Centrifugal Blower Outlet Expansion and Dividing Plate Flow Balance
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Solution Overview
Problem
Centrifugal blowers suffer from noise and reduced air volume due to flow imbalance at the outlet of the scroll casing, primarily caused by air friction and expansion effects.
Innovation Solution
A centrifugal blower design featuring a scroll casing with an expansion part and a dividing plate outside the air outlet, which divides the flow path into two paths, coupled with an exhaust grill and a diffuser to stabilize air flow and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the outlet of the scroll casing is expanded to increase opening area for air diffusion, then air diffusion is improved, but flow imbalance is significantly generated
Solution Approach 1:
The expansion part is divided into multiple sections with different expansion ratios. The first expansion part has a first expansion ratio while the second expansion part has a second expansion ratio different from the first, creating segmented expansion zones that balance flow distribution across the expanded outlet area
Solution Approach 2:
Different portions of the expansion path receive different treatment through varying expansion ratios. The first and second expansion parts provide localized expansion characteristics tailored to specific flow requirements, ensuring uniform flow distribution across the entire expanded outlet while maintaining overall flow balance
2Productivity
If air friction is reduced to increase air volume, then exhaust flow is improved, but noise control becomes challenging
Solution Approach 1:
The expansion ratios are designed to vary dynamically along the expansion path, with the first expansion ratio in the initial section and the second expansion ratio in the subsequent section. This dynamic variation optimizes flow acceleration to reduce air friction and increase air volume while controlling noise generation through gradual expansion
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 stabilizes the air flow, reduces noise, and increases air volume by addressing the flow imbalance and air friction issues.
Implementation Method 1
the end of the outlet of the scroll casing is expanded, allowing for an increase in an opening area thereof, in order to diffuse air, and due to an expansion effect, the imbalance of exhaust flow is significantly generated
Implementation Method 2
The dividing plate may divide the flow path inside the expansion part into two flow paths
Implementation Method 3
centrifugal blowers allow the flow of air to occur, such that intake flow is generated in a direction of an axis of rotation thereof and exhaust flow is generated in a direction perpendicular to the axis of rotation
Data Source
AI summary
A disclosed centrifugal blower comprises: a centrifugal fan; a scroll casing which is configured so as to surround the centrifugal fan, has an air inlet on at least one surface thereof, has an air outlet on one side thereof, and guides, to the air outlet, air discharged from the centrifugal fan; an expansion part which is provided at the air outlet and is configured such that the cross-sectional area of the flow path is expanded in the air discharge direction; and a dividing plate which is provided in the expansion part, is arranged at the outside of the air outlet and is arranged lengthwise along the flow direction of the air discharged from the air outlet.