Scooped Dryer Drum Vane to Break Harmonic Tumbling
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Solution Overview
Problem
Conventional laundry dryer vanes are prone to harmonic tumbling, leading to rolling and balling of the load, and delicates often become stuck on the exhaust air grill, reducing airflow and drying effectiveness.
Innovation Solution
A scooped or 'saddle' shaped mixing dryer vane with tall end portions and a reduced height central portion, featuring an arcuate upper surface and propeller-like twist, which directs clothes towards the center of the drum and sweeps them away from the exhaust grill, breaking harmonic tumbling and facilitating the dislodging of stuck items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional dryer vanes with linear configurations are used, then the structure is simple and easy to manufacture, but harmonic tumbling occurs leading to rolling and balling of the load
Solution Approach 1:
The vane features an asymmetric profile with a forward-facing inclined surface and a rearward-facing inclined surface that differ in angle and geometry. This asymmetry creates non-uniform lifting and tumbling action that disrupts harmonic tumbling patterns, preventing load rolling and balling while maintaining manufacturing feasibility through single-piece molding
Solution Approach 2:
The vane incorporates curved and contoured surfaces including a concave portion and rounded edges instead of sharp angles. These curved surfaces guide laundry items more smoothly through the tumbling cycle, reducing impact forces that cause balling while maintaining effective lifting action
2Device complexity
If conventional dryer vanes are used, then the design is simple, but delicates become stuck on the exhaust air grill reducing airflow and drying effectiveness
Solution Approach 1:
The vane is designed with multiple functional zones including a forward-facing inclined surface for lifting, a rearward-facing inclined surface for releasing, and a concave portion for containing items. This segmentation of functions within a single component allows delicate items to be properly positioned and released, preventing them from becoming stuck on the exhaust grill
Solution Approach 2:
Different portions of the vane have different geometric properties optimized for specific functions: the forward-facing surface has a specific inclination angle for gentle lifting of delicates, the concave portion provides a containment zone, and the rearward-facing surface has different geometry for controlled release. This local optimization prevents delicate items from becoming stuck on the exhaust grill
Data Source
AI summary
A mixing laundry dryer vane has a general profile which is scooped or “saddle” shaped. The mixing dryer vane has two relatively tall end portions and a reduced height central portion. The mixing dryer vane may have an upper surface that extends arcuately from one taller end portion to the other taller end portion. The arcuate shape may define along the length of the vane a relatively deep concavity which defines the reduced height central portion. The mixing dryer vane's taller end portions may be configured and positioned to cause “wiping” of clothes off and away from an exhaust duct grill within the dryer. The taller end portions of the vane may have a generally propeller-like twist that directs clothes towards the scooped central portion of the vane. The scooped mixing vane in combination with other non-scooped dryer vanes can reduce or eliminate the tendency of harmonic tumbling of a load.