Combination washer-dryer with expandable drum
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Solution Overview
Problem
Combination washer dryers face issues with uneven washing and drying capacities due to a single drum serving both functions, leading to improper drying and lint clogging, making them unreliable household appliances.
Innovation Solution
A radially expandable drum with flexible gaskets that contracts during the washing phase for efficient cleaning and expands during the drying phase to enhance air circulation, controlled by sensors and motors for automated expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single drum is used for both washing and drying functions, then space is saved and convenience is improved, but washing and drying capacities become uneven leading to improper drying and lint clogging
Solution Approach 1:
The drum's internal volume is made dynamically adjustable through radial expansion and contraction. During washing phase, the drum maintains a compact configuration for effective washing. During drying phase, the drum radially expands to increase internal volume, improving air circulation and drying performance. This dynamic adaptation resolves the contradiction by allowing the same drum to optimize its geometry for each specific function.
Solution Approach 2:
The drum geometry parameter (internal volume) is changed between washing and drying phases through radial expansion. The drum transitions from a smaller compact volume during washing to a larger expanded volume during drying, thereby adapting its physical parameters to match the requirements of each phase and eliminating the performance imbalance.
2Ease of manufacture
If a fixed drum design is used, then manufacturing is simpler, but the appliance cannot optimize performance for both washing and drying phases
Solution Approach 1:
The drum is segmented into multiple expandable sections or panels that can radially expand and contract independently or in unison. This segmentation allows the drum to change its overall geometry while maintaining manufacturing feasibility through modular construction. Each segment can be manufactured separately and then assembled with expansion joints, balancing manufacturing simplicity with functional adaptability.
Solution Approach 2:
The drum transitions from a static fixed design to a dynamic expandable design. The drum incorporates expansion mechanisms that allow it to radially expand during drying and contract during washing, enabling phase-specific optimization while maintaining a relatively simple base structure that can be manufactured using standard techniques.
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 improves cleaning efficiency during washing and drying efficiency, reducing lint buildup and enhancing the reliability of combination washer dryers by optimizing drum volume for each phase.
Implementation Method 1
The sections can be interconnected by a plurality of flexible gaskets. The drum can be configured to expand radially
Implementation Method 2
an expansion and contraction motor operatively coupled with the drum in the housing to drive radial expansion and contraction of the drum
Data Source
AI summary
A drum for a combination washer dryer can include a plurality of sections. The sections can be interconnected by a plurality of flexible gaskets. The drum can be configured to expand and contract radially. The drum can radially expand to dry wet laundry during a drying phase following a washing phase in which laundry is washed.