Low-Noise Blower Impeller Blade Radius Optimization
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Solution Overview
Problem
Conventional respirators with blowers are loud, disrupting patient rest and caregiver fatigue, and obstructing diagnosis due to noise levels exceeding 65 dB, which is not suitable for the varying air flow and pressure needs of patients, especially neonatal patients.
Innovation Solution
A centrifugal blower design featuring an impeller with a specific blade geometry and edge radii configuration that reduces turbulence and noise, including a first radius range of 0.03-0.20 inch and a second radius range of 0.14-0.16 inch, along with a sound-damping material applied to the housing to minimize acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional blowers are used in respirators, then the required air flow and pressure can be provided, but the noise level exceeds 65 dB which disrupts patient rest and masks breathing noises
Solution Approach 1:
The patent applies parameter changes by optimizing the blade geometry parameters including the leading surface radius (0.03-0.20 inch) and the outside edge radius (0.14-0.16 inch). These specific parameter modifications to the impeller blade design reduce turbulence and noise generation while maintaining the blower's ability to deliver accurate air flow and pressure across wide ranges, thus resolving the contradiction between noise reduction and performance maintenance.
2Object-affected harmful factors
If conventional blower designs are used, then sufficient air flow is provided, but turbulence and noise are generated that obstruct diagnosis and monitoring
Solution Approach 1:
The patent modifies geometric parameters of the impeller blades, specifically the leading surface radius (0.03-0.20 inch) and outside edge radius (0.14-0.16 inch), to reduce turbulence generation. This parameter optimization minimizes noise and airflow disturbances, thereby improving the reliability of patient diagnosis and monitoring by allowing clear detection of natural breathing noises without obstruction from blower-generated turbulence or noise.
3Object-affected harmful factors
If standard impeller blade geometry is used, then the blower can operate, but noise levels are high due to turbulence at the blade tips
Solution Approach 1:
The patent implements parameter changes by specifying precise radius ranges for the blade geometry: leading surface radius of 0.03-0.20 inch and outside edge radius of 0.14-0.16 inch. These controlled parameter modifications reduce turbulence at blade tips and consequently lower noise levels, while the added geometric complexity remains within acceptable manufacturing limits, thus resolving the contradiction between noise reduction and device complexity.
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 blower provides a quiet and accurate flow of compressed gas over a wide range of flow rates and pressures, reducing noise levels and improving patient care by minimizing disruptions and enhancing monitoring capabilities.
Implementation Method 1
a sound-damping material applied to the housing to minimize acoustic noise
Implementation Method 2
an impeller with a specific blade geometry and edge radii configuration that reduces turbulence and noise
Data Source
AI summary
A low-noise blower has an impeller with an impeller plate and a plurality of blades each attached to the impeller plate. Each blade has a tip and a leading surface with a first portion that is proximate to the tip and has a first radius that is within a range of 0.03-0.20 inch.