Rotating Dishwasher Filter With Shear Zone Against Soil Re-Deposition
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Solution Overview
Problem
Dishwashers face inefficiencies in separating soil particles from wash fluid, leading to potential re-deposition of soils on utensils and increased maintenance requirements.
Innovation Solution
A dishwashing machine with a liquid recirculation system and a rotating filter assembly that includes an artificial boundary to create an increased shear force zone, enhancing the filtration of wash fluid and preventing soil re-deposition by applying greater shear forces on the upstream surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional filter is used in the dishwashing machine, then the structure is simple, but the filtration efficiency is insufficient leading to soil re-deposition on utensils
Solution Approach 1:
The filter is designed to rotate during operation, transforming from a static to a dynamic structure. This rotation creates varying shear forces across the filter surface that prevent soil particles from adhering and re-depositing on filtered utensils, thereby improving filtration efficiency without requiring a fundamentally complex filter design
Solution Approach 2:
The filter surface is divided into multiple zones with different characteristics, including an increased shear force zone created by the artificial boundary. This segmentation allows different portions of the filter to perform different functions - some areas focus on particle capture while others prevent re-deposition, improving overall filtration efficiency
2Reliability
If a stationary filter is used, then the structure is simple, but soil particles re-deposit on the filter surface and utensils
Solution Approach 1:
The filter rotates to create dynamic shear forces that actively prevent soil particles from re-depositing on both the filter surface and utensils. This mechanical motion provides a reliable method to continuously clear particles without requiring complex chemical or thermal systems
Solution Approach 2:
The rotation of the filter creates mechanical motion and shear forces that act similarly to vibration, disrupting the adhesion of soil particles to surfaces and preventing re-deposition through mechanical action rather than complex control systems
3Productivity
If the filter surface area is increased to improve filtration, then the filtration capacity increases, but the device complexity and space requirements increase
Solution Approach 1:
The rotating filter allows a compact surface area to achieve higher effective filtration capacity through continuous motion. The rotation ensures all filter surfaces are actively engaged in filtration and particle prevention, maximizing the utility of the available filter area without requiring excessive space or complex multi-filter assemblies
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 effectively filters soil particles from the wash fluid, reducing re-deposition on utensils and minimizing user maintenance by maximizing filtration efficiency throughout the dishwasher's operation.
Implementation Method 1
liquid passing between the first artificial boundary and the rotating filter applies a greater shear force on the upstream surface than liquid in an absence of the first artificial boundary
Data Source
AI summary
A dishwasher with a tub at least partially defining a washing chamber, a liquid spraying system, a liquid recirculation system defining a recirculation flow path, and a liquid filtering system. The liquid filtering system includes a rotating filter disposed in the recirculation flow path to filter the liquid.