Front-Nozzle Hand Dryer Layout for Compact One-Sided Drying
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Solution Overview
Problem
Conventional hand dryers either require significant depth for opposing nozzles or rely on inefficient 'hand-over-hand' drying methods, limiting design flexibility and user comfort.
Innovation Solution
A wall-mountable hand dryer with separate nozzle sections for each hand, positioned to span the width of a user's hand, allowing for downward pitching and banking to enhance user comfort and reduce machine depth, using high-speed air jets to efficiently dry one side at a time without opposing nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If opposing nozzles are used for two-sided drying action, then both front and back of hands are dried simultaneously, but the machine depth increases significantly to accommodate the nozzles and supply ducting
Solution Approach 1:
The hand dryer is divided into two separate nozzle sections, one for each hand, positioned at the front of the dryer. Each nozzle section spans the width of a user's open hand and directs drying air down onto the front or back of the hand. This segmentation eliminates the need for deep opposing nozzles while maintaining effective drying coverage.
Solution Approach 2:
The nozzle sections are positioned towards the front of the dryer and spaced away from the wall, utilizing the depth dimension efficiently. A downwardly pitched guide part is positioned behind each nozzle section to guide the pitch of the user's hands underneath the nozzles, effectively using the vertical dimension to achieve shallow machine depth while maintaining drying effectiveness.
2Length of stationary object
If a single large nozzle is used for hand-over-hand drying, then machine depth is reduced, but drying efficiency decreases and requires user rubbing action
Solution Approach 1:
Instead of a single large nozzle, the dryer uses two separate nozzle sections, one dedicated to each hand. This allows simultaneous drying of both hands without requiring the user to rub hands together, significantly improving drying efficiency while maintaining a compact depth.
Solution Approach 2:
Each nozzle section is specifically designed to span the width of a user's open hand and direct air down onto the front or back of that specific hand. This localized targeting ensures efficient moisture removal from each hand independently, eliminating the need for hand-rubbing action.
3Productivity
If nozzle sections are positioned at the front spaced from the wall, then drying effectiveness is improved, but machine depth increases
Solution Approach 1:
The nozzle sections are positioned towards the front of the dryer and spaced away from the wall, utilizing the depth dimension efficiently. The downwardly pitched guide part behind each nozzle section guides the pitch of the user's hands underneath the nozzles, effectively using the vertical dimension to achieve shallow machine depth while maintaining drying effectiveness.
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 solution allows for a more compact design while maintaining effective drying, eliminating the need for opposing nozzles and reducing user discomfort by allowing hands to be held comfortably at a banked angle, with high-speed air jets effectively stripping moisture without spray-back.
Implementation Method 1
a motor-driven fan to force air at high pressure through an opposing pair of narrow, slit-like nozzles... This creates two opposing thin sheets, or 'blades', of high velocity air which act to strip water from the front and backs of a user's hands
Implementation Method 2
The air is heated to promote evaporative drying of water moisture on the hands of the user
Data Source
AI summary
A wall-mountable hand dryer for drying one side of a user's hands at a time, the dryer having two nozzle sections—one for each hand—which nozzle sections are positioned towards the front of the dryer so that they are spaced away from the wall in use, the nozzle sections each extending to span the width of a user's open hand and being arranged for directing drying air down onto the front or back of said hand as it is inserted lengthwise underneath the nozzle sections from the front of the dryer, wherein the dryer comprises a downwardly pitched guide part positioned behind each nozzle section for guiding the pitch of the user's hands underneath the nozzle sections.