Rotating Dishwasher Filter With Artificial Boundary Soil Deflection
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Solution Overview
Problem
Conventional dishwashing machines face inefficiencies in separating soil particles from recirculated wash liquid, leading to re-deposition of soils on utensils and increased maintenance needs.
Innovation Solution
A rotating filter with an artificial boundary creates an increased shear force zone to deflect soils towards specific ends, where they accumulate, enhancing filtration efficiency and reducing re-deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter is used in the recirculation flow path, then liquid filtration is achieved, but soil particles are not effectively removed from the upstream surface, leading to re-deposition on utensils
Solution Approach 1:
The filter assembly is rotated at a controlled rate to generate shear forces between the wash liquid and soil particles on the upstream surface. This rotational motion creates a mechanical action that prevents soil accumulation and eliminates re-deposition, transforming a static filtration system into a dynamic one that actively removes contaminants.
Solution Approach 2:
A stationary artificial boundary is introduced as an intermediary element between the rotating filter and the liquid flow. This boundary creates an increased shear force zone that enhances the removal of soil particles from the filter surface, acting as a mediator that amplifies the filtration effect without requiring direct contact with the rotating components.
2Productivity
If the filter rotates to prevent soil accumulation, then soil removal is improved, but the complexity of the filtration system increases
Solution Approach 1:
The filter element and filter holder are merged into a single rotatable assembly, allowing the entire filtration system to rotate as one unit. This integration simplifies the mechanical structure by eliminating the need for separate drive mechanisms for the filter element, reducing overall system complexity while maintaining effective soil removal.
Solution Approach 2:
The filter assembly transitions from a static to a dynamic configuration by incorporating rotation capability. This dynamic element allows the system to adapt to varying flow conditions and maintain optimal filtration performance without requiring complex control systems or multiple components, achieving simplicity through controlled motion.
3Force
If an artificial boundary is added to increase shear force, then soil deflection is improved, but the device complexity increases
Solution Approach 1:
The artificial boundary is strategically positioned only at the upstream surface where soil accumulation occurs, rather than throughout the entire filter assembly. This localized approach creates the necessary shear force zone precisely where needed, maximizing soil deflection efficiency while minimizing the addition of complex components to the overall 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
The solution effectively filters soils from the recirculated liquid, minimizing re-deposition on utensils and reducing user maintenance by maximizing dishwasher performance.
Implementation Method 1
a first artificial boundary overlying and spaced from at least a portion of the upstream surface to form an increased shear force zone therebetween to apply a greater shear force on the upstream surface
Implementation Method 2
having a surface oriented at an angle relative to the central axis to deflect soils near the upstream surface toward the one of the first and second ends
Implementation Method 3
rotation of the filter while liquid is passing through along the recirculation flow path results in soils residing near the upstream surface and the soils are directed toward the one of the first and second ends where the soils accumulate
Data Source
AI summary
A dishwasher with a tub at least partially defining a treating 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.