Dishwasher Circulation Filter Using Rotational Flow Against Clogging
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Solution Overview
Problem
Existing water-carrying household appliances, such as dishwashers, face challenges in maintaining filter reliability due to clogging issues caused by filter cake formation, which can lead to blockages in the pipe system and reduced efficiency in filtering out small particles.
Innovation Solution
Incorporating an additional filter in the hydraulic circuit of the dishwasher, specifically in the circulation pump's pressure chamber, which utilizes a rotational flow to prevent clogging and ensures complete flow over the filter surface, combined with a paddle wheel and stator design for high turbulence and extended residence time of the rinsing liquid, and disc-shaped filter media for enhanced filtration and easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is installed in the hydraulic circuit to filter circulated washing liquid, then filtration effectiveness is improved, but the filter surface becomes clogged due to filter cake formation
Solution Approach 1:
The patent introduces a rotation generator that creates rotational movement of the washing liquid in the filter housing. This dynamic approach transforms the static filtration process into a dynamic one, where the rotating liquid flow prevents filter cake formation by continuously sweeping particles away from the filter surface, thereby maintaining both filtration effectiveness and liquid passage.
Solution Approach 2:
The patent utilizes hydraulic principles by creating a vortex flow pattern in the filter housing. The rotation generator imparts rotational motion to the liquid, creating centrifugal forces that push particles outward and prevent them from accumulating on the filter surface. This hydraulic approach maintains filtration while preventing clogging.
2Ease of operation
If a circulation pump is used to circulate washing liquid through spray arms, then uniform application of rinsing liquid is improved, but small particles clog the spray arm openings
Solution Approach 1:
The patent positions the filter housing with its filter surface in the flow path of the circulation pump. This preliminary filtration action occurs before the liquid reaches the spray arms, removing small particles that would otherwise clog the spray arm openings. The rotational movement enhances this preliminary filtration by preventing particle accumulation on the filter surface.
Solution Approach 2:
The filter housing acts as an intermediary element between the circulation pump and the spray arms. It performs preliminary filtration of the washing liquid, removing particles that could clog the spray arms while allowing the circulation system to maintain uniform liquid distribution.
3Reliability
If multiple filter types (coarse sieve, fine sieve, micro sieve) are used to prevent pipe system contamination, then particle retention is improved, but the system complexity increases
Solution Approach 1:
The patent combines the filtration function with the circulation pump housing into a single integrated unit. The filter housing is positioned within or as part of the pump structure, eliminating the need for separate filter assemblies and reducing overall system complexity while maintaining multi-stage filtration effectiveness.
Solution Approach 2:
The filter housing serves multiple functions: it acts as both a filtration device and an integral part of the circulation system. The rotational movement mechanism simultaneously performs both filtration and particle removal functions, reducing the need for separate components and simplifying the overall system architecture.
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 ensures unhindered passage of rinsing liquid, prevents filter clogging, and maintains high filter performance by constantly flushing the filter surface, allowing for effective filtration of finely dispersed dirt particles and reducing the risk of blockages, thereby enhancing the overall reliability of the filtration system.
Implementation Method 1
The rotation of the circulated rinsing liquor or its turbulent flow ensures that the filter surface of the additional filter does not become clogged due to filter cake formation
Implementation Method 2
The means generating a rotation of circulated rinsing liquor comprise a circulation pump for circulating rinsing liquid
Data Source
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AI summary
The invention relates to a water conducting household appliance, particularly a dishwasher or a washing machine, having a hydraulic circuit, in which cleaning fluid can be recycled and in which at least one further filter (23) is provided for filtering recycled washing liquor. The invention provides that at least one further filter (23) is provided in the hydraulic circuit for filtering recycled washing liquor, said filter being disposed in a region of the hydraulic circuit in which the recycled washing liquor is rotated.