Threaded Rotor Shaft Coupling for Easier Broken-End Removal
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Solution Overview
Problem
Existing rotor shaft couplings in molten metal pumps and degassers tend to break at the point of application, necessitating difficult removal of the broken end from the coupling.
Innovation Solution
A coupling design with a threaded protrusion and matching bore in the rotor shaft, allowing the broken end to be easily unthreaded or chiseled off, reducing the complexity of removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a traditional rotor shaft coupling design is used, then the coupling provides structural support and connection, but when the rotor shaft breaks, the broken end becomes difficult to remove from the coupling
Solution Approach 1:
The coupling is segmented into distinct functional zones: a threaded protrusion extending from the coupling body, and a cavity positioned above the protrusion. This segmentation allows the broken rotor shaft end to be removed by unscrewing from the threaded protrusion, separating the removal function from the overall coupling structure and enabling easy extraction without damaging the coupling body.
Solution Approach 2:
The threaded protrusion acts as an intermediary element between the coupling body and the rotor shaft. It provides a controlled interface for attachment and removal, mediating the connection in a way that allows the broken shaft end to be unscrewed and extracted, while the cavity serves as an intermediary space that guides and contains the removal process.
2Loss of time
If the coupling structure is simplified for easier removal, then maintenance time is reduced, but the structural integrity and support may be compromised
Solution Approach 1:
By segmenting the coupling into a main body and an integrated threaded protrusion, the design maintains the structural integrity of the main coupling body while providing a dedicated, simple threaded interface for the rotor shaft connection. This segmentation allows rapid unscrewing and removal of broken shaft ends, significantly reducing maintenance time without compromising the overall strength and support function of the coupling structure.
Data Source
AI summary
A coupling has an opening and a protrusion extending downward from the opening. The protrusion has threads that are preferably positioned outside of the opening. A rotor shaft that connects to the coupling has an internal bore with threads that receives and retains the protrusion, such as by a threaded connection between the two, so the protrusion applies driving force to the shaft.