Cross-Flow Fan Blade Protrusions for Vortex and Noise Reduction
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Solution Overview
Problem
Cross flow fans in air conditioners generate vortices during air discharge, leading to noise, vibration, and reduced suction and discharge efficiency due to the vortex, which affects the overall performance of the air conditioner.
Innovation Solution
The design incorporates blades with protrusions and projections that reduce vortex occurrence by guiding air flow smoothly, with protrusions extending from the outer edge of the blades toward the bottom surface and projections on the outer edge to prevent air resistance and enhance flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional blades are used in the cross flow fan, then the structure is simple, but vortices are generated during air discharge causing noise, vibration, and reduced efficiency
Solution Approach 1:
The blade design incorporates protrusions at the leading edge and projections at the trailing edge, creating localized structural variations that specifically address vortex formation at critical locations while maintaining overall blade functionality for air discharge
Solution Approach 2:
The protrusions and projections create curved flow paths that guide air smoothly through the blade, replacing straight edges with aerodynamic contours that reduce turbulence and vortex generation during air discharge
2Productivity
If blades without protrusions and projections are used, then manufacturing is simpler, but air resistance increases and flow efficiency decreases
Solution Approach 1:
Rather than complicating the entire blade structure, the invention applies localized protrusions and projections only at specific locations (leading and trailing edges) that have the greatest impact on flow efficiency, minimizing structural complexity while maximizing performance
Solution Approach 2:
The invention optimizes parameters such as the size, shape, and positioning of protrusions and projections to achieve the best balance between reducing air resistance and maintaining manufacturing simplicity, allowing for efficient airflow with minimal structural modification
3Productivity
If the cross flow fan operates at higher power to overcome vortex resistance, then air discharge efficiency may improve, but power consumption increases
Solution Approach 1:
The protrusions and projections convert what would be harmful vortex formations into controlled, smooth airflow patterns, transforming potential energy losses into beneficial flow guidance that reduces the power needed for air discharge
Solution Approach 2:
By optimizing blade geometry parameters including protrusion height, projection length, and angular orientations, the invention reduces the energy required to move air through the system, achieving high discharge efficiency at lower power consumption levels
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 solution effectively increases air discharge efficiency, reduces noise, and improves static pressure performance, allowing for higher flow amounts and lower power consumption, enhancing user satisfaction and the overall performance of the air conditioner.
Implementation Method 1
Cross flow fans in air conditioners generate vortices during air discharge, leading to noise, vibration, and reduced suction and discharge efficiency due to the vortex
Implementation Method 2
The design incorporates blades with protrusions and projections that reduce vortex occurrence by guiding air flow smoothly
Data Source
AI summary
A cross flow fan and an air conditioner having the same are provided. The cross flow fan may include a fixing member having a plate shape, and a plurality of blades fixed to one surface of the fixing member. The plurality of blades may be arranged spaced apart from each other in a circumferential direction. An inner edge may define an end of a side of each of the plurality of blades, the inner edge extending toward a rotational shaft of the plurality of blades, and an outer edge may define an end opposite to the inner edge. A protrusion may protrude from the outer edge in one direction.