Filter with artificial boundary for a dishwashing machine
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Solution Overview
Problem
Conventional dishwashing machines face inefficiencies in filtering soil particles from recirculated wash liquid, leading to re-deposition of soils on utensils and increased maintenance requirements, while also generating noise during operation.
Innovation Solution
A rotating filter system with a cone-shaped filter and artificial boundaries positioned within the recirculation flow path, utilizing centrifugal force and shear forces to separate soil particles from the wash liquid, and designed to reduce noise by aligning the boundaries non-parallel to the rotational axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter system is used in dishwashing machines, then the structure is simple, but filtration efficiency is poor leading to re-deposition of soils on utensils
Solution Approach 1:
The filter system employs a rotating filter assembly that rotates in the same direction as the spray arm, transforming a static filtration system into a dynamic one. This rotation enables the filter to actively engage with the recirculating liquid flow, improving filtration efficiency while preventing soil re-deposition through continuous motion and centrifugal effects.
Solution Approach 2:
The filter assembly is nested within the spray arm structure, with the rotating filter positioned inside the spray arm housing. This nested configuration integrates filtration functionality into the existing spray mechanism, improving filtration performance without significantly increasing overall device complexity.
2Reliability
If a rotating filter system is implemented, then filtration efficiency improves, but device complexity increases
Solution Approach 1:
The rotating filter assembly serves multiple functions simultaneously: it filters soil particles from recirculating liquid, prevents soil re-deposition through rotational motion, and integrates with the spray arm structure. This multi-functionality justifies the increased complexity by delivering multiple performance benefits from a single integrated system.
Solution Approach 2:
The filter assembly is merged with the spray arm structure, combining filtration and spraying functions into a single integrated component. The rotating filter is positioned within the spray arm housing and rotates together with the spray arm, eliminating the need for separate filtration and spraying mechanisms.
3Reliability
If the filter rotates at high speed, then soil separation improves, but noise levels increase
Solution Approach 1:
The system optimizes the rotational speed parameter of the filter assembly to balance soil separation efficiency with noise generation. The filter rotates at a speed sufficient to create effective centrifugal separation of soil particles, while the speed is controlled to minimize excessive noise production from rapid rotation.
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 re-deposition of soils, minimizes user maintenance, and decreases noise levels in dishwashers, improving user satisfaction.
Implementation Method 1
utilizing centrifugal force and shear forces to separate soil particles from the wash liquid
Implementation Method 2
utilizing centrifugal force and shear forces to separate soil particles 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.