Side Channel Blower Noise Reduction via Permeable Chamber Separation
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Solution Overview
Problem
Side channel blowers used in vehicle heaters generate noise during operation, which propagates to the outside environment, requiring external sound absorption solutions.
Innovation Solution
The side channel blower incorporates a configuration with multiple flow chambers separated by permeable chamber separation elements, utilizing flexible materials and strategically oriented flow medium passages to absorb and reflect noise, preventing its propagation to the outside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an external sound absorber is arranged at the duct guiding flow medium to the flow medium inlet opening, then noise propagation is reduced, but device complexity increases
Solution Approach 1:
The patent merges the sound absorption function with the existing blower housing structure by creating flow chambers within the housing interior. The chamber separation elements that separate flow chambers also serve as sound absorption materials, eliminating the need for separate external sound absorbers and reducing overall device complexity.
Solution Approach 2:
The flow chambers serve multiple functions: they guide the flow medium from the inlet to the outlet while simultaneously acting as sound absorption structures. The chamber separation elements perform both structural separation and acoustic damping functions, making the system more efficient with fewer components.
2Object-affected harmful factors
If multiple flow chambers are provided with chamber separation elements, then noise is effectively muffled, but manufacturing complexity increases
Solution Approach 1:
The blower housing interior is segmented into multiple flow chambers separated by chamber separation elements. This segmentation creates distinct acoustic zones that trap and dissipate noise while maintaining a manageable structure that can be manufactured using standard molding techniques.
Solution Approach 2:
The chamber separation elements are made from porous sound absorption materials that are commonly used in manufacturing. These materials provide effective noise muffling while being compatible with standard injection molding processes, reducing manufacturing complexity compared to custom acoustic treatments.
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 configuration effectively muffles noise generated during operation by reflecting and absorbing sound within the flow chambers, preventing it from reaching the outside environment.
Implementation Method 1
it is ensured in a side channel blower configured according to the present invention that noises generated in the area of the delivery duct are effectively muffled by reflection or absorption of sound in the area of the flow chambers through which the flow medium is to flow
Implementation Method 2
the first flow chamber is separated from the second flow chamber by means of at least one chamber separation element that is permeable to the medium being delivered
Data Source
AI summary
A heater side channel blower includes a blower housing (12) with a bottom wall (14) and a circumferential wall (16), that enclose a first flow chamber in a housing interior (18). A ring-shaped delivery duct (22), open towards an outer side of the blower housing (12), is provided at the bottom wall (14). A flow medium inlet (50), for the entry of medium to be delivered into the housing interior (18), is open towards the first flow chamber. A second flow chamber (42) is provided in the housing interior (18). A flow medium outlet (52), for the discharge of medium to be delivered from the housing interior (18), is open towards the delivery duct (22) to the second flow chamber (42). The first flow chamber is separated from the second flow chamber (42) by at least one chamber separation element (60, 62) that is permeable to medium to be delivered.