Handheld Blower Fan Geometry for Lower-Energy Airflow
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Solution Overview
Problem
Existing handheld blowers face inefficiencies in airflow management and energy consumption due to suboptimal design ratios and configurations of fan blades, air ducts, and motor placement, leading to increased energy requirements and reduced airflow efficiency.
Innovation Solution
The handheld blower features a fan with specific radius ratios, a compact air duct design with constant annular cross-sectional areas, and a motor placement that optimizes airflow efficiency, along with optional attachments like nozzles and light sources for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional fan blade designs are used, then manufacturing is simpler, but airflow efficiency is reduced and energy consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing the fan blade geometry parameters, specifically setting the ratio of fan hub radius to blade tip radius between 0.6 and 0.8, and the ratio of air duct radius to intake length between 0.4 and 0.5. These parameter optimizations improve airflow efficiency while reducing energy consumption compared to traditional designs.
2Volume of moving object
If compact air duct design is used, then device size is reduced, but airflow management becomes more challenging
Solution Approach 1:
The patent resolves this contradiction by optimizing the air duct geometry parameters, specifically the ratio of air duct radius to intake length between 0.4 and 0.5. This parameter optimization enables compact device size while maintaining efficient airflow management through the optimized duct dimensions.
3Productivity
If optimized fan blade radius ratios are used, then airflow efficiency increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges (fan hub radius to blade tip radius ratio between 0.6 and 0.8) that balance manufacturing feasibility with performance optimization. These ranges provide clear manufacturing targets while achieving improved airflow efficiency, avoiding overly stringent precision requirements.
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
The optimized design reduces energy consumption, increases airflow efficiency, and provides versatile usage options through attachments, enhancing user experience and operational performance.
Implementation Method 1
a fan configured to rotate about the duct axis
Data Source
AI summary
A handheld blower including a housing, an air duct defining a duct axis, the air duct including an air inlet and an air outlet opposite the air inlet, and a handle. The handle at least partially defining a battery receiving cavity configured to receive at least a portion of a battery pack therein, where the handle defines a grip axis, and where the grip axis is parallel to the duct axis.