Backpack Blower Mixed Flow Fan Air Power Efficiency
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Solution Overview
Problem
Existing outdoor power blowers face challenges in achieving efficient and compact designs, with centrifugal fans being inefficient and axial fans lacking power, while electric-powered blowers require a balance between efficiency and compactness.
Innovation Solution
A backpack blower incorporating a mixed-flow fan with a frame assembly that supports an electric power pack and discharge tube assembly, featuring a mixed-flow fan with both radial and axial velocity components, allowing for efficient airflow in a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a centrifugal fan is used, then air power is improved, but efficiency deteriorates and packaging becomes difficult
Solution Approach 1:
The patent changes the flow pattern parameter from purely centrifugal to mixed-flow, combining radial and axial velocity components. This parameter change allows the fan to achieve both high air power and high efficiency by optimizing the balance between pressure generation and airflow movement.
Solution Approach 2:
The fan design incorporates variable blade angles and optimized blade geometry that dynamically adjust the flow characteristics. This allows the system to maintain optimal performance across different operating conditions, achieving both power and efficiency.
2Volume of moving object
If an axial fan is used, then compactness and efficiency are improved, but air power deteriorates
Solution Approach 1:
The patent modifies the flow pattern parameter from purely axial to mixed-flow, incorporating radial velocity components while maintaining axial flow characteristics. This parameter change enables the compact axial fan design to generate higher air power without sacrificing efficiency or compactness.
3Power
If a mixed-flow fan is used, then efficiency and power are improved, but device complexity increases
Solution Approach 1:
The patent merges the advantages of centrifugal and axial fan designs into a single mixed-flow fan configuration. By combining the pressure-generating capability of centrifugal fans with the efficient axial flow characteristics, the design achieves both power and efficiency without requiring multiple separate components or complex systems.
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 backpack blower achieves efficient high-power operation in a compact package by utilizing a mixed-flow fan, combining the efficiency of axial blowers with the power of centrifugal blowers, and enabling a more compact layout by strategically placing the fan and electric power pack.
Implementation Method 1
a mixed-flow fan with both radial and axial velocity components
Data Source
AI summary
This disclosure provides a backpack blower with mixed flow fan. The backpack blower includes a frame assembly, a fan connected to the frame assembly and a discharge tube assembly connected to the fan. The frame assembly used to support an electric power pack for storing and discharging electric energy. The fan includes a fan housing provided with a protruding portion and extending from an inlet end and an outlet end, and an impeller housed in the fan housing. The blade of the impeller is configured to guide airflow to have both a radial velocity component and an axial velocity component.