Rotating Filter Design for Automatic Dishwasher Self-Cleaning
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Solution Overview
Problem
Dishwashers face issues with filter blockages due to accumulated foreign substances, leading to increased flow resistance, reduced washing performance, and the need for manual filter cleaning, which is costly and inefficient.
Innovation Solution
A dishwasher equipped with an automatic cleaning filter featuring a rotating filter with specific inlet and outlet configurations and a driver, which applies a strong shear force to separate foreign substances, reducing blockages and allowing for automatic and effective cleaning without high costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter device is used to filter foreign substances from washing liquid, then washing liquid can be reused and washing performance is improved, but foreign substances accumulate in the filter causing blockages and increased flow resistance
Solution Approach 1:
The filter device performs self-cleaning by utilizing the washing liquid flow and pump pressure to automatically remove accumulated foreign substances from the filter screen, eliminating manual intervention and maintaining continuous operational efficiency without requiring system shutdown or manual maintenance
Solution Approach 2:
Foreign substances captured by the filter are periodically discharged through a dedicated outlet into the sump, where they are separated and removed from the washing liquid circulation system, allowing the filter to maintain its filtering capacity while the washing liquid continues to be reused
2Productivity
If manual cleaning of the filter is performed, then filter blockages are removed and flow resistance is reduced, but maintenance costs increase and operational efficiency decreases
Solution Approach 1:
The filter device performs self-cleaning by utilizing the washing liquid flow and pump pressure to automatically remove accumulated foreign substances from the filter screen, eliminating manual intervention and maintaining continuous operational efficiency without requiring system shutdown or manual maintenance
Solution Approach 2:
The system performs preliminary cleaning action by continuously directing washing liquid through the filter device during normal operation, preventing foreign substance accumulation before it causes blockages, and automatically clearing the filter at scheduled intervals without interrupting the washing cycle
3Ease of operation
If the filter is cleaned automatically using conventional methods, then filter maintenance is reduced, but device complexity and cost increase
Solution Approach 1:
The washing liquid circulation system serves multiple functions: it washes cookware, cleans the filter device, and transports foreign substances to the sump. The pump and flow paths are designed to perform both washing and filter cleaning operations, eliminating the need for separate cleaning mechanisms and reducing overall system complexity
Solution Approach 2:
The filter cleaning function is merged with the existing washing liquid circulation system. The same pump, spray arms, and flow paths used for washing cookware are also used to clean the filter device and transport debris, consolidating multiple functions into a unified system that reduces component count and simplifies operation
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 automatic cleaning filter effectively reduces flow resistance, improves dishwasher performance, and eliminates the need for manual filter maintenance, leading to energy savings and reduced maintenance costs.
Implementation Method 1
a strong shear force is applied to the inner circumferential surface of the rotating filter, so that foreign substances adhering to the inner circumferential surface of the rotating filter can be easily separated
Data Source
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AI summary
The present disclosure relates to a dishwasher equipped with an automatic cleaning filter includes a tub 12 provided with a washing space 12a that accommodates cooking vessels, a sump 100 disposed under the washing space 12a and configured to store a washing liquid, an automatic cleaning filter 200 disposed in the sump 100, and a washing pump 150 connected to the sump 100 and configured to re-circulate a washing liquid. The automatic cleaning filter 200 includes a rotating filter 210, an inlet guide 220, a filter housing 230, and a driver 270. The rotating filter 210 includes a plurality of first holes 213 and a lateral surface portion 212 surrounding a predetermined vacant space. The inlet guide 220 includes a first outlet 224 which discharges the washing liquid including foreign substances into the rotating filer 210. The filter housing 230 is disposed outside the rotating filter 210, and includes a second outlet 234 configured to discharge a washing liquid, from which foreign substances are filtered by the rotating filter 210. The rotating filter 210 rotates in one direction with respect to the inlet guide 220 and the filter housing 230, and the first outlet 224 is formed toward a part of an inner circumferential surface of the lateral surface portion 212 in a predetermined direction, and a horizontal component of the predetermine direction and a horizontal component of a direction from the first outlet 224 to the second outlet 234 forms a predetermined angle greater than 0 degrees. With the simple configuration, the filter of the dishwasher can be cleaned automatically, effectively and readily without incurring large costs.