Vacuum Cleaner Exhaust Filter Wall for Low-Noise Airflow
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Solution Overview
Problem
Portable vacuum cleaners generate significant noise during operation, making their use unpleasant and requiring a solution that does not compromise suction performance.
Innovation Solution
A portable vacuum cleaner design featuring a cylindrical filter with an internal chamber divided by a sound absorption wall, which separates the air flow into two veins with identical passage sections, reducing acoustic wave amplitudes and frequencies while maintaining low pressure losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional filter is used in the air discharge circuit, then the vacuum cleaner can filter air flow, but significant noise is generated during operation
Solution Approach 1:
The filter's internal chamber is segmented into two separate air streams by the sound absorption wall, dividing the single airflow path into two parallel paths. This segmentation reduces acoustic wave amplitudes by distributing the noise-generating airflow across multiple channels, thereby reducing overall noise emissions while maintaining filtration effectiveness and suction performance.
Solution Approach 2:
A sound absorption wall is introduced as an intermediary element within the filter's internal chamber. This wall serves as a mediator that absorbs acoustic energy from the airflow while allowing the air to continue flowing through the filter. The sound absorption material reduces noise emissions without creating significant pressure losses that would compromise suction performance.
2Object-affected harmful factors
If a sound absorption wall is added to reduce noise, then noise emissions are reduced, but the device structure becomes more complex
Solution Approach 1:
The sound absorption wall is merged with the existing filter structure, integrating the noise reduction function into the filter housing. Rather than adding a separate noise reduction device, the sound absorption material is incorporated directly into the filter's internal chamber, combining filtration and noise reduction functions in a single integrated component.
Solution Approach 2:
The filter is designed to serve multiple functions simultaneously: it filters airborne particles from the exhaust airflow and absorbs sound waves to reduce noise emissions. By making the filter multi-functional, the need for separate noise reduction components is eliminated, reducing overall device complexity while achieving both filtration and noise control objectives.
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 significantly reduces noise emissions while preserving suction performance, making the vacuum cleaner more pleasant to use without increasing pressure losses.
Implementation Method 1
the air evacuation circuit comprises a sound absorption wall which extends at least partly into the internal chamber of the filter
Data Source
Figure 1~2
Figure 3~4
AI summary
The handheld vacuum cleaner (2) includes a main body (3) equipped with a suction duct (6), and a suction motor (5) housed in the main body (3) and configured to generate an airflow through the suction duct (6), the main body (3) including an air exhaust circuit (18) through which the airflow generated by the suction motor (5) is exhausted to the outside of the main body (3). The air exhaust circuit (18) includes a filter (19) having a generally cylindrical shape and delimiting an internal chamber which is fluidly connected to an air discharge orifice of the suction motor (5), and a sound absorption wall (23) which extends at least partly into the internal chamber of the filter (19), an internal surface of the filter (19) and the sound absorption wall (23) delimiting a first air stream and a second air stream in each of which a part of the airflow is intended to circulate.