Cleaning device with flow diverting element with mode filter and use of a flow diverting element with mode filter
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Solution Overview
Problem
Existing cleaning devices face challenges in achieving effective sound attenuation while maintaining high flow efficiency, particularly in the propagation of transverse modes of sound through flow deflection elements.
Innovation Solution
The implementation of a mode filter device on the flow deflection element, specifically positioned on the second tube arm, to suppress transverse modes of sound propagation, combined with geometric configurations and sound absorption materials to enhance sound attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flow deflection element is used to direct airflow, then flow efficiency is improved, but transverse modes of sound propagation are generated causing noise
Solution Approach 1:
A mode filter is introduced as an intermediary component in the second tube arm to suppress transverse modes of sound propagation. The mode filter acts as a mediator that allows the flow deflection element to maintain its flow efficiency while independently addressing the noise problem generated by transverse modes.
Solution Approach 2:
The sound attenuation function is extracted from the flow deflection element itself and implemented as a separate mode filter component. This allows the flow deflection element to focus on directing airflow efficiently while the mode filter specifically targets and suppresses transverse modes of sound propagation in the second tube arm.
2Object-generated harmful factors
If sound attenuation measures are implemented, then noise is reduced, but flow efficiency may be compromised
Solution Approach 1:
The mode filter is positioned specifically in the second tube arm where transverse modes are generated, applying sound attenuation locally rather than throughout the entire flow path. This localized approach ensures noise reduction while minimizing impact on overall flow efficiency.
Solution Approach 2:
The air guidance device is segmented into a first tube arm for airflow intake and a second tube arm for exhaust, with the mode filter applied only to the second tube arm. This segmentation allows sound attenuation to be applied selectively without compromising the flow efficiency of the entire system.
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 approach results in effective sound attenuation with minimal impact on airflow, achieving high transmission loss and maintaining efficient airflow rates.
Implementation Method 1
at least one mode filter which is positioned on the second tube arm... for transverse modes of sound propagation
Data Source
Figure 1
Figure 2~3
Figure 4(1)~4(3)
AI summary
Provided is a cleaning device comprising at least one noise source and an air conducting unit having at least one flow deflection element (10), the at least one flow deflection element (10) having a first pipe arm (16) and a second pipe arm (18), the second pipe arm (18) extending transversely to the first pipe arm (16), sound propagating from the first pipe arm (16) into the second pipe arm (18) during operation of the cleaning device, characterized in that a mode filtering unit (72) for transverse modes of sound propagation is arranged on the at least one flow deflection element (10), the mode filtering unit (72) comprising at least one mode filter (74; 84; 90) that is positioned on the second pipe arm (18).