly, wherein the rotation axis assembly consists of a plurality of supporting assemblies and a plurality of support shaft parts in series; each of the support shaft parts is provided with a movable contact bridge; each of the supporting assembly consists of a rotation axis, an auxiliary support, an auxiliary support bearing and at least one supporting rod; the rotation axis maintains synchronous revolution with the support shaft parts; the outside of the bearing is tightly assembled with a bearing hole of the auxiliary support, while the inside is tightly assembled with the rotation axis; the supporting rod is tightly assembled with a supporting rod installing hole on the auxiliary support; the operating mechanism is fixedly connected with the supporting rod; and the supporting rod is fixedly installed on a housing of the single-pole circuit breaking unit and provides stable supporting force for the rotation axis through the auxiliary supports. The multi-pole circuit breaker has balanced contact pressure at each contact point, flexible operation, fast breaking, good breaking synchronism of contacts at all poles and long service life.