Axial Flow Wind Wheel with Concentric Flow Guide Ribs
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Solution Overview
Problem
The axial flow wind wheel in air conditioner outdoor units experiences air flow separation on blade surfaces, leading to reduced air outflow volume and increased operation noise.
Innovation Solution
The axial flow wind wheel incorporates uniformly arranged blades with flow guide structures on their suction surfaces, comprising flow guide ribs arranged along concentric arcs. These structures disperse separated air flows, re-attaching them uniformly to reduce noise and increase air supply volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional smooth blade surfaces are used, then manufacturing is simple, but air flow separation occurs leading to reduced air outflow volume and increased noise
Solution Approach 1:
The patent applies local quality by adding flow guide structures (ribs or grooves) only to specific regions of the blade suction surface, particularly in the middle and rear sections where flow separation occurs. This localized modification improves airflow control and increases air outflow volume without requiring complete redesign of the entire blade structure, thus balancing performance improvement with manufacturing complexity.
Solution Approach 2:
The flow guide structures are segmented into multiple ribs or grooves arranged in specific patterns (e.g., radial, circumferential, or inclined orientations) across different regions of the blade surface. This segmentation allows each structure to address specific airflow separation zones independently, optimizing overall airflow control while maintaining manageable structural complexity.
2Object-affected harmful factors
If conventional smooth blade surfaces are used, then manufacturing is simple, but operation noise increases due to air flow separation
Solution Approach 1:
Flow guide structures are strategically positioned on the suction surface of the blades, particularly in regions prone to flow separation. These localized structures control airflow attachment, reducing turbulence and noise generation without requiring complex modifications across the entire blade structure.
Solution Approach 2:
The patent converts the harmful effect of flow separation into a beneficial controlled flow pattern. By introducing flow guide structures that create intentional flow control features, the design transforms uncontrolled flow separation (which causes noise) into controlled airflow patterns that reduce turbulence and operational noise.
3Productivity
If flow guide structures are added to blade suction surfaces, then air flow separation is reduced and air outflow volume increases, but manufacturing complexity increases
Solution Approach 1:
The flow guide structures are implemented as localized ribs or grooves on the blade suction surface rather than requiring complete blade redesign. This localized approach can be manufactured using conventional molding or machining techniques, minimizing the impact on manufacturing ease while achieving improved airflow control and increased air outflow volume.
Solution Approach 2:
The flow guide structures are segmented into discrete ribs or grooves that can be manufactured independently or as integrated features during blade production. This segmentation allows for flexible manufacturing approaches, including additive manufacturing or post-processing additions, thereby maintaining reasonable manufacturing ease while achieving performance improvements.
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 implementation of flow guide structures effectively disperses and re-attaches air flows, reducing noise and enhancing the air supply volume of the axial flow wind wheel.
Implementation Method 1
there is a phenomenon of air flow separation on surfaces of the blades, which leads to decrease of air outflow volume of the axial flow wind wheel and increase of operation noise
Data Source
AI summary
The present application discloses an axial flow wind wheel, including a wheel hub and blades; inner edges of the plurality of blades are connected to the wheel hub, and the blades are uniformly arranged at interval in a circumferential direction of the wheel hub; a suction surface of each blade is provided with rows of flow guide structures, and each row of flow guide structure includes flow guide ribs arranged along an arc corresponding thereto; and the arcs respectively corresponding to the rows of flow guide structures are concentric with an axis of the wheel hub, and are arranged at interval in a radial directional of the wheel hub. An air conditioner outdoor unit includes a heat exchanger, a driving motor, and the axial flow wind wheel.