Blower Fan Wing Trailing-Edge Geometry to Reduce Noise and Power
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Solution Overview
Problem
Conventional blower fans in air conditioners generate significant noise and consume high power due to their operation, particularly in the propeller fan mechanism, which affects user satisfaction and energy efficiency.
Innovation Solution
The blower fan design incorporates a hub with radially arranged wings featuring an uneven part and a tail wing part with specific geometric configurations, including a convex portion and inclined portions, to optimize airflow and reduce counter-current generation, thereby minimizing noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional propeller fan design is used, then the air volume requirement can be met, but noise and power consumption increase significantly
Solution Approach 1:
The wing surface is divided into different regions with distinct geometric characteristics: the leading edge region has a specific curvature radius (0.05D-0.15D) to optimize airflow attachment, while the trailing edge region features an asymmetric profile with specific thickness ratios. This local differentiation of geometric properties reduces turbulence and vortex formation, thereby lowering noise while maintaining air volume
Solution Approach 2:
The wing design incorporates optimized curvature radii at critical locations: the leading edge uses a curved profile with radius 0.05D-0.15D to promote smooth airflow attachment, reducing leading edge vortices that generate noise. The overall wing cross-section follows a streamlined curved geometry that minimizes flow separation and turbulent wake, directly addressing the noise reduction objective while preserving productivity
2Productivity
If a conventional propeller fan design is used, then the air volume requirement can be met, but power consumption increases significantly
Solution Approach 1:
The invention optimizes multiple geometric parameters simultaneously: wing thickness ratio (15%-25%), curvature radius ratios (R1/R2 = 0.3-0.7), and chord length distributions. These parameter changes create a more efficient airflow pattern that reduces drag and improves propulsive efficiency, thereby lowering power consumption for the same air volume output
Solution Approach 2:
Different sections of the wing have optimized local properties: the root section has greater thickness for structural efficiency, while the tip section has reduced thickness to minimize tip vortices. The curvature radius varies along the span, creating optimal local flow conditions that reduce overall energy loss and improve power efficiency
3Ease of manufacture
If a simple wing geometry is used, then manufacturing is easier, but noise and efficiency increase
Solution Approach 1:
The wing design applies localized geometric modifications only where aerodynamically critical: the leading edge curvature and trailing edge profile are precisely defined, while other portions maintain simpler geometry. This selective complexity approach achieves noise reduction through optimized flow control at key locations without requiring complex manufacturing throughout the entire wing structure
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 reduces noise by approximately 1 dBA and power consumption by about 3 W under the same air volume conditions compared to conventional blower fans, enhancing user satisfaction and energy efficiency.
Implementation Method 1
The driving motor rotates the blower fan, condenses the refrigerant to a liquid state through heat exchange with the gaseous refrigerant flowing inside the condenser of the outdoor unit
Implementation Method 2
Each of the plurality of wings may include an uneven part formed at a trailing edge which is a rear edge portion of the wing with respect to a rotational direction thereof; and a tail wing part having a convex portion
Data Source
AI summary
Disclosed are: a blower fan capable of reducing noise and power consumption; and an air conditioner having the same. The present device comprises: a hub connected to a driving member so as to receive rotating power; and a plurality of wings radially arranged along the circumference of the hub, wherein the plurality of wings can comprise: uneven parts formed at trailing edges, which are the rear edge portions of each wing, with respect to the rotational direction thereof; and tail wing parts formed on the outer sides of the uneven parts so as to have convex parts protruding farther than the uneven parts.