Blower Diffuser Angle Variation to Reduce Noise and Power Consumption
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Solution Overview
Problem
Conventional blowers in air conditioners face inefficiencies in blowing performance due to non-uniform air current distribution, leading to increased power consumption and noise, especially when multiple blowers are adjacent, causing air currents to collide and interfere, which worsens efficiency and noise levels.
Innovation Solution
A blower design featuring a bell mouth part and a diffuser part with an inclined surface that increases the cross-sectional area towards the downstream end, varying diffuser angles along the circumferential direction, and noise prevention blades to minimize turbulence and enhance pressure restoration, reducing noise and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of revolutions of a propeller fan is increased to increase the suction flow rate, then the suction flow rate is improved, but power consumption is increased and noise is generated
Solution Approach 1:
The diffuser part is designed with different diffuser angles in different regions to match the non-uniform air current distribution. The diffuser angle is smaller in regions with higher air flow rates and larger in regions with lower air flow rates, optimizing local flow characteristics without increasing fan speed or power consumption.
Solution Approach 2:
The patent changes the geometric parameters of the diffuser part, specifically the diffuser angle, to optimize air flow efficiency. By adjusting the diffuser angle parameter, the system achieves better blowing efficiency without increasing the suction flow rate through higher fan speeds, thus avoiding increased power consumption.
2Productivity
If the number of revolutions of a propeller fan is increased to increase the suction flow rate, then the suction flow rate is improved, but noise is generated
Solution Approach 1:
The diffuser part employs region-specific diffuser angles that correspond to the local air current distribution characteristics. This localized optimization reduces turbulence and vortex formation in high-flow regions while maintaining stable flow in low-flow regions, thereby reducing noise without sacrificing suction flow rate.
Solution Approach 2:
The patent converts the non-uniform air current distribution, which is typically a harmful factor causing inefficiency, into a beneficial design parameter. By matching the diffuser angle distribution to the non-uniform flow pattern, the system transforms the irregular flow into an optimized flow structure that reduces noise and improves efficiency.
3Productivity
If multiple blowers are adjacently disposed to correspond to heat exchangers arranged in parallel rows, then heat exchanger efficiency is improved, but air currents collide and interfere causing efficiency deterioration and noise increase
Solution Approach 1:
Each blower's diffuser part is designed with specific diffuser angle characteristics that account for its position relative to adjacent blowers. This localized design ensures that air currents from adjacent blowers do not collide adversely, maintaining efficiency and reducing noise while preserving the parallel heat exchanger arrangement.
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 significantly enhances blowing efficiency and reduces noise by optimizing air flow and pressure restoration, while minimizing interference between adjacent blowers and noise generation from noise prevention blades.
Implementation Method 1
the diffuser part is provided to be inclined so that an area of a flow path increases toward a downstream end of the diffuser part
Implementation Method 2
a diffuser part installed on the downstream side of the bell mouth part, and having a flow path area which is enlarged from the upstream side toward the downstream side
Data Source
AI summary
Provided are a blower, capable of suppressing noise occurring in a stator while significantly improving blowing efficiency, and an outdoor unit using the same. The present disclosure comprises: a bell mouth part spaced apart at a predetermined distance in the radial direction with respect to an outer circumferential end of a propeller fan; and a diffuser part installed on the downstream side of the bell mouth part, and having a flow path area which is enlarged from the upstream side toward the downstream side with a larger magnification rate than the magnification rate of the flow path area in the downstream end of the bell mouth part; and a stator part having a plurality of stators, wherein the stator part is arranged within the diffuser part.