Side Channel Blower Cross-Section Reducer Noise Volume
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Side channel blowers experience pulsations leading to high structure-borne noise emissions, and existing solutions that reduce noise by using a cross-section reducer limit the delivery volume.
Innovation Solution
A cross-section reducer with a steadily increasing radial extent from the inlet to the outlet, featuring two shoulders at the conveying channel's cross-section, reduces noise emissions and increases delivery volume by minimizing turbulence and pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cross-section reducer is used to reduce noise emissions, then noise level is reduced, but delivery volume is limited
Solution Approach 1:
The cross-section reducer is designed with non-uniform reduction: the radial extent increases steadily from inlet to outlet, creating different reduction rates at different positions. This local variation in reduction geometry allows the channel to maintain larger cross-section area for higher delivery volume while still providing sufficient reduction to minimize turbulence and noise at the outlet region.
Solution Approach 2:
Instead of reducing the cross-section uniformly across the entire channel, the invention introduces a dimensional variation along the axial direction. The cross-section reducer extends from the center of the conveying channel and its radial extent changes continuously from inlet to outlet, transforming a one-dimensional reduction problem into a two-dimensional solution that optimizes both flow capacity and noise reduction.
2Object-affected harmful factors
If the conveying channel depth is reduced to minimize turbulence, then noise emissions are reduced, but delivery volume decreases
Solution Approach 1:
The cross-section reducer creates a dynamic flow condition where the effective channel depth varies continuously along the flow direction. The radial extent increases steadily from inlet to outlet, meaning the flow cross-section adapts along the channel length, allowing larger overall delivery volume while maintaining controlled turbulence characteristics through the gradual geometric transition.
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 enhances the delivery volume while maintaining maximum pressure and significantly reduces noise emissions, even with a small reduction in conveying channel depth, such as 0.1 mm to 2 mm, and is easily producible in automated systems without additional components.
Implementation Method 1
the conveying channel has two shoulders in the cross-section to the adjoining wall surfaces of the conveying channel... preventing turbulence when the air enters the impeller from the delivery channel
Implementation Method 2
When the impeller rotates, the conveyed fluid in the pockets is accelerated in the circumferential direction and in the radial direction by the conveying blades, so that a circulating turbulent flow is created in the conveying channel
Implementation Method 3
the cross-section reducer is intended to reduce the speed difference between the fluid flowing into the impeller from the conveying channel and the conveying blade speed, as a result of which the noise level is reduced. In addition, this should increase the achievable static pressure
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Differently designed side channel blowers with means for noise reduction are known. Aside from noise reduction, there is also a need for a larger maximal conveying volume whilst retaining the same size. According to the invention, a side channel blower having a cross-sectional reducer (52; 58) which reduces the depth of the feed channel (12; 14) over a predefined section, is proposed, characterized in that the radial extension of the cross-sectional reducer (52; 58) increases continuously from the inlet (6) towards the outlet (20) and the conveying channel (12; 14) comprises in the cross section two steps to successive wall surfaces (54; 61) of the conveying channel (12; 14). In this way, the maximal conveying volume stream can be increased whilst reducing the pressure pulsation and noise level.