Blower Housing Air Outlet Geometry for Low-Resistance Airflow
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Solution Overview
Problem
Conventional air blowers face inefficiency and large size due to high air resistance, requiring increased input power to achieve sufficient airflow, especially in compact applications like hand dryers.
Innovation Solution
The air blower design features outwardly inclined air outlets with specific angle and height ratios, reducing air resistance and allowing for increased airflow at lower power input, while minimizing the blower's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the input power of the blower is increased to increase the airflow, then the airflow is improved, but the overall efficiency becomes low and the size becomes large
Solution Approach 1:
The patent changes the geometric parameters of the air outlets by introducing specific angle ranges (α: 0-45 degrees, β: 15-45 degrees) and height ratios (H1/H2: 20/77.3 to 46/77.3). These parameter optimizations reduce air resistance and improve airflow efficiency without increasing input power, thereby resolving the contradiction between airflow and energy efficiency
2Productivity
If the input power of the blower is increased to increase the airflow, then the airflow is improved, but the size of the blower becomes large
Solution Approach 1:
By optimizing the air outlet geometry parameters (angles α and β, and height ratio H1/H2), the patent achieves better airflow performance from a compact blower structure. This allows the blower to maintain a small size while delivering improved airflow through enhanced aerodynamic design rather than size scaling
3Ease of manufacture
If conventional air outlets are used, then the structure is simple, but the air resistance is large which reduces airflow
Solution Approach 1:
The patent modifies the air outlet parameters within practical manufacturing ranges (angles 0-45 degrees and 15-45 degrees, height ratio 20/77.3 to 46/77.3). These parameter changes can be implemented through standard manufacturing processes while significantly reducing air resistance and improving airflow performance
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 enhances blower efficiency, reduces power consumption, and extends the blower's lifespan by optimizing airflow and pressure delivery in a more compact form.
Implementation Method 1
By deliberately configuring the shape of the air outlets of the blower housing to increase the size of the air outlets, the air resistance during operation of the blower is reduced, thereby increasing the airflow through the blower at a lower input power
Data Source
AI summary
An air blower includes an impeller, a motor and a blower housing. The blower housing includes a first housing member for receiving the motor and a second housing member for receiving the impeller. The first and second housing members are mounted to each other. Two opposed air outlets are formed at an end of the first housing member remote from the second housing member. Each air outlet is formed by an outwardly inclined cutout. The cutout is bounded by two inclined sides. An angle A formed by each inclined side and an axial direction of the blower is in the range from 0 to 45 degrees. Radial lines extending from one inclined side of one air outlet and the adjacent inclined side of the other air outlet form an angle B in the range from 15 to 45 degrees.