Dishwasher appliance with a fine filter
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Solution Overview
Problem
Dishwashers face challenges in removing smaller particles from wash fluid, as fine particle filters tend to clog during the early stages of the cleaning process, leading to interrupted fluid flow and reduced pump operating lifetime.
Innovation Solution
A filter assembly with a cylindrical filter medium and rotatable vanes is positioned between the pump and spray body, featuring holes sized for particles between 50 and 600 microns, and a housing design that includes a flared section to collect and remove particles, preventing clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fine particle filter with small孔径 is used, then small particles are effectively removed, but fluid flow is interrupted and pump lifetime is reduced
Solution Approach 1:
The filtration system is segmented into coarse and fine filtering stages, with the coarse filter handling the bulk particle removal and the fine filter handling only small particles. This segmentation prevents the fine filter from clogging, ensuring continuous fluid flow and protecting the pump from starvation, thereby extending pump operating lifetime.
Solution Approach 2:
The coarse filter performs preliminary removal of large particles that would otherwise quickly clog the fine filter. By removing these particles first, the system maintains continuous fluid flow through the fine filter and pump, preventing pump starvation and extending operational duration.
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 out particles, reducing re-deposition on articles and preventing filter clogging, ensuring consistent fluid flow and extending the pump's operating lifetime.
Implementation Method 1
A cylindrical filter medium is positioned within the housing proximate the inlet of the housing
Implementation Method 2
A plurality of vanes is distributed around the cylindrical filter medium. The plurality of vanes is rotatable about the cylindrical filter medium
Data Source
AI summary
A dishwasher appliance includes a filter assembly positioned between a pump and a spray body along a flow path between the pump and the spray body. The filter assembly includes a cylindrical filter medium positioned within a housing proximate an inlet of the housing. A plurality of vanes is distributed around the cylindrical filter medium. The plurality of vanes is rotatable about the cylindrical filter medium.