Fan and air conditioner
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Solution Overview
Problem
Existing sirocco fans experience airflow separation and noise disturbances due to vortex flow generation at the leading edge of the blades, which reduces the quietness and strength of the fan against centrifugal force.
Innovation Solution
The fan blades incorporate a porous portion at the separation point, specifically at the leading edge, which reduces airflow separation and noise, while maintaining strength through non-porous joint portions at high-stress areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the entire blade is made of porous material, then airflow separation and noise are reduced, but the strength and structural integrity deteriorate
Solution Approach 1:
The blade is designed with different material properties in different regions: the leading edge portion is made of porous material to reduce airflow separation and noise, while the joint portions are made of non-porous material to ensure structural strength. This local differentiation allows each part to perform its specific function optimally without compromising overall blade integrity.
Solution Approach 2:
The blade is constructed as a composite structure combining porous material and non-porous material within a single component. The porous portion is integrated with the non-porous joint portions to form a unified blade that leverages the flow-control benefits of porous material while maintaining the structural advantages of solid material at critical locations.
2Object-generated harmful factors
If porous material is used throughout the blade, then quietness is improved, but resistance to centrifugal force deteriorates
Solution Approach 1:
The blade is designed with different material properties in different regions: the leading edge portion is made of porous material to reduce airflow separation and noise, while the joint portions are made of non-porous material to ensure structural strength. This local differentiation allows each part to perform its specific function optimally without compromising overall blade integrity.
Solution Approach 2:
The blade is constructed as a composite structure combining porous material and non-porous material within a single component. The porous portion is integrated with the non-porous joint portions to form a unified blade that leverages the flow-control benefits of porous material while maintaining the structural advantages of solid material at critical locations.
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 improves the quietness and strength of the fan by minimizing airflow separation and noise, enhancing performance without compromising structural integrity.
Implementation Method 1
part of the blade being a porous portion
Implementation Method 2
the fan blades incorporate a porous portion at the separation point, specifically at the leading edge, which reduces airflow separation and noise
Data Source
AI summary
A fan includes a plate a plate having a discoidal shape, an annular ring portion having an annular ring shape, and a blade located between the plate and the annular ring portion. The plate is configured to rotate about an axis. The annular ring portion is located apart from the plate in an axial direction of the axis. The blade has one end in the axial direction of the axis joined to the plate, and an other end in the axial direction joined to the annular ring portion. Part of the blade is a porous portion. A joint portion between the blade and the plate or a joint portion between the blade and the annular ring portion is a non-porous portion.