Hand Dryer Filtration Layout for Compact Low-Noise Packaging
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Solution Overview
Problem
Conventional hand dryers face challenges in compact design and noise reduction due to the size and noise transmission of single air filters, which restricts their installation depth in wall-mounted applications and increases noise levels.
Innovation Solution
The hand dryer employs multiple parallel air intake paths with separate air filters arranged around the fan unit, featuring offset filter inlets and outlets to prevent noise transmission and allow for space-efficient packaging, including curvi-planar and straight planar filters that are individually replaceable, reducing waste and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single large air filter is used, then the hand dryer can provide sufficient airflow filtration, but the physical size of the hand dryer increases and installation depth is limited
Solution Approach 1:
The single large air filter is divided into multiple smaller air filters (typically 2-4 filters) that are arranged in parallel around the fan unit. Each filter handles a portion of the total airflow, allowing them to be packaged in a space-efficient manner inside the hand dryer housing, thereby reducing the overall device volume while maintaining equivalent filtration capacity.
2Reliability
If a single large air filter is used, then the hand dryer can provide sufficient airflow filtration, but the installation depth of wall-mounted hand dryers is restricted
Solution Approach 1:
By segmenting the filtration system into multiple smaller filters arranged around the fan unit in a radial or circumferential pattern, the depth required for installation is significantly reduced. The filters can be positioned in a compact circular arrangement that minimizes the projection from the wall, enabling compliance with regulations that limit wall-mounted hand dryer projection.
3Volume of moving object
If filters are arranged to face each other, then space efficiency is improved, but noise transmission may increase
Solution Approach 1:
An acoustic insulation material or damping layer is introduced between oppositely arranged filters to prevent noise transmission. This intermediary layer blocks the path of sound waves that would otherwise travel directly from the fan unit through the filters and out of the hand dryer, thereby reducing external noise levels while preserving the compact filter arrangement.
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 design reduces the overall size of the hand dryer, minimizes noise transmission, and allows for easier maintenance by enabling the replacement of filters, while maintaining high-speed airflow for effective hand drying.
Implementation Method 1
the drying mechanism may rely mainly on a momentum-drying effect at the surface of the hands, in which case the airflow will tend to be discharged at high velocity (in excess of 80 m/s, and typically in excess of 140 m/s)
Implementation Method 2
The air is often filtered upstream of the fan unit using an air-filter so that the air discharged through the air outlet is filtered air
Data Source
AI summary
The invention relates to a hand dryer for drying a user's hands by means of an airflow discharged through an air outlet on the hand dryer. The airflow is generated by a motor-driven fan unit. The hand dryer comprises a plurality of air intakes, the air intakes being connected to the fan unit to form a plurality of parallel air-intake paths. Each air intake path is provided with a separate air-filter. The air-filters may be replaceable for individual replacement as required.