Side Channel Blower Outlet Geometry for Noise and Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Side channel blowers experience high noise levels due to pressure surges caused by sudden acceleration of compressed air against interruption areas, leading to increased noise emissions.
Innovation Solution
The design features a tangentially extending conveying channel with a radially inner outlet opening that decreases in cross-section as the impeller rotates, allowing fluid to exit pockets without obstacles, and an extended recess behind the outlet opening to reduce pressure pulsations, along with an angled outlet edge that enhances fluid evacuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the outlet opening is extended in the direction of rotation of the impeller to an outlet edge that protrudes into the interruption area, then noise emissions are reduced by preventing pressure surges, but the device complexity increases due to the modified outlet geometry
Solution Approach 1:
The outlet opening is extended in the circumferential direction (tangential dimension) rather than only radially, allowing the outlet edge to protrude into the interruption area. This dimensional extension creates a gradual flow transition that reduces pressure surges and noise emissions while maintaining structural integrity.
Solution Approach 2:
The geometry of the outlet opening is modified by changing its circumferential extent and radial position, creating an outlet edge that protrudes into the interruption area. This parameter change transforms the flow characteristics to eliminate sudden pressure surges, thereby reducing noise emissions.
2Productivity
If the conveying channel extends in a tangential direction to the outlet, then fluid flow efficiency is improved by allowing smooth evacuation, but the housing space requirements increase
Solution Approach 1:
The conveying channel is designed with a tangential extension that follows the curved flow path of the impeller, creating a smooth transition from the conveying pockets to the outlet. This curved geometry improves flow efficiency and prevents turbulence while optimizing the use of available housing space.
Solution Approach 2:
The tangential extension of the conveying channel serves multiple functions: it guides fluid flow smoothly to the outlet, utilizes the centrifugal force generated by the impeller, and integrates with the housing structure to minimize space requirements while maximizing flow efficiency.
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 significantly reduces noise emissions while maintaining or increasing the output volume flow by preventing pressure surges and optimizing fluid flow vectors for efficient evacuation of pockets.
Implementation Method 1
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 2
an additional relaxation area for the fluid being delivered is created behind the outlet opening, in which the pressure increase that is still present can be degraded from the bag, whereby the pressure pulsations occurring are further reduced
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Side channel blowers comprising devices for minimizing noise emissions are known. However, said side channel blowers often are insufficient and limit the volumetric flow to be conveyed. Therefore, a side channel blower is proposed, wherein the at least one conveying channel (12; 14) leads to the outlet (20) substantially in the tangential direction, wherein an outlet opening (58) in the radially bounding wall (33) extends in the direction of rotation of the rotor (4) to an outlet edge (62), which protrudes into the interruption area (28; 30) of the at least one conveying channel (12; 14), wherein an opening (60) is formed on the radially bounding wall (33) directly behind the outlet opening (58) in the direction of rotation of the rotor (4), reducing the extension of the interruption area (32) on the radially bounding wall (33) in the circumferential direction. By means of such an embodiment, a further noise reduction is achieved, and the volumetric flow conveyed is increased.