Cleaning apparatus with flow deflection element with mode filter
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Solution Overview
Problem
Existing cleaning apparatuses face challenges in achieving effective sound attenuation while maintaining high flow efficiency, particularly in the propagation of transverse modes through flow deflection elements.
Innovation Solution
Incorporating a mode filter device at the second duct arm of a flow deflection element, which includes absorptive or chamber-type sound attenuators or perforated devices, to suppress transverse modes and enhance sound attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flow deflection element is used to guide airflow from the first duct arm to the second duct arm, then flow efficiency is improved, but transverse mode sound propagation occurs causing noise emissions
Solution Approach 1:
A mode filter device is introduced as an intermediary element at the second duct arm to suppress transverse mode sound propagation. The mode filter acts as a mediator between the flow deflection element and the environment, allowing efficient airflow while blocking harmful sound transmission through its specific acoustic filtering properties
Solution Approach 2:
The harmful transverse mode sound propagation is extracted and separated from the main airflow path by positioning the mode filter device at the second duct arm. This extraction approach removes the noise component while preserving the useful airflow function of the deflection element
2Object-generated harmful factors
If sound attenuation measures are implemented in the flow deflection element, then noise emissions are reduced, but flow efficiency may deteriorate
Solution Approach 1:
The mode filter device is strategically positioned at the second duct arm where transverse modes are present, applying sound attenuation locally rather than throughout the entire flow path. This localized approach reduces noise emissions while minimizing interference with the overall airflow efficiency of the deflection element
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 implementation of mode filters at the second duct arm effectively reduces noise emissions while preserving airflow efficiency, achieving high transmission loss and minimal pressure drop.
Implementation Method 1
a mode filter device for transverse modes is arranged at the at least one flow deflection element, having at least one mode filter that is positioned at the second duct arm
Data Source
AI summary
A cleaning apparatus is provided, including at least one noise source and an air guidance device having at least one flow deflection element, wherein the at least one flow deflection element has a first duct arm and a second duct arm, wherein the second duct arm is oriented transversely to the first duct arm, and wherein, during operation of the cleaning apparatus, there is sound propagation from the first duct arm to the second duct arm, wherein a mode filter device for transverse modes of sound propagation is arranged at the at least one flow deflection element, having at least one mode filter that is positioned at the second duct arm.