Dishwasher Rotary Drum Filter for Self-Cleaning Soil Separation
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Solution Overview
Problem
Conventional dishwashers face inefficiencies in recirculating wash fluid and separating soil particles, leading to suboptimal cleaning performance and increased maintenance needs.
Innovation Solution
A recirculation pump system with a rotary filter and flow diverters is used to efficiently recirculate wash fluid, separating soil particles through centrifugal force and ensuring continuous filter cleaning, reducing maintenance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter system is used in dishwashers, then soil particles can be separated from wash fluid, but the filter requires frequent manual cleaning and maintenance
Solution Approach 1:
The filter system automatically cleans itself through backwashing operation. The pump reverses rotation to create reverse flow that flushes accumulated soil particles from the filter screen, eliminating the need for manual cleaning and maintaining continuous filter performance without user intervention
Solution Approach 2:
The system performs periodic backwashing cycles during operation. The control system activates reverse rotation at predetermined intervals or based on differential pressure sensors, creating periodic self-cleaning actions that prevent filter clogging and maintain reliability without continuous manual maintenance
2Productivity
If wash fluid is recirculated in dishwashers, then cleaning efficiency is improved, but soil particles accumulate and reduce system performance
Solution Approach 1:
The system extracts accumulated soil particles from the recirculated wash fluid through the filter system. The pump draws soiled water through the filter screen, separating soil particles from the wash fluid, and the extracted soil is discharged during backwashing cycles, allowing continuous recirculation without performance degradation
Solution Approach 2:
The system discards accumulated soil particles through periodic backwashing while recovering and recirculating the cleaned wash fluid. The pump reverses to discharge soil particles from the filter, then returns to normal rotation to recirculate the purified wash fluid, maintaining productivity while preventing soil accumulation
3Reliability
If a rotating filter system is implemented, then continuous filter cleaning is achieved, but device complexity increases
Solution Approach 1:
The filter assembly is merged with the pump impeller assembly, with the filter screen positioned within the pump housing. The same motor-driven shaft that rotates the impeller also rotates the filter assembly, eliminating the need for separate drive mechanisms and reducing overall system complexity while enabling continuous self-cleaning functionality
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 system enhances cleaning efficiency by effectively recirculating wash fluid and maintaining filter cleanliness, reducing user maintenance and improving overall dishwasher performance.
Implementation Method 1
separating soil particles through centrifugal force
Implementation Method 2
an impeller rotatably mounted within the chamber and expelling liquid from the chamber through the outlet
Data Source
AI summary
A dishwasher with a tub and a recirculation pump, which includes a housing defining a chamber and having an inlet fluidly coupled to the tub and an outlet fluidly coupled to the tub, an impeller rotatably mounted within the chamber and expelling liquid from the chamber through the outlet, and a filter fluidly disposed between the inlet and the outlet and operably coupled to the impeller for co-rotation.