Hand Dryer Cavity Shape for Uniform Air-Jet Drying
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Solution Overview
Problem
Existing hand dryers often dry hands unevenly, leading to discomfort and inefficiency as users need to dry different parts of their hands sequentially, resulting in longer drying times and reduced user experience.
Innovation Solution
A hand dryer design featuring a casing with a cavity shaped to accommodate hands, equipped with slot-like openings for airflow that ensures uniform distance from the hands to the air jets, with a straight front edge and curved rear edge to match the natural shape of hands, allowing for consistent drying across the entire hand surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the cavity is shaped with curved walls and nozzles positioned accordingly, then the drying coverage is improved, but the distance uniformity between nozzles and hands deteriorates, resulting in uneven drying rates
Solution Approach 1:
The cavity rear edge is shaped with curved portions that follow the natural contour of human hands, creating a form-fitting cavity entrance. This curvature ensures that when hands are inserted, the distance from any point on the hands to the slot-like openings remains substantially uniform, resolving the contradiction between coverage and distance uniformity
Solution Approach 2:
The slot-like openings are positioned along the rear edge of the cavity entrance where they can uniformly service the entire hand surface. The localized positioning of these openings in relation to the curved cavity shape ensures consistent drying performance across different hand positions and orientations
2Area of stationary object
If multiple nozzles are positioned at different locations, then the drying coverage is improved, but the drying time increases due to sequential drying of different hand parts
Solution Approach 1:
The slot-like openings are arranged to provide continuous drying action across the entire hand surface simultaneously. The uniform distance from all hand surfaces to the openings ensures that drying occurs evenly and concurrently across palms, fingers, and backs of hands, eliminating sequential drying delays
Solution Approach 2:
The drying function is segmented into multiple slot-like openings distributed along the rear edge, with each segment contributing to drying a specific region. This segmentation allows parallel drying of different hand areas while maintaining uniform distance for consistent drying rates across all segments
3Ease of operation
If the cavity entrance is made larger to accommodate hands more easily, then the ease of operation is improved, but the distance uniformity between openings and hands deteriorates
Solution Approach 1:
The cavity entrance is shaped with curved portions that naturally guide hands into the correct position. This ergonomic shaping facilitates easy insertion while simultaneously ensuring that the hands assume a position where uniform distance to the slot-like openings is maintained, resolving the contradiction between ease of operation and distance precision
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 enables even and rapid hand drying, minimizing the time required to dry hands completely and ensuring all areas are effectively dried in a single pass, enhancing user comfort and efficiency.
Implementation Method 1
a fan located in the casing and capable of creating an airflow
Implementation Method 2
narrow streams of high velocity, high pressure air to dry a user's hands
Data Source
Figure 1~2
Figure 2a
Figure 3
AI summary
Hand drying apparatus (10) has a casing (12), a cavity (30) formed in the casing (12) for receiving for receiving a user's hands, a fan (40) located in the casing (12) and capable of creating an airflow, and a plurality of openings (60, 62) communicating with the fan (40) and arranged to direct an airflow transversely across the cavity (30). The cavity (30) has an entrance (32) delimited by a front edge (32a) and a rear edge (32b) in which the openings (60, 62) are located. The shape of the front and rear edges (32a, 32b) is such that, when in use the user's hands are introduced to the cavity (30), the distance between the user's hands and the nearest opening (60, 62) is substantially uniform. Alternatively, one of the edges (32a) is substantially straight and the other of the said edges (32b) is curved so that the distance between the said edges (32a, 32b) varies along the length of the cavity entrance (32). These arrangements enhance the drying efficiency of the dryer.