Centrifugal Blower Impeller Layout for Reduced Vibration
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Solution Overview
Problem
There is a need to reduce the axial distance between the center of gravity of an impeller and the motor support position in centrifugal blowers to minimize vibrations caused by centrifugal force-induced imbalances.
Innovation Solution
The design includes a main plate with a larger weight than the side plate, both inclined towards the outer side in the radial direction, to displace the center of gravity and reduce positional deviation, thereby limiting vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the plate thickness of the main plate is progressively increased from the rotational axis side to an outer periphery, then the weight of the main plate increases and the center of gravity is displaced axially, but the axial distance from the motor support position to the center of gravity increases
Solution Approach 1:
The main plate is designed with asymmetric thickness distribution, being thicker at the outer periphery and thinner at the rotational axis side. This asymmetric configuration displaces the center of gravity radially outward while maintaining a compact axial profile, resolving the contradiction between increasing weight for balance and minimizing axial distance.
Solution Approach 2:
Instead of increasing plate thickness uniformly in the axial direction, the invention transitions to radial dimension by increasing thickness from the rotational axis toward the outer periphery. This dimensional shift allows the center of gravity to be positioned more effectively, reducing axial distance while still achieving the necessary weight for balance.
2Manufacturing precision
If the main plate and side plate are both inclined toward the outer side in the radial direction, then the center of gravity is displaced to reduce positional deviation, but the structural complexity increases
Solution Approach 1:
The main plate and side plate are designed with coordinated inclination angles that allow their combined mass distribution to shift the center of gravity. By merging the functional roles of both plates in achieving balance, the design achieves precise positioning without requiring complex additional components or mechanisms.
Solution Approach 2:
The inclination angles of the main plate and side plate are optimized as key parameters to control the center of gravity position. By adjusting these angular parameters, the design achieves minimal positional deviation between the motor support position and center of gravity while maintaining relatively simple structural forms.
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 configuration effectively reduces the positional deviation between the motor support position and the center of gravity, limiting vibrations and improving stability in centrifugal blowers.
Implementation Method 1
limit vibrations caused by centrifugal force-induced imbalances
Data Source
AI summary
A centrifugal blower includes a case, an electric motor supported by the case at a motor support position, and a fan driven by the electric motor. The fan includes: a boss installed to an output shaft; a main plate extending outward from the boss in a radial direction; a plurality of blades extending from the main plate toward one side in an axial direction; and a side plate joined to an end portion of each of the plurality of blades, which faces the one side in the axial direction. A weight of the main plate is larger than a weight of the side plate. The main plate and the side plate are both inclined toward another side opposite to the one side in the axial direction as the main plate and the side plate approach an outer side in the radial direction.