Centrifugal Air Blower Geometry for Higher Airflow and Lower Motor Load
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Solution Overview
Problem
Centrifugal air blowers face challenges in enhancing airflow while reducing motor load to achieve energy savings.
Innovation Solution
The design of a centrifugal air blower with specific ratios for the impeller and suction port diameters (0.5<h/H<0.8 and 0.78<d/D<0.84), along with optimized curvature radii (20 mm<R1<27 mm and 85 mm<R2<110 mm) and angle settings (approaching 90 degrees) for the side plate, to balance airflow enhancement and motor load reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the airflow amount is enhanced by improving impeller shape, then the airflow performance is improved, but the motor load is not reduced
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric ratios of the air blower components. Specifically, it sets the blow-out port height to suction port height ratio (h/H) between 0.5-0.8, the suction port diameter to impeller diameter ratio (d/D) between 0.78-0.84, and the impeller diameter to blow-out port diameter ratio (D/d) between 1.16-1.28. These parameter optimizations enable simultaneous improvement of airflow amount and reduction of motor load, resolving the technical contradiction between productivity and energy consumption.
2Productivity
If the impeller diameter is increased to enhance airflow, then the airflow amount increases, but the device complexity and space requirements increase
Solution Approach 1:
The patent optimizes the diameter ratios to achieve compact design. By setting d/D between 0.78-0.84 and D/d between 1.16-1.28, the design achieves maximum airflow efficiency within a constrained impeller volume, avoiding the need for larger impeller diameters while maintaining high productivity.
Solution Approach 2:
The patent employs curved line portions with optimized radius of curvature in the side plate design (R1 between 20-27mm, R2 between 85-110mm). This curvature optimization improves airflow patterns and reduces turbulence, enabling enhanced airflow performance without increasing the overall impeller volume or device complexity.
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 simultaneously increases airflow and reduces motor load, with further motor load reduction achieved under conditions of h/H=0.65 and 0.80<d/D<0.83, optimizing performance for energy efficiency.
Implementation Method 1
centrifugal air blower having an impeller comprising a main plate and a plurality of vanes, and a side plate having a suction port and a blow-out port
Data Source
AI summary
There is provided a centrifugal air blower that can reduce driving force (consumed driving force) when an air blower is rotated, and also increase an airflow amount of air to be blown out from the air blower.A centrifugal air blower having an impeller 1 comprising a main plate 3 and plural vanes 2, and a side plate having a suction port and a blow-out port is characterized in that when the height of the suction port is represented by H, the height of the blow-out port is represented by h, the diameter of the impeller is represented by D and the diameter of the suction port is represented by d, 0.5<h/H<0.8 and 0.78<d/D<0.84 are satisfied.