Dishwasher Pump Control for Filter Backwashing and Flow Recovery
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Solution Overview
Problem
Dishwasher filters clog due to accumulated foreign substances, reducing water flow rate and washing performance, and causing offensive odors from decaying debris.
Innovation Solution
A method and apparatus that control the operation of washing and discharging pumps to periodically reverse water flow through the filter, removing trapped foreign substances by adjusting water levels and cycling the pumps on/off to prevent clogging and maintain efficient filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter device continuously filters foreign substances from washing water, then filtration effectiveness is improved, but the filter becomes clogged and water flow rate decreases
Solution Approach 1:
The patent implements periodic backwashing cycles where the discharging pump operates in reverse to flush accumulated foreign substances from the filter. The control part activates the discharging pump at predetermined intervals during the washing cycle, creating periodic cleaning action that prevents filter clogging while maintaining continuous filtration capability.
Solution Approach 2:
The patent reverses the normal water flow direction through the filter by controlling the discharging pump to operate in reverse. Instead of water flowing through the filter in the normal washing direction, the pump pushes water backward through the filter during backwashing, effectively removing accumulated debris and restoring filter permeability.
2Reliability
If foreign substances are continuously stacked on the filter device, then filtration capacity is improved, but resistance against water flow increases and washing performance degrades
Solution Approach 1:
The control part monitors washing cycle progress and automatically triggers backwashing operations based on predetermined timing criteria. This feedback mechanism ensures that filter cleaning is performed at appropriate intervals, preventing excessive debris accumulation that would harm washing performance while maintaining adequate filtration capacity.
Solution Approach 2:
The system performs periodic backwashing at predetermined intervals during the washing cycle, creating regular cleaning cycles that prevent filter degradation. This periodic maintenance ensures filtration capacity is preserved without allowing debris accumulation to interfere with washing performance.
3Reliability
If foreign substances accumulate on the filter device, then initial filtration effectiveness is improved, but offensive odors are generated and reliability decreases
Solution Approach 1:
The system performs preliminary backwashing actions during the washing cycle, before foreign substances have time to decay and generate odors. By proactively flushing the filter at predetermined intervals, the system prevents debris accumulation to harmful levels, eliminating the source of offensive smells before they develop.
Solution Approach 2:
The system converts the potentially harmful accumulation of foreign substances into a beneficial periodic cleaning process. By using the water flow system itself to flush and remove debris, the patent transforms what would be a harmful accumulation into a controlled maintenance operation that prevents odor generation.
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 filter clogging, ensures efficient water flow, and eliminates offensive odors by effectively removing foreign substances, thereby improving washing performance and dishwasher reliability.
Implementation Method 1
a filter part provided to the sump, and filtering a foreign substance from the washing water
Implementation Method 2
a washing water pump disposed at a side of the filter part, and providing driving force to circulate the washing water within the washing chamber and the sump
Data Source
AI summary
Provided is a method of controlling a dishwasher. The dishwasher includes a washing chamber accommodating a dish, a sump storing washing water, and supplying the washing water to the washing chamber, and a filter part provided to the sump, and filtering a foreign substance from the washing water. In the method, a first pump is driven to perform a washing or rinsing process, the first pump is stopped and a second pump is driven for a first set time to perform a discharging process, after the washing or rinsing process, the second pump is stopped and the first pump is driven for a second set time, and the first and second pumps are stopped.