Mixed-Flow Portable Fan Booster for Higher Air Pressure
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Solution Overview
Problem
Existing portable fans face issues with low air pressure, limited air supply distance, safety concerns due to visible blades, excessive noise, and high cost, making them unsuitable for diverse user needs and scenarios.
Innovation Solution
A portable fan design featuring a mixed-flow fan and booster structure with a housing, air inlet and outlet portions, and a pressurizing member that enhances air pressure and reduces noise, while ensuring compact size and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If axial fan blades are used, then air volume loss is reduced, but air pressure is low and air supply distance is short
Solution Approach 1:
The fan blade is divided into multiple independent airfoil sections along the span, each with optimized angle and curvature, allowing simultaneous optimization for both air volume and air pressure without compromising the other
Solution Approach 2:
The patent applies airfoil theory to change the geometric parameters of the blade cross-section, including thickness distribution, camber, and angle of attack, transforming the traditional flat blade into a three-dimensional airfoil structure that generates both high air volume and air pressure
2Loss of energy
If axial fan blades are used, then air volume loss is reduced, but safety is compromised due to visible blades
Solution Approach 1:
A protective cover is introduced as an intermediary component between the user and the rotating blades. The cover contains the blades while allowing airflow to pass through, eliminating direct contact hazards while preserving the fan's air volume performance
3Stress or pressure
If centrifugal fan blades are used, then air pressure is increased, but air volume loss is severe
Solution Approach 1:
Instead of using centrifugal force to push air radially outward (which causes volume loss), the patent inverts the approach by using axial airfoil blades that generate lift to move air parallel to the rotation axis, achieving pressure increase without significant volume loss
4Stress or pressure
If ultra-high-speed fans are used to achieve air volume, then air pressure is improved, but device size becomes large and cost increases
Solution Approach 1:
The patent changes the operational parameters by optimizing blade geometry for high efficiency at moderate speeds, using airfoil theory to maximize lift-to-drag ratio, allowing the fan to achieve high air pressure without requiring ultra-high rotation speeds that would increase size and cost
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 design achieves increased air pressure and distance, reduced noise, and improved safety, meeting user needs with a cost-effective and aesthetically pleasing solution.
Implementation Method 1
the mixed-flow fan is configured to rotate around a rotation shaft to generate an airflow
Implementation Method 2
a portable fan with large air volume and large air pressure... mixed-flow fan... booster
Data Source
Figure 1
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AI summary
A portable fan includes: a housing; a mixed-flow fan; and a booster. An air inlet portion is arranged at a rear side of the housing, an air outlet portion is arranged at a front side of the housing, the air inlet portion and the air outlet portion are fluidly communicated to each other through an interior of the housing. The mixed-flow fan is arranged inside the housing; wherein the mixed-flow fan is configured to rotate around a rotation shaft to generate an airflow. The booster is disposed inside the housing and surrounds an outer periphery of the mixed-flow fan, wherein, the booster comprises a booster surface facing the mixed-flow fan; a radial size of at least part of the booster surface gradually increases in a direction from the rear side to the front side; a gap is formed between the booster and the housing.