High-Speed Fan Diffuser Structure for Low-Loss Airflow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed fans face challenges with efficiency due to high fluid and mechanical losses, leading to excessive temperature rise and limited design flexibility for varying power and speed requirements, with existing designs struggling to maintain efficiency across a broad power range.
Innovation Solution
The fan design incorporates a diffuser with a first protrusion, inner ring arm, and outer ring arm, creating a wind tunnel with variable and equal cross-sections to reduce impact and separation losses, and a stator assembly for improved heat dissipation, along with a bearing assembly for high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan operates at high speed and high power to improve air supply effect, then the suction power and air supply efficiency are enhanced, but fluid and mechanical losses increase causing excessive temperature rise
Solution Approach 1:
The wind tunnel is divided into multiple sections with different cross-sectional areas, including a small cross-section section and a large cross-section section. This segmentation allows optimized airflow control in different regions, reducing fluid losses while maintaining high-speed operation efficiency.
Solution Approach 2:
Different sections of the wind tunnel have different structural characteristics - the small cross-section section provides high velocity airflow while the large cross-section section reduces turbulence and losses. This local quality variation optimizes the balance between suction power and energy efficiency at different locations.
2Power
If the fan is designed for high power operation to meet consumer demand for greater suction power, then the air supply effect is improved, but the temperature rise becomes too high requiring complex heat dissipation design
Solution Approach 1:
The patent introduces a vertical dimension to heat dissipation by designing the wind tunnel to extend in the axial direction with multiple cross-sectional sections. This three-dimensional structure creates natural airflow paths that carry heat away from the motor area, reducing temperature rise without requiring additional complex heat dissipation components.
3Adaptability or versatility
If the fan operates across a wide speed range to provide design flexibility, then adaptability to different power requirements is improved, but the efficiency becomes highly sensitive to design input
Solution Approach 1:
The wind tunnel structure with variable cross-sections serves multiple functions: it guides airflow efficiently at high speeds, stabilizes flow at lower speeds, and maintains consistent performance across different operating conditions. This universal design reduces efficiency sensitivity to specific operating parameters while maintaining adaptability.
4Ease of manufacture
If the fan uses a simple structure to reduce manufacturing complexity, then ease of manufacture is improved, but the efficiency under high-speed conditions is limited
Solution Approach 1:
The wind tunnel incorporates curved surfaces and smooth transitions between sections, which are more efficient for high-speed airflow than sharp angles or flat surfaces. These curved geometries reduce turbulence and energy losses while remaining manufacturable using standard forming processes.
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 design enhances airflow efficiency, reduces losses, and allows for stable operation across a wide speed range (100,000 rpm to 150,000 rpm) with improved heat dissipation and structural integrity, achieving efficiency above 52.5% across different power levels.
Implementation Method 1
the diffuser including a first protrusion connected to the drive structure, the first protrusion protruding in a direction of the wind hood, and a diameter of one end of the first protrusion close to the cover plate being smaller than a diameter of one end away from the cover plate
Implementation Method 2
the outer ring arm being smoothly and transitionally connected to the wind hood, and the first protrusion, the inner ring arm, and the outer ring arm being coaxially arranged
Implementation Method 3
a stator assembly for improved heat dissipation
Implementation Method 4
a bearing assembly for high-speed operation
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The present invention provides a fan and an electric appliance, the fan comprising: a drive structure; an impeller, including a cover plate, the cover plate being installed on the drive structure, the cover plate being recessed in an axial direction of the impeller, and a diameter of the cover plate gradually increasing along an air inlet direction; a wind hood, being covered on the impeller, and an air inlet and an air outlet communicated to the air inlet being provided on the wind hood; and a diffuser, being located at one end of the impeller facing the air outlet, and the diffuser including a first protrusion connected to the drive structure, the first protrusion protruding in a direction of the wind hood, and a diameter of one end of the first protrusion close to the cover plate being smaller than a diameter of one end away from the cover plate, the diffuser also including an inner ring arm connected to the first protrusion and an outer ring arm sleeved outside the inner ring arm, and the outer ring arm being smoothly and transitionally connected to the wind hood, and the first protrusion, the inner ring arm, and the outer ring arm being coaxially arranged, wherein, the wind hood, the cover plate, and the diffuser defines a wind tunnel, the wind tunnel includes a portion with variable cross-section and a portion with equal cross-section, the portion with variable cross-section is arranged close to the air inlet, and the portion with equal cross-section is arranged close to the air outlet. In the fan provided by the present invention, the air flow in the entire wind tunnel is very smooth, which improves the efficiency of the fan.