Sink-Integrated Air-Knife Hand Dryer for Compact Wastewater Drainage
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Solution Overview
Problem
Conventional air-knife hand dryers face challenges in managing waste water effectively, as the non-evaporative water removal mechanism leads to either unhygienic evaporation or frequent drip tray emptying, and their design often restricts sink usage due to size constraints from opposing nozzles.
Innovation Solution
Incorporating an air-knife hand dryer into a sink fixture that utilizes the mains drainage system for water disposal and features side-by-side air-knife outlets arranged at an angle, allowing for compact design and ergonomic user comfort, with a single station for both washing and drying that eliminates the need for 'hand-over-hand' drying action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional air-knife hand dryers use opposing nozzles for mechanical water removal, then water removal efficiency is improved, but device size increases and restricts sink usage
Solution Approach 1:
The hand dryer is merged with the sink fixture, integrating the drying function into the existing sink structure. The air knife outlets are positioned on the sink's rear wall, combining two functions (washing and drying) into a single compact unit, eliminating the need for separate hand dryer equipment.
Solution Approach 2:
The air knife outlets are arranged vertically on the rear wall of the sink rather than horizontally opposing each other. This vertical arrangement in the depth dimension allows for effective water removal while maintaining a compact horizontal footprint that does not restrict sink usage.
2Ease of operation
If conventional air-knife hand dryers use opposing nozzles, then mechanical wiping action is achieved, but hygiene deteriorates due to unhygienic evaporation or frequent drip tray emptying
Solution Approach 1:
The waste water removal function is extracted from the hand dryer system and redirected to the sink's mains drainage system. Water blown off the hands by the air knife flows directly into the sink basin and is disposed of through the existing drainage, eliminating the need for separate drip trays and their associated hygiene issues.
Solution Approach 2:
The sink's existing drainage system serves the hand dryer's waste water disposal needs. The integrated design allows the drainage system to automatically handle waste water from both hand drying and hand washing without requiring separate collection and emptying mechanisms.
3Ease of operation
If air-knife outlets are arranged side-by-side at an angle, then user comfort and ergonomics are improved, but device complexity increases
Solution Approach 1:
The angled air knife outlets serve multiple functions: they provide effective mechanical wiping action, accommodate natural hand positioning during drying, and integrate seamlessly with the sink's rear wall structure. This universal design approach simplifies the overall system by making the outlet arrangement serve multiple purposes simultaneously.
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 solution effectively manages waste water through mains drainage, enhances user comfort, and allows for a more compact and hygienic hand drying experience without the need for separate hand dryers, promoting efficient and ergonomic hand drying.
Implementation Method 1
the air-knife moves across the surface of the hand and, as it does so, wipes or scrapes the water from the surface of the hand
Implementation Method 2
the air-knife is discharged at high speed (>80 m/s) to provide for an efficient wiping action across the surface of the hand
Implementation Method 3
They are invariably low flow, low speed machines which rely on heating the air to promote an evaporative drying effect at the surface of the hand
Implementation Method 4
heating the air to promote an evaporative drying effect
Implementation Method 5
the vast majority of the water on the surface of the hands is instead driven or blasted from the hands by the high-momentum airflow
Data Source
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AI summary
An arrangement incorporates a sink and a hand dryer which extends over the sink. The hand dryer is of the type which uses an air-knife mechanically to wipe the water from the user's hands. The hand dryer comprising two elongate air-knife discharge outlets—each outlet discharging a respective air-knife forwardly onto a hand of the user—the air-knife outlets being arranged side-by-side over the basin of the sink. Each air-knife outlet extends along a part of the hand dryer which is swept back at an angle such that the inboard end the air-knife outlet is in front of the outboard end of the air-knife outlet.