Centrifugal Fan Drawing Surface Air Speed Distribution
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Solution Overview
Problem
Centrifugal fans used in electric apparatuses face challenges in efficiently cooling components due to uneven air speed distribution across their drawing surfaces, leading to reduced cooling efficiency and increased noise, especially when components are located near the fan's drawing surface, and the arrangement of airflow control members is hindered by space limitations.
Innovation Solution
The electric apparatus employs a centrifugal fan with a drawing surface featuring distinct areas of different air speeds, where the higher-speed area is positioned closer to components requiring greater cooling capacity, allowing for efficient air distribution without the need for additional airflow control members, thus maintaining cooling efficiency and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cooled part is located near the drawing surface of the centrifugal fan to reduce apparatus size, then the apparatus becomes more compact, but the cooling efficiency lowers due to uneven air speed distribution
Solution Approach 1:
The drawing surface is divided into multiple regions with different air speeds (first region with lower air speed, second region with higher air speed). This local differentiation allows the cooled part to be positioned close to the fan while still receiving adequate cooling air, resolving the contradiction between compact size and cooling efficiency.
2Productivity
If the number of fan rotations is increased to improve cooling efficiency, then the cooling performance improves, but the noise increases accordingly
Solution Approach 1:
By creating different air speed regions on the drawing surface, the system achieves effective cooling at lower fan rotation speeds. The higher air speed region provides sufficient cooling air volume without requiring excessive fan rotation, thereby maintaining low noise levels while preserving cooling efficiency.
3Productivity
If airflow control members are added near the drawing surface to improve cooling wind distribution, then the cooling efficiency improves, but the device complexity increases and space is consumed
Solution Approach 1:
The invention extracts the air speed differentiation function from separate airflow control members and integrates it directly into the drawing surface structure. This eliminates the need for additional control components while achieving the same cooling efficiency improvement, thereby reducing device complexity.
4Productivity
If a large cooling assistance member such as heat sink is arranged near the drawing surface to increase cooling efficiency, then the cooling performance improves, but the available space is reduced and noise increases
Solution Approach 1:
Instead of adding large cooling assistance members, the invention creates local high-air-speed regions on the drawing surface that provide concentrated cooling air flow. This approach achieves high cooling efficiency without requiring additional space-consuming components, thereby maintaining compact apparatus size.
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 ensures proper air distribution among components, enhances cooling efficiency, reduces noise, and allows for a more compact design by eliminating the need for additional airflow control members and dedicated cooling fans, while maintaining fan efficiency.
Implementation Method 1
a centrifugal fan that includes an impeller in a casing, and is configured to draw air when the impeller rotates in the casing
Data Source
AI summary
An electric apparatus includes a centrifugal fan that includes an impeller in a casing, and is configured to draw air when the impeller rotates in the casing, and to have a blowoff channel of the air from the impeller in the casing, which spreads in a rotating direction of the impeller, and a first cooled part and a second cooled part that has a necessary cooling air capacity larger than that of the first cooled part, the first cooled part and the second cooled part being cooled by the air drawn by the centrifugal fan, wherein a drawing surface of the centrifugal fan has a first drawing area and a second drawing area that has a drawing speed higher than that of the first drawing area when the impeller rotates.