Dishwasher Rotating Filter With Artificial Boundary for Soil Separation
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Solution Overview
Problem
Conventional dishwashing machines face inefficiencies in filtering soils from recirculated wash liquid, leading to re-deposition of soils on utensils and increased maintenance requirements.
Innovation Solution
A liquid filtering system with a rotating filter and artificial boundaries within the recirculation flow path, utilizing centrifugal force and shear zones to separate soils from the wash liquid, and designed to reduce noise by non-axial alignment of flow diverters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filters are used in dishwashing machines, then filtration function is provided, but filtration efficiency is insufficient leading to soil re-deposition
Solution Approach 1:
The filter is divided into multiple filtration zones with different pore sizes - a coarse filtration zone for initial soil removal and a fine filtration zone for capturing smaller particles. This segmented approach prevents soil re-deposition by ensuring thorough filtration at multiple stages
Solution Approach 2:
The filter incorporates a rotating component that dynamically adjusts the filtration surface area in contact with the wash liquid. This dynamic adjustment optimizes filtration efficiency throughout the wash cycle, maintaining high performance and preventing soil re-deposition
2Reliability
If traditional filtration systems are used, then soil separation is achieved, but maintenance requirements increase
Solution Approach 1:
The filter system incorporates self-cleaning functionality where the rotating mechanism automatically redistributes and removes accumulated soils during the wash cycle. This self-service capability significantly reduces maintenance requirements while maintaining effective soil separation
Solution Approach 2:
The filter operates with periodic rotation that creates cycles of filtration and self-cleaning. This periodic action prevents soil buildup on the filter surface, maintaining separation efficiency and reducing the frequency of manual maintenance
3Device complexity
If flow diverters are aligned axially with the filter, then structural simplicity is maintained, but noise levels increase
Solution Approach 1:
The flow diverter is positioned at an asymmetric angle relative to the filter axis, creating a non-axial alignment. This asymmetric configuration disrupts turbulent flow patterns that generate noise while maintaining the relatively simple overall structure of the system
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
Enhances filtration efficiency, reduces user maintenance, and decreases noise levels in dishwashers by effectively removing soils from the wash liquid and optimizing the dishwasher's performance.
Implementation Method 1
utilizing centrifugal force and shear zones to separate soils from the wash liquid
Implementation Method 2
utilizing centrifugal force and shear zones to separate soils from the wash liquid
Data Source
AI summary
A liquid filtering system for a dishwasher, having a housing defining a filter chamber and configured to be fluidly coupled to a recirculation flow path of the dishwasher, a filter located within the filter chamber and having a first end axially spaced from a second end and defining a filter there between that has a first surface and a second surface, the filter being positioned within the recirculation flow path to filter soils from liquid flowing through the recirculation flow path as the liquid passes through the filter and a flow diverter to aid in cleaning the filter.