Dish washer and controlling method thereof
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Solution Overview
Problem
Existing dishwashers do not efficiently prevent backflow of water from the sump and do not allow for easy filter replacement or extended filter life by bypassing the filtration process when necessary.
Innovation Solution
A dish washer design featuring a case brake located higher than the sump to prevent backflow and a filter device with a bypass flow path that allows unfiltered water to be supplied to the sump, along with a controller to manage the filtration and bypass operations based on user input or operational needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a filter device is installed inside the cabinet in existing dishwashers, then water can be filtered before entering the sump, but the filter cannot be easily replaced and must be accessed by disassembling the cabinet
Solution Approach 1:
The filter device is segmented into modular components including a filter housing, filter element, and quick-connect interfaces. The housing is divided into separable sections that allow the filter element to be independently removed and replaced without disassembling the entire cabinet or tub structure.
Solution Approach 2:
The filter device is extracted from its traditional hidden position inside the cabinet and repositioned to protrude through the tub bottom into the washing chamber. This extraction makes the filter externally accessible for easy maintenance while maintaining its water filtration function.
2Reliability
If water is always filtered through the filter device, then water quality in the sump is improved, but the filter requires frequent replacement due to clogging and maintenance costs increase
Solution Approach 1:
The system dynamically switches between filtration and bypass modes based on operational requirements. During intensive washing cycles, the bypass valve opens to allow unfiltered water flow, reducing filter loading. During rinsing cycles, filtered water is supplied to enhance cleaning quality. This dynamic operation extends filter life while maintaining water quality when needed.
Solution Approach 2:
The system changes the flow parameter by introducing a bypass pathway that alters water flow distribution. The bypass valve controls the ratio of filtered to unfiltered water entering the sump, allowing optimization between filter protection and water quality based on the washing phase.
3Productivity
If the case brake is positioned at the same level as the sump, then water flow is maximized, but backflow from the sump to the case brake occurs
Solution Approach 1:
The case brake is positioned asymmetrically at a higher elevation than the sump, creating a gravitational head difference. This asymmetric vertical arrangement prevents backflow by ensuring water naturally flows downward from the case brake to the sump, while incorporating an outlet that directs water away from potential backflow paths.
Solution Approach 2:
The elevated position of the case brake creates a gravitational counterbalance against backflow pressure. The height difference generates a downward gravitational force that counteracts any upward backflow tendency from the sump, ensuring unidirectional water flow.
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 design effectively prevents water backflow into the case brake and extends the filter's life cycle by selectively bypassing filtration during operations where purified water is not required, reducing maintenance costs and improving user convenience.
Implementation Method 1
the case brake is located higher than the sump to prevent a backflow of the water collected in the sump to the case brake
Implementation Method 2
a filter device disposed below the tub in the cabinet, to selectively filter or unfilter water received from a water supply source
Data Source
AI summary
A dish washer includes a cabinet, a tub positioned inside the cabinet, a sump provided in a lower portion of the tub, a case brake provided on a side wall of the tub connected to the sump, and a filter device positioned below the tub inside the cabinet, to selectively filter or unfilter water received from a water supply source, and to supply the filtered water or the unfiltered water to the case brake, the water passed through the case brake is collected in the sump, the case brake is located higher than the sump to prevent a backflow of the water collected in the sump to the case brake.