Magnetizable Nose Piece Balancing Boreless Compressor Wheel
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional boreless compressor wheels in turbochargers face challenges in balancing due to their non-magnetizable material composition, limiting the use of magnetic field sensing for unbalance measurement, and often require material removal from the wheel itself, which can lead to scrapage if further balancing is needed, as they typically allow only a single balance cut.
Innovation Solution
A nose piece made of magnetizable material is used with a boreless compressor wheel, allowing for unbalance measurement and correction via magnetic field sensing, and can be removed and replaced to facilitate additional balancing cuts without scrapping the wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If material removal is performed directly on the boreless compressor wheel for balancing, then the wheel can be balanced, but the wheel cannot withstand further balancing operations and must be scrapped
Solution Approach 1:
The balancing function is segmented from the wheel structure by introducing a separate nose piece that can be removed and replaced. The nose piece serves as a sacrificial element that absorbs the material removal operations, protecting the wheel from damage while enabling multiple balancing iterations.
Solution Approach 2:
The nose piece acts as an intermediary component between the balancing operation and the wheel. It provides a removable surface for material removal while the wheel itself remains intact, allowing the wheel to be reused after balancing operations on the nose piece.
2Measurement precision
If conventional balancing methods are used on boreless compressor wheels, then the wheel structure is preserved, but magnetic field sensing cannot be used for unbalance measurement
Solution Approach 1:
The nose piece serves as a magnetic intermediary, providing a magnetizable surface that enables magnetic field sensing for unbalance measurement. This allows the use of simpler and more accurate magnetic sensors instead of complex optical sensing systems.
Solution Approach 2:
The introduction of the magnetizable nose piece changes the magnetic properties of the assembly interface, enabling magnetic field sensing. This parameter change allows for more precise unbalance measurement through magnetic field detection.
3Measurement precision
If the nose piece is made of magnetizable material, then magnetic field sensing can be used for unbalance measurement, but the nose piece requires additional material for magnetization
Solution Approach 1:
The nose piece is designed as a disposable or replaceable component that can be easily manufactured and exchanged. Its low cost and replaceability justify the use of magnetizable material, as any material consumption or complexity is offset by the ability to simply replace the nose piece rather than the entire wheel assembly.
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 approach enables precise unbalance measurement and correction, extending the number of balance cuts possible on boreless compressor wheels, reducing waste, and improving rotor dynamic performance by allowing for more effective material removal from the nose piece rather than the wheel, thus enhancing the durability and efficiency of turbocharger balancing.
Implementation Method 1
a magnetic field sensor, the lock nut is magnetized (i.e., made of a magentizable material)... For a magnetic field sensor, the lock nut is magnetized
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An assembly includes a nose piece (430) and a boreless compressor wheel (420) having a nose end configured for receipt of the nose piece (430) and a receptacle (422) at a base end (426) configured for receipt of a rotatable shaft (401). A method includes fitting a nose piece (430) to a boreless compressor wheel (420), measuring unbalance and, based in part on the measuring, removing material from the nose piece (430).