Rotating Pump-Chamber Filter for Dishwasher Liquor Recirculation
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Solution Overview
Problem
The existing filter systems in water conducting household appliances, such as dishwashers, face challenges in maintaining reliability and preventing blockages in washing liquor pumps due to dirt particles, especially during the circulation of washing liquor, which can lead to filter cake formation and reduced efficiency.
Innovation Solution
An additional filter is integrated into the hydraulic circuit of the dishwasher, specifically in the circulation pump's pressure chamber, where the washing liquor undergoes rotational movement, ensuring the filter surface is constantly cleared of residues and maintaining unimpeded fluid passage. This filter system includes disk-shaped filter means on a hollow cylindrical support, dividing the pressure chamber into inlet and outlet chambers, and is designed to perform microfiltration, potentially replacing the need for filters in the pump sump, allowing for smaller dimensions and reduced dead water heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the circulation pump is configured for small particle size tolerance with fine and micro filters, then spray arm openings are protected from blockage, but the pump sump requires larger dimensions and more dead water to be heated
Solution Approach 1:
The rotating filter element design allows for more compact pump sump dimensions because the rotation continuously clears the filter surfaces, eliminating the need for large sump volumes to accommodate static filter systems with higher safety margins. The dynamic filtration enables reliable small particle retention in a reduced volume.
Solution Approach 2:
The patent changes the operational parameter of the filter system from static to dynamic by introducing rotation. This parameter change allows the filter to maintain high particle retention capability while reducing the required pump sump volume, as the rotating mechanism continuously prevents filter cake formation and maintains filtration efficiency in a compact space.
2Reliability
If multiple filters are installed in the hydraulic circuit, then filtration reliability is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple filtration functions (coarse filtering, fine filtering, and micro filtering) into a single integrated rotating filter element assembly within the pump sump. Instead of installing separate filter systems throughout the hydraulic circuit, all filtration stages are merged into one rotating component that handles the entire filtration process dynamically, reducing overall system complexity while maintaining high filtration reliability.
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 filter reliability by ensuring all circulated washing liquid passes through the additional filter, maintaining high filter performance and preventing blockages, while the rotational movement and turbulence in the pressure chamber keep the filter surfaces clear of residues, ensuring efficient operation and reduced risk of contamination.
Implementation Method 1
The rotation of the circulated washing liquor and/or its turbulent flow means that the filter surface of the additional filter is not affected by filter cake formation
Implementation Method 2
The washing fluid supplied to the additional filter is therefore already precleared so the additional filter can be embodied as a micro filter, which is designed specifically to filter out dirt particles that are finely dispersed in the water
Data Source
AI summary
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 is provided for filtering recycled washing liquor. In an exemplary embodiment, the appliance includes a filter in the hydraulic circuit for filtering recycled washing liquor. The filter may be disposed in a region of the hydraulic circuit in which the recycled washing liquor is rotated.