Battery Fan Airflow Optimization via Shield Channel Design
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Solution Overview
Problem
Existing fans driven by direct current struggle to achieve a large total air volume efficiently, particularly when powered by battery packs, as they often fall short in meeting varying requirements for wind speed and air volume across different application scenarios.
Innovation Solution
The design incorporates a battery pack coupling portion, fan blades driven by an electric motor with multiple rotational speeds, a front shield with air guide ribs forming multiple outlet channels, and a rear shield with air inlet channels, optimizing airflow through a combination of motor speed, shield geometry, and channel design to achieve a high total air volume and efficient airflow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fan is powered by a battery pack, then portability and ease of use are improved, but the total air volume is limited due to battery constraints
Solution Approach 1:
The patent applies parameter changes by optimizing the motor's rotational speed parameters and the shield's geometric parameters (area, channel dimensions) to maximize air volume output within battery power constraints. The motor is designed to operate at specific rotational speeds that achieve 800-1800 CFM, and the shield's effective air outlet area is carefully dimensioned to achieve the target air volume to area ratio of 500-2000 m/min.
2Productivity
If the total air volume is increased, then the fan meets diverse application requirements, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the air outlet into multiple channels through front air guide ribs on the shield. This creates multiple flow paths that collectively achieve high total air volume while maintaining a compact structure. The segmentation of airflow into distinct channels increases the effective air outlet area without proportionally increasing overall device complexity.
Solution Approach 2:
The shield structure serves multiple functions: it defines the effective air outlet area, creates multiple air outlet channels through front air guide ribs, and maintains structural integrity. This multi-functionality allows the same component to contribute to both air volume generation and structural stability, reducing overall device complexity.
3Productivity
If the air outlet area is increased, then the total air volume increases, but the wind speed decreases
Solution Approach 1:
The patent resolves this contradiction by optimizing the ratio of total air volume to effective air outlet area to fall within 500-2000 m/min. This parameter optimization ensures that while the effective air outlet area is sufficient to achieve 800-1800 CFM, the wind speed remains within acceptable ranges for various applications. The motor rotational speed is also optimized to maintain appropriate wind speed despite the increased outlet area.
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 enables the fan to produce a total air volume of 800 CFM to 1800 CFM, with a ratio of air volume to effective outlet area exceeding 500 m/min, ensuring efficient airflow and adaptability across different usage scenarios while being powered by a battery pack within a rated voltage of 12 V to 80 V.
Implementation Method 1
fan blades capable of being driven by an electric motor to rotate about a central axis
Implementation Method 2
when the fan blades rotate, an airflow flows out through the front shield... when the fan blades rotate, the airflow flows in through the rear shield
Data Source
AI summary
A fan includes fan blades driven by an electric motor to rotate; a front shield at a front end of the fan blades; a rear shield at a rear end of the fan blades; and a battery pack coupling portion configured for mounting a battery pack. The electric motor of the fan has at least a first rotational speed at which the electric motor is operable, and when the electric motor moves at the first rotational speed, a total air volume formed by the fan is greater than or equal to 800 CFM and less than or equal to 1800 CFM.