Multiblade Fan Impeller Side Plate Flow Alignment
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Solution Overview
Problem
Conventional multiblade fans experience turbulence and noise due to misaligned gas flow vectors, leading to deteriorated blowing performance, primarily caused by swirling and reverse-direction flows.
Innovation Solution
The impeller design incorporates an annular side plate with axially and radially extending portions to align the swirling flow with the suction main flow, controlling reverse-direction flows and promoting efficient gas circulation, thereby reducing noise and enhancing blowing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the conventional impeller design with simple annular side plate is used, then the structure is simple and easy to manufacture, but turbulence and noise occur due to misaligned gas flow vectors, leading to deteriorated blowing performance
Solution Approach 1:
The side plate is segmented into multiple functional portions: an axially extending portion to guide swirling flow, a radially extending portion to control reverse-direction flow, and a main body portion. This segmentation allows each portion to address specific flow control needs, improving blowing performance while maintaining manufacturing feasibility through modular design
Solution Approach 2:
The side plate extends in multiple dimensions (axially and radially) rather than being a simple planar annular structure. This multi-dimensional configuration enables the side plate to control gas flow vectors in different directions, aligning swirling flow with suction main flow and preventing reverse-direction flow, thereby improving blowing performance
2Device complexity
If the conventional impeller design is used, then the device complexity is low, but noise increases due to turbulence from misaligned flow vectors
Solution Approach 1:
The side plate is divided into functionally distinct portions (axially extending, radially extending, and main body portions) that work together to control different aspects of gas flow. This segmentation enables effective turbulence control and noise reduction through targeted flow management without requiring overly complex impeller structures
Solution Approach 2:
The side plate acts as an intermediary structure between the blades and the casing, mediating gas flow by guiding swirling flow along the axial direction and controlling reverse-direction flow. This intermediary function reduces turbulence and noise while maintaining a relatively simple impeller structure
3Ease of manufacture
If the conventional impeller design with simple side plate is used, then manufacturing is easier, but blowing performance deteriorates due to reverse-direction flow
Solution Approach 1:
The side plate is segmented with a specific radially extending portion that acts as a barrier to reverse-direction flow. This portion extends from the outer peripheral edge toward the inner peripheral side, physically blocking reverse flow while maintaining manufacturing simplicity through conventional forming processes
Solution Approach 2:
Different portions of the side plate have different local qualities and functions: the axially extending portion guides swirling flow, the radially extending portion blocks reverse-direction flow, and the main body portion provides structural support. This local differentiation optimizes blowing performance while keeping the overall structure manufacturable
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 effectively reduces turbulence and noise while improving the multiblade fan's blowing performance by aligning gas flow vectors and controlling reverse-direction flows, resulting in a more efficient airflow.
Implementation Method 1
an impeller (113) comprising a main plate (131) that rotates about a rotational axis (O-O)
Implementation Method 2
the blades (133) of the impeller (113) boost the pressure of and blow out gas from the space on the inner peripheral side to the space on the outer peripheral side
Data Source
AI summary
An impeller of a multiblade fan includes a discoid main plate that rotates about a rotational axis, blades, and a side plate. The blades are disposed annularly about the rotational axis on one side of the main plate, with one end of each of the blades being fixed to an outer peripheral portion of the main plate. The side plate includes an annular side plate body portion that joins outer peripheral edges of the other ends of the blades to each other, an axially extending portion that extends from an opposite-main plate side end of the side plate body portion in the rotational axis direction further than the opposite-main plate side ends of the blades, and a radially extending portion that extends from an outer peripheral end of the side plate body portion further than a radial-direction outer peripheral end of the axially extending portion.