Vacuum Cleaner Baffle Assembly for Noise Reduction Without Pressure Drop
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Solution Overview
Problem
Vacuum cleaners emit noise primarily due to the motor and fan unit, with conventional noise reduction methods failing to effectively confine noise within the enclosure, as it escapes through air inlets and outlets.
Innovation Solution
A vacuum cleaner design featuring a baffle device with inclined baffles that separate airflow while reflecting sound back towards the noise source, minimizing noise emission without compromising suction power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pre-motor filter is used to prevent particles from entering the motor and fan unit, then particle protection is improved, but noise emission upstream increases as noise escapes through the filter
Solution Approach 1:
The filter assembly is segmented into multiple functional zones: a first filter medium for particle filtration, a baffle device with inclined surfaces to redirect airflow and block noise, and a second filter medium for additional filtration. This segmentation allows each component to perform its specific function while collectively reducing both particle passage and noise emission.
Solution Approach 2:
The baffle device acts as an intermediary element between the incoming airflow and the motor/fan unit. Its inclined surfaces redirect the airflow path and physically block the direct transmission of noise from the filter assembly to the upstream environment, while still allowing filtered air to pass through to the motor.
2Object-generated harmful factors
If noise confinement enclosure is used to contain motor and fan unit noise, then noise containment is improved, but airflow restriction increases due to limited inlet and outlet paths
Solution Approach 1:
The baffle device utilizes three-dimensional spatial arrangement with inclined surfaces at specific angles to redirect airflow in multiple directions. This dimensional approach allows noise containment within the enclosure while maintaining adequate airflow paths to the motor and fan unit, avoiding the need to restrict inlet and outlet openings.
3Object-generated harmful factors
If traditional flat baffle is used to block noise, then noise blocking is improved, but airflow disruption increases causing pressure drop and reduced suction power
Solution Approach 1:
The baffle device employs inclined surfaces instead of flat perpendicular baffles. These angled surfaces smoothly redirect airflow around the noise blocking elements, reducing turbulence and pressure drop. The curved or angled geometry allows acoustic isolation while maintaining airflow continuity and suction performance.
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 baffle device significantly reduces noise emission by smoothly distributing airflow and reflecting sound, maintaining suction power and simplicity in construction.
Implementation Method 1
air flowing the along the passageway initially impacts the inclined upstream surfaces of the upstream set of baffles, which act to smoothly separate and distribute the airflow through the elongate openings therebetween
Implementation Method 2
Sound propagating upstream of the passageway from the fan or other noise source impacts the inclined downstream surfaces of the downstream set of baffles, which act as reflectors to scatter and reflect the sound back towards the noise source
Data Source
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AI summary
A vacuum cleaner comprises a baffle assembly 19 mounted upstream of a motor and fan unit 16 and downstream of a filter bag or other separation device housed inside chamber 11. The baffle assembly 19 comprises upstream and downstream baffles 23A, 23B which are V-shaped in section and which are directed upstream. The downstream baffles 23B are staggered with respect to the upstream baffles 23A and lie downstream of openings between the upstream baffles 23A. The aerodynamic shape of the baffles 23A, 23B allows air to flow freely from the chamber 11 to the motor and fan unit 16 without significant pressure drop. Noise emitted by the motor and fan unit 16 is reflected by the inclined downstream surfaces of the baffles 23A, 23B and thus baffle assembly 19 acts to substantially reduce the noise emitted by the cleaner.