Centrifugal Impeller Reinforcement Ring for High-Speed Crack Prevention
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Solution Overview
Problem
Conventional centrifugal impellers in blowers, used in hand driers and vacuum cleaners, tend to break due to high motor speeds above 33000 RPM, leading to reduced lifespan due to cracks around the blade mounting holes near the air inlet.
Innovation Solution
A reinforcement ring is mounted around the air inlet of the centrifugal impeller, enhancing the strength of the cover plate and preventing breakage by distributing stress, while maintaining a lightweight design with a diameter ratio of 0.48 to 0.61 to the cover or base plate, and using rivet connections for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If motor speed is increased above 33000 RPM to improve blower performance, then productivity increases, but the centrifugal impeller breaks due to cracks around blade mounting holes
Solution Approach 1:
The reinforcement ring is pre-installed around the air inlet on the cover plate before blade assembly installation. This preliminary structural reinforcement prevents crack initiation at the blade mounting holes during high-speed operation, allowing the impeller to withstand speeds above 33000 RPM without failure.
Solution Approach 2:
The reinforcement function is separated from the cover plate by adding a distinct reinforcement ring component. This segmentation allows the reinforcement structure to be independently optimized and installed only where needed around the air inlet, strengthening the critical area without redesigning the entire cover plate.
2Reliability
If reinforcement ring diameter is increased to improve strength, then reliability increases, but device complexity and material usage increase
Solution Approach 1:
The reinforcement ring is positioned specifically around the air inlet where cracks typically initiate, rather than reinforcing the entire cover plate. The diameter is optimized to cover the critical blade mounting hole areas, providing localized strength enhancement with minimal additional material and structural complexity.
Data Source
AI summary
A blower has a centrifugal impeller driven by an electric motor. The centrifugal impeller has a base plate, a cover plate defining an air inlet, a plurality of blades mounted between the base plate and the cover plate, and a reinforcement ring mounted to the cover plate around the air inlet. The cover plate includes an outwardly extending flange at the air inlet. The reinforcement ring has a flange fitted around the flange of the cover plate. Each blade has cover plate mounting portions and base plate mounting portions. The cover plate has blade mounting holes engaged with the cover plate mounting portions. The base plate has blade mounting holes engaged with the base plate mounting portions. The reinforcement ring increases the strength of the cover plate, to avoid breakage under high speed rotation.