Centrifugal Fan Inlet Structure with Varying Chamfer Angles
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Solution Overview
Problem
Conventional centrifugal fans have limited heat dissipation efficiency due to the shape of their inlet structures, which restricts airflow and flow field smoothness.
Innovation Solution
A centrifugal fan frame with a housing and inlet structure featuring a top portion with multiple first chamfering angles and an edge portion with varying second chamfering angles and slopes, designed to guide airflow more smoothly into the fan, enhancing airflow quantity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inlet structure is reshaped with multiple first chamfering angles to increase heat dissipation efficiency, then the heat dissipation efficiency is improved, but the improvement is limited
Solution Approach 1:
The inlet structure is divided into multiple functional portions: a top portion with multiple first chamfering angles and an edge portion with multiple second chamfering angles. This segmentation allows each portion to independently optimize airflow patterns, transforming the single-shaped inlet into a multi-functional structure that significantly enhances heat dissipation efficiency beyond conventional designs.
Solution Approach 2:
Different regions of the inlet structure are given different geometric characteristics tailored to their specific functions. The top portion uses multiple first chamfering angles to optimize air intake distribution, while the edge portion uses multiple second chamfering angles to smooth airflow into the fan assembly. This local optimization of geometric quality at different positions achieves superior overall performance.
2Ease of manufacture
If the inlet structure is simplified to ease manufacturing, then manufacturing is easier, but airflow enhancement and flow field smoothing are limited
Solution Approach 1:
The invention optimizes airflow performance by carefully controlling geometric parameters including the angles of multiple chamfering surfaces and the lengths of edge portions. These parameter variations create complex airflow patterns that enhance heat dissipation while maintaining manufacturability through standard machining operations capable of producing multiple chamfering angles.
3Reliability
If the edge portion length is increased to prevent air leakage, then air leakage is reduced, but the overall structure becomes more complex
Solution Approach 1:
The edge portion is designed with asymmetric characteristics where different segments have different lengths and different second chamfering angles. This asymmetric configuration allows the structure to adapt to varying airflow conditions and prevent air leakage at specific locations without requiring uniform extension throughout the entire edge, thus maintaining structural efficiency.
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 redesigned inlet structure increases air quantity and fan efficiency by smoothing the airflow, with adjustable edge portion lengths to prevent air leakage, resulting in improved air pressure and flow field smoothness.
Implementation Method 1
When the fan assembly 1 is operated, a flow field is formed within the accommodating space S, and the outside air will enter into the flow field through the inlet structure 21
Implementation Method 2
The top portion is disposed around the opening and includes a plurality of first chamfering angles, at least one of the chamfering angles is different from the others. The edge portion extends from the top portion to the inside of the housing through the opening and includes a plurality of second chamfering angles
Data Source
AI summary
A fan frame of a centrifugal fan comprises a housing and an inlet structure. The housing includes an opening. The inlet structure is disposed at the opening and includes a top portion and an edge portion. The top portion is disposed around the opening and includes a plurality of first chamfering angles, at least one of the chamfering angles is different from the others. The edge portion extends from the top portion to the inside of the housing through the opening and includes a plurality of second chamfering angles. A centrifugal fan including the fan frame is also disclosed.