Rotating Dishwasher Filter Assembly for Self-Cleaning Filtration
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Solution Overview
Problem
Conventional dishwashers face challenges in effectively filtering and recirculating wash liquid due to clogging issues in the filter system, which can lead to reduced efficiency and increased maintenance requirements.
Innovation Solution
A dishwasher design incorporating a rotating filter with a diverter system and a controller that adjusts the gap size based on clogging levels, along with a sensor to monitor filter clogging, ensures efficient filtration and recirculation by applying increased shear forces to remove soil particles and prevent re-deposition on utensils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is used to remove soil particles from wash liquid, then filtration efficiency is improved, but the filter becomes clogged and requires maintenance
Solution Approach 1:
The rotating filter assembly performs self-cleaning during its rotation cycle. The diverter creates a gap that allows wash liquid to flow through and flush soil particles from the filter screen, enabling the filter to clean itself without external intervention or maintenance
Solution Approach 2:
The system discards accumulated soil particles by flushing them away through the gap created by the diverter during filter rotation, recovering filtration capacity continuously without requiring manual intervention or disposal operations
2Reliability
If a rotating filter is used to prevent re-deposition of soil particles, then cleanliness of utensils is improved, but device complexity increases
Solution Approach 1:
The filter assembly rotates during operation rather than remaining stationary, dynamically changing its position to alternately present clean and soiled surfaces to the wash liquid flow, preventing re-deposition without requiring complex external mechanisms
Solution Approach 2:
The rotating filter assembly combines multiple functions in a single component: filtration of soil particles, self-cleaning through rotation, and prevention of re-deposition, eliminating the need for separate mechanisms for each function
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 enhances filtration efficiency, reduces maintenance needs, and maintains dishwasher performance by dynamically adjusting the filter's operation to manage clogging, ensuring clean utensils and optimal operation.
Implementation Method 1
a rotating filter having an upstream surface and a downstream surface and located within the recirculation flow path such that the sprayed liquid passes through the filter from the upstream surface to the downstream surface to effect a filtering of the sprayed liquid
Implementation Method 2
a diverter overlying and spaced from at least a portion of the upstream surface to form a gap therebetween... applying increased shear forces to remove soil particles and prevent re-deposition on utensils
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.