Swept Blade Impeller Design for High Solidity and Efficiency
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Solution Overview
Problem
Conventional fan impellers face limitations in increasing blade solidity and number due to restricted blade length and stagger angle, leading to unsatisfactory operating efficiency and increased complexity and cost in design and fabrication.
Innovation Solution
The impeller design features blades with sweep-back and sweep-forward parts, arranged at the edge of the blade, allowing for increased blade count without overlap, with a stagger angle between 10 and 60 degrees, and specific radius relationships to enhance solidity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of blades is increased to enhance solidity and working efficiency, then the working efficiency is improved, but the blades overlap with each other and the design complexity and fabrication cost increase
Solution Approach 1:
The patent applies dimensionality change by transitioning from straight blades to swept blades, where the blade leading edge is swept backward and the trailing edge is swept forward. This spatial reconfiguration in the radial dimension allows increased blade count without overlap, resolving the contradiction between productivity (working efficiency) and device complexity.
Solution Approach 2:
The patent changes the geometric parameters of the blades by introducing sweep-back and sweep-forward angles. This parameter modification allows the blades to be arranged more densely without overlapping, enabling increased solidity and working efficiency while maintaining manageable design complexity.
2Quantity of substance
If large blades are used to increase solidity, then the solidity is enhanced, but every two adjacent blades possibly overlap with each other
Solution Approach 1:
The patent resolves the overlap issue by changing the spatial arrangement of blades from a straight configuration to a swept configuration. The sweep-back and sweep-forward geometry redistributes the blade positions in the radial dimension, preventing overlap while maintaining large blade area for high solidity.
Solution Approach 2:
The patent introduces curved geometry to the blades through sweep-back and sweep-forward design. This curvature allows the blades to navigate around each other in the rotational plane, preventing overlap while maintaining the necessary blade area for high solidity.
3Productivity
If the blade length is increased to enhance working efficiency, then the working efficiency is improved, but the stagger angle and number of blades are restricted by the hub perimeter
Solution Approach 1:
The patent resolves the restriction on blade length by introducing sweep geometry that extends the effective blade area without increasing the radial length from the hub. The sweep-back and sweep-forward configuration utilizes the tangential dimension to increase working efficiency while maintaining compatibility with hub perimeter constraints.
Data Source
AI summary
An impeller includes a hub and a plurality of blades. The blades are disposed around an outer periphery of the hub. Each of the blades includes a connecting end, a sweep-back part and a sweep-forward part. The connecting end is coupled with the hub. The sweep-back part is disposed at an edge of the blade and extended from the connecting end. An extending direction of the sweep-back part is opposed to a rotating direction of the impeller. The sweep-forward part is extended from the sweep-back part. An extending direction of the sweep-forward part is the same as the rotating direction of the impeller.