Side Channel Compressor Blade Chamber Geometry for Low Noise
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Solution Overview
Problem
Side channel compressors are less effective than radial compressors due to high noise emissions caused by unsteady turbulent flow and structural inefficiencies, which are exacerbated by the blade noise resulting from pressure fluctuations at the interrupter inlet and outlet, and they fail to produce defined, constant volumetric flows required for ventilation therapy devices.
Innovation Solution
The side channel compressor features blade chambers with constant width in the circumferential direction, fabricated using a ball nose cutter for smooth surfaces, and a reduced impeller diameter, along with smooth, antibacterial gas-conducting parts and an expansion section at the interrupter to enhance flow efficiency and reduce noise, incorporating sound absorbers and materials with low density and high strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional side channel compressor design is used, then compression function is achieved, but noise emissions are extremely high due to turbulent flow and blade noise
Solution Approach 1:
The patent applies local quality by optimizing specific regions of the side channel geometry. The cross-sectional shape is modified locally along the flow path, with the channel depth and width varying in specific sections to reduce turbulence and noise while maintaining compression performance. This localized optimization allows noise reduction without sacrificing overall compression effectiveness.
Solution Approach 2:
The patent changes geometric parameters of the side channel, including cross-sectional shape, channel depth, and width distribution along the flow path. These parameter modifications are designed to smooth flow transitions, reduce turbulence intensity, and minimize noise-generating flow separation, thereby resolving the contradiction between noise reduction and compression effectiveness.
2Productivity
If conventional side channel compressor design is used, then compression function is achieved, but defined constant volumetric flows required for ventilation therapy are not produced
Solution Approach 1:
The patent introduces local quality modifications in the side channel geometry, particularly in the expansion section where the cross-sectional area increases gradually. This localized geometric optimization stabilizes the flow profile and reduces turbulence, enabling the compressor to deliver defined constant volumetric flows suitable for ventilation therapy applications.
Solution Approach 2:
The patent employs curved transitions and rounded geometries in the side channel design, replacing sharp edges with smooth curved surfaces. This spheroidality principle reduces flow separation and turbulence by creating smoother flow paths, thereby improving volumetric flow constancy while maintaining compression effectiveness.
3Loss of energy
If conventional side channel compressor design is used, then compression function is achieved, but efficiency is reduced due to mechanical energy conversion into heat
Solution Approach 1:
The patent optimizes geometric parameters including side channel cross-sectional area distribution, channel depth, and width along the flow path. These parameter changes are designed to minimize flow separation and reduce the conversion of mechanical energy into heat, thereby improving compression efficiency while maintaining the compression function.
Solution Approach 2:
The patent uses curved transition sections and rounded geometries to eliminate sharp edges that cause flow separation. This reduces turbulence and minimizes the conversion of useful mechanical energy into heat, improving overall compression efficiency while preserving the compression function.
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
This design achieves a more constant gas flow with reduced noise generation, improved efficiency, and a smaller device size, suitable for ventilation therapy applications while minimizing health-related issues and noise disturbances.
Implementation Method 1
Because of the centrifugal force that is caused by the high speed of rotation of the impeller and acts on the considered gas molecules, the latter are accelerated radially outward
Implementation Method 2
the highly turbulent flow in the side channel compressor converts a large portion of mechanical energy of the impeller into heat
Data Source
AI summary
The invention relates to a small, low-noise side channel compressor for producing a defined volumetric flow, such as is needed in particular for devices for ventilation therapy. This is achieved by means of a new type of shape of the blade chambers (24) in the impeller (12) and the blade chamber walls (29), which separate the blade chambers and become thicker toward the circumference of the impeller, supported by a high-speed drive and a large number of blade chambers (24) at a small impeller diameter.