Rotating Dishwasher Filter With Diverter Gap for Soil Removal
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Solution Overview
Problem
Conventional dishwashers face challenges in effectively filtering soils from recirculated liquid, leading to potential re-deposition of soils on dishes and increased maintenance needs.
Innovation Solution
A dishwasher design incorporating a rotating filter with a diverter system that creates a gap between the filter and diverter surfaces, utilizing a biasing device to maintain contact and ensure efficient filtration, along with a recirculation pump assembly that includes a shroud and multiple access openings to enhance soil removal and minimize re-deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filter system is used in a dishwasher, then the structure is simple, but the filtration effectiveness is insufficient leading to soil re-deposition on dishes
Solution Approach 1:
The filter system employs a rotating filter assembly that rotates during operation to dynamically collect soils from the liquid stream. This dynamic rotation allows the filter to continuously present fresh filtration surfaces to the liquid flow, significantly improving filtration effectiveness and preventing soil re-deposition on dishes, while maintaining a relatively simple overall structure
Solution Approach 2:
The invention introduces a vertical dimension to filtration by using a rotating filter assembly with multiple filter surfaces arranged vertically. The rotation mechanism allows soils to be collected and removed in the vertical dimension, enhancing filtration capability without requiring a complex multi-component horizontal filtration system
2Productivity
If a rotating filter with diverter system is implemented, then soil removal efficiency is improved, but manufacturing precision requirements increase due to gap specifications
Solution Approach 1:
The diverter is designed with adjustable parameters including gap distance (0.25-1 mm) and gap width (1-5 mm) from the filter surface. These parameter ranges provide optimal soil removal efficiency while accommodating normal manufacturing tolerances, reducing the stringency of precision requirements
Solution Approach 2:
The rotating filter assembly dynamically maintains the gap between the diverter and filter surfaces through its rotation mechanism. This dynamic operation allows for effective soil removal while being tolerant of manufacturing variations, as the rotation ensures consistent performance across the gap range
3Ease of manufacture
If multiple tolerance stack-ups are present in the diverter-filter assembly, then ease of assembly is improved, but the gap consistency and filtration performance deteriorate
Solution Approach 1:
The filter assembly is segmented into distinct components: the rotating filter assembly, the diverter, and the pump housing. This segmentation allows each component to be manufactured and assembled independently with standard tolerances, simplifying manufacturing while the designed single tolerance stack-up path ensures gap consistency is maintained through proper component interface design
4Stability of the object's composition
If the diverter is fixed rigidly to the filter, then structural stability is improved, but adaptability to filter rotation and wear compensation is reduced
Solution Approach 1:
The diverter is coupled to the rotating filter assembly through a dynamic connection that allows relative movement. This dynamic coupling enables the diverter to accommodate filter rotation while maintaining structural stability, and provides wear compensation through the ability to adjust or replace the diverter independently of the filter assembly
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 liquid, reducing re-deposition on dishes and requiring less user maintenance by ensuring continuous performance of the dishwasher.
Implementation Method 1
a rotating filter located within the circulation circuit such that the circulated liquid passes through the filter from an upstream surface to a downstream surface
Implementation Method 2
a biasing device relatively biasing the rotating filter and the first diverter such that the filter bearing surface and the diverter bearing surface contact
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.