Dishwasher and method of controlling the same
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Solution Overview
Problem
Dishwashers often fail to completely remove foreign substances from wash water, leading to recontamination of cleaned items and filter deterioration due to accumulated substances.
Innovation Solution
A dishwasher design that diverts wash water from the spray arm to the interior of a filter, allowing for the collection and discharge of foreign substances, along with a method to measure contamination levels and adjust wash water diversion accordingly, ensuring effective filtration and prevention of recontamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wash water is continuously circulated and sprayed toward objects to be washed, then washing efficiency is maintained, but foreign substances are not completely removed leading to recontamination
Solution Approach 1:
The circulation passage is configured to divert wash water to the filter before the wash water is sprayed back onto the objects. This preliminary filtration action ensures that foreign substances are removed in advance, preventing recontamination while maintaining continuous washing operation
Solution Approach 2:
The circulation passage acts as an intermediary component between the wash water supply system and the spray arm. It intercepts and redirects wash water through the filter, serving as a mediating structure that enables both continuous circulation and effective filtration
2Reliability
If wash water is diverted to the interior of the filter, then foreign substances are effectively removed, but device complexity increases
Solution Approach 1:
The circulation passage is integrated with the existing filter structure, merging the filtration function with the wash water circulation system. This combination allows foreign substance removal without adding completely separate filtration equipment, thereby limiting the increase in device complexity
3Reliability
If foreign substances accumulate on the outer circumferential surface of the filter, then filtration capacity is reduced, but frequent maintenance increases operational time
Solution Approach 1:
The circulation passage enables wash water to flow through the filter interior, creating a self-cleaning effect that removes accumulated foreign substances from the filter's outer surface. This self-maintaining mechanism reduces the need for frequent manual maintenance while preserving filter performance
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
Prevents recontamination of items by ensuring foreign substances are removed with the wash water and minimizes filter blockage by regularly clearing accumulated substances, maintaining sanitation and performance.
Implementation Method 1
a circulation passage configured to divert at least a portion of wash water that is supplied to the spray arm by the wash pump to the sump
Implementation Method 2
a filter for removing foreign substances from the wash water inside the sump
Data Source
AI summary
A dishwasher and a control method thereof are disclosed. The dishwasher includes a tub accommodating an object to be washed, a spray arm rotatably provided inside the tub to spray wash water toward the object to be washed, a sump for storing wash water and collecting wash water sprayed into the tub therein, a filter separably mounted to the sump to remove foreign substances from wash water, a wash pump for supplying wash water stored in the sump to the spray arm, and a circulation passage for diverting at least a portion of the wash water supplied to the spray arm by the wash pump to the sump. After the dishes are washed, all of the wash water introduced into the wash pump is diverted into the filter. Foreign substances present in the wash water are collected in the filter and are discharged outside along with the wash water.