Air Blower Vane Wheel Deformation Prevention
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Solution Overview
Problem
In air blowers, the vane wheel made of resin deforms due to differences in strength and linear expansion coefficients with the metallic holder, leading to balance loss, increased bearing load, vibration, and reduced product life when operated at high speeds or in high-temperature environments.
Innovation Solution
The air blower design incorporates a rotatable shaft with a cylindrical holder featuring first and second openings, where the vane wheel is fixed using thermally deformed protrusions that protrude from these openings, preventing separation and deformation by mechanical and adhesive means, such as thermal caulking and insert molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the vane wheel is fixed to the holder using conventional methods (insert molding or adhesive), then the assembly is simple to manufacture, but the vane wheel deforms due to differences in strength and linear expansion coefficients between the resin vane wheel and metallic holder when operated at high speeds or in high-temperature environments
Solution Approach 1:
The holder is divided into multiple sections with through-holes arranged in circumferential rows, allowing the vane wheel to be secured at multiple discrete points rather than as a single continuous structure. This segmentation enables differential movement and stress distribution, preventing deformation while maintaining manufacturing simplicity through modular assembly
Solution Approach 2:
The vane wheel is nested within the holder structure, with protrusions on the vane wheel inserted through the through-holes of the holder and secured with fixing members. This nested configuration allows the resin vane wheel to be mechanically integrated with the metallic holder while accommodating thermal expansion differences through the through-hole architecture
2Weight of moving object
If the vane wheel is made of resin to reduce weight, then the overall weight of the rotor is reduced, but the vane wheel deforms due to the difference in strength and linear expansion coefficient with the metallic holder when rotated at high speeds or in high-temperature environments
Solution Approach 1:
The holder is segmented with multiple through-holes arranged in circumferential rows, creating discrete attachment points that allow the resin vane wheel to be secured at multiple locations. This segmentation distributes mechanical stresses and accommodates thermal expansion differences, maintaining shape stability while preserving the weight advantage of using resin material
Solution Approach 2:
The system employs a composite structure combining resin vane wheel with metallic holder, leveraging the lightweight properties of resin while using the high strength and thermal stability of metal. The through-hole configuration with fixing members creates a hybrid construction that maintains shape stability under high-speed rotation and elevated temperatures
3Measurement precision
If balancing weight is added to the vane wheel to achieve high balance accuracy, then the rotor balance is improved, but the added weight increases the load on the bearing and may cause deformation of the resin vane wheel
Solution Approach 1:
The balancing weight is nested within the holder structure or integrated into the vane wheel assembly through the through-hole configuration, allowing precise balance adjustment without adding external components. This integrated approach minimizes additional bearing load while achieving high balance accuracy through strategic weight placement
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 effectively prevents vane wheel deformation, maintains rotor balance, reduces bearing loads, and minimizes vibration and noise, thereby extending the product's life and improving fan motor performance.
Implementation Method 1
the holder includes a top section including a plurality of first openings at one end thereof in the axial direction, and includes a flange including a plurality of second openings at the other end thereof, and the vane wheel includes first protrusions to be inserted into the first openings of the holder and fixed to the top section by deformed sections of the first protrusions outwardly protruding from the first openings
Data Source
AI summary
An air blower capable of preventing a deformation of the vane wheel is provided. A cylindrical holder is provided on rotatable shaft. A vane wheel is provided on the outer circumference of the holder. The holder includes a top section including a plurality of first openings at one end thereof in the axial direction, and includes a flange including a plurality of second openings at the other end thereof, and the vane wheel includes first protrusions to be inserted into the first openings of the holder and fixed to the top section by deformed sections protruding from the first openings, and second protrusions to be inserted into the second openings of the holder and fixed to flange by deformed sections protruding from the second openings.