Curved Impeller Blades for Higher Static Pressure and Airflow
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Solution Overview
Problem
Known impellers experience a decrease in static pressure and air blowing efficiency due to the design of their blade portions.
Innovation Solution
The impeller design includes blade portions that are curved convexly toward the downstream side in the air blowing direction and inclined toward the upstream side, with a narrower width at the leading edge and overlapping ends, enhancing static pressure and airflow volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the blade portions are designed with a conventional straight or simple curved shape, then the manufacturing is simple, but the static pressure and air blowing efficiency decrease
Solution Approach 1:
The blade portions are designed with a specific curvature where the convex side faces the downstream side in the air blowing direction at the front side in the rotation direction. This curved geometry optimizes airflow patterns, increases static pressure, and improves air blowing efficiency while remaining manufacturable using conventional processes.
2Quantity of substance
If the blade portions are inclined toward the upstream side, then the airflow volume increases, but the rotation load increases
Solution Approach 1:
The blade portions have different geometric characteristics at different locations: they are inclined toward the upstream side to increase airflow volume, while having a convex curvature at the front side to reduce rotation load. This local differentiation of geometric properties allows simultaneous optimization of both airflow volume and rotational characteristics.
3Quantity of substance
If the blade portions have a wider width at the leading edge, then the airflow volume increases, but the static pressure decreases
Solution Approach 1:
The convex curvature of the blade portions at the front side in the rotation direction creates a pressure distribution that maintains high static pressure while allowing sufficient blade width for adequate airflow volume. The curved geometry guides airflow smoothly, preventing pressure loss that would occur with simpler blade designs.
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 improves the static pressure and air blowing efficiency by reducing rotation load and increasing airflow volume, resulting in a more efficient air blowing apparatus.
Implementation Method 1
Each of the blade portions is curved to be convex toward a downstream side in an air blowing direction at a front side in a rotation direction with respect to a center in a circumferential direction
Data Source
AI summary
An impeller includes a body portion having a tubular shape and a plurality of blade portions. The body portion is rotatable about a center axis. The plurality of blade portions protrude in a radial direction from an outer circumferential surface of the body portion and are arranged at intervals in a circumferential direction. When the blade portions rotate about the center axis, the impeller blows air in an axial direction. Each of the blade portions extends in the circumferential direction while being inclined to an upstream side in an air blowing direction toward a front side in a rotation direction. Each of the blade portions is curved to be convex toward a downstream side in the air blowing direction at the front side in the rotation direction with respect to a center in the circumferential direction.