Wrap-Around Air-Knife Nozzle for Thumb-Area Hand Drying
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Solution Overview
Problem
Existing air-knife hand dryers often struggle to effectively dry the area around the thumb and may not provide efficient drying of both sides of the hand due to their ergonomic design and flow profiles.
Innovation Solution
The hand dryer features an elongate air-knife discharge outlet with a straight part and curved wrap-around ends, creating high-velocity jets of air that target the sides of the hand, encouraging a more closed hand position for improved drying efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional straight nozzles are used, then the structure is simple, but the drying effectiveness on the thumb area and sides of the hand is poor
Solution Approach 1:
The nozzle is designed with curved wrap-around ends that extend around the sides of the user's hand, following the natural curvature of the hand anatomy. This curved configuration allows the air-knife to effectively reach and dry the thumb area and sides of the hand, which are difficult to dry with straight nozzles, thereby improving drying effectiveness without requiring multiple separate nozzle components.
2Productivity
If high-velocity air jets are concentrated on one area, then the drying speed in that area is improved, but the overall hand drying uniformity deteriorates
Solution Approach 1:
The nozzle design incorporates different sections with varying functions: a straight central part for general hand drying and curved wrap-around end parts for targeted drying of the thumb and side areas. This local differentiation allows high-velocity air jets to be concentrated where needed (thumb and sides) while maintaining overall drying uniformity across the entire hand surface.
Solution Approach 2:
The nozzle is segmented into distinct functional zones: the straight part and the curved wrap-around end parts. Each segment serves a specific drying purpose, with the curved ends providing enhanced airflow to difficult-to-dry areas while the straight part covers the central hand regions, achieving both high drying speed in critical areas and overall uniformity.
3Area of stationary object
If the nozzle extends around the hand, then the coverage of hard-to-reach areas is improved, but the manufacturing complexity increases
Solution Approach 1:
The curved wrap-around end parts are designed to extend around the sides of the user's hand, increasing the effective drying coverage area to include the thumb and side regions. Despite the curved geometry, the nozzle can be manufactured as a single integrated component using conventional molding or machining processes, avoiding the need for multiple separate parts and complex assembly procedures.
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 enhances drying efficiency by creating localized high-velocity air jets that target the sides of the hand, particularly the thumb area, and encourages a more closed hand position, reducing dry time.
Implementation Method 1
discharging an air-knife across the width of a user's hand held flat in front of the outlet, thereby mechanically to scrape water from the hand as the hand is moved lengthwise relative to the air-knife
Data Source
AI summary
A hand dryer comprising an elongate air-knife discharge outlet for discharging an air-knife across the width of a user's hand held flat in front of the outlet, thereby mechanically to scrape water from the hand as the hand is moved lengthwise relative to the air-knife. The elongate air-knife discharge outlet comprises a straight section for facing the palm or back of the user's hand and a curved, wrap-around end section for extending at least part way around one of the sides of the user's hands. The geometry of the air-knife discharge outlet creates a flow profile which targets the side of the hand with a relatively high-velocity jet of air effective in particular for drying the area around the thumb of a user.